Sel SEL-351S User manual

20080103
SEL-351S Relay
Relay, Meter,
Control, Fault Locator
Instruction Manual
*PM351S-01-NB*

SEL-351S Relay Instruction Manual Date Code 20080103
The relay contains devices sensitive to Electrostatic Discharge
(ESD). When working on the relay with the front panel removed,
work surfaces and personnel must be properly grounded or
equipment damage may result.
!
CAUTION
There is danger of explosion if the battery is incorrectly
replaced. Replace only with Ray-O-Vac®no. BR2335 or
equivalent recommended by manufacturer. Dispose of used
batteries according to the manufacturer’s instructions.
!
CAUTION
Never apply voltage signals greater than 9 V peak-peak to the
low-level test interface (J10) or equipment damage may result.
!
CAUTION
On models with auxiliary trip/close pushbuttons, the front-
panel breaker LED default labeling matches the rear-panel
labeling. If the front-panel breaker LED CLOSED and OPEN labeling
is changed, the front-panel breaker labeling will no longer
match the rear-panel breaker labeling.
!
CAUTION
Removal of relay front panel exposes circuitry which may cause
electrical shock that can result in injury or death.
!
DANGER
Contact with instrument terminals can cause electrical shock
that can result in injury or death.
!
DANGER
This device is shipped with default passwords. Default
passwords should be changed to private passwords at
installation. Failure to change each default password to a
private password may allow unauthorized access. SEL shall not
be responsible for any damage resulting from unauthorized
access.
!
WARNING
SEL-351S Relay features such as Hot Line Tag and Synchronism
Check do not supervise the auxiliary close pushbutton.
!
WARNING
Le relais contient des pièces sensibles aux décharges
électrostatiques. Quand on travaille sur le relais avec les
panneaux avant ou du dessus enlevés, toutes les surfaces et le
personnel doivent être mis à la terre convenablement pour
éviter les dommages à l’équipement.
!
ATTENTION
Il y a un danger d’explosion si la pile électrique n’est pas
correctement remplacée. Utiliser exclusivement Ray-O-Vac®
No. BR2335 ou un équivalent recommandé par le fabricant. Se
débarrasser des piles usagées suivant les instructions du
fabricant.
!
ATTENTION
Au risque de causer des dommages à l’équipement, ne jamais
appliquer un signal de tension supérieur à 9 V crête à crête à
l’interface de test de bas niveau (J10).
!
ATTENTION
Sur les modèles avec bouton-poussoirs auxilaires ouverture/
fermeture, l’étiquette par défaut du voyant lumineux (LED) du
disjoncteur correspond à l’étiquette du panneau arrière. Si
l’étiquette du disjoncteur du panneau avant FERMÉ et OUVERT est
changée, l’étiquette du disjoncteur sur le panneau avant ne
correspondra plus à l’étiquette du disjoncteur sur le panneau
arrière.
!
ATTENTION
Le contact avec les bornes de l’instrument peut causer un choc
électrique pouvant entraîner des blessures ou la mort.
!
DANGER
Tout contact avec les bornes de l’appareil peut causer un choc
électrique pouvant entraîner des blessuers ou la mort.
!
DANGER
Cet appareil est expédié avec des mots de passe par défaut. A
l’installation, les mots de passe par défaut devront être
changés pour des mots de passe confidentiels. Dans le cas
contraire, un accés non-autorisé á l’équipement peut être
possible. SEL décline toute responsabilité pour tout dommage
résultant de cet accés non-autorisé.
!
AVERTISSEMENT
Les caractéristiques du relais SEL-351S telles que le VOYANT
DE LIGNE SOUS-TENSION et la VERIFICATION DE
SYNCHRONISME ne supervisent pas le bouton-poussoir
auxiliaire de fermeture.
!
AVERTISSEMENT
© 1999–2008 by Schweitzer Engineering Laboratories, Inc. All rights reserved.
All brand or product names appearing in this document are the trademark or registered trademark of their respective holders. No SEL
trademarks may be used without written permission. SEL products appearing in this document may be covered by US and Foreign patents.
Schweitzer Engineering Laboratories, Inc. reserves all rights and benefits afforded under federal and international copyright and patent laws in
its products, including without limitation software, firmware, and documentation.
The information in this manual is provided for informational use only and is subject to change without notice. Schweitzer Engineering
Laboratories, Inc. has approved only the English language manual.
This product is covered by the standard SEL 10-year warranty. For warranty details, visit www.selinc.com or contact your customer service
representative. PM351S-01

Date Code 20080103 Instruction Manual SEL-351S Relay
Table of Contents
List of Tables.......................................................................................................................................................................... v
List of Figures...................................................................................................................................................................... ix
Preface.................................................................................................................................................................................... xv
Section 1: Introduction and Specifications
SEL-351S Models ........................................................................................................................................... 1.2
Applications..................................................................................................................................................... 1.5
Hardware Connection Features ....................................................................................................................... 1.6
Communications Connections......................................................................................................................... 1.9
Specifications ................................................................................................................................................ 1.10
Section 2: Installation
Relay Mounting ............................................................................................................................................... 2.1
Front-Panel and Rear-Panel Connection Diagrams......................................................................................... 2.3
User-Configurable Label Option for the Front Panel...................................................................................... 2.9
Making Rear-Panel Connections ................................................................................................................... 2.14
SEL-351S AC/DC Connection Diagrams for Various Applications ............................................................. 2.25
Circuit Board Connections ............................................................................................................................ 2.40
Section 3: Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements
Instantaneous/Definite-Time Overcurrent Elements ....................................................................................... 3.1
Time-Overcurrent Elements .......................................................................................................................... 3.17
Voltage Elements ........................................................................................................................................... 3.28
Synchronism Check Elements....................................................................................................................... 3.36
Frequency Elements ...................................................................................................................................... 3.49
Voltage Sag, Swell, and Interruption Elements (Available in Firmware Version 7) ..................................... 3.54
Power Elements (Available in Firmware Version 7) ..................................................................................... 3.59
Section 4: Loss-of-Potential, Load Encroachment, and Directional Element Logic
Loss-of-Potential Logic ................................................................................................................................... 4.1
Load-Encroachment Logic .............................................................................................................................. 4.4
Directional Control for Neutral Ground and Residual Ground Overcurrent Elements................................... 4.9
Directional Control for Negative-Sequence and Phase Overcurrent Elements ............................................. 4.31
Directional Control Settings.......................................................................................................................... 4.39
Directional Control Provided by Torque Control Settings ............................................................................ 4.58
Section 5: Trip and Target Logic
Trip Logic ........................................................................................................................................................ 5.1
Switch-Onto-Fault (SOTF) Trip Logic............................................................................................................ 5.8
Communications-Assisted Trip Logic—General Overview.......................................................................... 5.11
Permissive Overreaching Transfer Trip (POTT) Logic ................................................................................. 5.15
Directional Comparison Unblocking (DCUB) Logic.................................................................................... 5.21
Directional Comparison Blocking (DCB) Logic........................................................................................... 5.27
Front-Panel Target LEDs............................................................................................................................... 5.32
Section 6: Close and Reclose Logic
Close Logic...................................................................................................................................................... 6.2
Reclose Supervision Logic .............................................................................................................................. 6.7
Reclosing Relay............................................................................................................................................. 6.14

