Schweitzer Engineering Laboratories SEL-351-5 User manual

SEL-351-5, -6, -7
DIRECTIONAL OVERCURRENT RELAY
RECLOSING RELAY
FAULT LOCATOR
INTEGRATION ELEMENT STANDARD
INSTRUCTION MANUAL
SCHWEITZER ENGINEERING LABORATORIES, INC.
2350 NE HOPKINS COURT
PULLMAN, WA USA 99163-5603
TEL: [phone] FAX: [phone]

!
CAUTION:The relay contains devices sensitive to
electrostatic discharge (ESD). When working on the
relay with front or top cover removed, work surfaces
and personnel must be properly grounded or
equipment damage may result.
!
ATTENTION!:Le relais contient des pièces
sensibles aux décharges électrostatiques(DES). Quand
on travaille sur le relais avec le panneau avant ou du
dessus enlevé, les surfaces de travail et le personnel
doivent être mis à la terre convenablement pour éviter
les dommages à l'équipement.
!
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.
!
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.
!
WARNING: 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.
!
ATTENTION!:Cet équipement 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 accès
non-autorisé à l'équipement pourrait être possible.
SEL décline toute responsabilité pour tout dommage
résultant de cet accès non-autorisé.
!
DANGER: Removal of relay front panel exposes
circuitry which may cause electrical shock that can
result in injury or death.
!
DANGER:Le retrait du panneau avant expose à la
circuiterie qui pourrait être la source de chocs
électriques pouvant entraîner des blessures ou la mort.
!
DANGER: Contact with instrument terminals may
cause electrical shock which can result in injury or
death.
!
DANGER: Le contact avec les bornes de l'
instrument peut causer un choc électrique pouvant
entraîner des blessures ou la mort.
The software (firmware), schematic drawings, relay commands, and relay messages are copyright protected by the United States Copyright Law and
International Treaty provisions. ll rights are reserved.
You may not copy, alter, disassemble, or reverse-engineer the software. You may not provide the software to any third party.
ll brand or product names appearing in this document are the trademark or registered trademark of their respective holders.
Schweitzer Engineering Laboratories, SELOGIC, Connectorized, Job Done, SEL-PROFILE, SEL-5030 CSELER TOR, and are registered trademarks of
Schweitzer Engineering Laboratories, Inc.
The English language manual is the only approved SEL manual.
Copyright © SEL 1999, 2000, 2001, 2002 ( ll rights reserved) Printed in US .
This product is covered by U.S. Patent Numbers: 5,041,737; 5,208,545; 5,317,472; 5,349,490; 5,365,396; 5,367,426; 5,479,315; 5,515,227; 5,602,707;
5,652,688; 5,694,281; 5,790,418; 5,793,750; 5,883,578 U.S. Patent(s) Pending, and Foreign Patent(s) Issued and Pending.
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 20020426 Manual Change Information i
SEL-351-5, -6, - Instruction Manual
MANUAL CHANGE INFORMATION
The date code at the bottom of each page of this manual reflects the creation or revision date.
Date codes are changed only on pages that have been revised and any following pages affected by
the revisions (i.e., pagination). If significant revisions are made to a section, the date code on all
pages of the section will be changed to reflect the revision date.
Each time revisions are made, both the main table of contents and the affected individual section
table of contents are regenerated and the date code is changed to reflect the revision date.
Changes in this manual to date are summarized below (most recent revisions listed at top).
Revision
Date Summary of Revisions
The Manual Change Information section has been created to begin a record of revisions to
this manual. All changes will be recorded in this Summary of Revisions table.
20020426 This revision includes the following changes:
− Reissued Entire Manual.
− The changes in this revision relate to the new global setting PTCONN that
allows the relay to be configured for either wye- or delta-connected PTs; new
global setting VSCONN that allows the relay to be configured for a
synchronism check or broken delta voltage input to the VS-NS terminals; new
setting range VNOM = OFF that causes the relay to disregard the loss-of-
potential logic for direction elements that use zero-sequence voltage as a
polarizing source when VSCONN = 3V0; and the new three-phase power
elements (SEL-351-7 only).
Section 1:
− Updated Table 1.2.
− Added subsection: Potential Transformer Connections.
− Added voltage input notes to Figure 1.2.
− Added AC Input Voltage and Metering specifications for open-delta
connected PTs.
Section 2:
− Updated Figure 2.1 to include projection panel-mount option.
− Added subsection: Determining Voltage Input Rating.
− Added subsection: Wye-Connected Voltages (Global Setting PTCONN =
WYE).
− Added subsection: Delta-Connected Voltages (Global setting PTCONN =
DELTA).
− Added subsection: Synchronism Check VS Connection (Global setting
VSCONN = VS).
− Added subsection: Broken-Delta VS Connection (Global setting VSCONN =
3V0).
− Added subsection: Polarity Check for VSCONN = 3V0

