ABB REX 521 - HW Version: Medium; Standard Configuration M01; Features

1MRS751802-MUM
REX 521
29
Protection Relay
Technical Reference Manual, Standard Configurations
3.2. HW version: Medium
3.2.1. Standard configuration M01
3.2.1.1. 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
• Circuit breaker control with indication
• Lockout function
• Object indication
• Logic control position selector
• User-configurable I/Os
•Interlocking
• User-configurable alarm LEDs