Schweitzer Engineering Laboratories SEL-351A User manual
SEL-351A Relay Instruction Manual Date Code 20080213
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
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
Have only qualified personnel service this equipment. If you are
not qualified to service this equipment, you can injure yourself
or others, or cause equipment damage.
!
WARNING
Use of this equipment in a manner other than specified in this
manual can impair operator safety safeguards provided by this
equipment.
!
WARNING
Contact with instrument terminals can cause electrical shock
that can result in injury or death.
!
DANGER
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
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
Seules des personnes qualifiées peuvent travailler sur cet
appareil. Si vous n’êtes pas qualifiés pour ce travail, vous
pourriez vous blesser avec d’autres personnes ou endommager
l’équipement.
!
AVERTISSEMENT
L’utilisation de cet appareil suivant des procédures différentes
de celles indiquées dans ce manuel peut désarmer les
dispositifs de protection d’opérateur normalement actifs sur
cet équipement.
!
AVERTISSEMENT
Tout contact avec les bornes de l’appareil peut causer un choc
électrique pouvant entraîner des blessuers ou la mort.
!
DANGER
© 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. PM351A-01
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Date Code 20080213 Instruction Manual SEL-351A Relay
Table of Contents
List of Tables ........................................................................................................................................................ v
List of Figures..................................................................................................................................................... ix
Preface ................................................................................................................................................................. xv
Section 1: Introduction and Specifications
Overview ......................................................................................................................................................... 1.1
SEL-351A Models........................................................................................................................................... 1.2
Applications..................................................................................................................................................... 1.6
Hardware Connection Features ....................................................................................................................... 1.7
Communications Connections......................................................................................................................... 1.9
Specifications ................................................................................................................................................ 1.10
Section 2: Installation
Overview ......................................................................................................................................................... 2.1
Relay Mounting ............................................................................................................................................... 2.2
Front-Panel and Rear-Panel Connection Diagrams......................................................................................... 2.4
Making Rear-Panel Connections ................................................................................................................... 2.10
SEL-351A AC/DC Connection Diagrams for Various Applications ............................................................ 2.20
Circuit Board Connections ............................................................................................................................ 2.34
Section 3: Overcurrent, Voltage, Synchronism Check, and Frequency Elements
Instantaneous/Definite-Time Overcurrent Elements ....................................................................................... 3.1
Time-Overcurrent Elements .......................................................................................................................... 3.16
Voltage Elements ........................................................................................................................................... 3.28
Synchronism Check Elements (Not in SEL-351A-1) ................................................................................... 3.36
Frequency Elements ...................................................................................................................................... 3.49
Section 4: Loss-of-Potential, Load Encroachment, and Directional Element Logic
Loss-of-Potential Logic (Not in the SEL-351A-1).......................................................................................... 4.1
Load-Encroachment Logic (Not in SEL-351A-1)........................................................................................... 4.4
Directional Control for Neutral-Ground and Residual-Ground
Overcurrent Elements (Not in SEL-351A-1) ................................................................................................ 4.9
Directional Control for Negative-Sequence and Phase Overcurrent Elements (Not in SEL-351A-1).......... 4.30
Directional Control Settings (Not in SEL-351A-1)....................................................................................... 4.38
Directional Control Provided by Torque Control Settings (Not in SEL-351A-1)......................................... 4.57
Section 5: Trip and Target Logic
Trip Logic ........................................................................................................................................................ 5.1
Switch-Onto-Fault (SOTF) Trip Logic............................................................................................................ 5.7
Front-Panel Target LEDS .............................................................................................................................. 5.10
Section 6: Close and Reclose Logic
Overview ......................................................................................................................................................... 6.1
Close Logic...................................................................................................................................................... 6.2
Reclose Supervision Logic .............................................................................................................................. 6.5
Reclosing Relay............................................................................................................................................. 6.12
Section 7: Inputs, Outputs, Timers, and Other Control Logic
Overview ......................................................................................................................................................... 7.1
Optoisolated Inputs.......................................................................................................................................... 7.2
Local Control Switches (Only on Models With LCD).................................................................................... 7.5
Remote Control Switches ................................................................................................................................ 7.9
Latch Control Switches ................................................................................................................................. 7.11