ii Manual Change Information Date Code 20020426
SEL-351-5, -6, - Instruction Manual
Revision
Date Summary of Revisions
− Added Figure 2.6 through Figure 2.9.
− Added Figure 2.21 through Figure 2.23.
Section 3:
− Added Table 3.9.
− Added Figure 3.23 and Figure 3.24.
− Updated subsection: Voltage Input VS Connected Phase-to-Phase or Beyond
Delta-Wye Transformer.
− Updated Table 3.10.
− Added Delta-connected voltages to subsection: Setting SYNCP.
− Added Delta-connected voltages to subsection: Setting Synchronism Check
Elements Voltage Inputs.
− Updated Figure 3.26 and Figure 3.27.
− Updated subsection: System Frequencies Determined from Voltages VA(or
VAB for Delta) and VS.
− Updated Figure 3.29.
− Added Figure 3.30.
− Updated subsection: Frequency Element Voltage Control.
− Updated Figure 3.32 through Figure 3.34, and accompanying text.
− Updated Table 3.12.
− Updated subsection: Positive-Sequence Reference Voltage, Vbase.
− Updated subsection: Vbase Initialization.
− Updated subsection: Vbase Tracking Range.
− Added Table 3.14.
− Added subsection: Power Element Time Delay Setting Considerations.
− Added subsection: Using Power Elements in the Relay Trip Equation.
− Added subsection: Single-Phase Power Element Calculations.
− Added subsection: Three-Phase Power Element Calculations.
Section 4:
− Updated Figure 4.1.
− Updated subsection: Loss-of-Potential Logic.
− Added Table 4.3 and related text.
− Added subsection: Zero-Sequence Voltage Sources.
− Updated Figure 4.6 (added Setting VNOM = OFF input).
− Updated Figure 4.7 and Figure 4.8 (added Relay Word bit 3V0 input).
− Updated Figure 4.12 through Figure 4.14.
− Updated Figure 4.15 and Figure 4.16 (added 32VE, 32NE, 3V0 Relay Word
inputs).

Date Code 20020426 Manual Change Information iii
SEL-351-5, -6, - Instruction Manual
Revision
Date Summary of Revisions
− Updated Figure 4.21 (added Setting VNOM = OFF input).
− Updated Figure 4.23 and Figure 4.24 (added Setting VNOM = OFF input).
− Updated subsection: 59RES - Wattmetric 3V0 Overvoltage Pickup (Petersen
Coil Grounded System).
− Updated subsection: 32WFP and 32WRP - Wattmetric Forward and Reverse
Pickups (Petersen Coil Grounded System).
− Added subsection: Settings Considerations for Petersen Coil Grounded
Systems.
− Added Table 4.5.
Section 5:
− Updated Figure 5.6 (added Delta-connected voltages).
− Added subsection: Using MIRRORED BITS™ to Implement Communications
Assisted Tripping Schemes.
Section 7:
− Added Table 7.8 through Table 7.11.
− Added subsection: Values Displayed for Incorrect Settings.
− Added subsection: Extra Details for Displaying Metering Values on the
Rotating Default Display.
− Added subsection: Extra Details for Displaying Breaker Wear Monitor
Quantities on the Rotating Default Display.
− Added subsection: Extra Details for Displaying Time-Overcurrent Elements
on the Rotating Default Display.
Section 8:
− Updated subsections: Demand Metering, Energy Metering, Maximum/
Minimum Metering, Load Profile Report (Available in Firmware Versions 6
and 7).
Section 9:
− Added subsection: In Some Applications, Make Global Settings (SET G)
First.
− Updated Table 9.3.
− Updated Table 9.4.
− Added subsection: Settings for Voltage Input Configuration.
− Added Table 9.5 through Table 9.7.
− Added Figure 9.11.
− Updated subsection: Potential Transformer Ratios and PT Nominal
Secondary Voltage Settings.
− Updated Settings Sheets 1, 2, 7, 8, 9, 10, 11, 14, 15, 24, 29.

