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Why Lightning arrester used? Can we use piece of iron as a
core material of transformer, if No, why? In CRGOSS
material what is meaning of cold rolled grain oriented? Why
Impegrenation of Transformer is done? Properties of
Insulator? what is phase angle? Testing of transformers
(Routine & Monthly)?
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Answer Posted / rahul thakur
Lightning arrester is used to provide path to unwanted excessive currents due to lightning strokes,to the earth which is nearly equivalent to zero potential.
Iron may be used but it will lead to high reluctance path and hence a greater losses like hysteresis loss and eddy current loss.
Cold rolled grain oriented means that if the path of flow of magnetic field is along the rolling direction,minimum reluctance is offered.
phase angle is the angle by which the emf induced in the secondary side lags the current.
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