ii
SEL-351S Relay Instruction Manual Date Code 20080103
Table of Contents
Section 7: Inputs, Outputs, Timers, and Other Control Logic
Optoisolated Inputs ..........................................................................................................................................7.2
Local Control Switches....................................................................................................................................7.6
Remote Control Switches ..............................................................................................................................7.10
Latch Control Switches..................................................................................................................................7.12
Multiple Setting Groups.................................................................................................................................7.19
SELOGIC Control Equation Variables/Timers................................................................................................7.28
Output Contacts .............................................................................................................................................7.32
Rotating Default Display ...............................................................................................................................7.36
Section 8: Breaker Monitor, Metering, and Load Profile Functions
Introduction......................................................................................................................................................8.1
Breaker Monitor...............................................................................................................................................8.2
Station DC Battery Monitor...........................................................................................................................8.15
Demand Metering ..........................................................................................................................................8.20
Energy Metering ............................................................................................................................................8.29
Maximum/Minimum Metering ......................................................................................................................8.30
Small Signal Cutoff for Metering ..................................................................................................................8.32
Synchrophasor Metering................................................................................................................................8.33
Load Profile Report (Available in Firmware Versions 6 and 7).....................................................................8.34
Section 9: Setting the Relay
Introduction......................................................................................................................................................9.1
Settings Changes via the Front Panel...............................................................................................................9.3
Settings Changes via the Serial Port ................................................................................................................9.4
Time-Overcurrent Curves ................................................................................................................................9.5
Relay Word Bits (Used in SELOGIC Control Equations)..............................................................................9.27
Settings Explanations.....................................................................................................................................9.48
Settings Sheets ...............................................................................................................................................9.57
Section 10: Serial Port Communications and Commands
Introduction....................................................................................................................................................10.1
Port Connector and Communications Cables ................................................................................................10.2
Communications Protocol..............................................................................................................................10.6
Serial Port Automatic Messages....................................................................................................................10.9
Serial Port Access Levels.............................................................................................................................10.10
Command Summary ....................................................................................................................................10.12
Command Explanations...............................................................................................................................10.14
SEL-351S Relay Command Summary
Section 11: Front-Panel Interface
Introduction....................................................................................................................................................11.1
Front-Panel Pushbutton Operation.................................................................................................................11.2
Functions Unique to the Front-Panel Interface ..............................................................................................11.6
Rotating Default Display .............................................................................................................................11.12
Operator Controls ........................................................................................................................................11.16
Section 12: Standard Event Reports, Sag/Swell/Interruption Report, and SER
Introduction....................................................................................................................................................12.1
Standard 15/30-Cycle Event Reports.............................................................................................................12.2
Sequential Events Recorder (SER) Report ..................................................................................................12.25
Example Standard 15-Cycle Event Report ..................................................................................................12.28
Example SER Report ...................................................................................................................................12.34
Sag/Swell/Interruption (SSI) Report (Available in Firmware Version 7) ....................................................12.36

iii
Date Code 20080103 Instruction Manual SEL-351S Relay
Table of Contents
Section 13: Testing and Troubleshooting
Introduction ................................................................................................................................................... 13.1
Testing Philosophy ........................................................................................................................................ 13.2
Testing Methods and Tools............................................................................................................................ 13.5
Relay Self-Tests............................................................................................................................................. 13.9
Relay Troubleshooting ................................................................................................................................ 13.11
Relay Calibration......................................................................................................................................... 13.13
Factory Assistance....................................................................................................................................... 13.14
Appendix A: Firmware and Manual Versions
Firmware......................................................................................................................................................... A.1
Instruction Manual.......................................................................................................................................... A.6
Appendix B: SEL-300 Series Relays Firmware Upgrade Instructions
Overview .........................................................................................................................................................B.1
Relay Firmware Upgrade Instructions.............................................................................................................B.1
Ethernet Port Firmware Upgrade Instructions...............................................................................................B.18
Appendix C: SEL Distributed Port Switch Protocol
Settings ............................................................................................................................................................C.2
Operation .........................................................................................................................................................C.3
Appendix D: Configuration, Fast Meter, and Fast Operate Commands
Overview ........................................................................................................................................................ D.1
Message Lists ................................................................................................................................................. D.2
Message Definitions ....................................................................................................................................... D.3
Appendix E: Compressed ASCII Commands
CASCII Command—General Format .............................................................................................................E.2
CASCII Command—SEL-351S......................................................................................................................E.4
CSTATUS Command—SEL-351S..................................................................................................................E.5
CHISTORY Command—SEL-351S ...............................................................................................................E.6
CEVENT Command—SEL-351S...................................................................................................................E.7
Appendix F: Setting Negative-Sequence Overcurrent Elements
Setting Negative-Sequence Definite-Time Overcurrent Elements .................................................................. F.1
Setting Negative-Sequence Time-Overcurrent Elements ................................................................................ F.2
Coordinating Negative-Sequence Overcurrent Elements................................................................................ F.3
Other Negative-Sequence Overcurrent Element References........................................................................... F.7
Appendix G: Setting SELOGIC Control Equations
Relay Word Bits.............................................................................................................................................. G.2
SELOGIC Control Equations........................................................................................................................... G.5
Processing Order and Processing Interval.................................................................................................... G.13
Appendix H: Distributed Network Protocol
Overview ........................................................................................................................................................ H.1
Configuration.................................................................................................................................................. H.2
EIA-232 Physical Layer Operation ................................................................................................................ H.4
Data-Link Operation....................................................................................................................................... H.5
Data Access Method....................................................................................................................................... H.6
Device Profile ................................................................................................................................................. H.7
Object Table.................................................................................................................................................... H.9
Data Map ...................................................................................................................................................... H.14
Point Remapping .......................................................................................................................................... H.20

iv
SEL-351S Relay Instruction Manual Date Code 20080103
Table of Contents
Appendix I: MIRRORED BITS Communications (In Firmware Versions 6 and 7)
Overview.......................................................................................................................................................... I.1
Operation ......................................................................................................................................................... I.3
MIRRORED BITS Protocol for the Pulsar 9600 Baud Modem .......................................................................... I.6
Settings............................................................................................................................................................. I.7
Appendix J: SEL-351S Fast SER Protocol
Introduction...................................................................................................................................................... J.1
Make Sequential Events Recorder (SER) Settings With Care......................................................................... J.2
Recommended Message Usage ....................................................................................................................... J.3
Functions and Function Codes......................................................................................................................... J.4
Appendix K: ACSELERATOR QuickSet SEL-5030 Software
Introduction.....................................................................................................................................................K.1
ACSELERATOR QuickSet System Requirements ............................................................................................K.2
Installation ......................................................................................................................................................K.3
Starting ACSELERATOR QuickSet...................................................................................................................K.4
Appendix L: SEL Synchrophasors
Overview......................................................................................................................................................... L.1
Introduction..................................................................................................................................................... L.2
Synchrophasor Measurement.......................................................................................................................... L.3
External Equipment Compensation ................................................................................................................ L.4
Protocol Operation.......................................................................................................................................... L.5
Settings............................................................................................................................................................ L.8
Synchrophasor Relay Word Bits ................................................................................................................... L.11
View Synchrophasors by Using the MET PM Command ............................................................................ L.12
Communications Bandwidth......................................................................................................................... L.14
SEL-351S Relay Command Summary

