Transformer Test

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kasrop Associate Join Date: Nov 2016 Posts: 38	Transformer Test 04/04/2018 1:38 AM
	dear all in DC resistance test for power transformer(off load T.CH) when value of resistance for one phase is different.now how we can discriminate the fault in winding transformer or in tap changer.and which test limit the fault in winding or tap changer thanks
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kumarpradeep Associate Join Date: Mar 2017 Posts: 41	#1 Re: transformer test 04/04/2018 2:30 AM
	Such a very nice information about the transformer testing. __________________ Power Transformers in India \| Wire Assembly Manufacturers in India \| Transformer Manufacturer in India
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redfred Guru Join Date: Dec 2008 Location: Long Island NY Posts: 15600 Good Answers: 981	#2 Re: Transformer Test 04/04/2018 9:27 AM
	Well this is a case where the actual numbers found will very much matter to the diagnosis. Since you provide us not even a sample... If you anticipated 100 ohms and you found 1.7 million ohms then you have a break in the wire. If instead you found 0.2 ohms then you have a short circuit. If instead your number varies less than the expected tolerance percentage from the magnet wire manufacturer then get over it. Now how to discriminate between a tap wiring mistake and a transformer winding mistake using only a DC resistance check it still helps to have actual numbers. I find a sketch of what and how one is testing a circuit also helps immensely. Well it does for one capable of testing for a simple mesh analysis. __________________ "Don't disturb my circles." translation of Archimedes last words
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lyn Guru Join Date: Oct 2008 Posts: 42355 Good Answers: 1693	#3 Re: Transformer Test 04/04/2018 10:35 AM
	You must work with coolyar. Ask the manufacturer how he did it! Read these and LEARN SOMETHING! Guide to Transformer Resistance Testing Transformer Winding Resistance Test Measuring DC Winding Resistance of Transformer
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StandardsGuy Guru Join Date: Dec 2006 Location: North America, Earth Posts: 4528 Good Answers: 106	#4 Re: Transformer Test 04/05/2018 11:37 AM
	Your question is a little unclear. Are you asking how to test for a faulty transformer or to test for the wrong tap being selected or what? I built a 60Hz ohmmeter to use for testing transformer phase and other problems. It used 60Hz rather than DC, so faults are easily identified (impedance at 60Hz is much higher than DC resistance). There are LCR bridges that can do this type of measurement. __________________ “I would rather have questions that can't be answered than answers that can't be questioned.” - Richard Feynman
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