Measurement and Instrumentation
The current coil of a wattmeter is connected to the CT of R-phase. The potential coil is connected across Y and B phases. The wattmeter measures

Active power of Y phase
Power proportional to 3 phase power if the load is balanced
Active power in R phase
Reactive power of R phase

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Measurement and Instrumentation
For power measurement of three phase circuit by two wattmeter method, when the value of power factor is less than 0.5 lagging

Both give the same readings
Pressure coil of the wattmeter will become ineffective.
One of the wattmeters will read zero
One of the wattmeter connections will have to be reversed

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