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IDMT (Inverse Definite Minimum Time) Relay Calculation
IDMT (Inverse Definite Minimum Time) Relay Calculation

Overcurrent and Earth Fault Relay Setting

Setting calculation is separated for overcurrent and eart fault relay. For both settings, there are few following input parameters:

  1. Name of Feeder
  2. Load Current: (IL) in Amps
  3. Min Fault Current (Line-Line) in Amps
  4. Max Fault Current (Line-Line) in Amps
  5. Relay Type
  6. Relay Code
  7. Relay No
  8. CT Primary Current (in Amps)
  9. CT Secondary Current (in Amps)
  10. Relay Error (%)
  11. CT Error (%)
  12. Over shoot (in seconds)
  13. C.B Interrupting Time (in seconds)
  14. Safety (in seconds)

Summary of overcurrent and earth fault relay settings:

  1. Actual Plug (Relay Pick up) setting
  2. Plug Setting Multiplier (PSM)
  3. Time setting
  4. Total Grading Time
  5. Low Over Current Setting: (I>)
  6. Actual Operating Time of Relay (tI>)
  7. High Over Current Setting: (I>>)
  8. Actual Operating Time of Relay (tI>>)
Software:IDMT (Inverse Definite Minimum Time) Relay Calculation
Version:12.10.2012
Developer:Jignesh Parmar
Size:39.1 Kb
Price:Free
Download:Right here | Video Courses | Membership | Download Updates

IDMT (Inverse Definite Minimum Time) Relay Calculation

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11 Comments


  1. Yasin Khalafov
    Dec 03, 2020

    Dir Sir,

    Every piece of information you provide has got a big value. I really appreciate all your efforts and time for doing this.

    SIncerely
    Yasin


  2. EHSAN
    Jun 30, 2020

    DEAR MANAGEMENT EEP

    VERY VERY THANK YOU FOR PRACTICAL, PROFESIONAL AND IMPORTANT INFORMATION.

    THANK YOU


  3. MD. NAZMUL ALAM KHAN
    Sep 04, 2019

    Need password


    • Eng Nabil
      Nov 15, 2021

      the password is one “1”, welcome


  4. Alamgir
    May 21, 2018

    i would like to used IDMT relay in a LT side is it possible. thanks


  5. D. Harle
    Dec 10, 2017

    no, find it yourself


  6. praveen
    Feb 15, 2017

    Sir I want complete report about IDMT relay over current


  7. sundar
    Aug 15, 2016

    i need password of relay idmt calculation sheet.can you please tell me how to unprotect that excel sheet


  8. swap
    Feb 17, 2016

    can we use ODMT oc relay in for short circuit protection?


  9. chandresh
    May 02, 2015

    what is the meaning of overshoot in relay… please describe


  10. mne amin
    Apr 15, 2015

    hi
    hm waiting to your reply

    thanks

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