# IDMT Over Current Relay Grading Calculation (50/51)

## IDMT Over Current Relay Grading Calculation (50/51):

• Calculate IDMT Over current Relay Grading up to 5 Nos of Radial Bus bar System.
• Calculate Relay Pick up setting of IDMT Over current Relay from Downstream to Source End.
• Calculate PSM of Various IDMT Relay from Downstream to Source End.
• Calculate Time setting of Various IDMT Relay from Downstream to Source End.
• Calculate Total Grading Time of Various IDMT Relay from Downstream to Source End.
• Calculate Actual Relay Operating time according to Various IES Curve.

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About Jignesh.Parmar
Jignesh Parmar has completed M.Tech (Power System Control), B.E(Electrical) from Gujarat University. He has more than 14 years experience in Power Transmission-Power Distribution-Electrical energy theft detection-Electrical Maintenance-Electrical Projects(Planning-Designing-coordination-Execution). He is Presently associate with one of the leading business group as a Deputy Manager at Ahmedabad,India. He is Freelancer Programmer of Advance Excel and design useful Excel Sheets of Electrical Engineering as per IS,NEC,IEC,IEEE codes. He is technical Author for "Electrical Mirror" and "Electrical India" Magazines. He is Technical Blogger and Familiar with English, Hindi, Gujarati, French languages. He wants to Share his experience & knowledge and help technical enthusiasts to find suitable solutions and updating themselves on various Engineering Topics.

### 10 Responses to IDMT Over Current Relay Grading Calculation (50/51)

1. spathikumaran says:

sir,
you r doing such a great job for upcoming electrical engineers hats off to that and…my question is i need test connection diagram of ”tan delta test” for transformer’s winding, bushing,cable and motor. I would be greatful if u send these details..

2. Prabakaran says:

I’m fresh engineer in electrical field. Now i’m working in EHV sub-station as trainee engineer. Will u explain the how to calculation formula for all those parameters.

3. Somasekhar says:

Dear Sir,

Can we use the IDMT Over Current Relay Grading Calculation for Ring main System also,
Pls let us know, I’m ready to buy this right now

4. Raman says:

Dear Sir,
Great job. How to calculate minimum fault current needed for relay co ordination.

5. soenaing says:

Dear sir,
I want to know about that loop impendence test for communication tower station.Pls explain as well as any imformation.

6. piyushgour says:

Sir, i want to know that the IDMT Curves i.e normal inverse 3.0,Normal inverse 1.3 sec,Very inverse etc are standard for all electromagnetic,static and numerical relays.

7. Ameen Basha says:

i need help in protection setting of double busbar overcurrent protection setting.

8. Abhijit says:

I am a fresh BE(electrical) engineer, working in a 3MW thermal power plant project. I need help about the most important points which need to keep in mind at the time of erection and commissioning.