Schweitzer engineering laboratories Sel-351-5 User manual

20070117

SEL-351-5, -6, -7 Relay

Directional Overcurrent Relay

Reclosing Relay

Fault Locator

Integration Element Standard

Instruction Manual

*PM351-02-NB*

SEL-351-5, -6, -7 Relay Instruction Manual Date Code 20070117

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

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. PM351-02

Date Code 20070117 Instruction Manual SEL-351-5, -6, -7 Relay

Table of Contents

List of Tables ........................................................................................................................................................ v

List of Figures.................................................................................................................................................... vii

Preface.................................................................................................................................................................xiii

Section 1: Introduction and Specifications

SEL-351 Models.............................................................................................................................................. 1.2

Applications..................................................................................................................................................... 1.5

Hardware Connection Features ....................................................................................................................... 1.6

Communications Connections....................................................................................................................... 1.12

Specifications ................................................................................................................................................ 1.13

Section 2: Installation

Overview ......................................................................................................................................................... 2.1

Relay Mounting............................................................................................................................................... 2.2

Front-Panel and Rear-Panel Connection Diagrams......................................................................................... 2.4

Making Rear-Panel Connections..................................................................................................................... 2.8

AC/DC Connection Diagrams for Various Applications............................................................................... 2.19

Circuit Board Connections ............................................................................................................................ 2.33

Section 3: Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements

Instantaneous/Definite-Time Overcurrent Elements ....................................................................................... 3.1

Time-Overcurrent Elements .......................................................................................................................... 3.15

Voltage Elements ........................................................................................................................................... 3.25

Synchronism Check Elements....................................................................................................................... 3.33

Frequency Elements ...................................................................................................................................... 3.46

Voltage Sag, Swell, and Interruption Elements (Available in Firmware Version 7) ..................................... 3.51

Power Elements (Available in Firmware Version 7) ..................................................................................... 3.56

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 ............................................. 4.30

Directional Control Settings.......................................................................................................................... 4.38

Directional Control Provided by Torque Control Settings ............................................................................ 4.57

Section 5: Trip and Target Logic

Trip Logic ........................................................................................................................................................ 5.1

Switch-Onto-Fault (SOTF) Trip Logic............................................................................................................ 5.7

Communications-Assisted Trip Logic—General Overview.......................................................................... 5.10

Permissive Overreaching Transfer Trip (POTT) Logic ................................................................................. 5.14

Directional Comparison Unblocking (DCUB) Logic.................................................................................... 5.20

Directional Comparison Blocking (DCB) Logic........................................................................................... 5.26

Front-Panel Target LEDs............................................................................................................................... 5.31

Section 6: Close and Reclose Logic

Close Logic...................................................................................................................................................... 6.2

Reclose Supervision Logic .............................................................................................................................. 6.5

Reclosing Relay............................................................................................................................................. 6.12

Section 7: Inputs, Outputs, Timers, and Other Control Logic

Optoisolated Inputs.......................................................................................................................................... 7.2

Local Control Switches ................................................................................................................................... 7.6

SEL-351-5, -6, -7 Relay Instruction Manual Date Code 20070117

Table of Contents

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

Overview..........................................................................................................................................................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

Synchrophasor Metering................................................................................................................................8.32

Load Profile Report (Available in

Firmware Versions 6 and 7).........................................................................................................................8.33

Section 9: Setting the Relay

Overview..........................................................................................................................................................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)...............................................................................9.17

Settings Explanations.....................................................................................................................................9.37

Settings Sheets ...............................................................................................................................................9.45

SET: 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-351-5, -6, -7 Relay Command Summary

Section 11: Front-Panel Interface

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, Sag/Swell/Interruption Report, 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 ...................................................................................12.32

Sag/Swell/Interruption (SSI) Report (Available in Firmware Version 7) ....................................................12.34

Section 13: Testing and Troubleshooting

Overview........................................................................................................................................................13.1

Testing Philosophy.........................................................................................................................................13.2

Testing Methods and Tools ............................................................................................................................13.4

Relay Self-Tests .............................................................................................................................................13.8

