4.C] Three phase power consumed by the balanced load is given by ๐ = โ3๐๐ฟ ๐ผ๐ฟcos(โ ) watts, then show that two wattmeter sufficient to measure three phase power P.
Answer:
Measurement of power by two wattmeter method
This method is normally used for measuring power in three phase three wire balanced circuit. The current falls in two wattmeters are connected to any two lines and the potential coil of each wattmeter is connected to the third line.
Consider a balanced load and a balanced supply. The fig.1 shows three phase power measurements using two wattmeters.
