Apparent power transducer for three-phase three-wire system
In a newly developed transducer apparent power is measured by using a multiplier, in which the AC component of the output is used. For a three-phase three-wire system, two multipliers are used according to the so-called ‘two wattmeter’ method. The AC output components are +30° and –30° phase-shifted, respectively, and then the difference is converted to a DC signal which corresponds to the total apparent power.
