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A thermal power plant produces electric power of 600 kW at 4000 V, which is to betransported to a place 20 km away from the power plant for consumer’s usage. It can betransported either directly with a cable of large current carrying capacity or by using acombination of step – up and step – down transformers at the two ends. The drawback of thedirect transmission is the large energy dissipation. In the method using transformers, thedissipation is much smaller. In this method, a step – up transformer is used at the plant sideso that the current is reduced to a smaller value. At the consumer’s end, a step – downtransformer is used to supply power to the consumers at the specified lower voltage. It isreasonable to assume that the power cable is purely resistive and the transformers are idealwith power factor unity. All the currents and voltages mentioned are rms values.
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A thermal power plant produces electric power of 600 kW at 4000 V, which is to betransported to a place 20 km away from the power plant for consumer’s usage. It can betransported either directly with a cable of large current carrying capacity or by using acombination of step – up and step – down transformers at the two ends. The drawback of thedirect transmission is the large energy dissipation. In the method using transformers, thedissipation is much smaller. In this method, a step – up transformer is used at the plant sideso that the current is reduced to a smaller value. At the consumer’s end, a step – downtransformer is used to supply power to the consumers at the specified lower voltage. It isreasonable to assume that the power cable is purely resistive and the transformers are idealwith power factor unity. All the currents and voltages mentioned are rms values.
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