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SEL-351A Relay Instruction Manual Date Code 20080213
Table of Contents
Multiple Setting Groups.................................................................................................................................7.18
SELOGIC Control Equation Variables/Timers................................................................................................7.27
Output Contacts .............................................................................................................................................7.31
Rotating Default Display (Only on Models With LCD)................................................................................7.34
Section 8: Breaker Monitor and Metering
Overview..........................................................................................................................................................8.1
Breaker Monitor...............................................................................................................................................8.2
Station DC Battery Monitor (Not in SEL-351A-1) .......................................................................................8.15
Demand Metering ..........................................................................................................................................8.20
Energy Metering ............................................................................................................................................8.28
Maximum/Minimum Metering ......................................................................................................................8.29
Small Signal Cutoff for Metering ..................................................................................................................8.31
Synchrophasor Metering................................................................................................................................8.32
Section 9: Setting the Relay
Overview..........................................................................................................................................................9.1
Settings Changes Via the Front Panel (Only on Models With LCD) ..............................................................9.2
Settings Changes Via the Serial Port ...............................................................................................................9.2
Time-Overcurrent Curves ................................................................................................................................9.4
Relay Word Bits (Used in SELOGIC Control Equations)...............................................................................9.16
Settings Explanations.....................................................................................................................................9.34
Settings Sheets ...............................................................................................................................................9.42
SEL-351A Settings Sheets
SEL-351A-1 Settings Sheets
Section 10: Serial Port Communications and Commands
Overview........................................................................................................................................................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-351A Command Summary
Section 11: Front-Panel Interface (Only on Models With LCD)
Overview........................................................................................................................................................11.1
Front-Panel Pushbutton Operation.................................................................................................................11.2
Functions Unique to the Front-Panel Interface..............................................................................................11.6
Rotating Default Display .............................................................................................................................11.12
Section 12: Standard Event Reports and SER
Overview........................................................................................................................................................12.1
Standard 15/30-Cycle Event Reports.............................................................................................................12.2
Sequential Events Recorder (SER) Report ..................................................................................................12.21
Example Standard 15-Cycle Event Report ..................................................................................................12.24
Example Sequential Events Recorder (SER) Report ...................................................................................12.30
Section 13: Testing and Troubleshooting
Overview........................................................................................................................................................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
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Table of Contents
Factory Assistance....................................................................................................................................... 13.14
Appendix A: Firmware and Manual Versions
Firmware......................................................................................................................................................... A.1
Instruction Manual.......................................................................................................................................... A.7
Appendix B: Firmware Upgrade Instructions
Overview .........................................................................................................................................................B.1
Relay Firmware Upgrade Instructions.............................................................................................................B.2
Ethernet Port Firmware Upgrade Instructions...............................................................................................B.19
Appendix C: SEL Distributed Port Switch Protocol
Overview .........................................................................................................................................................C.1
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
Overview .........................................................................................................................................................E.1
CASCII Command—General Format .............................................................................................................E.2
CASCII Command—SEL-351A .....................................................................................................................E.4
CSTATUS Command—SEL-351A .................................................................................................................E.5
CHISTORY Command—SEL-351A ..............................................................................................................E.6
CEVENT Command—SEL-351A ..................................................................................................................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.8
Appendix G: Setting SELOGIC Control Equations
Overview ........................................................................................................................................................ G.1
