Booster transformer are used in electric railway AC centenary feeders to collect the return current from the rails and the earth to the return conductor.
Booster transformer is generally used in sub station. when electrical power is supply to the very long distance. line loss is produced. hence, at the far away we did not get actual voltage which we want. so, by using booster transformer we can overcame that situation.
Sometimes it is desired to control the voltage of a transmission line at a point far away from the main
transformer. This can be achieved by using of a booster transformer. The secondary of the booster transformer is connected in series with the line whose voltage is to be controlled. The primary of this transformer is supplied from a regulating transformer fitted with on-load tap-changing gear. The BT is connected in such a way that its secondary injects a voltage in phase with the line voltage.
The voltage at XX is maintained constant by tap-changer in the main transformer. However, there may be considerable voltage drop between XX and YY due to fairly long feeder and tapping of loads. The voltage at YY is controlled by the use of regulating transformer. By changing the tap ping on the regulating transformer, the magnitude of the voltage injected into the line can be varied. This permits to keep the voltage at YY to the desired value.
This method of voltage control has three disadvantages,
- It is more expensive than the on-load tap-changing trans-former.
- More floor space is required.
- It is less efficient owing to losses in the booster.
Installing a boost transformer is having an effect on voltage regulation. which drops to 10.% from 2.5% with booster and without booster respectively. This also results in an additional energy consumption. This is beside maintenance and reliability issue by adding overlap on booster transformer.
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