Date Code 20080103 Instruction Manual SEL-351S Relay
List of Tables
Table 1.1 SEL-351S Models .................................................................................................................. 1.2
Table 1.2 SEL-351S Firmware Versions................................................................................................ 1.3
Table 2.1 Options and Explanations for the User-Configurable Front-Panel Labels........................... 2.13
Table 2.2 Communication Cables to Connect the SEL-351S to Other Devices .................................. 2.24
Table 2.3 Output Contact Jumpers and Corresponding Output Contacts ............................................ 2.45
Table 2.4 “Extra Alarm” Output Contacts and Corresponding Controlling Jumpers .......................... 2.45
Table 2.5 Required Position of Jumper JMP23 for Desired Output Contact OUT107 Operation
(Models 0351Sx1, and 0351SxY) .................................................................................... 2.45
Table 2.6 Password and Breaker Jumper Positions for Standard Relay Shipments............................. 2.46
Table 2.7 Password and Breaker Jumper Operation ............................................................................ 2.46
Table 2.8 EIA-232 Serial Port Voltage Jumper Positions for Standard Relay Shipments ................... 2.46
Table 2.9 Jumper Positions for Breaker OPEN/CLOSE Indication..................................................... 2.47
Table 2.10 Jumper Positions for Arc Suppression ................................................................................. 2.47
Table 3.1 Available Phase Time-Overcurrent Elements....................................................................... 3.17
Table 3.2 Phase Time-Overcurrent Elements Settings......................................................................... 3.17
Table 3.3 Phase Time-Overcurrent Element (maximum phase) Logic Outputs .................................. 3.19
Table 3.4 Neutral Ground Time-Overcurrent Elements Settings......................................................... 3.23
Table 3.5 Residual Ground Time-Overcurrent Elements Settings....................................................... 3.25
Table 3.6 Negative-Sequence Time-Overcurrent Elements Settings .................................................. 3.26
Table 3.7 Voltage Values Used by Voltage Elements........................................................................... 3.28
Table 3.8 Voltage Elements Settings and Settings Ranges (Wye-Connected PTs).............................. 3.29
Table 3.9 Voltage Elements Settings and Settings Ranges (VS Channel) ........................................... 3.29
Table 3.10 Voltage Elements Settings and Settings Ranges (Delta-Connected PTs)............................. 3.30
Table 3.11 Synchronism Check Elements Settings and Settings Ranges .............................................. 3.36
Table 3.12 Frequency Elements Settings and Settings Ranges.............................................................. 3.51
Table 3.13 Sag/Swell/Interruption Elements Settings (must first set ESSI = Y).................................. 3.56
Table 3.14 Single-Phase Power Element Settings and Setting Ranges (EPWR = 1, 2, 3, or 4) ........... 3.59
Table 3.15 Three-Phase Power Element Settings and Setting Ranges
(EPWR = 3P1, 3P2, 3P3, or 3P4) ..................................................................................... 3.59
Table 4.1 LOP Logic Inputs................................................................................................................... 4.1
Table 4.2 Load-Encroachment Settings Ranges..................................................................................... 4.5
Table 4.3 Available Ground Directional Elements............................................................................... 4.11
Table 4.4 Best Choice Ground Directional™ Logic............................................................................ 4.11
Table 4.5 Ground Directional Element Availability by Voltage Connection Settings ......................... 4.13
Table 4.6 Directional Control Settings Not Made for Particular Conditions....................................... 4.40
Table 4.7 Overcurrent Elements Controlled by Level Direction Settings DIR1–DIR4
(Corresponding Overcurrent Element Figure Numbers in Parentheses............................ 4.40
Table 4.8 z Constant for Z2R Setting................................................................................................... 4.43
Table 4.9 z Constant for Z0R Setting................................................................................................... 4.48
Table 4.10 Affect of Global Settings VSCONN and PTCONN on Petersen Coil Directional
Elements ........................................................................................................................... 4.56
Table 5.1 SEL-351S Front-Panel Target LED Definitions and Settings .............................................. 5.32
Table 6.1 Relay Word Bit and Front-Panel Correspondence to Reclosing Relay States ..................... 6.15
Table 6.2 Reclosing Relay Timer Settings and Setting Ranges ........................................................... 6.17
Table 6.3 Shot Counter Correspondence to Relay Word Bits and Open-interval Times ..................... 6.20
Table 6.4 Reclosing Relay SELOGIC Control Equation Settings ......................................................... 6.21
Table 6.5 Example Open-Interval Time Settings ................................................................................. 6.25
Table 7.1 Correspondence Between Local Control Switch Positions and Label Settings..................... 7.6
Table 7.2 Correspondence Between Local Control Switch Types and Required Label Settings........... 7.7
Table 7.3 Definitions for Active Setting Group Indication Relay Word Bits SG1–SG6 ..................... 7.19
Table 7.4 Definitions for Active Setting Group Switching SELOGIC Control Equation
Settings SS1–SS6 ............................................................................................................. 7.19
Table 7.5 SELOGIC Control Equation Settings for Switching Active Setting Group Between Setting
Groups 1 and 4..................................................................................................................7.21

vi
SEL-351S Relay Instruction Manual Date Code 20080103
List of Tables
Table 7.6 Active Setting Group Switching Input Logic .......................................................................7.23
Table 7.7 SELOGIC Control Equation Settings for Rotating Selector Switch Active Setting Group
Switching ..........................................................................................................................7.24
Table 7.8 Mnemonic Settings for Metering on the Rotating Default Display......................................7.43
Table 7.9 Mnemonic Settings for Breaker Wear Monitor Values on the Rotating Default Display.....7.47
Table 7.10 Mnemonic Settings for Time-Overcurrent (TOC) Element Pickups on the Rotating Default
Display ..............................................................................................................................7.49
Table 7.11 Mnemonic Settings for Time-Overcurrent (TOC) Element Pickups Using the
Same-Line-Label Format on the Rotating Default Display ..............................................7.49
Table 8.1 Breaker Maintenance Information for a 25 kV Circuit Breaker.............................................8.2
Table 8.2 Breaker Monitor Settings and Settings Ranges ......................................................................8.3
Table 8.3 Demand Meter Settings and Settings Range ........................................................................8.24
Table 8.4 Operation of Maximum/Minimum Metering With Directional Power Quantities ...............8.30
Table 8.5 Metering Thresholds (Secondary Units)...............................................................................8.32
Table 9.1 Serial Port SET Commands....................................................................................................9.1
Table 9.2 Set Command Editing Keystrokes..........................................................................................9.4
Table 9.3 Equations Associated with U.S. Curves .................................................................................9.5
Table 9.4 Equations Associated with IEC Curves..................................................................................9.5
Table 9.5 Recloser Curve Designations..................................................................................................9.6
Table 9.6 SEL-351S Relay Word Bits ..................................................................................................9.27
Table 9.7 Relay Word Bit Definitions for SEL-351S ...........................................................................9.29
Table 9.8 Main Relay Functions That Change With VSCONN, When PTCONN = WYE ................9.51
Table 9.9 Main Relay Functions That Change With VSCONN, When PTCONN = DELTA.............9.52
Table 9.10 Main Relay Functions That Change With VNOM = OFF....................................................9.53
Table 10.1 Pinout Functions for EIA-232 Serial Ports 2, 3, and F.........................................................10.2
Table 10.2 Terminal Functions for EIA-485 Serial Port 1 .....................................................................10.2
Table 10.3 Serial Communications Port Pin/Terminal Function Definitions.........................................10.4
Table 10.4 Serial Port Automatic Messages...........................................................................................10.9
Table 10.5 Serial Port Command Summary .........................................................................................10.12
Table 10.6 SEL-351S Word and Its Correspondence to TAR Command.............................................10.35
Table 10.7 SEL-351S Control Subcommand .......................................................................................10.41
Table 10.8 Factory Default Passwords for Access Levels 1, B, and 2 .................................................10.42
Table 10.9 Valid Password Characters .................................................................................................10.43
Table 11.1 SEL-351S Front-Panel Operator Control Functions...........................................................11.16
Table 12.1 Event Types...........................................................................................................................12.4
Table 12.2 Standard Event Report Current, Voltage, and Frequency Columns .....................................12.9
Table 12.3 Output, Input, and Protection, and Control Element Event Report Columns.....................12.10
Table 12.4 SSI Element Status Columns..............................................................................................12.37
Table 12.5 Status SSI Column..............................................................................................................12.37
Table 13.1 Resultant Scale Factors for Input Module ............................................................................13.6
Table 13.2 Relay Self-Tests ....................................................................................................................13.9
Table A.1 Firmware Revision History....................................................................................................A.1
Table A.2 Instruction Manual Revision History.....................................................................................A.6
Table B.1 Troubleshooting New Firmware Upload ............................................................................. B.13
Table D.1 Binary Message List ..............................................................................................................D.2
Table D.2 ASCII Configuration Message List .......................................................................................D.2
Table D.3 A5CO Relay Definition Block...............................................................................................D.3
Table D.4 A5C1 Fast Meter Configuration Block..................................................................................D.3
Table D.5 A5D1 Fast Meter Data Block ................................................................................................D.5
Table D.6 A5C2/A5C3 Demand/Peak Demand Fast Meter Configuration Messages...........................D.5
Table D.7 A5D2/A5D3 Demand/Peak Demand Fast Meter Message ...................................................D.8
Table D.8 A5CE Fast Operate Configuration Block ..............................................................................D.8
Table D.9 AFE0 Fast Operate Remote Bit Control..............................................................................D.10
Table D.10 A5E3 Fast Operate Breaker Control....................................................................................D.11
Table D.11 A5CD Fast Operate Reset Definition Block........................................................................D.11
Table D.12 A5ED Fast Operate Reset Command ..................................................................................D.12
Table G.1 Logic Outputs of the Phase Time-Overcurrent Element .......................................................G.2
Table G.2 Common Uses for Relay Word bits 51P1, 51P1T, and 51P1R..............................................G.3

