Schweitzer Engineering Laboratories SEL-387E Manuale utente

SEL-387E Relay

Current Differential and

Voltage Protection Relay

Instruction Manual

20080110

*PM387E-01-NB*

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.

CAUTION: The continuous rating of the current

inputs is 3 · I

nom

. If any currents in this test will

exceed this rating, reduce the TAPn values as

needed, to prevent possible damage to the input

circuits.

ATTENTION: La capacité, en régime permanent,

des entrées de courant est 3 · I

nom

. Si un courant

d’essai dépassait cette valeur, réduire la prise TAPn

pour prévenir les dommages aux circuits d’entrée.

CAUTION: The continuous rating of the current

inputs is 3 · I

nom

. For this test, you may want to

choose low values of U87P and TAPn, in order to

limit the required test current to a safe value.

ATTENTION: La limite, en régime permanent, des

entrées de courant est 3 · I

nom

. Pour ce test, vous

pourriez choisir de valeurs peu élevées pour U87P et

TAPn, de façon à limiter le courant de test à une

valeur sécuritaire.

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.

AVERTISSEMENT: 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.

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. PM387E-01

Date Code 20080110 Table of Contents i

SEL-387E Instruction Manual

SEL-387E INSTRUCTION MANUAL

TABLE OF CONTENTS

SECTION 1: INTRODUCTION AND SPECIFICATIONS

SECTION 2: INSTALLATION

SECTION 3: PROTECTION FUNCTIONS

SECTION 4: CONTROL LOGIC

SECTION 5: METERING AND MONITORING

SECTION 6: SETTINGS

SECTION 7: COMMUNICATIONS

SECTION 8: FRONT-PANEL OPERATION

SECTION 9: ANALYZING EVENTS

SECTION 10: TESTING AND TROUBLESHOOTING

SECTION 11: APPENDICES

Appendix A: Firmware and Manual Versions

Appendix B: SEL-300 Series Relays Firmware Upgrade Instructions

Appendix C: SEL Distributed Port Switch Protocol (LMD)

Appendix D: Configuration, Fast Meter, and Fast Operate Commands

Appendix E: Compressed ASCII Commands

Appendix F: Unsolicited SER Protocol

Appendix G: Distributed Network Protocol (DNP3)

Appendix H: IEC 61850 Communications

SECTION 12: SEL-387E RELAY COMMAND SUMMARY

Date Code 20080110 Introduction and Specifications i

SEL-387E Instruction Manual

TABLE OF CONTENTS

SECTION 1:

INTRODUCTION AND SPECIFICATIONS......................1-1

Introduction...................................................................................................................................1-1

Instruction Manual Overview.......................................................................................................1-1

Relay Functions ............................................................................................................................1-2

Current Differential Protection .............................................................................................1-2

Restricted Earth Fault Protection..........................................................................................1-3

Overcurrent Protection..........................................................................................................1-3

Volts-per-Hertz Protection....................................................................................................1-3

Overvoltage and Undervoltage Protection............................................................................1-3

Frequency Protection ............................................................................................................1-4

Through-Fault Event Monitor...............................................................................................1-4

Programmable Optoisolated Inputs and Output Contacts ....................................................1-4

Model Options ..............................................................................................................................1-4

Conventional Terminal Blocks .............................................................................................1-4

Plug-In Connectors (Connectorized

)...................................................................................1-4

Specifications................................................................................................................................1-5

General..................................................................................................................................1-5

Metering Accuracy ...............................................................................................................1-8

Station DC Battery Monitor..................................................................................................1-8

Differential Element .............................................................................................................1-8

Harmonic Element ................................................................................................................1-9

Instantaneous/Definite-Time Overcurrent Elements (Winding) ..........................................1-9

Time Overcurrent Elements (Winding and Combined Current) ..........................................1-9

Over-/Undervoltage Elements ............................................................................................1-10

Frequency Element .............................................................................................................1-10

Volts/Hertz Element ...........................................................................................................1-10

FIGURES

Figure 1.1:

SEL-387E Relay Functional Overview ................................................................................1-2

Date Code 20080110 Introduction and Specifications 1-1

SEL-387E Instruction Manual

SECTION 1: INTRODUCTION AND SPECIFICATIONS

NTRODUCTION

Use this relay to protect two- to three-winding power transformers, buses, reactors, generators,

large motors, or other multiterminal power apparatus. Three- or four-terminal applications

permit separate connection of current transformers from two breakers connected to the same

transformer winding, such as in ring-bus or breaker-and-a-half schemes. The relay settings

permit you to use wye- or delta-connected current transformers with virtually any type of

transformer winding connection.

