Rated voltage on LV side is lesser than the HV side. To understand the reason behind this we will consider a Single Phase Transformer of rating 3300 220 Volt 33 kVA.
Open And Short Circuit Test Of Transformer Electrical4u
As we know that Transformer Open Circuit Test is conducted on LV side and that Short Circuit Test on HV side.
Why open circuit test is done on lv side. Therefore for Open Circuit Test on LV side the range of Voltmeter will be 220 V. Thus the voltage at the LV side of this Transformer is 220 Volt. In open circuit test HV is left open on no load and the rated voltage is applied to the low voltage side to get the constant losses.
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