iv Manual Change Information Date Code 20020426
SEL-351-5, -6, - Instruction Manual
Revision
Date Summary of Revisions
Section 10:
− Changed Unsolicited SER name to Fast Sequential Events Recorder (SER)
Protocol for consistency.
− Added Delta voltage information to subsection MET Command (Metering
Data).
− Updated the SHO G screen display in subsection SHO Command (Show/View
Settings) to include the new settings PTCONN and VSCONN.
− Updated TAR Commands in subsection TAR Command (Display Relay
Element Status) to include TAR ROW and TAR LIST and an example.
− Updated BRE W command to allow trip counters and accumulated interrupted
current values to be pre-loaded for each individual phase.
− Updated VER example printout in subsection VER Command.
Section 12:
− Updated subsection: Filtered and Unfiltered Event Reports.
− Added subsection: Unfiltered Event Reports With PTCONN = DELTA.
− Updated Table 12.2.
− Updated Table 12.3.
− Added Figure 12.3.
− Updated subsection: Sag/Swell/Interruption Report (Available in Firmware
Version 7).
− Updated Table 12.4.
− Added Figure 12.8.
Section 13:
− Added subsection: Using the Low-Level Test Interface when Global Setting
PTCONN=DELTA.
− Added subsection: Relay Meter Command Does Not Respond as Expected.
Appendix A:
− Added firmware details for R309.
− Updated firmware details for R306 and R307.
Appendix B:
− Updated Firmware Upgrade Instructions.
Appendix D:
− Updated A5C1 Fast Meter Configuration Block.
− Updated A5D1 Fast Meter Data Block.
− Updated A5D2/A5D3 Demand/Peak Demand Fast Meter Message.
− Updated ID Message.
− Updated DNA Message.

Date Code 20020426 Manual Change Information v
SEL-351-5, -6, - Instruction Manual
Revision
Date Summary of Revisions
Appendix E:
− Updated CASCII Command—SEL-351.
− Updated CEVENT Command—SEL-351.
Appendix G:
− Updated Table G.2 and Table G.3 to include the addition of new Relay Word
bits to the SEL-351 Relay.
Appendix H:
− Added Extended Mode DNP Operation and Settings Sheet.
− Revised Table H.3 SEL-351 DNP Data Map to reflect addition of extended
mode and delta PT configuration features.
20020122 This revision includes the following changes:
Appendix A:
− Updated Firmware Version information.
20011219 This revision includes the following changes:
− Reissued entire manual.
− Most of the following manual changes for this revision are due to the addition
of the 0.2 A nominal neutral channel (IN) current input option. This option
provides ground directional control for low-impedance grounded, Petersen
Coil grounded, and ungrounded/high-impedance grounded systems (see
Table 4.1).
Section 1:
− Added 300 Vac wye-connected voltage input information to Table 1.2:
SEL-351 Firmware Versions.
− Added information on the following to the General Specifications subsection:
0.2 A nominal neutral channel (IN) current input option, frequency tracking
with positive-sequence voltage V1(when VAnot available), 220 Vdc
optoisolated inputs, extended lower end of pickup setting range for residual
ground overcurrent elements, and changed meter specification for currents IA,
IB, and IC.
Section 2:
− Changed Figure 2.4 to a vertical panel-mount example.
− Added connection diagrams (Figures 2.14 through 2.16) for high-impedance
or low-impedance grounded, Petersen Coil grounded, and ungrounded
systems.

