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Why we need to carry out knee point voltage test of current
transformer ?
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Answer Posted / satendra
There are three regions were a transformer works. They are:
1. Linear region
2.Knee point region and
3.Saturation region.
Knee point voltage is a point on the magnetizing curve of a transformer.A 10% increase in flux density(voltage) will bring in an increase of 50% in the Magnetization (Current). After the knee point voltage the transformer enters saturation region for which there is infinite Magnetization (Current), but voltage remains at the same level. This condition is seen as open circuited on the secondary. This will surely spoil the insulation level of transformer and ultimately the transformer will burn
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