Tapping of transformer winding? benefit of Tapping on HV winding
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Why Tapping are provided on transformer winding? And what is benefit of Tapping, why Tapping provided on HV winding?
Regulating voltage is requirement in power system due to following reason
1) to supply required voltage to load
2) to compensate voltage drops due to load fluctuations
3) to compensate input voltage supply to load
Most of electrical loads, equipment are designed to work satisfactorily on constant voltage. So it is necessary to keep consumer end terminal voltage levels in prescribed limits.
Voltage control is performed by changing transformer turn ratio. And this is achieved by providing Tapping on the transformer winding. Tapping are either provided on primary or on secondary winding of transformer.
2) to compensate voltage drops due to load fluctuations
3) to compensate input voltage supply to load
Most of electrical loads, equipment are designed to work satisfactorily on constant voltage. So it is necessary to keep consumer end terminal voltage levels in prescribed limits.
Voltage control is performed by changing transformer turn ratio. And this is achieved by providing Tapping on the transformer winding. Tapping are either provided on primary or on secondary winding of transformer.
Voltage per turn is very high in large transformer, even changing single turn at LV can achieve large voltage change in secondary.
Why tap changer is connected to on HV side winding of power transformer?
Low voltage winding (LV) being inner winding in core type transformer so it difficult to access for tapping purpose. Hence tapping are provided on HV winding on core type transformer.Providing taps to changes voltage levels called as tap changing of transformer
Tap changing of transformer are two type
1) No-load tap changing
2) On load tap changing
In No-load tap changing transformer load thrown off before tap changing done and other hand in on load tap changing load remains on transformer while performing tap changing
1) No-load tap changing
2) On load tap changing
In No-load tap changing transformer load thrown off before tap changing done and other hand in on load tap changing load remains on transformer while performing tap changing
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