Relay Troubleshooting.................................................................................................................................13.10

iii

Date Code 20070117 Instruction Manual SEL-351-5, -6, -7 Relay

Table of Contents

Relay Calibration......................................................................................................................................... 13.11

Factory Assistance....................................................................................................................................... 13.12

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.1

Ethernet Port Firmware Upgrade Instructions...............................................................................................B.17

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

Overview .........................................................................................................................................................E.1

CASCII Command—General Format .............................................................................................................E.2

CASCII Command—SEL-351........................................................................................................................E.4

CSTATUS Command—SEL-351 ....................................................................................................................E.5

CHISTORY Command—SEL-351 .................................................................................................................E.6

CEVENT Command—SEL-351 .....................................................................................................................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

Appendix I: MIRRORED BITS (in Firmware Versions 6 and 7)

Overview ..........................................................................................................................................................I.1

Operation ..........................................................................................................................................................I.2

MIRRORED BITS Protocol for the Pulsar 9600 Baud Modem ...........................................................................I.5

Settings .............................................................................................................................................................I.6

SEL-351-5, -6, -7 Relay Instruction Manual Date Code 20070117

Table of Contents

Appendix J: SEL-351 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 Software ...................................................................................................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-351-5, -6, -7 Relay Command Summary

Date Code 20070117 Instruction Manual SEL-351-5, -6, -7 Relay

List of Tables

Table 1.1 SEL-351 Models .................................................................................................................... 1.2

Table 1.2 SEL-351 Firmware Versions .................................................................................................. 1.3

Table 2.1 Communication Cables to Connect the SEL-351 to Other Devices .................................... 2.18

Table 2.2 Output Contact Jumpers and Corresponding Output Contacts ............................................ 2.37

Table 2.3 “Extra Alarm” Output Contacts and Corresponding Controlling Jumpers.......................... 2.37

Table 2.4 Required Position of Jumper JMP23 for Desired Output Contact

OUT107 Operation (Models 0351x0, 0351x1, and 0351xY) ............................................. 2.38

Table 2.5 Password and Breaker Jumper Positions for Standard Relay Shipments............................. 2.38

Table 2.6 Password and Breaker Jumper Operation ............................................................................ 2.38

Table 2.7 EIA-232 Serial Port Voltage Jumper Positions for Standard Relay Shipments ................... 2.39

Table 3.1 Available Phase Time-Overcurrent Elements....................................................................... 3.15

Table 3.2 Phase Time-Overcurrent Element (Maximum Phase) Settings............................................ 3.15

Table 3.3 Phase Time-Overcurrent Element (Maximum Phase) Logic Outputs.................................. 3.16

Table 3.4 Neutral Ground Time-Overcurrent Element Settings........................................................... 3.21

Table 3.5 Residual Ground Time-Overcurrent Element Settings......................................................... 3.23

Table 3.6 Negative-Sequence Time-Overcurrent Element Settings..................................................... 3.24

Table 3.7 Voltage Values Used by Voltage Elements........................................................................... 3.25

Table 3.8 Voltage Elements Settings and Settings Ranges (Wye-Connected PTs).............................. 3.25

Table 3.9 Voltage Elements Settings and Settings Ranges (VS Channel) ........................................... 3.27

Table 3.10 Voltage Elements Settings and Settings Ranges (Delta-Connected PTs)............................. 3.27

Table 3.11 Synchronism Check Elements Settings and Settings Ranges .............................................. 3.33

Table 3.12 Frequency Elements Settings and Settings Ranges.............................................................. 3.48

Table 3.13 Sag/Swell/Interruption Elements Settings (must first set ESSI = Y)................................... 3.52

Table 3.14 Single-Phase Power Element Settings and Setting Ranges (EPWR = 1, 2, 3, or 4) ............ 3.56

Table 3.15 Three-Phase Power Element Settings and Setting Ranges

(EPWR = 3P1, 3P2, 3P3, or 3P4) ....................................................................................... 3.56

Table 4.1 Available Ground Directional Elements............................................................................... 4.11

Table 4.2 Best Choice Ground Directional™ 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 Through 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 Front-Panel Target LED Definitions .................................................................................... 5.31

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 ......................................................... 6.19

