Merits of Two Wattmeter Method for 3 Power Measurement:
1) It is used for balanced as well as unbalanced load.
2) For the star type load, it is not necessary to connect the neutral point for connection of wattmeter.
3) Delta load need not to be opened to connect the wattmeter.
4) For balanced loads, it possible to measure power factor along with the power.
5) Only two watt meters are required which reduces cost of instruments
6) It is possible to measure reactive volt-amperes for balanced loads also.
7) The circuit connections are independent of load connection.
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