vi Manual Change Information Date Code 20020426
SEL-351-5, -6, - Instruction Manual
Revision
Date Summary of Revisions
Section 3:
− Added additional pickup setting ranges for neutral ground overcurrent
elements operating from the 0.2 A nominal neutral channel (IN) current input.
− Added lower pickup setting ranges for residual ground overcurrent elements.
− Added Relay Word bits SFAST and SSLOW to Figure 3.24 for indication of
relative speed of systems (fast or slow slip) on either side of an open breaker.
− Added frequency element time delay setting recommendation, below
Table 3.10.
Section 4:
− Added VNOM setting (and resultant V1GOOD Relay Word bit output) to
Figure 4.1 and explained certain thresholds in the loss-of-potential logic,
relative to setting VNOM.
− Extensive changes in the balance of this section, dealing with the addition of
ground directional elements for low-impedance grounded, Petersen Coil
grounded, and ungrounded/high-impedance grounded systems. Figures 4.4
and 4.5 and Tables 4.1 and 4.2 provide the general overview and references
for all these changes.
− Supervising LOP (loss-of-potential) logic is removed from directional element
Figures 4.9, 4.10, 4.11, 4.12, 4.14, and 4.20 and put into preceding internal
enable logic Figures 4.6, 4.7, and 4.8.
Section 5:
− Added information on fault-type targeting (A, B, C) for Petersen Coil
grounded, and ungrounded/high-impedance grounded systems.
Section 6:
− Added an additional condition for the reclosing relay going to the Lockout
State (new reclose initiation occurs during open interval timing; this feature
had always existed, just not documented).
Section 9:
− Added the following Relay Word bits to Table 9.3:
SSLOW, SFAST, V1GOOD, V0GAIN, INMET, ICMET, IBMET,
IAMET, GNDSW, 50NF, 50NR, 32NE, F32N, R32N, 32NF, 32NR,
F32W, R32W, F32C, R32C, NSA, NSB, and NSC
− Added following setting for all settings groups: VNOM.
− Added following directional settings for all settings groups [for 0.2 A nominal
neutral channel (IN) current input]:
50NFP, 50NRP, a0N, 59RES, 32WFP, 32WRP, and 32WD
− Added S, P, and U (for low-impedance grounded, Petersen Coil grounded, and
ungrounded/high-impedance grounded systems, respectively) to setting range
for setting ORDER.

Date Code 20020426 Manual Change Information vii
SEL-351-5, -6, - Instruction Manual
Revision
Date Summary of Revisions
Section 10:
− Added event-type options A, B, and C (for Petersen Coil grounded or
ungrounded/high-impedance grounded systems), under HIS command.
Section 12:
− Updated event report capacity in Introduction.
− Added event-type options A, B, and C (for Petersen Coil grounded or
ungrounded/high-impedance grounded systems) to Table 12.1.
− Added variable scaling for analog values in event reports.
− Added F32N/R32N and F32C/R32C for column 32NG in Table 12.3.
− Added information on using the SSI Recorder on Petersen Coil grounded or
ungrounded/high-impedance grounded systems.
Section 13:
− Added 0.2 A nominal neutral channel (IN) current input information for low-
level test interface.
− Revised low-level test interface information to more clearly explain scale
factors, especially with the addition of Table 13.1.
Appendix A:
− Updated Firmware Version information.
Appendix D:
− Updated A5C0 Relay Definition Block.
− Updated A5C1 Fast Meter Configuration Block.
− Updated A5D1 Fast Meter Data Block.
− Updated DNA command information.
Appendix E:
− Updated CAS Command.
Appendix G:
− Updated Table G.3: Processing Order of Relay Elements and Logic (Top to
Bottom).
20010307 This revision includes the following changes:
− Reissued Entire Manual.
− Added Caution, Danger, and Warning information to the back of the cover
page of the Manual.
− Replaced Standard Product Warranty page with warranty statement on cover
page.

