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

ABB Substation Automation
Products and Systems
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1MRS750616-MUM
Technical Reference Manual

Introduction

About this manual

This manual is intended to provide the user with thorough information on the relay
REJ 527 and its applications. The focus in the manual is on technical description of
the relay.
Instructions for using the Man-Machine Interface (MMI) are found in separate
"Operator's Manual" and for installation in "Installation Manual".

The use of the relay

The directional or non-directional earth-fault relay REJ 527 is intended to be used
for earth-fault 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 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
• Two change-over type signal output contacts
• Output contact functions freely configurable for desired operation
• Optical PC-connector for two-way data communication (front)
• RS-485 connector (rear) for system communication
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REJ 527
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