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Schweitzer Engineering Laboratories SEL-351S User Manual

Schweitzer Engineering Laboratories SEL-351S
636 pages
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SEL-351S
RELAY
METER
CONTROL
FAULT LOCATOR
INSTRUCTION MANUAL
SCHWEITZER ENGINEERING LABORATORIES, INC.
2350 NE HOPKINS COURT
PULLMAN, WA USA 99163-5603
TEL: (509) 332-1890 FAX: (509) 332-7990

Table of Contents

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Schweitzer Engineering Laboratories SEL-351S Specifications

General IconGeneral
Frequency50/60 Hz
Communication PortsEthernet, Serial
Operating Temperature-40°C to +85°C
MeteringVoltage, Current, Power, Energy
Current Input/Rating5 A
Communication ProtocolsDNP3, Modbus, IEC 61850
Event RecordingYes
MountingPanel
InputsDigital inputs
OutputsDigital outputs

Summary

SECTION 1: INTRODUCTION AND SPECIFICATIONS

RELAY ELEMENT PICKUP RANGES AND ACCURACIES

Details pickup ranges and accuracy for various relay elements.

SECTION 2: INSTALLATION

RELAY MOUNTING

Provides dimensions and mounting details for rack- and panel-mount models.

SECTION 3: OVERCURRENT, VOLTAGE, SYNCHRONISM CHECK, FREQUENCY, AND POWER ELEMENTS

INSTANTANEOUS/DEFINITE-TIME OVERCURRENT ELEMENTS

Details settings and operation of overcurrent elements.

TIME-OVERCURRENT ELEMENTS

Describes time-overcurrent element settings and curve types.

VOLTAGE ELEMENTS

Explains voltage element operation, settings, and types.

SYNCHRONISM CHECK ELEMENTS

Details voltage input requirements and operation for synchronism check.

FREQUENCY ELEMENTS

Explains frequency element operation and settings for over/underfrequency detection.

POWER ELEMENTS (AVAILABLE IN FIRMWARE VERSION 7)

Details power element settings and logic for real/reactive power.

SECTION 4: LOSS-OF-POTENTIAL, LOAD ENCROACHMENT, AND DIRECTIONAL ELEMENT LOGIC

LOSS-OF-POTENTIAL LOGIC

Describes how loss-of-potential conditions affect relay operation.

LOAD-ENCROACHMENT LOGIC

Explains how load encroachment logic is enabled and its impact on protection.

DIRECTIONAL CONTROL FOR NEUTRAL GROUND AND RESIDUAL GROUND OVERCURRENT ELEMENTS

Details directional control for ground fault elements.

DIRECTIONAL CONTROL FOR NEGATIVE-SEQUENCE AND PHASE OVERCURRENT ELEMENTS

Explains directional control for negative-sequence and phase overcurrents.

SECTION 5: TRIP AND TARGET LOGIC

TRIP LOGIC

Explains different trip logic schemes and their operation.

SWITCH-ONTO-FAULT (SOTF) TRIP LOGIC

Describes logic for trip conditions based on breaker status and fault presence.

PERMISSIVE OVERREACHING TRANSFER TRIP (POTT) LOGIC

Details POTT logic for transfer trip schemes.

DIRECTIONAL COMPARISON UNBLOCKING (DCUB) LOGIC

Explains DCUB logic for two-terminal and three-terminal line schemes.

SECTION 6: CLOSE AND RECLOSE LOGIC

CLOSE LOGIC

Explains the logic that controls the close output contact.

RECLOSE SUPERVISION LOGIC

Describes logic that supervises automatic reclosing.

SECTION 7: INPUTS, OUTPUTS, TIMERS, AND OTHER CONTROL LOGIC

SELOGIC CONTROL EQUATION VARIABLES/TIMERS

Details the SELOGIC control equation variables and timers.

SECTION 8: BREAKER MONITOR, METERING, AND LOAD PROFILE FUNCTIONS

BREAKER MONITOR

Explains the relay's capability to monitor circuit breaker maintenance.

STATION DC BATTERY MONITOR

Details the relay's function in monitoring station DC battery voltage.

DEMAND METERING

Covers demand metering types and how they are set.

SECTION 9: SETTING THE RELAY

TIME-OVERCURRENT CURVES

Describes various time-overcurrent curves and their parameters.

RECLOSER CURVES

Lists and describes recloser control curve designations.

RELAY WORD BITS (USED IN SELOGIC CONTROL EQUATIONS)

Explains the meaning and application of relay word bits.

SECTION 10: SERIAL PORT COMMUNICATIONS AND COMMANDS

SERIAL PORT ACCESS LEVELS

Describes different access levels for serial port commands.

COMMAND SUMMARY

Provides an alphabetical listing of all serial port commands.

COMMAND EXPLANATIONS

Details the function and usage of serial port commands.

SECTION 11: FRONT-PANEL INTERFACE

FRONT-PANEL PUSHBUTTON OPERATION

Details the operation of front-panel pushbuttons.

OPERATOR CONTROLS

Provides an overview of all operator control pushbuttons and their functions.

SECTION 12: STANDARD EVENT REPORTS, SAG/SWELL/INTERRUPTION REPORT, AND SER

SAG/SWELL/INTERRUPTION (SSI) REPORT

Describes the SSI report and its triggering/recording.

SSI RECORDER OPERATION AND DETAILS

Explains the SSI recorder's operation, modes, and data.

SECTION 13: TESTING AND TROUBLESHOOTING

RELAY SELF-TESTS

Explains the built-in self-test routines and their outputs.

RELAY TROUBLESHOOTING

Provides guidance on diagnosing and resolving common relay issues.

APPENDIX F: SETTING NEGATIVE-SEQUENCE OVERCURRENT ELEMENTS

SETTING NEGATIVE-SEQUENCE DEFINITE-TIME OVERCURRENT ELEMENTS

Guides on setting negative-sequence definite-time overcurrent elements.

SETTING NEGATIVE-SEQUENCE TIME-OVERCURRENT ELEMENTS

Guides on setting negative-sequence time-overcurrent elements.

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