vii
Date Code 20080103 Instruction Manual SEL-351S Relay
List of Tables
Table G.3 SELOGIC Control Equation Operators (Listed in Processing Order) .................................... G.5
Table G.4 Relay Word Bits in Factory Setting Example ....................................................................... G.7
Table G.5 SELOGIC Control Equation Settings Limitations................................................................ G.12
Table G.6 Processing Order of Relay Elements and Logic (Top to Bottom)....................................... G.13
Table G.7 Asynchronous Processing Order of Relay Elements........................................................... G.15
Table H.1 Port Settings for Standard Mode DNP Operation ................................................................. H.2
Table H.2 Port Settings for Extended Mode DNP Operation ................................................................ H.2
Table H.3 Data Access Methods............................................................................................................ H.6
Table H.4 SEL-351S DNP3 Device Profile ........................................................................................... H.7
Table H.5 SEL-351S DNP Object Table................................................................................................ H.9
Table H.6 SEL-351S DNP Data Map .................................................................................................. H.14
Table H.7 Analog 105 Upper Byte Definitions.................................................................................... H.17
Table H.8 Analog 105 Lower Byte Definitions ................................................................................... H.17
Table H.9 Control Field ....................................................................................................................... H.17
Table I.1 MIRRORED BITS.......................................................................................................................I.1
Table I.2 Error Types Reported by the Communications Report ...........................................................I.4
Table I.3 SPEED Setting and MIRRORED BITS Messages......................................................................I.7
Table I.4 Example Three-Terminal MIRRORED BITS ID Setup ..............................................................I.8
Table J.1 Function Code 01 Message Format.........................................................................................J.4
Table J.2 02 Function Code Message Format.........................................................................................J.5
Table J.3 Function Code 18 Message Format.........................................................................................J.5
Table J.4 Message Format for Lost SER Records ..................................................................................J.6
Table J.5 Acknowledge Message Format ...............................................................................................J.7
Table J.6 Supported Response Codes .....................................................................................................J.7
Table L.1 SEL Fast Message Protocol Format .......................................................................................L.5
Table L.2 Unsolicited Fast Message Enable Packet ...............................................................................L.6
Table L.3 Unsolicited Fast Message Disable Packet ..............................................................................L.6
Table L.4 Permissible Message Periods Requested by Enable Message ...............................................L.7
Table L.5 SEL-351S Global Settings for Synchrophasors .....................................................................L.8
Table L.6 SEL-351S Serial Port Settings for Synchrophasors ...............................................................L.8
Table L.7 Time Synchronization Relay Word Bits...............................................................................L.11
Table L.8 SEL Fast Message Voltage and Current Selections Based on PHDATAV and PHDATAI...L.14

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Date Code 20080103 Instruction Manual SEL-351S Relay
List of Figures
Figure 1.1 SEL-351S Relays Applied Throughout the Power System.................................................... 1.5
Figure 1.2 Inputs, Outputs, and Communications Ports
(Extra I/O Boards in Figure 1.3 and Figure 1.4) ................................................................ 1.6
Figure 1.3 Extra I/O Board (Model 0351SxY, Plug-In Connector Version; Main Board Shown in
Figure 1.2) .......................................................................................................................... 1.7
Figure 1.4 Extra I/O Board (Model 0351Sx1, Screw-Terminal Block Version; Main Board Shown in
Figure 1.2) .......................................................................................................................... 1.8
Figure 1.5 Communications Connections Examples............................................................................... 1.9
Figure 2.1 SEL-351S Dimensions for Rack-Mount and Panel-Mount Models....................................... 2.2
Figure 2.2 SEL-351S Front- and Rear-Panel Drawings (Model 0351SxYH3xxxx6x); Horizontal Rack
Mount Example, (Connectorized, With Additional I/O Board) ......................................... 2.4
Figure 2.3 SEL-351S Front- and Rear-Panel Drawings (Model 0351Sx133xxxx2x); Horizontal Panel
Mount Example, (Conventional Terminal Blocks, With Additional I/O Board) ............... 2.5
Figure 2.4 SEL-351S Front- and Rear-Panel Drawings (Model 0351Sx143xxxxXx); Vertical Panel
Mount Example, (Conventional Terminal Blocks, No Additional I/O Board) .................. 2.6
Figure 2.5 SEL-351S with Auxiliary {TRIP}/{CLOSE} Pushbuttons (Model 0351Sx145xxxx6x); Vertical
Panel-Mount Example, (Conventional Terminal Blocks, With Additional I/O Board)..... 2.7
Figure 2.6 SEL-351S with Auxiliary {TRIP}/{CLOSE} Pushbuttons (Model 0351SxYH5xxxx2x);
Horizontal Rack-Mount Example, (Connectorized, With Additional I/O Board).............. 2.8
Figure 2.7 SEL-351S (Horizontal) With User-Configurable Default Labels.......................................... 2.9
Figure 2.8 SEL-351S (Horizontal) Blank Slide-In Label Set and Label Removal Tool ....................... 2.10
Figure 2.9 SEL-351S (Vertical) With User-Configurable Default Labels............................................ 2.11
Figure 2.10 SEL-351S (Vertical) Blank Slide-In Label Set and Label Removal Tool ............................ 2.12
Figure 2.11 Breaker LED Front-Panel Default Labels and Rear-Panel Labels ....................................... 2.13
Figure 2.12 SEL-351S Plug-In Connector Coding (Top View; Model 0351SxY).................................. 2.15
Figure 2.13 Broken-Delta Secondary Connection to Voltage Input VS, Wye-Connected PTs ............... 2.21
Figure 2.14 Resultant Voltage VSFrom the Collapse of Voltage VAin the Broken-Delta Secondary
(Compared to the Wye-Connected Power System Voltages............................................. 2.22
Figure 2.15 Broken-Delta Secondary Connection to Voltage Input VS, Open-Delta Connected PTs.... 2.22
Figure 2.16 Resultant Voltage VS From the Collapse of Voltage VAin the Broken-Delta Secondary
(Compared to the Open-Delta Connected Power System Voltages)................................. 2.23
Figure 2.17 SEL-351S Provides Overcurrent Protection and Reclosing for a Utility Distribution Feeder
(Includes Fast Bus Trip Scheme) (Wye-Connected PTs)................................................. 2.25
Figure 2.18 SEL-351S Provides Overcurrent Protection for a Distribution Bus
(Includes Fast Bus Trip Scheme) (Wye-Connected PTs)................................................. 2.26
Figure 2.19 SEL-351S Provides Directional Overcurrent Protection and Reclosing for a
Transmission Line (Wye-Connected PTs) ....................................................................... 2.27
Figure 2.20 SEL-351S Provides Directional Overcurrent Protection and Reclosing for a Transmission
Line (Current-Polarization Source Connected to Channel IN) (Wye-Connected PTs).... 2.28
Figure 2.21 SEL-351S Provides Overcurrent Protection for a Delta-Wye Transformer Bank
(Wye-Connected PTs) ...................................................................................................... 2.29
Figure 2.22 SEL-351S Provides Overcurrent Protection for a Transformer Bank With a Tertiary
Winding (Wye-Connected PTs) ....................................................................................... 2.30
Figure 2.23 SEL-351S Provides Overcurrent Protection for an Industrial Distribution Feeder
(Core-Balance Current Transformer Connected to Channel IN)...................................... 2.31
Figure 2.24 SEL-351S Provides Dedicated Breaker Failure Protection.................................................. 2.32
Figure 2.25 SEL-351S Provides Overcurrent Protection for a High-Impedance or Low-Impedance
Grounded System (Wye-Connected PTs)......................................................................... 2.33
Figure 2.26 SEL-351S Provides Overcurrent Protection for a Petersen Coil Grounded System
(Wye-Connected PTs) ...................................................................................................... 2.34
Figure 2.27 SEL-351S Provides Overcurrent Protection for an Ungrounded System
(Wye-Connected PTs) ...................................................................................................... 2.35
Figure 2.28 SEL-351S Provides Overcurrent Protection for an Ungrounded System
(Open-Delta Connected PTs, Broken-Delta 3V0 Connection)......................................... 2.36

