Question

with a neat circuit and phasor diagram explain the three phase power measurements by two wattmeter method​

Answer 1

Answer:

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. The total instantaneous power absorbed by the three loads Z1, Z2 and Z3, is equal to the sum of the powers measured by the two wattmeters, W1 and W2.

Answer 2

Answer:

There are two methods to measure power in a three-phase balanced star-connected load using a wattmeter:

Two Wattmeter Method: In this method, two wattmeters are used to measure the total power in the three-phase system. One wattmeter measures the power in two of the phases while the other measures the power in the remaining phase. The readings of the two wattmeters are then added to obtain the total power in the system.

Three Wattmeter Method: In this method, three wattmeters are used to measure the power in each individual phase. The readings of the three wattmeters are then added to obtain the total power in the system.

In both methods, the wattmeters are connected to the three phases of the load through current and potential transformers. The phasor diagram shows the phase angle relationship between the current and voltage in each phase, which is used to calculate the power using the formula: P = VI cosΦ, where P is power, V is voltage, I is current, and Φ is the phase angle between current and voltage.