Nalder Lipman Moving-iron Power Factor Meter
Nalder Lipman Moving-iron Power Factor
Meter are more efficient in working as compared to electrodynamic
power factor meters. These power factor meters are used on three phase
supply. Its construction and working are very simple. So, the construction
and working of this power factor meter is written below:
Construction
Its moving system holds
three iron elements. These three elements carries iron cylinder. These
elements are mounted on a shaft and these are separated with one another with non-magnetic
distance pieces. The shaft carries the damping vanes and a pointer.
These three elements are at 120 degrees to each other. Each iron element is
magnetized with their individual voltage coils named as B1, B2 and B3. These
are connected in a star connection with the supply lines. The two parallel F1
and F2 of a single current coil is connected on a line of supply.
Working
The whole system is free to move between the two parallel
halves. These meters read the power factor directly from the supply. The
phase angle φ is produced in a moving system. The deflection Θ is
equal to phase angle and the pointer deflects on a scale.
Advantages
This instrument is not affected by the variations in voltage and
in wave forms in power supply.
Rotating magnetic field is not produced so the moving
system deflects properly.