viii Manual Change Information Date Code 20020426
SEL-351-5, -6, - Instruction Manual
Revision
Date Summary of Revisions
Section 1:
− Added Tightening Torque information to General Specifications.
− Updated Power Supply information to include medium range Power Supply
Specification.
− Added optoisolated input ratings for ac control signals to General
Specifications.
Section 2:
− Updated Optoisolated Inputs subsection to include ac input selection.
− Added condition of acceptability for North American Product Safety
Compliance.
− Added caution note to the Clock Battery subsection.
Section 3:
− Updated subsection Voltage Sag, Swell, and Interruption Elements
(Available in Firmware Version 7).
Section 5:
− Updated A, B, and C Target LEDS subsection.
− Added SELOGIC Control Equation Setting FAULT subsection.
Section 7:
− Added ac setting description to Input Debounce Timers subsection.
− Updated Make Latch Control Setting With Care and Make Active Setting
Group Switching Settings With Care subsections.
− Added subsections Displaying Metering Quantities on the Rotating Default
Display, Displaying Metering Values Example, Displaying Breaker Monitor
Output Information on the Rotating Default Display, and Displaying
Breaker Monitor Outputs Example.
Section 8:
− Updated Maximum/Minimum Metering subsection.
− Added phase-to-phase voltages to load profile recorder.
Section 9:
− Updated setting ranges for VINT, VSAG, and VSWELL on Settings Sheet 13.
− Added ac setting choice to optoisolated input timers on Setting Sheets 20 and
21.
− Added phase-to-phase voltages to LDLIST settings choices on Settings Sheet
22.

Date Code 20020426 Manual Change Information ix
SEL-351-5, -6, - Instruction Manual
Revision
Date Summary of Revisions
Section 10:
− Changed the HIS command information.
− Added MET X command description.
− Updated password information.
− Added warning note to the PAS Command (View/Change Passwords)
subsection.
− Updated Command Summary to include MET X, SSI R, and SSI T
commands.
Section 12:
− Updated event report capacity, and removed Table 12.1.
− Updated Make Sequential Events Recorder (SER) Settings with Care
subsection.
− Updated subsection Sag/Swell/Interruption (SSI) Report (Available in
Firmware Version 7).
Appendix A:
− Updated Firmware Version information.
Appendix B:
− Updated password information.
Appendix K:
− Added new Appendix K: SEL-5030 ACSELERATOR®Software.
20001006 This revision includes the following changes:
− Reissued entire manual.
Section 1:
− Corrected RFI and Interference Tests.
− Corrected phase angle accuracy of synchronism check elements.
Section 2:
− Replaced Figure 2.1.
− Added cable for SEL-DTA2 to Table 2.1.
− Added note to Table 2.6 (Fast Operate).
Section 3:
− Corrected setting range for 59Q in Table 3.8.
− Clarified description of synchronism check element logic.
− Expanded setting range for 27B81P in Table 3.10.
Section 4:
− Corrected loss-of-potential positive-sequence (V1) reset threshold.

x Manual Change Information Date Code 20020426
SEL-351-5, -6, - Instruction Manual
Revision
Date Summary of Revisions
Section 5:
− Corrected Figure 5.6.
Section 6:
− Corrected 79DTL factory default setting (Table 6.4).
Section 7:
− Added subsection Details on the Remote Control Switch MOMENTARY
Position.
− Corrected the number of local, latch, and remote bits to 16.
Section 8:
− Added qualifying statement about changing the LDAR setting.
Section 9:
− Expanded setting range for 27B81P on Settings Sheet 9.
− Corrected FP_TO setting range on Global Settings Sheet.
− Added description of MBT setting choice for port settings.
− Added AUTO = DTA setting choice to Port Settings Sheet.
Section 10:
− Added notes about powering-down the relay after setting the date or time.
− Added DTA2 compatibility information.
− Revised SEL-351-5, -6, -7 Command Summary.
Section 12:
− Added Table 12.1.
Appendix A:
− Updated Firmware Version information.
Appendix B:
− Added step 16 for Breaker Wear Monitor data.
Appendix D:
− Made changes to A5C0 Relay Definition Block.
− Updated ID Message.
Appendix G:
− Corrected Figures G.1 and G.2 for rising and falling edge operators.
− Corrected Table G.3.
Appendix H:
− Corrected spelling of DECPLA, DECPLV, and DECPLM settings for DNP.
− Corrected index error in Relay Summary Event Data subsection.

