Introduction; About This Manual; The Use Of The Relay; Features - ABB REJ 527 Operator's Manual

1MRS 751055-MUM
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Directional or Non-Directional Earth-Fault Relay
Operator's Manual

Introduction

About this manual

The purpose of this manual is to provide the user with the basic information on the
relay REJ 527 and to focus on detailed instructions for using the Man-Machine
Interface (MMI) of the relay. In addition to the instructive part, the manual includes
a short chapter discussing the service of the relay.

The use of the relay

The directional or non-directional earth-fault relay REJ 527 is designed for earth-
fault current as well as zero-sequence voltage protection and supervision in
distribution substations. It can also be used for protection of generators, motors and
transformers. Generally the relay measures the zero-sequence voltage, earth-fault
current and phase angle of the system.
The low-set earth-fault current stage can be given a definite-time or an inverse-time
characteristic whereas the high-set earth-fault current stage and the voltage stage
feature the definite-time characteristic alone. The operation of the earth-fault current
and voltage stages can be blocked by means of an external control signal.
The protection relay REJ 527 is based on a microprocessor environment. A self-
supervision system monitors continuously the operation of the relay.
The MMI includes an LCD display which makes the local use of the relay safe and
easy.
Local control of the protection relay 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 fibre-optic bus.

Features

• Directional or non-directional low-set earth-fault current stage I
time or inverse definite minimum time (IDMT) characteristic
• Directional or non-directional high-set earth-fault current stage I
definite-time characteristic
• Deblocking zero-sequence voltage stage U
• The two earth-fault current stages configurable to operate alternatively as two
voltage stages: a three-stage voltage monitoring operation possible
• Intermittent earth-fault protection
• Circuit-breaker failure protection (CBFP)
• Disturbance recorder
• Two accurate measuring inputs
• Galvanically isolated binary input with a wide input voltage range
• All settings can be modified with a personal computer
• Settings are stored into non-volatile memory and remain even in case of power
supply failure
• Two normally open power output contacts
> with definite-
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REJ 527
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