Relay Word Bits.............................................................................................................................................. G.2
SELOGIC Control Equations........................................................................................................................... G.4
Processing Order and Processing Interval.................................................................................................... G.12
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
DNP Settings Sheets
SET: Appendix I: Using the SEL-251 and SEL-267 Relay Settings in the SEL-351A Relay
Overview ..........................................................................................................................................................I.1
Main Differences Between Settings for the SEL-251, SEL-267, and SEL-351A Relays................................I.2
Other Differences Between the SEL-351A and the SEL-251-3 and SEL-267-5 Relays .................................I.5
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SEL-351A Relay Instruction Manual Date Code 20080213
Table of Contents
Appendix J: SEL-351A Fast SER Protocol
Overview.......................................................................................................................................................... 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
Overview.........................................................................................................................................................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
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Date Code 20080213 Instruction Manual SEL-351A Relay
List of Tables
Table 1.1 SEL-351A Models.................................................................................................................. 1.2
Table 1.2 SEL-351A-1 Models .............................................................................................................. 1.2
Table 1.3 Major Differences—SEL-351, SEL-351A, and SEL-351A-1 ............................................... 1.3
Table 2.1 Communications Cables to Connect the SEL-351A to Other Devices ................................ 2.19
Table 2.2 Output Contact Jumpers and Corresponding Output Contacts ............................................ 2.36
Table 2.3 “Extra Alarm” Output Contacts and Corresponding Controlling Jumpers.......................... 2.36
Table 2.4 Required Position of Jumper JMP23 for Desired Output Contact OUT107 Operation....... 2.36
Table 2.5 Password and Breaker Jumper Positions for Standard Relay Shipments............................. 2.37
Table 2.6 Password and Breaker Jumper Operation ............................................................................ 2.37
Table 2.7 EIA-232 Serial Port Voltage Jumper Positions for Standard Relay Shipments ................... 2.37
Table 3.1 Available Phase Time-Overcurrent Elements....................................................................... 3.16
Table 3.2 Phase Time-Overcurrent Element (Maximum Phase) Settings............................................ 3.16
Table 3.3 Phase Time-Overcurrent Element (Maximum Phase) Logic Outputs.................................. 3.17
Table 3.4 Neutral-Ground Time-Overcurrent Element Settings .......................................................... 3.23
Table 3.5 Available Residual-Ground Time-Overcurrent Elements .................................................... 3.24
Table 3.6 Residual-Ground Time-Overcurrent Element 51GT Settings.............................................. 3.24
Table 3.7 Residual-Ground Time-Overcurrent Element 51G2T Settings............................................ 3.25
Table 3.8 Negative-Sequence Time-Overcurrent Element Settings ..................................................... 3.27
Table 3.9 Voltage Values Used by Voltage Elements........................................................................... 3.28
Table 3.10 Voltage Elements Settings and Settings Ranges (Wye-Connected PTs).............................. 3.28
Table 3.11 Voltage Elements Settings and Settings Ranges (VS Channel) ........................................... 3.29
Table 3.12 Voltage Elements Settings and Settings Ranges (Delta-Connected PTs)............................. 3.29
Table 3.13 Synchronism Check Elements Settings and Settings Ranges .............................................. 3.36
Table 3.14 Frequency Elements Settings and Settings Ranges.............................................................. 3.51
Table 4.1 Available Ground Directional Elements............................................................................... 4.11
Table 4.2 Best Choice Ground Directional Element™ Logic.............................................................. 4.12
Table 4.3 Ground Directional Element Availability by Voltage Connection Settings ......................... 4.13
Table 4.4 Overcurrent Elements Controlled by Level Direction Settings DIR1–DIR4
(Corresponding Overcurrent Element Figure Numbers in Parentheses) .......................... 4.39
Table 4.5 Affect of Global Settings VSCONN and PTCONN on
Petersen Coil Directional Elements.................................................................................. 4.55
Table 5.1 SEL-351A Front-Panel Target LED Definitions .................................................................. 5.10
Table 6.1 Relay Word Bit and Front-Panel Correspondence to Reclosing Relay States ..................... 6.13
Table 6.2 Reclosing Relay Timer Settings and Setting Ranges ........................................................... 6.15
Table 6.3 Shot Counter Correspondence to Relay Word Bits and Open Interval Times ..................... 6.18
Table 6.4 Reclosing Relay SELOGIC Control Equation Settings ......................................................... 6.18
Table 6.5 Example Open Interval Time Settings ................................................................................. 6.24
Table 7.1 Correspondence Between Local Control Switch Positions and Label Settings..................... 7.5
Table 7.2 Correspondence Between Local Control Switch Types and Required Label Settings........... 7.6
Table 7.3 Definitions for Active Setting Group Indication Relay Word Bits SG1 Through SG6 ....... 7.18
Table 7.4 Definitions for Active Setting Group Switching
SELOGIC Control Equation Settings SS1–SS6................................................................. 7.18
Table 7.5 SELOGIC Control Equation Settings for Switching Active
Setting Group Between Setting Groups 1 and 4............................................................... 7.20
Table 7.6 Active Setting Group Switching Input Logic....................................................................... 7.22
Table 7.7 SELOGIC Control Equation Settings for Rotating Selector
Switch Active Setting Group Switching........................................................................... 7.23
Table 7.8 Mnemonic Settings for Metering on the Rotating Default Display ..................................... 7.41
Table 7.9 Mnemonic Settings for Breaker Wear Monitor Values on the Rotating Default Display .... 7.45
Table 7.10 Mnemonic Settings for Time-Overcurrent (TOC) Element Pickups
on the Rotating Default Display ....................................................................................... 7.47
Table 7.11 Mnemonic Settings for Time-Overcurrent (TOC) Element Pickups Using the
Same-Line-Label Format on the Rotating Default Display.............................................. 7.47
Table 8.1 Breaker Maintenance Information for a 25 kV Circuit Breaker ............................................ 8.2
