Question
Download Solution PDFUnder phantom loading testing of an energy meter, the power required to test is _________ .
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe correct answer is option 4):(very low)
Concept:
- Phantom loading is used to test the wattmeter and energy meter.
- The pressure coil is supplied from a voltage source( power is negligible) and the current coil is supplied from another circuit operating at low voltage but at the required current.
- So the watt meter/energy meter sees rated voltage and rated current but the power used for testing is very low.
- This is an indirect way of the load test. Direct loading requires rated voltage and current and so power is large
- . Testing at various power factors is also easy in phantom loading
- . It requires only a phase-shifting transformer to shift the phase of voltage with respect to current. The power required is less, depending on the voltage required to send rated current( even 5 to 10 per cent,) under phantom loading.
Last updated on Jul 1, 2025
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