Monday, 13 January 2014

What is phantom loading ?

       When the current ratings of meter under test is very high , a test with actual load arrangements consume   considerable waste of power . To avoid this phantom loading is used .
         Phantom loading is consists of supplying the pressure circuit from a required normal voltage supply and the current circuit from  separate low voltage supply .It is possible to circulate the rated current through the current circuit with a low voltage supply as the impedance of this circuit is very low. In this arrangement the total power required is that due to the small pressure coil current at rated normal voltage, plus the power supplied due to the current circuit current at low voltage supply. The total power consumed by phantom loading is very small as compared to direct loading.

6 comments:

  1. what is the result of phantom loading?

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    Replies
    1. due to this u can prevent power loss n even get the more accurate readings over any meter. it prevents even heat generation

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    2. due to this u can prevent power loss n even get the more accurate readings over any meter. it prevents even heat generation

      Delete
  2. What will happen if pressure coil is also connected with a low voltage supply

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