What is Phantom loading ??
When the current ratings of meter under test is very high,a test with actual load arrangements consumes considerable waste of power. To avoid this Phantom loading is used:-
Phantom loading consist of supplying the pressure circuit(voltage coil) from rated voltage supply and the current circuit from a low voltage supply. Thus it is possible to circulate the rated current through with the current circuit with low voltage supply as the circuit impedance is very low.
When the current ratings of meter under test is very high,a test with actual load arrangements consumes considerable waste of power. To avoid this Phantom loading is used:-
Phantom loading consist of supplying the pressure circuit(voltage coil) from rated voltage supply and the current circuit from a low voltage supply. Thus it is possible to circulate the rated current through with the current circuit with low voltage supply as the circuit impedance is very low.
- The total power consumed by Phantom loading is very small as compared to direct loading.
- In Phantom loading arrangement energy consumption in the calibration test of watt- meter is reduced because of the absence of load in the test.
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