1

1MRS 751123-MBG

Issued: 15.06.1999

Status: Updated

Version: C/16.10.2002

Data subject to change without notice

REU 523

Com

bined overvoltage and und

ervoltage

relay

Features • Single or three-phase use

• High-set overvoltage stage with definite-

time or inverse definite minimum time

(IDMT) characteristic

• Low-set overvoltage stage with definite-

time or IDMT characteristic

• High-set undervoltage stage with definite-

time or IDMT characteristic

• Low-set undervoltage stage with definite-

time or IDMT characteristic

• Positive-phase-sequence protection

• Ajustable drop-off/pick-up ratio for the low-

set stages

• Circuit-breaker failure protection (CBFP)

• Disturbance recorder

- recording time up to 12 seconds

- triggering by a start or a trip signal from

a protection stage and/or by a binary

input signal

- records three analogue channels and

eight digital channels

- adjustable sampling rate

• Non-volatile memory for

- up to 60 event codes

- setting values

- disturbance recorder data

- recorded data of the five last events with

time stamp

- number of starts for each stage

- alarm indication messages and LEDs

showing the status at the moment of

power failure

• Galvanically isolated binary input with a

wide input voltage range

• All settings can be modified with a personal

computer

• HMI with an alphanumeric LCD and

manoeuvring buttons

• IEC 60870-5-103 and SPA bus communi-

cation protocols

• Two normally open power output contacts

• Two change-over signal output contacts

• Output contact functions freely config-

urable for desired operation

• Optical PC-connector for two-way data

communication (front)

• RS-485 connector (rear) for system com-

munication

• Continuous self-supervision of electronics

and software. At an internal relay fault

(IRF), all protection stages and outputs are

blocked.

• User-selectable rated frequency 50/60 Hz

• User-selectable password protection for

the HMI

• User-selectable nominal voltage

100/110/115/120 V

• Display of primary voltage values

• Demand values

• Multi-language support

ABB REU 523 - Page 68

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