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vi List of Tables
SEL-351A Relay Instruction Manual Date Code 20080213
Table 8.2 Breaker Monitor Settings and Settings Ranges ......................................................................8.4
Table 8.3 Demand Meter Settings and Settings Range ........................................................................8.24
Table 8.4 Operation of Maximum/Minimum Metering With Directional Power Quantities ...............8.29
Table 9.1 Serial Port SET Commands....................................................................................................9.1
Table 9.2 Set Command Editing Keystrokes..........................................................................................9.2
Table 9.3 Equations Associated With U.S. Curves ................................................................................9.4
Table 9.4 Equations Associated With IEC Curves .................................................................................9.4
Table 9.5 SEL-351A Relay Word Bits .................................................................................................9.16
Table 9.6 Relay Word Bit Definitions for SEL-351A ..........................................................................9.18
Table 9.7 Main Relay Functions That Change With VSCONN, When PTCONN = WYE .................9.37
Table 9.8 Main Relay Functions That Change With VSCONN, When PTCONN = DELTA..............9.38
Table 9.9 Main Relay Functions That Change With VNOM = OFF....................................................9.38
Table 10.1 SEL-351A Available Serial Ports .........................................................................................10.1
Table 10.2 Pinout Functions for EIA-232 Serial Ports 2, 3, and F.........................................................10.2
Table 10.3 Terminal Functions for EIA-485 Serial Port 1 .....................................................................10.2
Table 10.4 Serial Communications Port Pin/Terminal Function Definitions.........................................10.4
Table 10.5 Serial Port Automatic Messages...........................................................................................10.9
Table 10.6 Serial Port Command Summary .........................................................................................10.12
Table 10.7 SEL-351A Word and Its Correspondence to TAR Command............................................10.31
Table 10.8 SEL-351A Control Subcommands .....................................................................................10.37
Table 10.9 Valid Password Characters .................................................................................................10.38
Table 12.1 Event Types...........................................................................................................................12.5
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.....................12.12
Table 13.1 Test Features Provided by the Relay.....................................................................................13.5
Table 13.2 Resultant Scale Factors for Input Module ............................................................................13.6
Table 13.3 Relay Self-Tests ....................................................................................................................13.9
Table A.1 SEL-351A Firmware Revision History .................................................................................A.1
Table A.2 SEL-351A-1 Firmware Revision History..............................................................................A.5
Table A.3 Instruction Manual Revision History.....................................................................................A.7
Table B.1 Troubleshooting New Firmware Upload ............................................................................. B.14
Table D.1 Binary Message List ..............................................................................................................D.2
Table D.2 ASCII Configuration Message List .......................................................................................D.2
Table D.3 A5C0 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.9
Table D.9 A5E0 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 E.1 Mapping Labels to Bits.......................................................................................................... E.9
Table G.1 SELOGIC Control Equation Operators (Listed in Processing Order) ....................................G.4
Table G.2 SELOGIC Control Equation Settings Limitations ................................................................G.10
Table G.3 Processing Order of Relay Elements and Logic (Top to Bottom) .......................................G.12
Table H.1 Settings to Configure a Port for DNP....................................................................................H.2
Table H.2 Settings to Configure a Port for Extended Mode DNP..........................................................H.2
Table H.3 Data Access Methods ............................................................................................................H.6
Table H.4 SEL-351A DNP3 Device Profile...........................................................................................H.7
Table H.5 SEL-351A DNP Object Table ...............................................................................................H.9
Table H.6 SEL-351A 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 J.1 Message Format for Function Code 01 .................................................................................. J.4
Table J.2 Message Format for Function Code 02 .................................................................................. J.5
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viiList of Tables
Date Code 20080213 Instruction Manual SEL-351A Relay
Table J.3 Message Format for Function Code 18...................................................................................J.5
Table J.4 Message if SER Records Are Lost..........................................................................................J.6
Table J.5 Acknowledge Message Format ...............................................................................................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-351A Global Settings for Synchrophasors.....................................................................L.8
Table L.6 SEL-351A 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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List of Figures
Figure 1.1 SEL-351A Relays Applied Throughout the Power System ................................................... 1.6
Figure 1.2 SEL-351A Inputs, Outputs, and Communications Ports........................................................ 1.8
Figure 1.3 SEL-351A Communications Connections Examples ............................................................ 1.9
Figure 2.1 SEL-351A Dimensions for Rack-Mount and Panel-Mount Models ...................................... 2.3
Figure 2.2 SEL-351A Rear-Panel Diagram—Conventional Terminal Blocks, Horizontal Example...... 2.5
Figure 2.3 SEL-351A Front-Panel Drawings (Rack Mount Relays)....................................................... 2.6
Figure 2.4 SEL-351A Front-Panel Drawings (Panel-Mount Relays)...................................................... 2.7
Figure 2.5 SEL-351A Front-Panel Drawing (Vertical Panel-Mount Relay, Model 0351A0x41)
and Rear-Panel Drawing (Vertical Relay, Conventional Terminal Blocks,
Model 0351A0041)............................................................................................................. 2.8
