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how to perform winding resistance test on transformer

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    how to perform winding resistance test on transformer

    please describe step by step guide how to perform winding resistance test on three phase dry type transformer

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    Quote Originally Posted by mask12900 View Post
    please describe step by step guide how to perform winding resistance test on three phase dry type transformer
    Using a Transformer Winding Resistance tester connect the current leads and Voltage leads across a winding(In a Wye connected transformer it will be A-N,B-N,C-N, for Delta it will be A-B,B-C,C-A) wait for unit to stabilise and record value.

    Delta values should always be measured values x1.732.

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    Quote Originally Posted by bmclean View Post
    Using a Transformer Winding Resistance tester connect the current leads and Voltage leads across a winding(In a Wye connected transformer it will be A-N,B-N,C-N, for Delta it will be A-B,B-C,C-A) wait for unit to stabilise and record value.

    Delta values should always be measured values x1.732.
    i usually do test at 10% of rated current and make sure winding temperature is measured so readings can be corrected to manufacters readings

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    Dry Type Winding resistance

    To tag on to the 10%, I have always heard you shouldn't exceed 10% rated current. Also the Manual for the Vanguard TTR and Winding resistance sets have really good info for dry types with in accessible neutrals and other nonstandard configurations.

    http://www.vanguard-instruments.com/download

    Breeze through and check out the manuals they have, I learned a good bit from them

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    Quote Originally Posted by jflan13 View Post
    To tag on to the 10%, I have always heard you shouldn't exceed 10% rated current. Also the Manual for the Vanguard TTR and Winding resistance sets have really good info for dry types with in accessible neutrals and other nonstandard configurations.

    http://www.vanguard-instruments.com/download

    Breeze through and check out the manuals they have, I learned a good bit from them
    Xmfr manufacturers typically recommend that the current output
    selected should not exceed about 10% of the rated winding current, because it will cause erroneous readings due to heating of the winding.
    Always choose the highest current output possible for the expected resistance
    value.
    Typical ranges are 0.1-10 % of rated winding current

    Here are some slides from RichmondCC:
    http://engineering.richmondcc.edu/Co...nce%20Test.pdf

    Here is the procedure from TestGuy.net for Winding Resistance Testing:
    https://testguy.net/content/276-Tran...ting-Explained

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