Introduction; About This Manual; The Use Of The Relay; Features - ABB REJ 527 Technical Reference Manual

1MRS 750616-MUM
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Directional or Non-Directional Earth-Fault Relay
Technical Reference Manual

Introduction

About this manual

The purpose of this manual is to provide the user with thorough information on the
protection relay REJ 527 and its applications, focusing on giving a technical
description of the relay.
Refer to the Operator's Manual for instructions on how to use the
Human-Machine Interface (HMI) of the relay, also known as the Man-Machine
Interface (MMI), and to the Installation Manual for installation of the relay.

The use of the relay

The directional or non-directional earth-fault relay REJ 527 is intended for
earth-fault protection in medium voltage distribution networks but can also be used
for protection of generators, motors and transformers.
The REJ 527 is based on a microprocessor environment. A self-supervision system
continuously monitors the operation of the relay.
The HMI includes a Liquid Crystal Display (LCD) which makes the local use of the
relay safe and easy.
Local control of the relay via serial communication can be carried out with a portable
computer connected to the front connector and remote control via the rear connector
connected to the distribution automation system through the serial interface and the
fibre-optic bus.

Features

• Directional or non-directional low-set earth-fault current stage with
definite-time or inverse definite minimum time (IDMT) characteristic
• Directional or non-directional high-set earth-fault current stage with definite-time
characteristic
• Deblocking zero-sequence voltage stage with definite-time characteristic
• The two earth-fault current stages can be configured to operate alternatively as
two voltage stages: three-stage voltage monitoring operation possible
• Intermittent earth-fault protection
• Circuit-breaker failure protection (CBFP)
• Disturbance recorder
• recording time up to 19 seconds
• triggering by a start or a trip signal from any protection stage and/or by a binary
input signal
• records two analogue channels and seven digital channels
• adjustable sampling rate
• Non-volatile memory for
• up to 60 event codes
• setting values
REJ 527
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