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# 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 | Video Courses | Membership | Download Updates

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### 12 Comments

1. johnfu
Mar 19, 2022

Thanks you very much.

2. 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

3. EHSAN
Jun 30, 2020

DEAR MANAGEMENT EEP

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

THANK YOU

4. MD. NAZMUL ALAM KHAN
Sep 04, 2019

Need password

• Eng Nabil
Nov 15, 2021

the password is one “1”, welcome

5. Alamgir
May 21, 2018

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

6. D. Harle
Dec 10, 2017

no, find it yourself

7. praveen
Feb 15, 2017

Sir I want complete report about IDMT relay over current

8. sundar
Aug 15, 2016

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

9. swap
Feb 17, 2016

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

10. chandresh
May 02, 2015

what is the meaning of overshoot in relay… please describe

11. mne amin
Apr 15, 2015

hi
hm waiting to your reply

thanks

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