1MRS751802-MUM
REX 521
59
Protection Relay
Technical Reference Manual, Standard Configurations
3.3.9. Standard configuration H09 (No sensors)
3.3.9.1. Features
• Three-phase non-directional overcurrent protection with three stages
• Non-directional earth fault protection with three stages
• Three-phase overvoltage protection with two stages
• Three-phase undervoltage protection with two stages
• Residual overvoltage protection with three stages
• Three-phase transformer inrush and motor start-up current detector
• Underfrequency or overfrequency protection with two stages
• 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
• Automatic reclosing 1...5 shots
• 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
• Lockout function
• Object indication
• Logic control position selector
• User-configurable I/Os
•Interlocking
• User-configurable alarm LEDs
It is possible to record 16 digital signals in the disturbance recorder.
VTs are used to measure phase-to-earth voltages.
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