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  1. able357

    Three Phase distribution transformer banks

    An excellent resource for this exact question is found in a book titled Power Transforemrs Principles and Applications written by John J. Winders, Jr. It has a section on Matching Transforemrs for parallel and Bank Operations chapter 3 section 3.9
  2. able357

    meggering through a transformer

    what point to what point are you testing! I never tested the conductors that go to the tx so im curious!
  3. able357

    meggering through a transformer

    Okay so first off you should test the transformer at 1kv! To test the LV side of a single phase transformer you need to short the h1 to h2 with some shooting wire or bare copper wire! you also need to short the LV side (X1-X2). You have insulation between windings and insulation from the coils...
  4. able357

    Hand Cranked vs Digital Transformer Turns Ratio

    Well, when you look at testing a transformer and getting its turns ratio your inputting a voltage and reading it back on the other end. So your question is what specifications should you ask for? Any ratio bridge should be fine, if you put in 100 volts or a 1000 volts your ratio should stay the...
  5. able357

    Portable DGA analyser

    If your interested in getting the pf and strength of the oil you can use the DGA method but also a method my company uses. We use a test system called a DFR which stands for dielectric frequency response. The way it works is it applies a voltage to with frequency that sweeps from .001 Hz to...
  6. able357

    Ambient temperature and transformer performance

    I am a test engineer and perform electrical tests in the field and regurlary see xmfrs at cold temperatures. Actually just two days ago I tested a transformer using a system called DFR (dielectric frequency response) which tests the power factor. The only time I see an issue with a transformer...
  7. able357

    Hand Cranked vs Digital Transformer Turns Ratio

    I use a digital turns ratio test set. If you are looking for accuracy its more dependable or accurate. If your upper and lower limits are like 5% then the digital set will have more resolution also.

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