Table 6.5 Open Interval Time Example Settings ................................................................................. 6.24

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 Through SG6 ....... 7.19

Table 7.4 Definitions for Active Setting Group Switching SELOGIC Control Equation

Settings SS1 Through SS6 .................................................................................................. 7.19

Table 7.5 SELOGIC Control Equation Settings for Switching Active Setting Group

Between Setting Groups 1 and 4......................................................................................... 7.21

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

vi List of Tables

SEL-351-5, -6, -7 Relay Instruction Manual Date Code 20070117

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 ......................................................................8.4

Table 8.3 Demand Meter Settings and Settings Range ........................................................................8.24

Table 8.4 Operation of Maximum/Minimum Metering With Directional Power Quantities ...............8.30

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 SEL-351-5, -6, -7 Relay Word Bits ......................................................................................9.17

Table 9.6 Relay Word Bit Definitions for SEL-5, -6, -7.......................................................................9.19

Table 9.7 Main Relay Functions That Change With VSCONN, When PTCONN = WYE .................9.40

Table 9.8 Main Relay Functions That Change With VSCONN, When PTCONN = DELTA..............9.41

Table 9.9 Main Relay Functions That Change With VNOM = OFF....................................................9.42

Table 10.1 Models and 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-351 Relay Word and Its Correspondence to TAR Command.....................................10.33

Table 10.8 SEL-351 Control Subcommands ........................................................................................10.38

Table 10.9 Valid Password Characters .................................................................................................10.41

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.....................12.11

Table 12.4 SSI Element Status Columns..............................................................................................12.35

Table 12.5 Status SSI Column..............................................................................................................12.35

Table 13.1 Helpful Commands for Relay Testing ..................................................................................13.4

Table 13.2 Resultant Scale Factors for Input Module ............................................................................13.5

Table 13.3 Relay Self Tests ....................................................................................................................13.8

Table 13.4 Troubleshooting Procedure.................................................................................................13.10

Table A.1 Firmware Revision History....................................................................................................A.1

Table A.2 Instruction Manual Revision History.....................................................................................A.7

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 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 A5EO 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 for Different SEL-351 Models...............G.11

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-351 DNP3 Device Profile..............................................................................................H.7

Table H.5 SEL-351 DNP Object Table ..................................................................................................H.9

Table H.6 SEL-351 DNP Data Map .....................................................................................................H.14

viiList of Tables

Date Code 20070117 Instruction Manual SEL-351-5, -6, -7 Relay

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 Error Types Reported by the Communications Report ...........................................................I.3

Table J.1 Function Code 01 Message Format.........................................................................................J.4

Table J.2 Function Code 02 Message Format.........................................................................................J.5

Table J.3 Function Code 18 Message Format.........................................................................................J.5

Table J.4 Acknowledge Message Format ...............................................................................................J.7

Table J.5 SEL-351 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-351 Global Settings for Synchrophasors .......................................................................L.8

Table L.6 SEL-351 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 20070117 Instruction Manual SEL-351-5, -6, -7 Relay

List of Figures

Figure 1.1 SEL-351 Relays Applied Throughout the Power System...................................................... 1.5

Figure 1.2 Inputs, Outputs, and Communications Ports (Models 0351x0, 0351x1, and 0351xY;

Models 0351x1 and 0351xY Have an Extra I/O Board—See Figure 1.3 and Figure 1.4)1.7

Figure 1.3 Extra I/O Board (Model 0351xY, Plug-In Connector Version; Main Board Shown

in Figure 1.2) ...................................................................................................................... 1.9

Figure 1.4 Extra I/O Board (Model 0351x1, Screw-Terminal Block Version; Main Board Shown

in Figure 1.2) .................................................................................................................... 1.11

Figure 1.5 Communications Connections Examples............................................................................. 1.12

Figure 2.1 Dimensions for Rack-Mount and Panel-Mount Models ........................................................ 2.3

Figure 2.2 Front- and Rear-Panel Drawings—Model 0351x0 Rear and Model 0351x0H Front;

Horizontal Rack-Mount Example....................................................................................... 2.5

