Which of the following tests is also known as ‘phantom loading’?

Indirect loading test
No load test
Short circuit test
Direct loading test

LohaHridoy

4 views

2025-01-04 04:42

1 Answers

AhmedNazir

Option 1 : Indirect loading test

Phantom 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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4 views Answered 2022-09-04 04:29

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