Figure 2.6 SEL-351A Rear-Panel Drawings—Connectorized Models 0351A0WH,
0351A0W3, or 0351A0W5 (Horizontal) and 0351A0W4 (Vertical) ................................. 2.9
Figure 2.7 SEL-351A Plug-In Connector Coding (Top View; Model 0351A0W)................................ 2.11
Figure 2.8 Broken-Delta Secondary Connection to Voltage Input VS, Wye-Connected PTs ............... 2.16
Figure 2.9 Resultant Voltage VSfrom the Collapse of Voltage VAin the Broken-Delta
Secondary (Compared to the Wye-Connected Power System Voltages).......................... 2.17
Figure 2.10 Broken-Delta Secondary Connection to Voltage Input VS, Open-Delta Connected PTs.... 2.17
Figure 2.11 Resultant Voltage VSfrom the Collapse of Voltage VAin the Broken-Delta Secondary
(Compared to the Open-Delta Connected Power System Voltages)................................. 2.18
Figure 2.12 SEL-351A Provides Overcurrent Protection and Reclosing for a Utility Distribution
Feeder (Includes Fast Bus Trip Scheme) (Wye-Connected PTs) ..................................... 2.20
Figure 2.13 SEL-351A Provides Overcurrent Protection for a Distribution Bus
(Includes Fast Bus Trip Scheme) (Wye-Connected PTs) ................................................. 2.21
Figure 2.14 SEL-351A Provides Directional Overcurrent Protection and Reclosing for a
Transmission Line (Wye-Connected PTs)........................................................................ 2.22
Figure 2.15 SEL-351A Provides Directional Overcurrent Protection and Reclosing for a Transmission
Line (Current Polarization Source Connected to Channel IN) (Wye-Connected PTs) .... 2.23
Figure 2.16 SEL-351A Provides Overcurrent Protection for a Delta-Wye Transformer Bank
(Wye-Connected PTs)....................................................................................................... 2.24
Figure 2.17 SEL-351A Provides Overcurrent Protection for a Transformer Bank With a Tertiary
Winding (Wye-Connected PTs)........................................................................................ 2.25
Figure 2.18 SEL-351A Provides Overcurrent Protection for an Industrial Distribution Feeder
(Core-Balance Current Transformer Connected to Channel IN)...................................... 2.26
Figure 2.19 SEL-351A Provides Dedicated Breaker Failure Protection ................................................. 2.27
Figure 2.20 SEL-351A Provides Overcurrent Protection for a High-Impedance or Low-Impedance
Grounded System (Wye-Connected PTs)......................................................................... 2.28
Figure 2.21 SEL-351A Provides Overcurrent Protection for a Petersen Coil Grounded System
(Wye-Connected PTs)....................................................................................................... 2.29
Figure 2.22 SEL-351A Provides Overcurrent Protection for an Ungrounded System
(Wye-Connected PTs)....................................................................................................... 2.30
Figure 2.23 SEL-351A Provides Overcurrent Protection for an Ungrounded System
(Open-Delta Connected PTs, Broken-Delta 3V0 Connection)......................................... 2.31
Figure 2.24 SEL-351A Provides Overcurrent Protection and Reclosing for a Utility Distribution Feeder
(Open-Delta Connected PTs and Line-to-Ground Synchronism-Check Connection) ..... 2.32
Figure 2.25 SEL-351A Provides Underfrequency Load Shedding, Overcurrent Protection,
and Reclosing for a Utility Distribution Feeder (Single Voltage Connection)................. 2.33
Figure 2.26 Jumper, Connector, and Major Component Locations on the SEL-351A Main Board ....... 2.35
Figure 3.1 Levels 1 Through 4 Phase Instantaneous Overcurrent Elements ........................................... 3.2
Figure 3.2 Levels 5 Through 6 Phase Instantaneous Overcurrent Elements ........................................... 3.2
Figure 3.3 Levels 1 Through 4 Phase Instantaneous/Definite-Time Overcurrent Elements
(With Directional Control Option) (Not in SEL-351A-1).................................................. 3.4
Figure 3.4 Combined Single-Phase Instantaneous Overcurrent Elements .............................................. 3.6
Figure 3.5 SEL-351A Nondirectional Instantaneous Overcurrent Element Pickup Time Curve............ 3.7
Figure 3.6 SEL-351A Nondirectional Instantaneous Overcurrent Element Reset Time Curve .............. 3.7
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xList of Figures
SEL-351A Relay Instruction Manual Date Code 20080213
Figure 3.7 Levels 1 Through 4 Phase-to-Phase Instantaneous Overcurrent Elements ............................3.9
Figure 3.8 Levels 1 Through 4 Neutral-Ground Instantaneous Overcurrent Elements
(With Directional Control and Definite-Time Elements in SEL-351A) ...........................3.10
Figure 3.9 Levels 5 Through 6 Neutral-Ground Instantaneous Overcurrent Elements .........................3.10
Figure 3.10 Levels 1 Through 4 Residual-Ground Instantaneous Overcurrent Elements
(With Directional Control and Definite-Time Elements in SEL-351A) ...........................3.12
Figure 3.11 Levels 5 Through 6 Residual-Ground Instantaneous Overcurrent Elements .......................3.12
Figure 3.12 Levels 1 Through 4 Negative-Sequence Instantaneous Overcurrent Elements
(With Directional Control and Definite-Time Elements in SEL-351A) ...........................3.15
Figure 3.13 Levels 5 Through 6 Negative-Sequence Instantaneous Overcurrent Elements ....................3.15
Figure 3.14 Phase Time-Overcurrent Element 51PT (With Directional Control Option in SEL-351A).3.17
Figure 3.15 A-Phase Time-Overcurrent Element 51AT
(With Directional Control Option in SEL-351A) .............................................................3.21
Figure 3.16 B-Phase Time-Overcurrent Element 51BT
(With Directional Control Option in SEL-351A) .............................................................3.21
Figure 3.17 C-Phase Time-Overcurrent Element 51CT
(With Directional Control Option in SEL-351A) .............................................................3.22
Figure 3.18 Neutral-Ground Time-Overcurrent Element 51NT
(With Directional Control Option in SEL-351A) .............................................................3.22
Figure 3.19 Residual-Ground Time-Overcurrent Element 51GT
(With Directional Control Option in SEL-351A) .............................................................3.24
Figure 3.20 Residual-Ground Time-Overcurrent Element 51G2T (With Directional Control Option) ..3.25
Figure 3.21 Negative-Sequence Time-Overcurrent Element 51QT
(With Directional Control Option in SEL-351A) .............................................................3.26
Figure 3.22 Single-Phase and Three-Phase Voltage Elements (Wye-Connected PTs)............................3.31
Figure 3.23 Phase-to-Phase and Sequence Voltage Elements (Wye-Connected PTs) .............................3.32
Figure 3.24 Phase-to-Phase Voltage Elements (Delta-Connected PTs)...................................................3.33
Figure 3.25 Sequence Voltage Elements (Delta-Connected PTs)............................................................3.33
Figure 3.26 Channel VS Voltage Elements (Wye- or Delta-Connected PTs)..........................................3.34
Figure 3.27 Synchronism Check Voltage Window and Slip Frequency Elements ..................................3.38
Figure 3.28 Synchronism Check Elements ..............................................................................................3.39
Figure 3.29 Angle Difference Between VPand VSCompensated by Breaker Close Time