Figure 2.3 Front- and Rear-Panel Drawings—Model 0351x1xxxxx2 Rear and Models 0351x1H

and 0351xYH Front; Horizontal Rack-Mount Example .................................................... 2.6

Figure 2.4 Front- and Rear-Panel Drawings—Model 0351xYxxxxx6 Rear and Models 0351x14

and 0351xY4 Front; Vertical Panel-Mount Example ......................................................... 2.7

Figure 2.5 Plug-In Connector Coding (Top View; Model 0351xY)........................................................ 2.9

Figure 2.6 Broken-Delta Secondary Connection to Voltage Input VS, Wye-Connected PTs ............... 2.15

Figure 2.7 Resultant Voltage VSfrom the Collapse of Voltage VAin the Broken-Delta Secondary

(Compared to the Wye-Connected Power System Voltages)............................................ 2.16

Figure 2.8 Broken-Delta Secondary Connection to Voltage Input VS, Delta-Connected PTs.............. 2.16

Figure 2.9 Resultant Voltage VSfrom the Collapse of Voltage VAin the Broken-Delta Secondary

(Compared to the Delta-Connected Power System Voltages) .......................................... 2.17

Figure 2.10 Utility Distribution Feeder Overcurrent Protection and Reclosing (Includes Fast Bus Trip

Scheme) (Wye-Connected PTs)........................................................................................ 2.19

Figure 2.11 Distribution Bus Overcurrent Protection (Includes Fast Bus Trip Scheme)

(Wye-Connected PTs)....................................................................................................... 2.20

Figure 2.12 Transmission Line Directional Overcurrent Protection and Reclosing

(Wye Connected PTs) ....................................................................................................... 2.21

Figure 2.13 Transmission Line Directional Overcurrent Protection and Reclosing

(Current-Polarization Source Connected to Channel IN) (Wye-Connected PTs) ............ 2.22

Figure 2.14 Delta Wye Transformer Bank Overcurrent Protection (Wye-Connected PTs) .................... 2.23

Figure 2.15 Overcurrent Protection for a Transformer Bank With a Tertiary Winding

(Wye-Connected PTs)....................................................................................................... 2.24

Figure 2.16 Industrial Distribution Feeder Overcurrent Protection (Core-Balance Current

Transformer Connected to Channel IN) ........................................................................... 2.25

Figure 2.17 Dedicated Breaker Failure Protection ..................................................................................2.26

Figure 2.18 Overcurrent Protection for a High-Impedance or Low-Impedance Grounded System

(Wye-Connected PTs)....................................................................................................... 2.27

Figure 2.19 Petersen Coil-Grounded System Overcurrent Protection (Wye-Connected PTs) ................ 2.28

Figure 2.20 Ungrounded System Overcurrent Protection (Wye-Connected PTs)................................... 2.29

Figure 2.21 Ungrounded System Overcurrent Protection (Delta-Connected PTs,

Broken-Delta 3V0 Connection)........................................................................................ 2.30

Figure 2.22 Utility Distribution Feeder Overcurrent Protection and Reclosing (Delta Connected PTs

and Line-to-Ground Synchronism Check Connection) .................................................... 2.31

Figure 2.23 Utility Distribution Feeder Underfrequency Load Shedding, Overcurrent Protection,

and Reclosing (Single Voltage Connection) ..................................................................... 2.32

Figure 2.24 Jumper, Connector, and Major Component Locations on the Main Board

(Models 0351x0, 0351x1, and 0351xY)........................................................................... 2.34

Figure 2.25 Jumper, Connector, and Major Component Locations on the Extra I/O Board

(Models 0351xY, Plug-In Connector Version) ................................................................. 2.35

Figure 2.26 Jumper, Connector, and Major Component Locations on the Extra I/O Board

(Model 0351x1, Screw-Terminal Block Version)............................................................. 2.36

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

viii List of Figures

SEL-351-5, -6, -7 Relay Instruction Manual Date Code 20070117

Figure 3.3 Levels 1 Through 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 Nondirectional Instantaneous Overcurrent Element Pickup Time Curve...............................3.6

Figure 3.6 Nondirectional Instantaneous Overcurrent Element Reset Time Curve.................................3.7

