Ground Current Protection Relay
IPR-D
Ground Protection Relay
Ground Protection Relay (IPR-D) has been designed to measure the ground RMS current under normal conditions or under disturbances.
The current signals are sensed throughout a current transformer (CT). This information is internally processed by the microprocessor in order to take the current protection actions defined under ANSI, IAC or IEC standard.
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Features
- CT primary ratio selectable in 5 A steps (5 A to 6000 A)
- Ground RMS current measurement
- 1 trip relay and 3 programmable auxiliary relay
- Control power drop or internal fault relay
- Digital inputs: 1 breaker status & 3 programmable
- Touchpad programming
- Breaker operation & trip failure
Applications
- Primary and backup protection for utility feeder, power plants and industrial distribution systems
Communication
- Communication port: (1) RS232 and (2) RS485
- Remote programming of the setpoints
- Communication Protocol: Modbus RTU
Protection and Functionality
- (50G/50N) Instantaneous ground overcurrent
- (51G/51N) Inverse time ground overcurrent
- ANSI, IAC or IEC/BS142 curves included:
- moderately inverse
- normal inverse
- very inverse
- extremely inverse
- definite time
- Overload alarm pickup level
Signalling
- LED and LCD display indication
- Ground current indication
- Last trip cause and storage of values
- Indication and storage of fault conditions and their values
- Threshold LED for 50G/N, 51G/N
Accessories for the Feeder Protection Family
Current transformers
