Transformer IDMT Over Current & Earth Fault Relay Setting

Transformer IDMT  Over Current & Earth Fault Relay Setting:

    Calculate LT & HT Side IDMT Over Current Relay Setting (50/51)  

  • Calculate LT & HT Side IDMT Over Current Relay Pick up setting.
  • Calculate LT & HT Side IDMT Over Current Relay PSM.
  • Calculate LT & HT Side IDMT Over Current Relay Time setting.
  • Calculate Actual Operating time according to Various IES Curve.
  • Calculate LT & HT Side Low current Setting(I>).
  • Calculate LT & HT Side High Current Setting(I>>)
  • Calculate LT & HT Side Actual Operating Time of Relay(t>)
  • Calculate LT & HT Side Actual Operating Time of Relay(t>>)

  Calculate LT & HT Side IDMT Earth Fault Relay Setting (50N/51N)  

  •  Calculate LT & HT Side IDMT Earth Fault Relay Pick up setting.
  • Calculate LT & HT Side IDMT Earth Fault Relay PSM
  • Calculate LT & HT Side IDMT Earth Fault Relay Time setting
  • Calculate Actual Operating time according to Various IES Curve.
  • Calculate LT & HT Side Low current Setting(Ie>)
  • Calculate LT & HT Side High Current Setting(Ie>>)
  •  Calculate LT & HT Side Actual Operating Time of Relay(te>)
  •  Calculate LT & HT Side Actual Operating Time of Relay(te>>)

    Calculate Differential Protection Relay setting:

  • Calculate Percentage Differential Current at Normal tapping
  • Calculate Percentage Differential Current at Highest tapping
  • Calculate Percentage Differential Current at Lowest tapping

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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 13 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.

9 Responses to Transformer IDMT Over Current & Earth Fault Relay Setting

  1. praful anantkar says:

    awsom…………..speechless………….you are giving lots off info….thx…….

  2. rudramuni says:

    thanks a lot sir for your valuable info..keep this up..

  3. Nyke says:

    thank u so much Mr.Parmar

    ur info: are very helpful, may u lead a successful life …

  4. RAJEEV JAKHAR says:

    Dear Jignesh ,

    I have some doubt.
    Please advice
    1) why do we need to have Dual ratio CTs
    (I mean Dual Core Dual ratio) I know one core is for measurement and other is for protection.But why do we need to have Dual ratio.

    2)Why dual ratio is generally 50% of main and why not some other percent.

  5. zak says:

    Mr. Parmar, please there’s any other way to get this doc? we can’t download it.

  6. RAMESH T H says:

    Hi sir i am ramesh here,can explain about providing differential protection and REF Protection to transformer and also usage of ICT’s in differential protection and also usage of stabalizing resistor and linear resistor in REF Protection

  7. GAJENDER says:

    Hello dear Parmar sir
    plz suggest me for thumb rule of fault current at low, medium, high voltage,

  8. IDMT earht fault relay TMAS 101 a. setting IR 0.125 to 1A with 10 setting. TMS 0.1 to 1.0 with 10 setting MAKE- ALIND

    QUANTITY———–01 nos

  9. U R Mazumder says:

    Hi Parmar,
    I would like to know about setting Data of OC&EF relay for 33/11KV 5MVA power transformer on LT side(RELAY,MAKE- Crompton Greaves ,CGI14N/C.Please give in detail.

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