# IDMT (Inverse Definite Minimum Time) Relay Calculation

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## 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 | Get Download Updates | Get Technical articles

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Page edited by E.C. (Google).

### 7 Comments

1. Alamgir
May 21, 2018

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

2. D. Harle
Dec 10, 2017

no, find it yourself

3. praveen
Feb 15, 2017

Sir I want complete report about IDMT relay over current

4. sundar
Aug 15, 2016

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

5. swap
Feb 17, 2016

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

6. chandresh
May 02, 2015

what is the meaning of overshoot in relay… please describe

7. mne amin
Apr 15, 2015

hi
hm waiting to your reply

thanks

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