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SEL-351S Relay Instruction Manual Date Code 20080103
List of Figures
Figure 2.29 SEL-351S Provides Overcurrent Protection and Reclosing for a Utility Distribution Feeder
(Open-Delta Connected PTs and Line-to-Ground Synch-Check Connection).................2.37
Figure 2.30 SEL-351S Provides Underfrequency Load Shedding, Overcurrent Protection, and
Reclosing for a Utility Distribution Feeder (Single Voltage Connection)........................2.38
Figure 2.31 SEL-351S Example Wiring Diagram Using the Auxiliary {TRIP}/{CLOSE}
Pushbuttons for 0351Sxxx5/6/A/B Models ......................................................................2.39
Figure 2.32 Jumper, Connector, and Major Component Locations on the SEL-351S Main Board ........2.41
Figure 2.33 Jumper, Connector, and Major Component Locations on the SEL-351SxY Extra
I/O Board (Plug-In Connector Version) ............................................................................2.42
Figure 2.34 Jumper, Connector, and Major Component Locations on the SEL-351Sx1 Extra
I/O Board (Screw Terminal Block Version)......................................................................2.43
Figure 2.35 Jumper Locations for the 0351Sxxx5/6/A/B Model Magnetics/Auxiliary Pushbutton
Board.................................................................................................................................2.44
Figure 3.1 Levels 1–4 Phase Instantaneous Overcurrent Elements .........................................................3.2
Figure 3.2 Levels 5–6 Phase Instantaneous Overcurrent Elements .........................................................3.2
Figure 3.3 Levels 1–4 Phase Instantaneous/Definite-Time Overcurrent Elements
(With Directional Control Option)......................................................................................3.4
Figure 3.4 Combined Single-Phase Instantaneous Overcurrent Elements...............................................3.6
Figure 3.5 SEL-351S Nondirectional Instantaneous Overcurrent Element Pickup Time Curve.............3.7
Figure 3.6 SEL-351S Nondirectional Instantaneous Overcurrent Element Reset Time Curve ...............3.7
Figure 3.7 Levels 1–4 Phase-to-Phase Instantaneous Overcurrent Elements ..........................................3.9
Figure 3.8 Levels 1–4 Neutral Ground Instantaneous/Definite-Time Overcurrent Elements
(With Directional Control Option)....................................................................................3.10
Figure 3.9 Levels 5–6 Neutral Ground Instantaneous Overcurrent Elements .......................................3.11
Figure 3.10 Levels 1–4 Residual Ground Instantaneous/Definite-Time Overcurrent Elements
(With Directional Control Option)....................................................................................3.13
Figure 3.11 Levels 5–6 Residual Ground Instantaneous Overcurrent Elements .....................................3.14
Figure 3.12 Levels 1–4 Negative-Sequence Instantaneous/Definite-Time Overcurrent Elements
(With Directional Control Option)....................................................................................3.15
Figure 3.13 Levels 5–6 Negative-Sequence Instantaneous Overcurrent Elements..................................3.16
Figure 3.14 Phase Time-Overcurrent Element 51P1T (With Directional Control Option) .....................3.18
Figure 3.15 Phase Time-Overcurrent Element 51P2T (With Directional Control Option) .....................3.18
Figure 3.16 Neutral Ground Time-Overcurrent Element 51N1T (With Directional Control Option).....3.22
Figure 3.17 Neutral Ground Time-Overcurrent Element 51N2T (With Directional Control Option).....3.23
Figure 3.18 Residual Ground Time-Overcurrent Element 51G1T (With Directional Control Option)...3.24
Figure 3.19 Residual Ground Time-Overcurrent Element 51G2T (With Directional Control Option)...3.25
Figure 3.20 Negative-Sequence Time-Overcurrent Element 51QT (with Directional Control Option)..3.26
Figure 3.21 Single-Phase and Three-Phase Voltage Elements (Wye-Connected PTs) ...........................3.31
Figure 3.22 Phase-to-Phase and Sequence Voltage Elements (Wye-Connected PTs) .............................3.32
Figure 3.23 Phase-to-Phase Voltage Elements (Delta-Connected PTs)...................................................3.33
Figure 3.24 Sequence Voltage Elements (Delta-Connected PTs)............................................................3.33
Figure 3.25 Channel VS Voltage Elements (Wye- or Delta-Connected PTs)..........................................3.34
Figure 3.26 Synchronism Check Voltage Window and Slip Frequency Elements .................................3.38
Figure 3.27 Synchronism Check Elements ..............................................................................................3.39
Figure 3.28 Angle Difference Between VPand VSCompensated by Breaker Close Time
(fP<f
Sand VPShown as Reference in This Example) ....................................................3.45
Figure 3.29 Undervoltage Block for Frequency Elements (Group Setting VNOM ¼ OFF)...................3.49
Figure 3.30 Undervoltage Block for Frequency Elements (Group Setting VNOM = OFF)....................3.49
Figure 3.31 Levels 1–6 Frequency Elements...........................................................................................3.50
Figure 3.32 Voltage Sag Elements ...........................................................................................................3.54
Figure 3.33 Voltage Swell Elements ........................................................................................................3.55
Figure 3.34 Voltage Interruption Elements ..............................................................................................3.55
Figure 3.35 Vbase Tracking Example (Three-Phase Disturbance, Wye Connected) .............................3.57
Figure 3.36 Single-Phase Power Elements Logic (+VARS Example Shown).........................................3.62
Figure 3.37 Three-Phase Power Elements Logic.....................................................................................3.63
Figure 3.38 Power Elements Operation in the Real/Reactive Power Plane.............................................3.63
Figure 3.39 SEL-351S(B) Provides VAR Control for 9600 kVAR Capacitor Bank................................3.64
Figure 3.40 Per Unit Setting Limits for Switching 9600 kVAR Capacitor Bank On- and Off-Line .......3.66

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Date Code 20080103 Instruction Manual SEL-351S Relay
List of Figures
Figure 4.1 Loss-of-Potential Logic.......................................................................................................... 4.1
Figure 4.2 Load-Encroachment Logic..................................................................................................... 4.4
Figure 4.3 Migration of Apparent Positive-Sequence Impedance for a Fault Condition ........................ 4.7
Figure 4.4 General Logic Flow of Directional Control for Neutral Ground and Residual Ground
Overcurrent Elements (Excluding Ungrounded/High-Impedance Grounded Systems)... 4.10
Figure 4.5 General Logic Flow of Directional Control for Neutral Ground and Residual Ground
Overcurrent Elements (Ungrounded/High-Impedance Grounded Systems;
ORDER = U) .................................................................................................................... 4.11
Figure 4.6 Internal Enables (32QE and 32QGE) Logic for Negative-Sequence Voltage-Polarized
Directional Elements ........................................................................................................ 4.19
Figure 4.7 Internal Enables (32VE and 32IE) Logic for Zero-Sequence Voltage-Polarized and Channel
IN Current-Polarized Directional Elements ..................................................................... 4.20
Figure 4.8 Internal Enable (32NE) Logic for Zero-Sequence Voltage-Polarized Directional Elements
(Low-Impedance Grounded, Petersen Coil Grounded, and Ungrounded/High-Impedance
Grounded Systems)........................................................................................................... 4.21
Figure 4.9 Negative-Sequence Voltage-Polarized Directional Element for Neutral Ground and Residual
Ground Overcurrent Elements.......................................................................................... 4.22
Figure 4.10 Zero-Sequence Voltage-Polarized Directional Element....................................................... 4.23
Figure 4.11 Channel IN Current-Polarized Directional Element ............................................................ 4.24
Figure 4.12 Zero-Sequence Voltage-Polarized Directional Element (Low-Impedance Grounded
Systems)............................................................................................................................ 4.25
Figure 4.13 Wattmetric and Incremental Conductance Directional Elements (Petersen Coil Grounded
Systems)............................................................................................................................ 4.26
Figure 4.14 Zero-Sequence Voltage-Polarized Directional Element (Ungrounded/High-Impedance
Grounded Systems)........................................................................................................... 4.27
Figure 4.15 Routing of Directional Elements to Residual Ground Overcurrent Elements ..................... 4.28
Figure 4.16 Routing of Direction Elements to Neutral Ground Overcurrent Elements .......................... 4.28
Figure 4.17 Direction Forward/Reverse Logic for Residual Ground Overcurrent Elements .................. 4.29
Figure 4.18 Direction Forward/Reverse Logic for Neutral Ground Overcurrent Elements .................... 4.30
Figure 4.19 General Logic Flow of Directional Control for Negative-Sequence and Phase
Overcurrent Elements ....................................................................................................... 4.31
Figure 4.20 Negative-Sequence Voltage-Polarized Directional Element for Negative-Sequence and
Phase Overcurrent Elements............................................................................................. 4.34
Figure 4.21 Positive-Sequence Voltage-Polarized Directional Element for Phase Overcurrent
Elements ........................................................................................................................... 4.35
Figure 4.22 Routing of Directional Elements to Negative-Sequence and Phase Overcurrent Elements. 4.36
Figure 4.23 Direction Forward/Reverse Logic for Negative-Sequence Overcurrent Elements .............. 4.37
Figure 4.24 Direction Forward/Reverse Logic for Phase Overcurrent Elements .................................... 4.38
Figure 4.25 Zero-Sequence Impedance Network and Relay Polarity ..................................................... 4.49
Figure 4.26 Zero-Sequence Impedance Plot for Solidly-Grounded, Mostly Inductive System .............. 4.49
Figure 4.27 Zero-Sequence Impedance Network for Ground Fault on Feeder 1 .................................... 4.52
Figure 4.28 Wattmetric Element Operation for Ground Fault on Feeder 1............................................. 4.53
Figure 5.1 Trip Logic............................................................................................................................... 5.2
Figure 5.2 Minimum Trip Duration Timer Operation (See Bottom of Figure 5.1) ................................. 5.3
Figure 5.3 Three-Pole Open Logic (Top) and Switch-Onto-Fault Logic (Bottom)................................. 5.8
Figure 5.4 Communications-Assisted Tripping Scheme ....................................................................... 5.11
Figure 5.5 Permissive Input Logic Routing to POTT Logic.................................................................. 5.16
Figure 5.6 POTT Logic.......................................................................................................................... 5.18
Figure 5.7 Permissive Input Logic Routing to Trip Logic..................................................................... 5.19
Figure 5.8 SEL-351S Connections to Communications Equipment for a Two-Terminal Line POTT
Scheme.............................................................................................................................. 5.20
Figure 5.9 SEL-351S Connections to Communications Equipment for a Three-Terminal Line POTT
Scheme.............................................................................................................................. 5.20
Figure 5.10 DCUB Logic ........................................................................................................................ 5.24
Figure 5.11 Unblocking Block Logic Routing to Trip Logic .................................................................. 5.25
Figure 5.12 SEL-351S Connections to Communications Equipment for a Two-Terminal Line DCUB
Scheme (Setting ECOMM = DCUB1) ............................................................................. 5.25

