ABB REX 521 - 3 Standard Configurations; HW Version: Basic; Standard Configuration B01; Features

1MRS751802-MUM
REX 521
23
Protection Relay
Technical Reference Manual, Standard Configurations
3. Standard configurations
3.1. HW version: Basic
3.1.1. Standard configuration B01
3.1.1.1. Features
• Three-phase non-directional overcurrent protection with three stages
• Non-directional earth fault protection with three stages
• Phase discontinuity protection for three phases
• Three-phase thermal protection for cables
• Three-phase transformer inrush and motor start-up current detector
• Supervision function for the energizing current input circuit
• Current waveform distortion measurement
• Three-phase current measurement
• Neutral current 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
For more information about the features, refer to Chapter 7. Function block
descriptions.