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Transformer equivalent circuit open and closed circuit test 
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#1
Oct1613, 02:44 PM

P: 8

I see the open and closed circuit test on the transformer section
I dont understand why we doing that(open and closed circuit test) can anyone explain and give some example? 


#2
Oct1613, 03:46 PM

Mentor
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#3
Oct1813, 04:01 AM

P: 51

Transformer equivalent circuit open and closed circuit tests are some of required Power Transformer Tests [IEC 600761Standard]
1)Measurement of voltage ratio and check of phase displacement :open secondary winding test. Since primary EMF in this case is approximately equal to supply voltage and secondary EMF is secondary output voltage the ratio of primary to secondary voltage it is EMF ratio then directly proportional with number of turns of the windings. 2) Measurement of shortcircuit impedance and load loss :shortcircuited secondary winding. The primary voltage will rise until the primary current shall not be less than 50 % of rated. The transformer shortcircuit impedance will be then Voltage/Current. The resistance has to be measured separately. As the supply voltage is reduced the noload lossesmagnetic losseswill be negligible. So the active power measured in shortcircuit test will be proportional will the loadloss. 


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