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SEL-351S Relay Instruction Manual Date Code 20080103
List of Figures
Figure 5.13 SEL-351S Connections to Communications Equipment for a Three-Terminal Line DCUB
Scheme (Setting ECOMM = DCUB2)..............................................................................5.26
Figure 5.14 DCB Logic............................................................................................................................5.29
Figure 5.15 SEL-351S Connections to Communications Equipment for a Two-Terminal Line DCB
Scheme ..............................................................................................................................5.30
Figure 5.16 SEL-351S Connections to Communications Equipment for a Three-Terminal Line DCB
Scheme ..............................................................................................................................5.31
Figure 5.17 Programmable Front-Panel Target LED Logic.....................................................................5.33
Figure 5.18 Seal-in of Breaker Failure Occurrence for Message Display ...............................................5.36
Figure 6.1 Close Logic.............................................................................................................................6.2
Figure 6.2 Close Conditions—Other Than Auto-Reclosing....................................................................6.4
Figure 6.3 Unlatch Close Conditions.......................................................................................................6.5
Figure 6.4 Breaker Status Determination.................................................................................................6.6
Figure 6.5 Reclose Supervision Logic (Following Open-interval Time-Out) .........................................6.7
Figure 6.6 Reclose Supervision Limit Timer Operation (Refer to Bottom of Figure 6.5).......................6.8
Figure 6.7 SEL-351S Relays Installed at Both Ends of a Transmission Line in a High-Speed Reclose
Scheme ..............................................................................................................................6.11
Figure 6.8 Reclosing Relay States and General Operation ....................................................................6.15
Figure 6.9 Example Reclosing Sequence From Reset to Lockout.........................................................6.18
Figure 6.10 Factory-Default Drive-to-Lockout Logic .............................................................................6.24
Figure 6.11 Reclose Blocking for Islanded Generator.............................................................................6.26
Figure 6.12 Sequence Coordination Between the SEL-351S and a Line Recloser .................................6.29
Figure 6.13 Operation of SEL-351S Shot Counter for Sequence Coordination With Line Recloser
(Additional Settings Example 1).......................................................................................6.29
Figure 6.14 Operation of SEL-351S Shot Counter for Sequence Coordination With Line Recloser
(Additional Settings Example 2).......................................................................................6.31
Figure 7.1 Example Operation of Optoisolated Inputs IN101–IN106.....................................................7.2
Figure 7.2 Example Operation of Optoisolated Inputs IN201–IN208—Extra I/O Board.......................7.3
Figure 7.3 Circuit Breaker Auxiliary Contact and Reclose Enable Switch Connected to Optoisolated
Inputs IN101 and IN102 .....................................................................................................7.4
Figure 7.4 Local Control Switches Drive Local Bits LB1–LB16............................................................7.6
Figure 7.5 Local Control Switch Configured as an ON/OFF Switch ......................................................7.7
Figure 7.6 Local Control Switch Configured as an OFF/MOMENTARY Switch ..................................7.7
Figure 7.7 Local Control Switch Configured as an ON/OFF/MOMENTARY Switch............................7.7
Figure 7.8 Configured Manual Trip Switch Drives Local Bit LB3 .........................................................7.8
Figure 7.9 Configured Manual Close Switch Drives Local Bit LB4 .......................................................7.8
Figure 7.10 Remote Control Switches Drive Remote Bits RB1–RB16...................................................7.10
Figure 7.11 Traditional Latching Relay ...................................................................................................7.12
Figure 7.12 Latch Control Switches Drive Latch Bits LT1–LT16...........................................................7.12
Figure 7.13 SCADA Contact Pulses Input IN104 to Enable/Disable Reclosing Relay...........................7.13
Figure 7.14 Latch Control Switch Controlled by a Single Input to Enable/Disable Reclosing...............7.13
Figure 7.15 Latch Control Switch Operation Time Line .........................................................................7.15
Figure 7.16 Time Line for Reset of Latch Bit LT2 After Active Setting Group Change.........................7.16
Figure 7.17 Latch Control Switch (With Time Delay Feedback) Controlled by a Single Input to
Enable/Disable Reclosing .................................................................................................7.17
Figure 7.18 Latch Control Switch (With Time Delay Feedback) Operation Time Line..........................7.18
Figure 7.19 SCADA Contact Pulses Input IN105 to Switch Active Setting Group Between Setting
Groups 1 and 4 ..................................................................................................................7.21
Figure 7.20 SELOGIC Control Equation Variable Timer SV8T Used in Setting Group Switching.........7.21
Figure 7.21 Active Setting Group Switching (With Single Input) Time Line.........................................7.23
Figure 7.22 Rotating Selector Switch Connected to Inputs IN101, IN102, and IN103 for Active
Setting Group Switching...................................................................................................7.24
Figure 7.23 Active Setting Group Switching (With Rotating Selector Switch) Time Line.....................7.26
Figure 7.24 SELOGIC Control Equation Variables/Timers SV1/SV1T–SV6/SV6T................................7.28
Figure 7.25 SELOGIC Control Equation Variables/Timers SV7/SV7T–SV16/SV16T............................7.29
Figure 7.26 Dedicated Breaker Failure Scheme Created With SELOGIC Control Equation
Variables/Timers ...............................................................................................................7.30
Figure 7.27 Logic Flow for Example Output Contact Operation ............................................................7.34