Date Code 20020426 Manual Change Information xi
SEL-351-5, -6, - Instruction Manual
Revision
Date Summary of Revisions
Appendix I:
− Added settings sheet for MIRRORED BITS™protocol.
Appendix J:
− Renamed Appendix.
20000106 This revision includes the following changes:
Section 1:
− Updated RFI and Interference Tests.
Section 2:
− Clarified Table 2.1.
Section 5:
− Added explanation to the Target Reset/Lamp Test Front-Panel Pushbutton
subsection to indicate that the targets cannot be reset when a TRIP condition is
still present.
Section 7:
− Corrected Display Point examples.
− Corrected subsection “Relay Disabled Momentarily During Active Setting
Group Change.”
Section 9:
− Corrected error in Relay Word bit description for 51G (Table 9.6).
Section 10:
− Added note to TAR R command description.
− Minor change to COP command description.
Section 11:
− Corrected Rotating Default Display example.
Section 12:
− Minor corrections to Table 12.3.
Appendix A:
− Updated Firmware Version information.
Appendix G:
− Added Target Logic to Table G.3.
991123 This revision includes the following changes:
Appendix H:
− Corrected documentation errors in DNP 3.00 Device Profile, page H-5.

xii Manual Change Information Date Code 20020426
SEL-351-5, -6, - Instruction Manual
Revision
Date Summary of Revisions
990827 This revision includes the following changes:
− Updated MIRRORED BITS™format throughout to reflect new trademark.
Section 3:
− Added explanation to the Synchronism Check Elements subsection for the
new angle setting option for the SYNCP (synchronizing phase) setting.
Synchronism check can now be accomplished for synchronism check voltage
input VS connected phase-to-phase or beyond a delta-wye transformer.
Setting SYNCP accounts for the constant angle difference between reference
voltage VA and synchronism check voltage input VS.
Section 9:
− Expanded the setting range for the SYNCP (synchronizing phase) setting to
accommodate compensation angle settings for synchronism check (Settings
Sheet 9 of 24).
− Added the MB8A and MB8B serial port protocol settings options for
MIRRORED BITS protocol operating on communication channels requiring an
eight bit data format (Settings Sheet 27 of 27).
Section 10:
− Added VER Command explanation at end of section.
Section 12:
− Added information explaining the need to make Sequential Events Recorder
(SER) settings with care.
Appendix A:
− Updated Firmware Version information.
Appendix B:
− Updated Firmware Upgrade Instructions.
Appendix H:
− Updated screen capture on page H-14.
Appendix I:
− Explained the MB8A and MB8B serial port protocol settings options for
Mirrored BITS protocol operating on communication channels requiring an
eight data bit format.
Appendix J:
− Extensively rewritten.
990721 Updated Appendix A: Firmware Versions.
990616 New Manual Release.