(fP< fSand VPShown as Reference in This Example) ....................................................3.45
Figure 3.30 Undervoltage Block for Frequency Elements (Group Setting VNOM ≠OFF)....................3.49
Figure 3.31 Undervoltage Block for Frequency Elements (Group Setting VNOM = OFF)....................3.49
Figure 3.32 Levels 1 Through 6 Frequency Elements .............................................................................3.50
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.........................................................................................................4.18
Figure 4.7 Internal Enables (32VE and 32IE) Logic for Zero-Sequence Voltage-Polarized
and Channel IN Current-Polarized Directional Elements.................................................4.19
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) ..........................................................4.20
Figure 4.9 Negative-Sequence Voltage-Polarized Directional Element for Neutral-Ground and
Residual-Ground Overcurrent Elements...........................................................................4.21
Figure 4.10 Zero-Sequence Voltage-Polarized Directional Element .......................................................4.22
Figure 4.11 Channel IN Current-Polarized Directional Element.............................................................4.23
Figure 4.12 Zero-Sequence Voltage-Polarized Directional Element
(Low-Impedance Grounded Systems)...............................................................................4.24
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xiList of Figures
Date Code 20080213 Instruction Manual SEL-351A Relay
Figure 4.13 Wattmetric and Incremental Conductance Directional Elements
(Petersen Coil Grounded Systems)................................................................................... 4.25
Figure 4.14 Zero-Sequence Voltage-Polarized Directional Element (Ungrounded/High-Impedance
Grounded Systems)........................................................................................................... 4.26
Figure 4.15 Routing of Directional Elements to Residual-Ground Overcurrent Elements..................... 4.27
Figure 4.16 Routing of Direction Elements to Neutral-Ground Overcurrent Elements.......................... 4.27
Figure 4.17 Direction Forward/Reverse Logic for Residual-Ground Overcurrent Elements.................. 4.28
Figure 4.18 Direction Forward/Reverse Logic for Neutral-Ground Overcurrent Elements.................... 4.29
Figure 4.19 General Logic Flow of Directional Control for Negative-Sequence
and Phase Overcurrent Elements ...................................................................................... 4.30
Figure 4.20 Negative-Sequence Voltage-Polarized Directional Element for Negative-Sequence
and Phase Overcurrent Elements ...................................................................................... 4.33
Figure 4.21 Positive-Sequence Voltage-Polarized Directional
Element for Phase Overcurrent Elements......................................................................... 4.34
Figure 4.22 Routing of Directional Elements to Negative-Sequence and Phase Overcurrent Elements. 4.35
Figure 4.23 Direction Forward/Reverse Logic for Negative-Sequence Overcurrent Elements .............. 4.36
Figure 4.24 Direction Forward/Reverse Logic for Phase Overcurrent Elements .................................... 4.37
Figure 4.25 Zero-Sequence Impedance Network and Relay Polarity ..................................................... 4.47
Figure 4.26 Zero-Sequence Impedance Plot for Solidly-Grounded, Mostly Inductive System .............. 4.47
Figure 4.27 Zero-Sequence Impedance Network for Ground Fault on Feeder ....................................... 4.51
Figure 4.28 Wattmetric Element Operation for Ground Fault on Feeder................................................ 4.52
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)................................. 5.7
Figure 5.4 Seal-in of Breaker Failure Occurrence for Message Display............................................... 5.13
Figure 6.1 Close Logic ............................................................................................................................ 6.2
Figure 6.2 Reclose Supervision Logic (Following Open Interval Time-Out) ......................................... 6.5
Figure 6.3 Reclose Supervision Limit Timer Operation (Refer to Bottom of Figure 6.2) ...................... 6.6
Figure 6.4 SEL-351A Relays Installed at Both Ends of a Transmission Line
in a High-Speed Reclose Scheme....................................................................................... 6.9
Figure 6.5 Reclosing Relay States and General Operation.................................................................... 6.13
Figure 6.6 Reclosing Sequence From Reset to Lockout With Example Settings.................................. 6.16
Figure 6.7 Reclose Blocking for Islanded Generator ............................................................................ 6.24
Figure 6.8 Sequence Coordination Between the SEL-351A and a Line Recloser ................................ 6.27
Figure 6.9 Operation of SEL-351A Shot Counter for Sequence Coordination
With Line Recloser (Additional Settings Example 1) ...................................................... 6.27
Figure 6.10 Operation of SEL-351A Shot Counter for Sequence Coordination
With Line Recloser (Additional Settings Example 2) ...................................................... 6.29
Figure 7.1 Example Operation of Optoisolated Inputs IN101–IN106 .................................................... 7.2
Figure 7.2 Circuit Breaker Auxiliary Contact and Reclose Enable Switch
Connected to Optoisolated Inputs IN101 and IN102 ......................................................... 7.3
Figure 7.3 Local Control Switches Drive Local Bits LB1–LB16 ........................................................... 7.5
Figure 7.4 Local Control Switch Configured as an ON/OFF Switch...................................................... 7.6
Figure 7.5 Local Control Switch Configured as an OFF/MOMENTARY Switch .................................. 7.6
Figure 7.6 Local Control Switch Configured as an ON/OFF/MOMENTARY Switch ........................... 7.6
Figure 7.7 Configured Manual Trip Switch Drives Local Bit LB3......................................................... 7.7
Figure 7.8 Configured Manual Close Switch Drives Local Bit LB4....................................................... 7.7
Figure 7.9 Remote Control Switches Drive Remote Bits RB1–RB16 .................................................... 7.9
Figure 7.10 Traditional Latching Relay................................................................................................... 7.11
Figure 7.11 Latch Control Switches Drive Latch Bits LT1–LT16........................................................... 7.11
Figure 7.12 SCADA Contact Pulses Input IN104 to Enable/Disable Reclosing Relay .......................... 7.12
Figure 7.13 Latch Control Switch Controlled by a Single Input to Enable/Disable Reclosing .............. 7.12
Figure 7.14 Latch Control Switch Operation Time Line......................................................................... 7.14
Figure 7.15 Time Line for Reset of Latch Bit LT2 After Active Setting Group Change ........................ 7.15
Figure 7.16 Latch Control Switch (With Time Delay Feedback) Controlled
by a Single Input to Enable/Disable Reclosing ................................................................ 7.16
Figure 7.17 Latch Control Switch (With Time Delay Feedback) Operation Time Line ......................... 7.17