The SEL-387E Differential Relay provides three differential elements with dual slope

characteristics. The second slope provides security against CT saturation for heavy through

faults. Be sure to conduct detailed analysis of CT performance under worst-case saturation

conditions to set the relay characteristic correctly for bus protection applications. For assistance

with CT selection, obtain SEL Application Guide 99-07 Bus Protection Using a Four-Winding

Low-Impedance Percentage Differential Relay from the SEL Web site (www.selinc.com).

NSTRUCTION

ANUAL

VERVIEW

This instruction manual applies to the SEL-387E Relay. If you are unfamiliar with this relay, we

suggest that you read the following sections in the outlined order.

Section 1: Introduction and Specifications for an introduction, instruction manual overview,

relay functional overview, and specifications.

Section 3: Protection Functions to understand the protection elements and their associated

settings.

Section 4: Control Logic to understand inputs, the Relay Word, outputs, and logic. Use this

section to understand the settings necessary for implementing your logic.

Section 6: Setting the Relay to understand settings that are not described in Section 3 or

Section 4, for default settings, and for settings sheets.

Section 7: Communications for a description of the serial port commands used to set the relay

for control, obtain target information, and obtain metering information, etc.

Section 8: Front-Panel Operation for a description of how to perform the serial port commands

from the front panel.

Section 5: Metering and Monitoring to learn how to retrieve operations data such as metering,

DC battery monitor, breaker monitor, and relay status.

Section 9: Analyzing Events for a description of event report and sequential events report

generation, event report formats, sequential event reports, and report interpretation.

1-2 Introduction and Specifications Date Code 20080110

SEL-387E Instruction Manual

Section 2: Installation to learn how to configure, install, and wire your relay.

Section 10: Testing and Troubleshooting for test procedures and a troubleshooting guide. You

can use this section as a tutorial to check your understanding of the relay's operation.

ELAY

UNCTIONS

V/Hz Under-/

Overfrequency

Undervoltage

Time Overcurrent

Phase

Ground

Neg. Seq.

Overcurrent

Phase

Ground

Neg. Seq.

Time Overcurrent

Phase

Ground

Neg. Seq.

Three-Phase

Current

Differential

Overcurrent

Phase

Ground

Neg. Seq.

Time Overcurrent

Phase

Ground

Neg. Seq.

Overcurrent

Phase

Ground

Neg. Seq.

Combined

Time Overcurrent

Phase

Ground

Overvoltage

50 87

SEL-387E Relay

Auto-

transformer

SELOGIC

Control Equations

Event Reports and

Sequential Events Recorder

Breaker Wear Monitor

Station Battery Monitor

ASCII, Binary, and Distributed

Port Switch Communications

Remote and Local

Control Switches

Accurate Metering

Restrained and Unrestrained

Differential Elements

Second- and Fifth-

Harmonic Blocking

CT and Transformer

Connection Compensation

*Additional I/O

*Optional Functions

Figure 1.1: SEL-387E Relay Functional Overview

Current Differential Protection

The SEL-387E Relay includes independent restrained and unrestrained current differential

elements. The restrained element has a dual-slope, variable-percentage restraint characteristic.

Use the fifth-harmonic element to prevent relay misoperation during allowable overexcitation

conditions. Even-harmonic elements (second and fourth harmonic) provide security against

inrush currents during transformer energization, complemented by the dc element which

measures the dc offset. The even-harmonic element offers the choice between harmonic

blocking and harmonic restraint. In the blocking mode, the user selects either blocking on an

individual phase basis or on a common basis, as per application and philosophy. The second-,

fourth-, and fifth-harmonic thresholds are set independently, and the dc blocking and harmonic

restraint features are enabled independently. A separate unrestrained differential element

provides faster clearance of high-magnitude internal faults.

Date Code 20080110 Introduction and Specifications 1-3

SEL-387E Instruction Manual

Restricted Earth Fault Protection

The SEL-387E Relay provides sensitive detection of internal ground faults via the Restricted

Earth Fault (REF) protection element. The Winding 3 inputs are used for introduction of neutral

CT polarizing current. Operating current is derived from the residual current calculated for the

protected winding. A directional element determines whether the fault is internal or external.