Date Code 20020426 Table of Contents i
SEL-351-5, -6, -7 Instruction Manual
SEL-351-5, -6, -7 INSTRUCTION MANUAL
TABLE OF CONTENTS
SECTION 1: INTRODUCTION AND SPECIFICATIONS
SECTION 2: INSTALLATION
SECTION 3: OVERCURRENT, VOLTAGE, SYNCHRONISM CHECK,
FRE UENCY, AND POWER ELEMENTS
SECTION 4: LOSS-OF-POTENTIAL, LOAD ENCROACHMENT, AND
DIRECTIONAL ELEMENT LOGIC
SECTION 5: TRIP AND TARGET LOGIC
SECTION 6: CLOSE AND RECLOSE LOGIC
SECTION 7: INPUTS, OUTPUTS, TIMERS, AND OTHER CONTROL LOGIC
SECTION 8: BREAKER MONITOR, METERING, AND LOAD PROFILE
FUNCTIONS
SECTION 9: SETTING THE RELAY
SECTION 10: SERIAL PORT COMMUNICATIONS AND COMMANDS
SECTION 11: FRONT-PANEL INTERFACE
SECTION 12: STANDARD EVENT REPORTS, SAG/SWELL/INTERRUPTION
REPORT, AND SER
SECTION 13: TESTING AND TROUBLESHOOTING
SECTION 14: APPENDICES
Appendix A: Firmware 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 (DNP) 3.00
Appendix I: MIRRORED BITS™
Appendix J: SEL-351 Unsolicited SER Protocol
Appendix K: SEL-5030 ACSELERATOR®
SECTION 15: SEL-351-5, -6, -7 RELAY COMMAND SUMMARY

Date Code 20020426 Introduction and Specifications i
SEL-351-5, -6, -7 Instruction Manua
TABLE OF CONTENTS
SECTION 1: INTRODUCTION AND SPECIFICATIONS ......................1-1
SEL-351 Relay Models ................................................................................................................ 1-1
Potential Transformer Connections...................................................................................... 1-2
Instruction Manual Sections Overview ........................................................................................ 1-3
Applications ................................................................................................................................. 1-6
Hardware Connection Features ....................................................................................................1-7
Communications Connections.................................................................................................... 1-10
General Specifications................................................................................................................ 1-11
Processing Specifications ................................................................................................... 1-15
Relay Element Pickup Ranges and Accuracies .................................................................. 1-15
Instantaneous/Definite-Time Overcurrent Elements .................................................. 1-15
Time-Overcurrent Elements ....................................................................................... 1-16
Under-and Overvoltage Elements.............................................................................. 1-16
Synchronism-Check Elements.................................................................................... 1-17
Under- and Overfrequency Elements ......................................................................... 1-17
Timers................................................................................................................................. 1-17
Substation Battery Voltage Monitor................................................................................... 1-17
Metering Accuracy ............................................................................................................. 1-18
Power Element Accuracy ................................................................................................... 1-19
TABLES
Table 1.1: SEL-351 Relay Models........................................................................................................ 1-1
Table 1.2: SEL-351 Firmware Versions................................................................................................ 1-2
FIGURES
Figure 1.1: SEL-351 Relays Applied Throughout the Power System.................................................... 1-6
Figure 1.2: SEL-351 Relay 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: SEL-351 Relay Extra I/O Board (Model 0351xY, Plug-In Connector Version; Main
Board Shown in Figure 1.2) .......................................................................................... 1-8
Figure 1.4: SEL-351 Relay Extra I/O Board (Model 0351x1, Screw-Terminal Block Version;
Main Board Shown in Figure 1.2) ................................................................................. 1-9
Figure 1.5: SEL-351 Relay Communications Connections Examples ................................................. 1-10