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xii List of Figures
SEL-351A Relay Instruction Manual Date Code 20080213
Figure 7.18 SCADA Contact Pulses Input IN105 to Switch Active Setting Group Between
Setting Groups 1 and 4......................................................................................................7.20
Figure 7.19 SELOGIC Control Equation Variable Timer SV8T Used in Setting Group Switching.........7.20
Figure 7.20 Active Setting Group Switching (With Single Input) Time Line .........................................7.22
Figure 7.21 Rotating Selector Switch Connected to Inputs IN101, IN102, and IN103 for
Active Setting Group Switching .......................................................................................7.23
Figure 7.22 Active Setting Group Switching (With Rotating Selector Switch) Time Line.....................7.25
Figure 7.23 SELOGIC Control Equation Variables/Timers SV1/SV1T–SV6/SV6T................................7.27
Figure 7.24 SELOGIC Control Equation Variables/Timers SV7/SV7T–SV16/SV16T............................7.28
Figure 7.25 Dedicated Breaker Failure Scheme Created With SELOGIC
Control Equation Variables/Timers...................................................................................7.29
Figure 7.26 Logic Flow for Example Output Contact Operation ............................................................7.33
Figure 7.27 Traditional Panel Light Installations.....................................................................................7.34
Figure 7.28 Rotating Default Display Replaces Traditional Panel Light Installations............................7.35
Figure 8.1 Plotted Breaker Maintenance Points for a 25 kV Circuit Breaker..........................................8.3
Figure 8.2 SEL-351A 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 ....................................8.14
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 .......8.25
Figure 9.1 U.S. Moderately Inverse Curve: U1 .......................................................................................9.6
Figure 9.2 U.S. Inverse Curve: U2...........................................................................................................9.7
Figure 9.3 U.S. Very Inverse Curve: U3 ..................................................................................................9.8
Figure 9.4 U.S. Extremely Inverse Curve: U4 .........................................................................................9.9
Figure 9.5 U.S. Short-Time Inverse Curve: U5......................................................................................9.10
Figure 9.6 I.E.C. Class A Curve (Standard Inverse): C1 .......................................................................9.11
Figure 9.7 I.E.C. Class B Curve (Very Inverse): C2 ..............................................................................9.12
Figure 9.8 I.E.C. Class C Curve (Extremely Inverse): C3 .....................................................................9.13
Figure 9.9 I.E.C. Long-Time Inverse Curve: C4....................................................................................9.14
Figure 9.10 I.E.C. Short-Time Inverse Curve: C5 ...................................................................................9.15
Figure 9.11 Operation of DELTA and 3V0 Relay Word Bits ..................................................................9.38
Figure 9.12 Hybrid Power System With Neutral-Ground Resistor..........................................................9.40
Figure 10.1 DB-9 Connector Pinout for EIA-232 Serial Ports ................................................................10.2
Figure 11.1 Front-Panel Pushbuttons—Overview ...................................................................................11.2
Figure 11.2 Front-Panel Pushbuttons—Primary Functions .....................................................................11.3
Figure 11.3 Front-Panel Pushbuttons—Primary Functions (continued)..................................................11.4
Figure 11.4 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 12.1 Example Event Summary .....................................................................................................12.4
Figure 12.2 Example Synchrophasor-Level Precise Event Report 1/16-Cycle Resolution .....................12.8
Figure 12.3 Example Standard 15-Cycle Event Report 1/4-Cycle Resolution (Wye-Connected PTs) .12.26
Figure 12.4 Example Partial Event Report with Delta-Connected PTs .................................................12.27
Figure 12.5 Derivation of Event Report Current Values and RMS Current Values From
Sampled Current Waveform............................................................................................12.28
Figure 12.6 Derivation of Phasor RMS Current Values From Event Report Current Values ................12.29
Figure 12.7 Example Sequential Events Recorder (SER) Event Report................................................12.30
Figure 13.1 Low-Level Test Interface (J1 or J10) Connector ..................................................................13.6
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xiiiList of Figures
Date Code 20080213 Instruction Manual SEL-351A Relay
Figure B.1 Establishing a Connection......................................................................................................B.4
Figure B.2 Determining the Computer Serial Port...................................................................................B.4
Figure B.3 Determining Communications Parameters for the Computer ................................................B.5
Figure B.4 Setting Terminal Emulation ...................................................................................................B.5
Figure B.5 Terminal Emulation Startup Prompt ......................................................................................B.6
Figure B.6 Correcting the Port Setting.....................................................................................................B.6
Figure B.7 Correcting the Communications Parameters..........................................................................B.7
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.11
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.13
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.20
Figure B.18 Alternate Method of Establishing an FTP Connection ........................................................B.21
Figure B.19 Read (Open) File ..................................................................................................................B.21
Figure B.20 Page Cannot Be Displayed Window ....................................................................................B.22
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.7
Figure G.2 Result of Falling-Edge Operator on a Deasserting Underfrequency Element ...................... G.8
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
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Date Code 20080213 Instruction Manual SEL-351A Relay
Preface
Manual Overview
The SEL-351A Instruction Manual describes common aspects of protection
relay application and use. It includes the necessary information to install, set,
test, and operate the relay and more detailed information about settings and
commands. The SEL-351A features include directional elements, load
encroachment, synchronism check, station batter monitor, and sensitive earth
fault functionality. The SEL-351A-1 model is a non-directional three-voltage
version of the SEL-351A. Throughout the manual, notes indicate where
features are not available in the SEL-351A-1.
