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- To isolate the current and potential circuits
- To reduce power loss during loading
- For meters having low current ratings
- To test meters having a large current rating
Answer (Detailed Solution Below)
Option 2 : To reduce power loss during loading
Detailed Solution
Download Solution PDFPhantom Loading:
- 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 watt meter/energy meter see 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 percent,) under phantom loading.
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Solution:
Phantom loading for testing of energy meters is used to reduce power loss during loading.
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