Date Code 20020426 Introduction and Specifications 1-1
SEL-351-5, -6, -7 Instruction Manua
SECTION 1: INTRODUCTION AND SPECIFICATIONS
This section includes the following overviews of the SEL-351 Relay:
SEL-351 Relay Models
Instruction Manual Sections
Applications
Hardware Connection Features
Communications Connections
General Specifications
SEL-351 RELAY MODELS
This instruction manual covers the following SEL-351 Relay models:
Table 1.1: SEL-351 Relay Models
Model
Number
Rack Unit
Height
Number of
Isolated I/O
Contacts
Rear-Panel
Connection
Type
Output
Contact Type
Reference
Figures
0351x0 2U 6/8 screw-
terminal block
standard 1.2, 2.2, 7.1,
7.27
0351x1 3U 6/8 (main
board)
screw-
terminal block
standard 1.2, 2.3, 2.4,
7.1, 7.27
8/12 (extra I/O
board)
screw-
terminal block
standard or
high-current
interrupting
1.4, 2.3, 2.4,
7.2, 7.28
0351xY 3U same as 0351x1 plug-in
connectors
same as
0351x1
1.2, 1.3, 2.3,
2.4, 2.5, 7.1,
7.2, 7.27, 7.28
The model numbers are derived from the SEL-351 Relay ordering information sheet. The model
numbers in Table 1.1 are only the first part of an actual ordering number—enough to distinguish
one model type from another. The “x”field indicates the firmware version (see Table 1.2).
These numbers should not be used to order an SEL-351 Relay. To order an SEL-351 relay, refer
to the actual ordering information sheets.
Model 0351x0 and 0351x1 differ only in that model 0351x1 has an extra I/O board (and thus
increased rack unit height—see Figure 2.1). Model 0351xY is similar to model 0351x1, except
that it has plug-in connectors.
A vertical SEL-351 Relay is available in the 0351x1 and 0351xY models only (see Figure 2.4).
The vertical relays use the same rear panels as the horizontal 0351x1 and 0351xY models in
Figure 2.4. Though Figure 2.4 shows the extra I/O board (OUT201 through IN208) for model
0351x1, the vertically-mounted version of this model can be ordered without this extra I/O board
(the space appears blank).

1-2 Introduction and Specifications Date Code 20020426
SEL-351-5, -6, -7 Instruction Manua
Any SEL-351 Relay model with firmware version 5, 6, or 7 can be ordered with the more
sensitive neutral channel (IN) current input options (0.2 A or 0.05 A nominal). Table 4.1 and
accompanying note show the particular ground directional elements available with different
options of the neutral channel (IN) current input. The 0.05 A nominal neutral channel (IN)
current input option is a legacy nondirectional sensitive earth fault (SEF) option (the 0.2 A
nominal neutral channel (IN) current input option can provide the same SEF function and
additional directional options, as detailed in Table 4.1).
Throughout this instruction manual, when differences among the SEL-351 Relay models in
Table 1.1 are explained, model numbers are referenced for clarity.
Differences between model 0351x0, 0351x1, and 0351xY show up in references to optoisolated
inputs, output contacts, and board jumpers. Figure 2.24 through Figure 2.26 and Table 2.2
through Table 2.7 show the labeling differences between the board jumpers.
Table 1.2: SEL-351 Firmware Versions
Model Number Firmware Version Relay Features
03515 5 Standard features.
03516 6 Standard features plus MIRRORED BITS™and load
profiling.
SEL-351 Relays with firmware version 5 can be upgraded to firmware version 6. However,
SEL-351 Relays with firmware versions 5 and 6, with 150 Vac voltage inputs cannot be
upgraded to any higher firmware versions.
SEL-351 Relays with firmware versions 5 and 6, with 300 Vac voltage inputs can be upgraded
to higher firmware versions.
The voltage inputs for SEL-351 Relays with firmware version 5 or 6 are rated for voltages up
to 150 Vac or 300 Vac (channel VS, too), depending on ordered secondary input voltage.
03517 7 Includes firmware version 6 features plus power
and voltage sag/swell/interruption elements.
SEL-351 Relays with firmware version 7 come with 300 Vac voltage inputs only (connect any
voltage up to 300 Vac).
Potentia Transformer Connections
Firmware revisions prior to R308 (inclusive) operate with wye-connected (line-to-neutral)
voltages only. The VER command (available at Access Level 2) identifies these relays as "wye-
connected." In these earlier firmware revisions, the auxiliary voltage channel "VS" can only be
used for synchronism check or as a general-purpose voltage input. See Access Level 2
Commands in Section 10: Serial Port Communications and Commands for details on the VER
command.
Firmware revisions numbered R309 or higher can be configured via global setting PTCONN to
accept either wye (line-to-neutral) or delta (line-to-line) voltages using the open-delta connection.
The VER command identifies these relays as "wye or delta connected." See Potential
Transformer Inputs in Section 2: Installation for details on the open-delta connection.
Also in firmware revisions numbered R309 or higher, the auxiliary voltage channel "VS" can be
configured via global setting VSCONN = VS to accept a synchronism check or general-purpose