Knee Point Voltage

How to calculate knee point voltage? Describe its purpose for differential protection.

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vikash798

  • Sep 3rd, 2010
 

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.

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