The two wattmeter method is used for measuring the power in three-phase, three-wire systems. It is applicable to both balanced and unbalanced loads and can be used in star (Y) or delta (Δ) connected systems.

In a star connection, the wattmeters are connected with their current coils in series with two of the lines and their voltage coils between the third line and the other two lines. The power readings from the two wattmeters are summed to get the total power.

Yes, the two wattmeter method can be used for both balanced and unbalanced loads, making it a versatile tool for three-phase power measurement.

The two wattmeter method is versatile, simple to implement, and provides accurate power measurements. It is applicable to various types of three-phase systems, both balanced and unbalanced.

One limitation is the complexity of measurements and calculations in delta-connected systems. Another is the difficulty in accessing the neutral point in star-connected systems.