Working of Moving-Iron Power Factor Meter

Working of Moving-Iron Power Factor Meter Points : Working of Moving-Iron Power Factor Meter Working of Moving-Iron Power Factor Meter The alternating flux produced by coil B interacts with the fluxes produced by the three current coils and causes the moving system to take up a position determined by the power factor angle of the load. However, the instrument is calibrated to read ‘he power factor cos Φ directly instead of Φ of the iron vanes from the line.

Because of rotating field produced by coils R, Y and B, there is a slight induction — motor action which tends to continuously turn the moving iron in the direction of the rotating flux. Hence, it becomes essential to so design the moving iron as to make this torque negligibly small i.e. by using high-resistance metal for the moving iron in order to reduce eddy currents in it.