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Date Code 20080103 Instruction Manual SEL-351S Relay
List of Figures
Figure 7.28 Logic Flow for Example Output Contact Operation—Extra I/O Board .............................. 7.35
Figure 7.29 Traditional Panel Light Installations .................................................................................... 7.36
Figure 7.30 Rotating Default Display Replaces Traditional Panel Light Installations............................ 7.37
Figure 8.1 Plotted Breaker Maintenance Points for a 25 kV Circuit Breaker ......................................... 8.3
Figure 8.2 SEL-351S Breaker Maintenance Curve for a 25 kV Circuit Breaker .................................... 8.5
Figure 8.3 Operation of SELOGIC Control Equation Breaker Monitor Initiation Setting ....................... 8.6
Figure 8.4 Breaker Monitor Accumulates 10 Percent Wear.................................................................... 8.8
Figure 8.5 Breaker Monitor Accumulates 25 Percent Wear.................................................................... 8.9
Figure 8.6 Breaker Monitor Accumulates 50 Percent Wear.................................................................. 8.10
Figure 8.7 Breaker Monitor Accumulates 100 Percent Wear ................................................................ 8.11
Figure 8.8 Input IN106 Connected to Trip Bus for Breaker Monitor Initiation.................................... 8.13
Figure 8.9 DC Under- and Overvoltage Elements................................................................................. 8.15
Figure 8.10 Create DC Voltage Elements with SELOGIC Control Equations.......................................... 8.16
Figure 8.11 Response of Thermal and Rolling Demand Meters to a Step Input (Setting DMTC = 15
Minutes)............................................................................................................................ 8.21
Figure 8.12 Voltage VSApplied to Series RC Circuit............................................................................. 8.22
Figure 8.13 Demand Current Logic Outputs ........................................................................................... 8.25
Figure 8.14 Raise Pickup of Residual Ground Time-Overcurrent Element for Unbalance Current ....... 8.26
Figure 9.1 U.S. Moderately Inverse Curve: U1....................................................................................... 9.7
Figure 9.2 U.S. Inverse Curve: U2 .......................................................................................................... 9.8
Figure 9.3 U.S. Very Inverse Curve: U3 ................................................................................................. 9.9
Figure 9.4 U.S. Extremely Inverse Curve: U4.......................................................................................9.10
Figure 9.5 U.S. Short-Time Inverse Curve: U5..................................................................................... 9.11
Figure 9.6 I.E.C. Class A Curve (Standard Inverse): C1....................................................................... 9.12
Figure 9.7 I.E.C. Class B Curve (Very Inverse): C2 ............................................................................. 9.13
Figure 9.8 I.E.C. Class C Curve (Extremely Inverse): C3 .................................................................... 9.14
Figure 9.9 I.E.C. Long-Time Inverse Curve: C4................................................................................... 9.15
Figure 9.10 I.E.C. Short-Time Inverse Curve: C5...................................................................................9.16
Figure 9.11 Recloser Control Response Curves A, C, N, and W ............................................................ 9.17
Figure 9.12 Recloser Control Response Curves B, R, 2, and 3............................................................... 9.18
Figure 9.13 Recloser Control Response Curves D, 8PLUS, and 16........................................................ 9.19
Figure 9.14 Recloser Control Response Curves F, H, J, and 1................................................................ 9.20
Figure 9.15 Recloser Control Response Curves G, V, 6, and 13 ............................................................ 9.21
Figure 9.16 Recloser Control Response Curves E, P, and 18.................................................................. 9.22
Figure 9.17 Recloser Control Response Curves KG, Y, Z, and 5 ........................................................... 9.23
Figure 9.18 Recloser Control Response Curves KP, M, T, and 17 ......................................................... 9.24
Figure 9.19 Recloser Control Response Curves 4, 9, 11, and 14 ............................................................ 9.25
Figure 9.20 Recloser Control Response Curves L, 7, 8, and 15.............................................................. 9.26
Figure 9.21 Operation of DELTA and 3V0 Relay Word Bits.................................................................. 9.52
Figure 9.22 Hybrid Power System With Neutral Ground Resistor ......................................................... 9.54
Figure 10.1 DB-9 Connector Pinout for EIA-232 Serial Ports................................................................ 10.2
Figure 11.1 SEL-351S Front-Panel Pushbuttons—Overview ................................................................. 11.2
Figure 11.2 SEL-351S Front-Panel Pushbuttons—Primary Functions ................................................... 11.3
Figure 11.3 SEL-351S Front-Panel Pushbuttons—Primary Functions (continued)................................ 11.4
Figure 11.4 SEL-351S Front-Panel Pushbuttons—Secondary Functions ............................................... 11.5
Figure 11.5 Local Control Switch Configured as an ON/OFF Switch.................................................... 11.8
Figure 11.6 Local Control Switch Configured as an OFF/MOMENTARY Switch ................................ 11.8
Figure 11.7 Local Control Switch Configured as an ON/OFF/MOMENTARY Switch ......................... 11.8
Figure 11.8 Operator Controls—{GROUND ENABLED}–{LOCK}.................................................................. 11.19
Figure 11.9 Operator Controls—{HOT LINE TAG} through {TRIP} (Model 0351Sxxx3)............................ 11.19
Figure 11.10 {GROUND ENABLED} Operator Control Pushbutton Output ................................................... 11.20
Figure 11.11 {LOCK} Operator Control Pushbutton Output ...................................................................... 11.21
Figure 11.12 {CLOSE} Operator Control Pushbutton Output..................................................................... 11.22
Figure 11.13 {TRIP} Operator Control Pushbutton Output....................................................................... 11.22
Figure 11.14 {GROUND ENABLED} Operator Control LED and Logic ........................................................ 11.24
Figure 11.15 {RECLOSE ENABLED} and {HOT LINE TAG ENABLED} Operator Control Logic ........................... 11.25
Figure 11.16 {REMOTE ENABLED} Operator Control Logic......................................................................... 11.25

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SEL-351S Relay Instruction Manual Date Code 20080103
List of Figures
Figure 11.17 Example {REMOTE ENABLED} Operator Control Application (Supervising Remote Control
of Ground Overcurrent Elements)...................................................................................11.26
Figure 11.18 {AUX 1} Operator Control Logic ...........................................................................................11.26
Figure 11.19 {AUX 2} Operator Control Logic ..........................................................................................11.27
Figure 11.20 {ALTERNATE SETTINGS} Operator Control LED and Logic ....................................................11.28
Figure 11.21 {LOCK} Operator Control LED and Logic............................................................................11.29
Figure 12.1 Example Event Summary .....................................................................................................12.4
Figure 12.2 Example Synchrophasor-Level Precise Event Report 1/16-Cycle Resolution .....................12.7
Figure 12.3 Example Standard 15-Cycle Event Report 1/4-Cycle Resolution......................................12.30
Figure 12.4 Example Partial Event Report with Delta-Connected PTs .................................................12.31
Figure 12.5 Derivation of Event Report Current Values and RMS Current Values From Sampled
Current Waveform...........................................................................................................12.32
Figure 12.6 Derivation of Phasor RMS Current Values From Event Report Current Values ................12.33
Figure 12.7 Example SER Report..........................................................................................................12.34
Figure 12.8 Example Sag/Swell/Interruption (SSI) Report (PTCONN = WYE) ..................................12.43
Figure 12.9 Example Sag/Swell/Interruption (SSI) Report (PTCONN = DELTA) ...............................12.43
Figure 13.1 Low-Level Test Interface (J1 or J10) Connector ..................................................................13.6
Figure B.1 Establishing a Connection ..................................................................................................... B.3
Figure B.2 Determining the Computer Serial Port .................................................................................. B.4
Figure B.3 Determining Communications Parameters for the Computer ............................................... B.4
Figure B.4 Setting Terminal Emulation................................................................................................... B.5
Figure B.5 Terminal Emulation Startup Prompt......................................................................................B.5
Figure B.6 Correcting the Port Setting .................................................................................................... B.6
Figure B.7 Correcting the Communications Parameters ......................................................................... B.6
Figure B.8 Preparing HyperTerminal for ID Command Display ............................................................ B.8
Figure B.9 List of Commands Available in SELBOOT ............................................................................ B.9
Figure B.10 Matching Computer to Relay Parameters............................................................................ B.10
Figure B.11 Example Receive File Dialog Box.......................................................................................B.10
Figure B.12 Example Filename Identifying Old Firmware Version........................................................ B.11
Figure B.13 Downloading Old Firmware ................................................................................................ B.11
Figure B.14 Selecting New Firmware to Send to the Relay.................................................................... B.12
Figure B.15 Transferring New Firmware to the Relay ............................................................................ B.13
Figure B.16 Preparing HyperTerminal for ID Command Display .......................................................... B.17
Figure B.17 Establishing an FTP Connection ......................................................................................... B.19
Figure B.18 Alternate Method of Establishing an FTP Connection........................................................ B.20
Figure B.19 Read (Open) File ................................................................................................................. B.20
Figure B.20 Page Cannot Be Displayed Window.................................................................................... B.21
Figure F.1 Minimum Response Time Added to a Negative-Sequence Time-Overcurrent
Element 51QT ..................................................................................................................... F.2
Figure F.2 Distribution Feeder Protective Devices .................................................................................. F.4
Figure F.3 Traditional Phase Coordination .............................................................................................. F.4
Figure F.4 Phase-to-Phase Fault Coordination.........................................................................................F.5
Figure F.5 Negative-Sequence Overcurrent Element Derived from Equivalent Phase Overcurrent
Element, 51EP.....................................................................................................................F.6
Figure G.1 Result of Rising Edge Operators on Individual Elements in Setting ER .............................G.8
Figure G.2 Result of Falling Edge Operator on a Deasserting Underfrequency Element .......................G.9
Figure L.1 Phase Reference..................................................................................................................... L.3
Figure L.2 Waveform at Relay Terminals May Have Phase Shift........................................................... L.4
Figure L.3 Correction of Measured Phase Angle.................................................................................... L.4
Figure L.4 Sample MET PM Command Response ............................................................................... L.13

