Standard Configurations; Hw Version: Basic; Standard Configuration B01; Features - ABB REX 521 Technical Reference Manual, Standard Configurations

1MRS 751802-MUM
3.
3.1.
3.1.1.
3.1.1.1.
Protection Relay
Technical Reference Manual, Standard Configurations

Standard configurations

HW version: Basic

Standard configuration B01

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
For more information about the features, please refer to chapter "Function block
descriptions" on page 74.
REX 521
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