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1MRS751802-MUM

Protection Relay

Technical Reference Manual, Standard Configurations

REX 521

3.2.2. Standard configuration M02

3.2.2.1. Features

• Three-phase non-directional overcurrent protection with three stages

• Three-phase transformer inrush and motor start-up current detector

• Directional earth fault protection with three stages

• Phase discontinuity protection for three phases

• Three-phase thermal protection for cables

• Supervision function for the energizing current input circuit

• Current waveform distortion measurement

• Three-phase current measurement

• Neutral current measurement

• Residual voltage measurement

• Calculation of the accumulated electric breaker wear of the circuit breaker (CB)

• Transient disturbance recorder

• Trip-circuit supervision

• Delayed trip output for the circuit-breaker failure protection (CBFP) function

• Automatic reclosing 1...5 shots

• Circuit breaker control with indication

• Lockout function

• Object indication

• Logic control position selector

• User-configurable I/Os

• Interlocking

• User-configurable alarm LEDs

ABB REX 521 Technical Reference Manual, Standard Configurations

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