Rơ le bảo vệ IPR-A155
Current Protection Relay IPR-A is designed to protect medium voltage lines against over-current and short circuit scenarios present in line fault or ground fault even under disturbances. Currents are measured throughout current transformers (CT) from each line. The information is internally processed in order to take the current protection actions defined under ANSI, IAC or IEC standard.
Applications
- Primary and backup protection for utility feeder, power plants and industrial distribution systems
- Protection of transformers, overhead lines, cables and generators
- Allow the opening of the switch/disconnector within the limits of its capacity, leaving the circuit interruption to the fuses in the case of short circuit
Protection and Functionality
- (50) Instantaneous over-current
- (50N/50G) Instantaneous ground over-current
- (51) Inverse time phase over-current
- (51N/51G) Inverse time ground over-current
- ANSI, IAC or IEC/BS142 curves included:
- moderately inverse
- normal inverse
- very inverse
- extremely inverse
- definite time
- Overload alarm pickup level
- Accumulated kA per phase on breaker interruption
- CT primary ratio selectable in 5 A steps (10 A to 6000 A)
- Line and ground RMS currents measurement
- 1 trip relay and 2 programmable auxiliary relay
- Control power drop or internal fault relay
- Digital inputs: 1 breaker status – 3 programmable
- Touchpad programming
- Breaker operation and trip failure
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