Describe with neat circuit diagram the method of measurement of power in a High voltage, high current a.c circuit.
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Circuit diagram: 

image


Explanation: 

The primary winding of P.T is connected across high voltage side and secondary winding is connected to pressure coil of low range wattmeter. The high voltage is proportionally converted to low volt within the range of pressure coil of wattmeter. The primary winding of C.T is connected in series with load which carries high load current. And the secondary winding of C.T is connected to current coil of low range wattmeter. The high load current is proportionally converted to low current which within the range of current coil of wattmeter The real power consumed in the load can be calculated the following formula is used Real power consumed = reading of wattmeter x ratio of C.T x ratio of P.T

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