Figure 3.7 Levels 1 Through 4 Phase-to-Phase Instantaneous Overcurrent Elements ............................3.8

Figure 3.8 Levels 1 Through 4 Neutral Ground Instantaneous/Definite-Time Overcurrent

Elements (With Directional Control Option)......................................................................3.9

Figure 3.9 Levels 5 Through 6 Neutral Ground Instantaneous Overcurrent Elements............................3.9

Figure 3.10 Levels 1 Through 4 Residual Ground Instantaneous/Definite-Time Overcurrent

Elements (With Directional Control Option)....................................................................3.11

Figure 3.11 Levels 5 Through 6 Residual Ground Instantaneous Overcurrent Elements........................3.11

Figure 3.12 Levels 1 Through 4 Negative-Sequence Instantaneous/Definite-Time Overcurrent

Elements (With Directional Control Option)....................................................................3.14

Figure 3.13 Levels 5 Through 6 Negative-Sequence Instantaneous Overcurrent Elements....................3.14

Figure 3.14 Phase Time-Overcurrent Element 51PT (With Directional Control Option) .......................3.16

Figure 3.15 A-Phase Time-Overcurrent Element 51AT (With Directional Control Option)...................3.19

Figure 3.16 B-Phase Time-Overcurrent Element 51BT (With Directional Control Option)...................3.20

Figure 3.17 C-Phase Time-Overcurrent Element 51CT (With Directional Control Option)...................3.20

Figure 3.18 Neutral Ground Time-Overcurrent Element 51NT (With Directional Control Option).......3.21

Figure 3.19 Residual Ground Time-Overcurrent Element 51GT (With Directional Control Option).....3.22

Figure 3.20 Negative-Sequence Time-Overcurrent Element 51QT (With Directional Control Option) .3.23

Figure 3.21 Single-Phase and Three-Phase Voltage Elements (Wye-Connected PTs) ............................3.28

Figure 3.22 Phase-to-Phase and Sequence Voltage Elements (Wye-Connected PTs) .............................3.29

Figure 3.23 Phase-to-Phase Voltage Elements (Delta-Connected PTs)...................................................3.30

Figure 3.24 Sequence Voltage Elements (Delta-Connected PTs) ............................................................3.30

Figure 3.25 Channel VS Voltage Elements (Wye- or Delta-Connected PTs)..........................................3.31

Figure 3.26 Synchronism Check Voltage Window and Slip Frequency Elements ..................................3.36

Figure 3.27 Synchronism Check Elements ..............................................................................................3.37

Figure 3.28 Angle Difference Between VPand VSCompensated by Breaker Close Time

(fP< fSand VPShown as Reference in This Example) ....................................................3.42

Figure 3.29 Undervoltage Block for Frequency Elements (Group Setting VNOM ≠OFF)....................3.46

Figure 3.30 Undervoltage Block for Frequency Elements (Group Setting VNOM = OFF)....................3.46

Figure 3.31 Levels 1 Through 6 Frequency Elements .............................................................................3.47

Figure 3.32 Voltage Sag Elements ...........................................................................................................3.51

Figure 3.33 Voltage Swell Elements ........................................................................................................3.52

Figure 3.34 Voltage Interruption Elements ..............................................................................................3.52

Figure 3.35 Vbase Tracking Example (Three-Phase Disturbance, Wye Connected) ..............................3.54

Figure 3.36 Single-Phase Power Elements Logic (+VARS Example Shown).........................................3.59

Figure 3.37 Three-Phase Power Elements Logic.....................................................................................3.60

Figure 3.38 Power Elements Operation in the Real/Reactive Power Plane.............................................3.60

Figure 3.39 SEL-351(B) Provides VAR Control for 9600 kVAR Capacitor Bank..................................3.61

Figure 3.40 Per Unit Setting Limits for Switching 9600 kVAR Capacitor Bank On- and Off-Line .......3.63

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

ixList of Figures

Date Code 20070117 Instruction Manual SEL-351-5, -6, -7 Relay

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

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 ..................................................... 4.48

Figure 4.26 Zero-Sequence Impedance Plot for Solidly-Grounded, Mostly Inductive System .............. 4.48

