Power Factor Meter
The power factor of an A.C circuit can be calculated from the
following relation by measuring the current, voltage and power. I.e. cosΦ =
P/VI.
This method of determining the power factor of an electrical
A.C circuit, is however, of low accuracy has a number of draw backs. Hence, it
is desirable to have an instantaneous indication of the power factor of an A.C
circuit, especially where it is varying continuously.
Therefore, a power factor meter is connected in the A.C
circuit to measure power factor which indicate directly by a single reading.
There are two types of power factor meters:
1. Electrodynamometer type of p.f meters