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    pandees's Avatar
    pandees Posts: 1, Reputation: 1
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    #1

    Nov 2, 2009, 08:13 AM
    How to calculate the short time current rating for current transformer?
    Respected sir's,

    Please clear my doubts?
    How to calculate the "short time current rating"(i.e-primary short time current rating-like if u take 400-400/5-15va/class1,40ka/3sec).


    40ka/3sec-how to calculate this rating from the substation?
    Is there any formula?please advise me...

    I am waiting for your's reply...


    Thanks&regards,
    pandees.b
    anasmemon's Avatar
    anasmemon Posts: 3, Reputation: 1
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    #2

    Mar 10, 2011, 01:43 AM
    Short time rating is defined by your MVA rating. Suppose you are using 0.8MVA transformer at 33/11KV, so your STC will be 0.8*1000/(1.73*11)=42KA.

    I hope this will help you. So to calculate STC the data you have given is not useful.. but system parameters are required.
    kkspwr's Avatar
    kkspwr Posts: 1, Reputation: 1
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    #3

    Jul 16, 2012, 11:00 PM
    How much will be 6.6 /.4 kv transformer be equivalent in KVA
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #4

    Jul 17, 2012, 04:50 AM
    Not enough information provided, assuming you mean the primary is 6.6kV and the secondaray is .4 kV.

    Quote Originally Posted by kkspwr View Post
    how much will be 6.6 /.4 kv transformer be equivalent in KVA
    surajkr123's Avatar
    surajkr123 Posts: 1, Reputation: 1
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    #5

    Jun 2, 2013, 09:40 PM
    Study some electrical man , you are technically too weak to suggest , are you aware of % impedance?
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