Overview; Introduction; Description; Protection And Control Function Summary - GE Multilin 750 Quick Reference Manual

OVERVIEW

Introduction

This Quick Reference Guide takes you through the installation and setup of your GE Multilin
750/760 Feeder Mangement Relay and helps you get it up and running as quickly as
possible. The following topics are covered:
• Installing the 750/760
• Installing the EnerVista 750/760 Setup software
• Setting up the 750/760
This guide contains only basic instructions. For complete information, refer to the 750/760
Feeder Mangement Relay instruction manual (GE Publication number GEK-106293E).

Description

The 750/760 Feeder Mangement Relay is a microprocessor-based unit intended for the
management and primary protection of distribution feeders, as well as for management
and backup protection of buses, transformers, and transmission lines. The 760 relay is
particularly suited to overhead feeders, where automatic reclosing is normally applied.
Each relay provides protection, control, and monitoring functions with both local and
remote human interfaces. They also display the present trip/alarm conditions, and most of
the more than 35 measured system parameters. Recording of past trip, alarm or control
events, maximum demand levels, and energy consumption is also performed.
To aid new users in setting up basic protection, setpoints are set to typical default values
and advanced features are disabled. These settings can be reprogrammed at any time.
Programming can be accomplished with the front panel keys and display or, to simplify
programming and provide a more intuitive interface, setpoints can be entered with a PC
running the no-charge EnerVista 750/760 Setup software provided with the relay. Actual
values and setpoints can be displayed, altered, stored, and printed. If settings are stored in
a setpoint file, they can be downloaded at any time to the front panel program port of the
relay via a computer cable connected to the serial port of any personal computer.

Protection and control function summary

ANSI Description
27 Bus / line undervoltage
47 Negative-sequence voltage
50 Phase/neutral/ground/negative-sequence/sensitive ground instantaneous overcurrent
50BF Breaker failure with current supervision
51 Phase/neutral/ground/negative-sequence/sensitive ground time overcurrent
59 Bus overvoltage / neutral displacement
67 Phase/neutral/negative-sequence/sensitive ground/ground directional control
81 Bus underfrequency / rate of change
--- Undervoltage automatic restoration
--- Underfrequency automatic restoration
--- Bus transfer
--- Programmable logic inputs
--- Multiple setpoint groups
750/760 Quick Reference Guide
Overview
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