Introduction - GE Multilin 850 Communications Manual

GE
Grid Solutions
8 Series Protective Relay Platform
Chapter 1: Introduction
8 SERIES PROTECTIVE RELAY PLATFORM – COMMUNICATIONS GUIDE

Introduction

The Multilin 8 Series protective relay platform includes four different relays, the 850, 845,
869, and 889. Information in this manual applies to all 8 series relays unless otherwise
indicated.
The Multilin 850 relay is a microprocessor-based unit intended for the management and
primary protection of distribution feeders, as well as for the management and backup
protection of buses, transformers, and transmission lines. The 850 relay is particularly
suited to overhead feeders, where automatic reclosing is normally applied.
The Multilin 869 relay is a microprocessor-based unit intended for the management and
primary protection of medium and large sized motors. Base relay models provide thermal
overload and overcurrent protection plus a number of current and voltage based backup
functions.
The Multilin 845 relay is a microprocessor-based unit intended for the management and
primary protection of the medium to large size medium voltage (MV) and high voltage (HV)
power transformers. Both 2-winding and 3-winding transformers are supported. The 845
relay provides a number of primary and backup current and voltage based protection
functions. This system allows for control of the circuit breakers at each winding plus a
number of monitoring and control functions are also provided.
The Multilin 889 relay is a microprocessor-based unit intended for the primary protection
of small, medium and large sized generators. Base relay models provide standard
generator protection functions plus a number of current and voltage based backup
functions.
1-1