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Dry Tranformer Turns Ratio

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    Dry Tranformer Turns Ratio

    How much deviation is allowed from the calculated value ( three phase dry transformer Rated voltage 11000 / 415 volts, Rated Power 2000KVA)? Kindly also mention the reference of Standard.

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    TTR standard deviation

    The standard deviation as defined by ANSI/IEEE C57.12.00-2006, Section 9.1 states that results should be within 0.5% of nameplate markings, with rated voltage applied to one winding. The TTR with accuracy of 0.1% is accepted as a referee.

    - Power Equipment Maintenance and Testing, Paul Gill


    ANSI/NETA standards also state that TTR results should be within 0.5%

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    TTR

    Quote Originally Posted by shamimkhan View Post
    How much deviation is allowed from the calculated value ( three phase dry transformer Rated voltage 11000 / 415 volts, Rated Power 2000KVA)? Kindly also mention the reference of Standard.
    In the NETA-MTS and ATS under electrical test results it says, "Turns-ratio test results should not deviate more than one-half percent from either the adjacent coils or the calculated ratio." Page 32 for both books.

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