ADR221C – O/C+Current Unbalance For Capacitor Bank

ADR221C O/C+current unbalance for capacitor bank


  • Specially designed for 25kV Shunt Capacitor Protection. As per RDSO specs TI/SPC/PSI/PROTCT/6070 (9/08)
  • 2 Element (1 OC + 1 CUR) over current IDMT with Current Unbalance Relay.
  • Breaker Failure detection.
  • In-built CB trip circuit monitoring during close as well as open condition.
  • large 20x4 LCD display for Parameter and setting display.

Model Functional Details Cabinet Style
ADR221C Numerical O/C + Current Unbalance Relay For Capacitor Bank CSE-H-130

Numerical O/C + Current Unbalance Relay For Capacitor Bank :ADR221C

General Description

ADR221C is second generation Numerical Integrated Feeder Protection Relay for Traction Application. It consist all the necessary protection and monitoring functions required for traction feeder.

  • Disturbance Recorder. 50 cycles of actual waveform of voltage & current (45 pre-fault & 5 post fault) are captured & saved in the builtin memory with date time stamping, for analyzing fault condition.
  • Separate Communication Ports for SCADA (RS485) as well as Local testing (RS232C)
  • Fully communicable with IEC standard open protocol.
  • Very low burden on CT (less than 0.2VA) and PT (less than 0.2 VA).
  • Online display of R, X, V, I CB status and other digital and logical status.
  • Continuous monitoring of module’s internal hardware and alarm generation in case of failure of any critical components.
  • Facility to synchronised Relay time with external GPS network.
  • 10 Digital Output contacts for local alarm as well as tele-signalling.
  • 9 Optically isolated digital status input for monitoring of status and avoid used of external relay logic.
  • 100 nos of event memory, event such CB close, Trip, digital status change, relay pkp etc. All events are with date and time stamped up to 1ms.