# IDMT Relay Setting & Curves

## IDMT Relay Setting & Curves

• Calculation of Actual Plug (Relay Pick up) setting of Various IDMT Relay.
• Calculate PSM of Various IDMT Relay.
• Calculate Time setting of Various IDMT Relay.
• Calculate Total Grading Time of Various IDMT Relay.
• Calculate Actual Operating time according to Various IES Curve.
• Draw Various IDMT Relay characteristic Curve.

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.

### 7 Responses to IDMT Relay Setting & Curves

i am working in Elelctrical field in last couple of years but i have douts in desining if pannels and capacity of cables and calculating of fault current so please give some idea for that

2. Rbesh says:

Dear sir We are having IDMT relay for transformer protection & transformer rating as follows:1500KVA,11000/433 Volts,78.73/200 Amps,Please explain the calculation of settings in IDMT relay.

3. Elango.K says:

Hello sir,
These days all are static relays and these have stepped characterstic. can you post about stepped characterstic.

4. Sandeep Ayyagari says:

Dear Sir,
We have a Transformer 11 KV/433 V 1500 KVA with 78.73A/2000 A ,Pls tell the calculation for Over Current and Earth Fault Setting we have MC 51 A IDMT relay with Normal Inverse Curve

5. Qaisar Shafi says:

sir, i want to construct my own portable pry injection kit with 200amp capacity kindly guide in this as i want to tesy the ct’s of 400/5amp along eith relays. i know trsnsformer winding also. trf core type and varaic amperage etc. Regards