An overview of each manual section and topics follows:
Preface. Describes the manual organization and conventions used to
present information.
Section 1: Introduction and Specifications. Describes the basic features
and functions of the SEL-351A; lists the relay specifications.
Section 2: Installation.Describes how to mount and wire the SEL-351A;
illustrates wiring connections for various applications; describes
operation of current board jumpers; and depicts relay front and rear
panels.
Section 3: Overcurrent, Voltage, Synchronism Check, and Frequency Ele-
ments. Describes the operation of the 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; and
frequency elements.
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, including directional control for low-impedance
grounded, Petersen Coil grounded, and ungrounded/high-impedance
grounded systems; 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, and front-panel target LEDs.
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, 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 available), programmable timers
(timer outputs SV1T–SV16T), output contacts OUT101–OUT107 and
ALARM, and rotating default displays.
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xvi
SEL-351A Relay Instruction Manual Date Code 20080213
Preface
Section 8: Breaker Monitor and Metering. Describes the operation of the
breaker monitor and demand, energy, and maximum/minimum
metering.
Section 9: Setting the Relay. Explains how to enter settings and also
contains the following setting reference information:
➤Time-overcurrent curves (5 US and 5 IEC curves)
➤Relay Word bit table and definitions (Relay Word bits are used
in SELOGIC®control equation settings)
➤Settings Sheets for general relay, SELOGIC control equation,
global, SER, text label, and serial port settings
There are settings sheets for the SEL-351A and SEL-351A-1 relays.
These settings sheets can be photocopied and filled out to set the
SEL-351A or SEL-351A-1. 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 10.25 for a list of
the factory default settings the SEL-351A ships within a standard relay
shipment.
SEL-351A Command Summary.Briefly describes the serial port commands
that are described in detail in Section 10: Serial Port Communications
and Commands.
Section 11: Front-Panel Interface (Only on Models With LCD). Describes the
front-panel operation of pushbuttons and their correspondence to serial
port commands, local control switches (local bit outputs LB1–LB16),
and rotating default displays.
Section 12: Standard Event Reports and SER. Describes standard 15- and
30-cycle event reports and sequential events recorder (SER) report.
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: 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: Using the SEL-251 and SEL-267 Relay Settings in
the SEL-351A Relay
➤Appendix J: SEL-351A Fast SER Protocol
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xvii
Date Code 20080213 Instruction Manual SEL-351A Relay
Preface
➤Appendix K: ACSELERATOR QuickSet SEL-5030 Software (not
available in the SEL-351A-1)
➤Appendix L: SEL Synchrophasors
SEL-351A Command Summary. Summarizes the serial port commands that
are fully described in Section 10: Serial Port Communications
and Commands.
Conventions
Typographic
Conventions
There are three ways to communicate with the SEL-351A:
➤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.
Examples This instruction manual uses several example illustrations and instructions to
explain how to effectively operate the SEL-351A. 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-351A.
Typographic Conventions
Example Description
STATUS Commands typed at a command line interface on a PC.
<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 and relay responses visible on
the PC screen.
The > character indicates submenus.
SELOGIC®Control
Equations
SEL trademarks and registered trademarks contain
the appropriate symbol on first reference in a section. In the
SEL-351A Instruction Manual, certain SEL trademarks appear
in small caps. These include SELOGIC control equations.
Modbus®Registered trademarks of other companies
include the registered trademark symbol with
the first occurrence of the term in a section.
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xviii
SEL-351A Relay Instruction Manual Date Code 20080213
Preface
Safety Information This manual uses three kinds of hazard statements, formatted as follows:
Indicates a potentially hazardous
situation that, if not avoided, may
result in minor or moderate injury or
equipment damage.
!
CAUTION
Indicates a potentially hazardous
situation that, if not avoided, could
result in death or serious injury.
!
WARNING
Indicates an imminently hazardous
situation that, if not avoided, will
result in death or serious injury.
!
DANGER
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