Two wattmeters connected to read the total power in a 3-phase system supplying a balanced load rea 10.5 kW and – 2.5 kW respectively. Calculate the total power and the power factor. Draw suitable phaso diagram, explain the significance of (i) equal wattmeter readings ; and (ü) a zero reading on one wattmeter. |Ans. 8 kW ; 0.3348 (lag) (i) unity p.f., tii) 0.5 p.f

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