On which side of a two winding transformer the tap changer is usually located and why?
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The tap changer is provided on the H.T. side in case of power transformer and on the L.T. side in case of distribution transformer
Reason of tap changer on HT side in case o Power Transformer
1. since power transformer are of large power rating ;
So, its better to have tap changer on HT side that results in low current flow tapes as compare to if it is on LV side.
2. Also it provide better regulation to transmiison line
3. Provide protection and avoid circulation current in transformer
lets say due to ferranti effect HT side voltage is greater than its rated voltage and tap changer is on LV side that could damage transformer and also result in more circulation current.
while in case of distribution transfore situation is different
Since at distribution level no ferranti effect therefore no reason to have tape changer on HV side .
Also tap changer on the distribution level need to change frequently due to change in load .therefore its better to have it on LV side with lower votlage and lower current compare to the LV side of power transformer.
Reason of tap changer on HT side in case o Power Transformer
1. since power transformer are of large power rating ;
So, its better to have tap changer on HT side that results in low current flow tapes as compare to if it is on LV side.
2. Also it provide better regulation to transmiison line
3. Provide protection and avoid circulation current in transformer
lets say due to ferranti effect HT side voltage is greater than its rated voltage and tap changer is on LV side that could damage transformer and also result in more circulation current.
while in case of distribution transfore situation is different
Since at distribution level no ferranti effect therefore no reason to have tape changer on HV side .
Also tap changer on the distribution level need to change frequently due to change in load .therefore its better to have it on LV side with lower votlage and lower current compare to the LV side of power transformer.
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