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

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Measurement and Instrumentation
In measurement system, the function of the signal manipulating elements is to

 to perform non liner operation like clipping filtering, chopping and clamping.
 to perform linear operation like addition and multiplication.
 change the magnitude of the input signal while retaining its identity.
 change the quantity under measurement to an analogues signal.

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