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How to calculate knee point voltage?
Describe its purpose for differential protection.
10 % increase in voltage gives you 50 % increase in excitation current is called knee point voltage.
To measure this first demagnetise the CT and apply voltage gradually from secondary keeping primary winding open circuited.
While doing this above phenomeneo will be observed.
To measure this first demagnetise the CT and apply voltage gradually from secondary keeping primary winding open circuited.
While doing this above phenomeneo will be observed.