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winding resistance tolerance for a transformer test

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    winding resistance tolerance for a transformer test

    Here is a question for you ,what is the winding resistance tolerance for a transformer test and what are you using as a reference for your answer.That was on the level four test.

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    transformer winding resistance tolerance

    Quote Originally Posted by Larry5441 View Post
    Here is a question for you ,what is the winding resistance tolerance for a transformer test and what are you using as a reference for your answer.That was on the level four test.
    IEEE 62 Guide for Diagnostic Field Testing of Electric Power Apparatus - Part 1: Oil Filled Power Transformers, Regulators, and Reactors

    +/-5%

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    Quote Originally Posted by sepulveda7000 View Post
    IEEE 62 Guide for Diagnostic Field Testing of Electric Power Apparatus - Part 1: Oil Filled Power Transformers, Regulators, and Reactors

    +/-5%
    You need to look at IEEE C57.12.90 it is a updated standard stating that winding resistance readings has no specific standards and will only be used as a reference .

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    answer

    Quote Originally Posted by Larry5441 View Post
    You need to look at IEEE C57.12.90 it is a updated standard stating that winding resistance readings has no specific standards and will only be used as a reference .
    Adwell International LTD: If all readings are within one percent of each other then they are acceptable. Keep in mind that the purpose of the test is to test for gross differences between the windings and for opens in the connections.

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    Quote Originally Posted by ruel guanzon View Post
    Adwell International LTD: If all readings are within one percent of each other then they are acceptable. Keep in mind that the purpose of the test is to test for gross differences between the windings and for opens in the connections.
    That was not the question ,it ask what was the tolerance differences not the goal of the test

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    So that's 5%, 1%, or "no standard" depending on the reference. The goal of the question may be for you to match the standard to the reference. I've also seen 1/2% for factory testing from Megger corp.

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    According to Megger: The industry standard (factory) permits a maximum difference of 1/2 percent from the average of the three phase windings. Field readings may vary slightly more than this due to the many variables. If all readings are within one percent of each other, then they are acceptable.

    For the source document, see this thread -> http://testguy.net/threads/1497-Tran...stance-balance

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