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Saturday, August 3, 2019

What is Two Wattmeter Method of Power Measurement in three phase system?

In electrical engineering, a wattmeter is a device used to measure the amount of electric power in watts in a given circuit.
There are three methods in measuring wattage, the one, two and three wattmeter methods. The two wattmeter method is commonly used on three-phase loads or circuits.

Two Wattmeter Method can be employed to measure the power in a 3 phase, three wire star or delta connected the balanced or unbalanced load. In Two wattmeter method the current coils of the wattmeter are connected with any two lines, say R and Y and the potential coil of each wattmeter is joined on the same line, the third line i.e. B as shown below in figure (A)
The total instantaneous power absorbed by the three loads Z1, Z2 and Z3, are equal to the sum of the powers measured by the Two wattmeters, W1 and W2

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