Date Code 20080103 Instruction Manual SEL-351S Relay
Preface
Overview
This manual provides information and instructions for installing, setting,
configuring, and operating the SEL-351S Relay. The manual is for use by
power engineers and others experienced in protective relaying applications.
Included are detailed technical descriptions of the relay and application
examples.
An overview of each manual section and section topics follows.
Preface. Describes the manual organization and conventions used to
present information.
Section 1: Introduction and Specifications.Includes an explanation of
SEL-351S models; a diagram showing how the relay can be applied in
a power system; hardware connection features; communications
connections; and specifications.
Section 2: Installation.Describes mounting and wiring the SEL-351S;
connections for numerous applications; operation of circuit board
jumpers; and relay front and rear panels.
Section 3: Overcurrent, Voltage, Synchronism Check, Frequency, and
Power Elements.Describes the operation of instantaneous/definite-time
overcurrent elements (phase, neutral ground, residual ground, and
negative-sequence); time-overcurrent elements (phase, neutral ground,
residual ground, and negative-sequence); voltage elements (single-
phase, phase-to-phase, etc.); synchronism check elements; frequency
elements; power elements (in Firmware Version 7); and voltage sag/
swell/interruption elements (in Firmware Version 7).
Section 4: Loss-of-Potential, Load Encroachment, and Directional Element
Logic. Describes the operation of loss-of-potential logic and its effect on
directional elements; load-encroachment logic and its application to
phase overcurrent elements; voltage-polarized and current-polarized
directional elements; and Best Choice Ground Directional™ logic and
automatic settings
Section 5: Trip and Target Logic . Describes the operation of general trip
logic; switch-onto-fault trip logic; communications-assisted trip logic;
and front-panel target LEDs.
Most tripping applications (not requiring switch-onto-fault or
communications-assisted tripping) require only SELOGIC®control
equation trip setting TR and unlatch trip setting ULTR in the general
trip logic (see Figure 5.1).
Section 6: Close and Reclose Logic. Describes the close logic operation
for automatic reclosures and other close conditions (e.g., manual close
initiation via serial port or optoisolated inputs).
Section 7: Inputs, Outputs, Timers, and Other Control Logic.Describes the
operation of optoisolated inputs IN101–IN106 and IN201–IN208 (extra I/O
board); local control switches (local bit outputs LB1–LB16); remote
control switches (remote bit outputs RB1–RB16); latch control
switches (latch bit outputs LT1–LT16); multiple setting groups (six

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Preface
available); programmable timers (timer outputs SV1T–SV16T); output
contacts OUT101–OUT107 and ALARM and OUT201–OUT212 (extra I/O
board); and rotating default displays.
Section 8: Breaker Monitor, Metering, and Load Profile Functions.
Describes the operation of breaker monitor; demand, energy, and
max./min. metering; and load profile (in Firmware Versions 6 and 7)
Section 9: Setting the Relay.Explains how to enter settings and also
contains the following setting reference information:
➤Time-overcurrent curves (5 US, 5 IEC, and 38 recloser curves)
➤Relay Word bit table and definitions (Relay Word bits are used
in SELOGIC control equation settings)
➤SEL-351S Settings Sheets for general relay, SELOGIC control
equation, global, SER, text label, and serial port settings
The Settings Sheets can be photocopied and filled out to set the
SEL-351S. Note that these sheets correspond to the serial port
SET commands listed in Table 9.1.
Section 10: Serial Port Communications and Commands.Describes serial
port connector pinout/terminal functions; communications cables;
communications protocol; and serial port commands.
See SHO Command (Show/View Settings) on page 10.27 for a list of
factory default settings set for a standard relay shipment.
Section 11: Front-Panel Interface.Describes the front-panel operation of
pushbuttons and correspondence to serial port commands; local
control switches (local bit outputs LB1–LB16); rotating default
displays; and operator controls.
Section 12: Standard Event Reports, Sag/Swell/Interruption Report, and
SER.Describes standard 15- and 30-cycle event reports; sequential events
recorder (SER) report; and voltage sag/swell/interruption (SSI) report
(in Firmware Version 7).
Section 13: Testing and Troubleshooting.Describes general testing
philosophy, methods, and tools; and relay self-tests and
troubleshooting.
Section 14: Appendices. Contains the following appendices:
➤Appendix A: Firmware and Manual Versions
➤Appendix B: SEL-300 Series Relays
Firmware Upgrade Instructions
➤Appendix C: SEL Distributed Port Switch Protocol
➤Appendix D: Configuration, Fast Meter, and Fast Operate
Commands
➤Appendix E: Compressed ASCII Commands
➤Appendix F: Setting Negative-Sequence Overcurrent Elements
➤Appendix G: Setting SELOGIC Control Equations
➤Appendix H: Distributed Network Protocol
➤Appendix I: MIRRORED BITS Communications (In Firmware
Versions 6 and 7)
➤Appendix J: SEL-351S Fast SER Protocol

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Date Code 20080103 Instruction Manual SEL-351S Relay
Preface
➤Appendix K: acSELerator QuickSet SEL-5030 Software
➤Appendix L: SEL Synchrophasors
The SEL-351S Relay Command Summary briefly describes the serial port
commands that are described in detail in Section 10: Serial Port
Communications and Commands.

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Preface
Conventions
Typographic
Conventions
There are three ways to communicate with the SEL-351S:
➤Using a command line interface on a PC terminal emulation
window.
➤Using the front-panel menus and pushbuttons.
➤Using ACSELERATOR®QuickSet™SEL-5030 Software.
The instructions in this manual indicate these options with specific font and
formatting attributes. The following table lists these conventions.
Cross References Cross-references are formatted as described below in both the hard copy and
electronic documentation for the SEL-351S. In the electronic documentation,
clicking with the mouse on cross-references takes you to the referenced
location.
➤References to figures, tables, examples, and equations include
only the referenced item:
➢Table 3.1 (3indicates the section number)
➢Figure 4.5 (4indicates the section number)
➤References to headings on another page include the heading
title and the page number:
➢Disconnect Monitoring on page 3.8
Examples This instruction manual uses several example illustrations and instructions to
explain how to effectively operate the SEL-351S. These examples are for
demonstration purposes only; the firmware identification information or
settings values included in these examples may not necessarily match those in
the current version of your SEL-351S.
Typographic Conventions
Example Description
STATUS Commands, command options, and command variables typed at a
command line interface on a PC.
n
SHO n
Variables determined based on an application (in bold if part of a
command).
<Enter> Single keystroke on a PC keyboard.
<Ctrl+D> Multiple/combination keystroke on a PC keyboard.
Start > Settings PC software dialog boxes and menu selections. The > character
indicates submenus.
{CLOSE} Relay front-panel pushbuttons.
ENABLE Relay front- or rear-panel labels.
MAIN > METER Relay front-panel LCD menus. The >character indicates sub-
menus.
Are you sure? Relay responses visible on the PC screen.