Ground Current Protection Relay

IPR-D

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
  

Current transformers