This set up is designed to study the working principle and IDMT characteristics of Single phase directional over current relay (electromechanical type). This set up consists of


  1. Electromechanical Type – Directional Over Current Relay –IDMT Type
  2. Relay test kit (Current Injection Unit)
  • Electromechanical Type – Directional Over Current Relay –IDMT Type-1A &110VAC, Make ALSTOM
  • One number of variable AC current Source of 0-20A
  • One number of Autotransformer is provided to adjust the current output continuously
  • Provision to change the direction of current coil
  • 110VAC is provided as PT coil input
  • One number of digital AC Ammeter (0-30A)  is provided to measure the current input in amp
  • One number of Automatic trip time measurement circuit (ATTM Circuit) is provided
  • One number LCD – Digital stop Clock is provided in ATTM Circuit to measure relay trip time in ms
  • All are mounted on a nice cabinet with diagram stickered on front panel.&230VAC@50Hz AC Input with power ON/OFF Switch
  1. study & testing of Directional Over current relay with Different Plug setting & Time settings

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