Tripping is supervised by zero-sequence current thresholds and a positive-sequence current

restraint setting. The REF function is applicable to a single grounded wye winding or an

autotransformer with one breaker and set of CTs at one terminal and one breaker and set of CTs

at the other terminal. Since the Winding 3 inputs are used for the neutral CT, only two of the

winding inputs may be used for normal differential or overcurrent protection purposes.

Overcurrent Protection

The SEL-387E Relay provides nondirectional overcurrent elements for each winding/terminal:

• Phase Overcurrent: Three-level instantaneous; definite time; inverse time

• Residual Overcurrent: Instantaneous; definite time; inverse time

• Negative-Sequence Overcurrent: Instantaneous; definite time; inverse time

In addition, the SEL-387E Relay has two special overcurrent functions:

• Combined overcurrent (inverse time, phase, and ground) for summed currents from

Windings 1 and 2

• Restricted Earth Fault (REF) protection for sensitive ground fault detection in grounded

wye-connected windings

Overcurrent element pickup settings and operating characteristics are independent of the

differential element settings. Most elements can be torque controlled.

Volts-per-Hertz Protection

The SEL-387E Relay provides sensitive dual-level elements to detect voltage overexcitation.

Level 1 volts-per-hertz elements provide instantaneous and definite-time operation for alarm or

trip. Level 2 elements provide one of three selectable inverse-time/definite-time composite

characteristics, or one user-definable inverse-time characteristic, for alarm or trip. Both volts-

per-hertz protection levels may be torque controlled.

Overvoltage and Undervoltage Protection

The SEL-387E Relay provides eight overvoltage and undervoltage elements. Elements include

phase undervoltage and overvoltage elements, phase-to-phase undervoltage and overvoltage

elements, as well as positive sequence, negative sequence, and residual overvoltage elements.

Phase and phase-to-phase elements operate when any individual phase exceeds the respective

setting. Combine these elements with SEL

OGIC

control equations to provide time delays for up

to 999999 cycles. The elements have many applications in protection, control, and indication.

1-4 Introduction and Specifications Date Code 20080110

SEL-387E Instruction Manual

Frequency Protection

The SEL-387E Relay provides six levels of under-/overfrequency elements. Each element can

operate as either an underfrequency or as an overfrequency element, depending on its pickup

setting. Should any phase voltage fall below a user-defined value, the relay disables all

frequency elements, providing security against loss-of-potential conditions. The relay tracks the

system frequency from 40.1 to 65 Hz to provide measurement of frequency excursions over a

wide range. Apply the elements readily to underfrequency load shedding and restoration control

systems.

Through-Fault Event Monitor

Through faults are a major cause of transformer damage and failure. Fault currents cause

cumulative mechanical damage by displacing transformer windings every time a fault occurs.

Thermal stress from fault currents damages insulation. The SEL-387E Relay provides a through-

fault event monitor to gather fault current level, duration, and date/time for each through fault.

The monitor performs a simple I

t calculation and cumulatively stores calculation results for each

phase. Use these through-fault event data to schedule proactive maintenance for transformers

and to help justify possible system enhancements to mitigate through faults.

Programmable Optoisolated Inputs and Output Contacts

The SEL-387E Relay is equipped with enhanced SEL

OGIC

control equations that allow design of

a custom tripping or control scheme. SEL

OGIC

control equation functions include independent

timers, tripping, closing, event report triggering, and relay output contact control.

ODEL

PTIONS

Conventional Terminal Blocks

This model includes hardware that supports nine current inputs, three voltage inputs, six

optoisolated inputs, seven programmable output contacts, one alarm contact, three EIA-232

ports, one EIA-485 port, and IRIG-B time code. It uses terminal blocks that support #6 ring

terminals. This robust package meets or exceeds numerous industry standard type tests.

This relay is available in a 3.50" (2U) or 5.25" (3U) rack-mount package or 4.9" or 6.65"

panel-mount package. Additional optoisolated inputs and programmable output contacts are

available with the larger packages.

Plug-In Connectors (Connectorized

)

This model includes hardware that supports all of the features of the conventional terminal

blocks model. It differs in its use of plug-in connectors instead of terminal blocks. In addition,

it provides

• Quick connect/release hardware for rear-panel terminals.

• Level-sensitive optoisolated inputs.

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