Figure 4.27 Zero-Sequence Impedance Network for Ground Fault on Feeder 1 .................................... 4.51

Figure 4.28 Wattmetric Element Operation for Ground Fault on Feeder 1............................................. 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 Communications-Assisted Tripping Scheme ....................................................................... 5.10

Figure 5.5 Permissive Input Logic Routing to POTT Logic.................................................................. 5.15

Figure 5.6 POTT Logic.......................................................................................................................... 5.17

Figure 5.7 Permissive Input Logic Routing to Trip Logic..................................................................... 5.18

Figure 5.8 Connections to Communications Equipment for a Two-Terminal Line POTT Scheme...... 5.19

Figure 5.9 Connections to Communications Equipment for a Three-Terminal Line POTT Scheme.... 5.19

Figure 5.10 DCUB Logic ........................................................................................................................ 5.23

Figure 5.11 Unblocking Block Logic Routing to Trip Logic .................................................................. 5.24

Figure 5.12 Connections to Communications Equipment for a Two-Terminal Line DCUB Scheme

(Setting ECOMM = DCUB1)........................................................................................... 5.24

Figure 5.13 Connections to Communications Equipment for a Three-Terminal Line DCUB Scheme

(Setting ECOMM = DCUB2)........................................................................................... 5.25

Figure 5.14 DCB Logic ........................................................................................................................... 5.28

Figure 5.15 Connections to Communications Equipment for a Two-Terminal Line DCB Scheme........ 5.29

Figure 5.16 Connections to Communications Equipment for a Three-Terminal Line DCB Scheme ..... 5.30

Figure 5.17 Seal-in of Breaker Failure Occurrence for Message Display............................................... 5.34

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-351 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-351 and a Line Recloser ................................... 6.27

Figure 6.9 Operation of SEL-351 Shot Counter for Sequence Coordination With Line Recloser

(Additional Settings Example 1) ...................................................................................... 6.28

xList of Figures

SEL-351-5, -6, -7 Relay Instruction Manual Date Code 20070117

Figure 6.10 Operation of SEL-351 Shot Counter for Sequence Coordination With Line Recloser

(Additional Settings Example 2).......................................................................................6.29

Figure 7.1 Example Operation of Optoisolated Inputs IN101–IN106 (Models 0351x0, 0351x1,

and 0351xY)........................................................................................................................7.2

Figure 7.2 Example Operation of Optoisolated Inputs IN201–IN208—

Extra I/O Board (Models 0351x1 and 0351xY)..................................................................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 Through 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 Through SV6/SV6T ................7.28

Figure 7.25 SELOGIC Control Equation Variables/Timers SV7/SV7T Through 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 (Models 0351x0, 0351x1,

and 0351xY)......................................................................................................................7.34

Figure 7.28 Logic Flow for Example Output Contact Operation—Extra I/O Board (Model 0351x1

and 0351xY)......................................................................................................................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 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 .......8.26

Figure 9.1 U.S. Moderately Inverse Curve: U1 .......................................................................................9.7

Figure 9.2 U.S. Inverse Curve: U2...........................................................................................................9.8

xiList of Figures

Date Code 20070117 Instruction Manual SEL-351-5, -6, -7 Relay

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 Operation of DELTA and 3V0 Relay Word Bits .................................................................. 9.41

Figure 9.12 Hybrid Power System With Neutral Ground Resistor ......................................................... 9.43

Figure 10.1 DB-9 Connector Pinout for EIA-232 Serial Ports................................................................ 10.2

Figure 10.2 SEL-351 to Computer, Cable C234A................................................................................... 10.3

Figure 10.3 SEL-351 to Computer, Cable C227A................................................................................... 10.3

Figure 10.4 SEL-351 to Modem.............................................................................................................. 10.3

Figure 10.5 SEL-351 to SEL-PRTU........................................................................................................ 10.4

Figure 10.6 SEL-351 to SEL-2032, SEL-2030, SEL-2020, or SEL-2100 .............................................. 10.4

Figure 10.7 SEL-351 to SEL-DTA2 ........................................................................................................ 10.4

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) . 12.28

Figure 12.4 Example Partial Event Report with Delta-Connected PTs................................................. 12.29

