With a neat sketch explain working of 1 phase dynamometer type power factor meter.
asked Sep 6, 2018 in Electrical Engineering by
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Working of 1 phase dynamometer type power factor meter : The current coil is connected in series with load. Two pressure coils marked as A and B are connected across the supply terminals and take current IA and IB respectively. The current IA is in phase with supply voltage V as its circuit is resistive. While IB lags V by approximately 90 as its circuit is highly inductive. The magnetic field is produced by current coil and two pressure coils, carrying less current. Hence force is exerted on coils A and B. The coil winding are arranged such that the torques on them acts in opposite direction. When both torques on coil A and B, TA and TB respectively, become equal, the moving system becomes stationary and the pointer shows steady deflection corresponding to the power factor of the load. 

answered Sep 6, 2018 by