Mastering Transformer Winding Resistance: Insider Tips and Tricks

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Watch our next Transformer Series video on Transformer Excitation Current here: kzbin.info/www/bejne/nJnIeq2coZx-Y7ssi=x5WpDXJCb4Xn4maR

[@aregawishishay]

thanks for the detail explanation. one question why the winding resistance result is increasing to both direction from the main tap(nominal)

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Thanks for your question. A transformer that has a resistive LTC on the secondary will display this kind of characteristic that increases as you move away from the nominal position in either the raise or lower direction. In either of the extreme positions (16R or 16L), all of the regulating winding will be included in the circuit and represent the highest winding resistance values. Each step away from the neutral position will represent a slightly larger amount of winding slightly increasing the winding resistance. In the case of a 16 raise and 16 lower tap switches with a neutral position in the middle, the difference between the raise and lower tap positions is a reversing switch. While that polarity of the winding included in the circuit may be opposite for the raise and lower taps, the amount of winding resistance would be comparable to the corresponding position in the opposing polarity.