ABB Earth Leakage Relay

REJ 521 ABB Earth Leakage Relay

The ABB Earth Leakage Relay REJ 521 is a secondary relay that is connected to the current transformers of the object to be protected. The earth-fault unit continuously measures the neutral current of the object. On detection of a fault, the relay will start, trip the circuit breaker, provide alarms, record fault data, etc., in accordance with the application and the configured relay functions.

The earth-fault unit includes low-set stage I0 > and high-set stage I0 >>. If the high-set stage is given a setting value within the lower part of the setting range, the relay module will have two nearly identical stages. In this case, the relay can be used in two-stage load-shedding applications.

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Feature

  • Low-set non-directional earth-fault stage with definite time or inverse definite minimum time (IDMT) characteristic
  • High-set non-directional earth-fault stage with instantaneous or definite time characteristic
  • Circuit-breaker failure protection unit (CBFP)
  • Disturbance recorder
  • HMI with an alphanumeric LCD and manoeuvring buttons
  • Continuous self-supervision

Applications

  • Service entrance ground fault protection
  • General industrial use

Specification

  • Supply (input) voltage :230 V, 130 V or 100 V alter,+ 10… -15 %, 50 60 Hz
  • Output voltage :50 V alter
  • Voltage withstand from terminals 1, 2, 4, 5 to terminal 10 :1000 V direct
  • Current carrying capacity :Permanent short circuit between clamps 1,2,4,5 and clamp 10 allowed

 

 

 

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