Figure 12.5 Derivation of Event Report Current Values and RMS Current Values

From Sampled Current Waveform.................................................................................. 12.30

Figure 12.6 Derivation of Phasor RMS Current Values From Event Report Current Values................ 12.31

Figure 12.7 Example Sequential Events Recorder (SER) Event Report ............................................... 12.32

Figure 12.8 Example Sag/Swell/Interruption (SSI) Report (PTCONN = WYE).................................. 12.41

Figure 12.9 Example Sag/Swell/Interruption (SSI) Report (PTCONN = DELTA)............................... 12.41

Figure 13.1 Low-Level Test Interface (J1 or J10) Connector.................................................................. 13.5

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.9

Figure B.11 Example Receive File Dialog Box .......................................................................................B.10

Figure B.12 Example Filename Identifying Old Firmware Version ........................................................B.10

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.12

Figure B.16 Preparing HyperTerminal for ID Command Display...........................................................B.16

Figure B.17 Establishing an FTP Connection..........................................................................................B.19

Figure B.18 Alternate Method of Establishing an FTP Connection ........................................................B.19

Figure B.19 Read (Open) File ..................................................................................................................B.20

Figure B.20 Page Cannot Be Displayed Window ....................................................................................B.20

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

xii List of Figures

SEL-351-5, -6, -7 Relay Instruction Manual Date Code 20070117

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 a 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 20070117 Instruction Manual SEL-351-5, -6, -7 Relay

Preface

UInstruction Manual

Manual Overview

The SEL-351-5, -6, -7 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.

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-351; lists the relay specifications.

Section 2: Installation. Describes how to mount and wire the SEL-351;

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, Frequency, and

Power Elements. 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; 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, 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, 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 (models 0351x0, 0351x1,

and 0351xY) and IN201–IN208 (models 0351x1 and 0351xY), 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),

xiv

SEL-351-5, -6, -7 Relay Instruction Manual Date Code 20070117

Preface

programmable timers (timer outputs SV1T–SV16T), output contacts

OUT101–OUT107 and ALARM (models 0351x0, 0351x1, and 0351xY) and

OUT201–OUT 212 (models 0351x1 and 0351xY), and rotating default

displays.

Section 8: Breaker Monitor, Metering, and Load Profile Functions.

Describes the operation of the breaker monitor; demand, energy,

maximum/minimum, and synchrophasor metering; and load profile

reporting (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 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

The SEL-351-5, -6, -7 Relay Settings Sheets can be photocopied and

filled out to set the SEL-351. Note that these sheets correspond to the

serial port SET commands listed in Ta ble 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 10.26 for a list of

the factory default settings the SEL-351 ships within a standard relay

shipment.

SEL-351-5, -6, -7 Relay 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. 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, 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: 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

Date Code 20070117 Instruction Manual SEL-351-5, -6, -7 Relay

Preface

➤Appendix I: MIRRORED BITS (in Firmware Versions 6 and 7)

➤Appendix J: SEL-351 Fast SER Protocol

➤Appendix K: ACSELERATOR QuickSet SEL-5030 Software

➤Appendix L: SEL Synchrophasors

SEL-351-5, -6, -7 Relay Command Summary.Summarizes the serial port

commands that are fully described in Section 10: Serial Port

Communications and Commands.

Page Numbering This manual shows page identifiers at the top of each page; see the figure

below.

Page Number Format

The page number appears at the outside edge of each page; a vertical bar

separates the page number from the page title block. The page numbers of the

SEL-351 Relay Instruction Manual are represented by the following building

blocks:

➤Section number

➤Actual page number in the particular section

The section title is at the top of the page title block, with the main subsection

reference in bold type underneath the section title.

Installation

Title Block Page Number

Making Rear-Panel Connections

2.13

xvi

SEL-351-5, -6, -7 Relay Instruction Manual Date Code 20070117

Preface

Conventions

Typographic

Conventions

There are three ways to communicate with the SEL-351:

➤Using a command line interface on a PC terminal emulation

window, such as Microsoft®HyperTerminal®

➤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-351. 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-351.

Typo graph ic Convent ion s

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-351 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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Table of contents

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