Summer Value Added Certification Courses

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Microcontroller Based Differential Relay

This test set-up consists of a. Microcontroller based differential relay. b. 300VA transformer set-up


  • One PIC Microcontroller used as processor to read all current, (PY, SY) & activation of relay function
  • One LCD to indicate,
  •    - Set value, All currents
       - Set time, DMT/IDMT type
       - Relay tripping time.
       - Biased/Unbiased type status
  • Four numbers of key used
  •    - To select IDMT/DMT type or biased un-biased type
       - Set current value adjustment
       - Set time adjustment
       - Reset function
  • Six 5A CT used to sense primary and secondary current.
  • One 12V TPTT auxiliary relay used for contactor operation.
  • Specification:
  •    - Current input : 0-5Amp
       - Voltage input : 0-230V
       - Number of contact : Three number No contact @ 220V, 10Amp rating.
       - Auxiliary supply : 230VAC, 50Hz
  • PC interfacing facility power ON/OFF switch with indicator.
  • Make : VI MICRO
  • Model : VPL - 83A