What is meant by knee point voltage of CT?

DWQA QuestionsCategory: (EE) Power SystemWhat is meant by knee point voltage of CT?
Raja asked 6 years ago
4 Answers
Stephen answered 6 years ago

Knee point voltage is calculated for electrical Current transformers and is very important factor to choose a CT. It is the voltage at which a CT gets saturated.(CT-current transformer).

feru answered 6 years ago

The knee point is defined as the voltage at which a 10% increase in appliedvoltage increases the magnetizing current by 50%. For voltages greater than theknee point, the magnetizing current increases considerably even for small increments in voltage across the secondary terminals.

dara answered 6 years ago

Knee point is that point, in the voltage vs magnetizing current characteristics of a CT,beyond which the CT current changes drastically with respect to change of voltage.
Upto Knee point the change nature is linear in charateristics and beyond knee point the curve  looses its linearity property.