1MRS751802-MUM
REX 521
53
Protection Relay
Technical Reference Manual, Standard Configurations
3.3.7. Standard configuration H07
3.3.7.1. Features
• Three-phase non-directional overcurrent protection with three stages
• Non-directional earth fault protection with two stages
• Directional earth fault protection with two stages
• Three-phase overvoltage protection with two stages
• Three-phase undervoltage protection with two stages
• Underfrequency or overfrequency protection with one stage
• Negative phase sequence (NPS) protection with two stages
• Three-phase motor start-up supervision
• Three-phase thermal overload protection for devices
• Phase reversal protection
• Phase sequence voltage protection
• Fuse failure protection
• Three-phase non-directional undercurrent protection with one stage
• Supervision function for energizing current input circuit
• Supervision function for energizing voltage input circuit
• Current waveform distortion measurement
• Voltage waveform distortion measurement
• Three-phase current measurement
• Neutral current measurement
• Three-phase voltage measurements
• Residual voltage measurement
• System frequency measurement
• Three-phase power and energy 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
• Operation time counter
• Lockout function
• Object indication
• Logic control position selector
• User-configurable I/Os
•Interlocking
• User-configurable alarm LEDs
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