Sel 787 User Manual

Package Contents
Panel Cutout Template Product Literature CD No. 8-32 Mounting Screws,
Gasket, & Serial Port Cover
Configurable Label Kit
Label Removal Tool
Blank Pushbutton LED Label
198–0424RIGHT
UP
Blank Target LED Label
198-0424LEFT
UP
For Additional Technical Assistance Call +1.509.332.1890
Express Installation Guide
SEL-787 Transformer Protection Relay

Sel 787 Specifications

General

Model	SEL-787
Type	Transformer Protection Relay
Nominal AC Voltage	120/240 Vac
Frequency	50/60 Hz
Current Inputs	1A or 5A nominal
Protection Elements	Differential, Overcurrent, Thermal
Communication Protocols	DNP3, Modbus, IEC 61850
Inputs	analog inputs
Power Supply	110–240 Vac
Operating Temperature	-40°C to +85°C
Nominal DC Voltage	125/250 Vdc
Enclosure	Panel-mount

Summary

Express Installation Guide

Package Contents Overview

Lists and describes the essential items included in the SEL-787 relay package, such as templates and literature.

Typical Connections

Input/Output Card Wiring

Details wiring configurations for various optional input/output cards for the SEL-787 relay.

Communication and Time Source Wiring

Explains connections for communication ports (Ethernet, Fiber Optic, EIA-485) and IRIG-B time source.

Rack Mounting Instructions

New Control Center Installation

Step-by-step guide for installing the SEL-787 relay into a new panel cutout.

Retrofitting Existing Relays

Instructions for replacing older relays with the SEL-787 using a retrofitting plate.

Detailed Connections

Wire Size and Power Supply Connections

Guidelines for wire sizing and connecting power supply to Card Slot A.

Main Board and Serial Port Connections

Connecting communication interfaces like Ethernet, Fiber Optic, EIA-232, and IRIG-B.

Digital and Analog I/O Card Connections

Connecting digital inputs, digital outputs, and analog outputs on Card Slot C.

Additional Connection Details

Digital Inputs Card Connections

Details for connecting the 8 Digital Inputs (8 DI) card.

Voltage/Current and Current Inputs Cards

Connection specifics for Voltage/Current and Current Inputs cards.

Communication With Relay

HMI Pushbutton Operations

Explanation of the front panel pushbuttons for navigation and control.

Computer Communication Setup

Step-by-step guide for establishing serial communication with the relay using a PC.

Relay Settings Configuration

Gathering Transformer Nameplate Data

Details required transformer nameplate information like MVA, voltages, and CT ratios.

Editing Relay Settings with QuickSet

Guide to modifying ACSELERATOR QuickSet settings for transformer parameters.

Configuring Group 1 Settings

Specific configuration settings for Group 1, including CT connections and voltages.

Advanced Relay Settings

Setting Compensation and Logic Parameters

Configuring CT compensation, differential elements, and logic settings.

Global, Front-Panel, and Report Settings

Configuring global parameters, front-panel display, and event reporting.

Communications Ports and Protocol Setup

Configuring communication ports and protocols for the relay.

Saving and Verifying Relay Settings

Instructions for saving, uploading, and verifying relay settings.