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knee point of a protection

5/28/2014 2:35 PM
Chetan2490 Posts: 149 Rating: (16)	Dear Friends, how we calculate the knee point of a protection and metering CT and what is the testing procedure?
Chetan2490 Posts: 149 Rating: (16)
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5/28/2014 3:34 PM	Rate (0)
Madhava Silver Member Joined: 11/26/2011 Last visit: 4/11/2025 Posts: 508 Rating: (23)	Chetan2490 Dear Friends, how we calculate the knee point of a protection and metering CT and what is the testing procedure? Please refer to this post -Link -->

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5/29/2014 12:18 PM
ashishmistry390 Posts: 21 Rating: (0)	Chetan2490 Dear Friends, how we calculate the knee point of a protection and metering CT and what is the testing procedure? Dear Sir, To calculate knee point voltage of current transformer by formal Vknee point = Isecandary(Rct+ Rcable+ Rburden) where Rct= resistenc of current transformer Rcable =resistenc of cable =2Rcable Rburden =burden of relay IF Vknee point< manufacture voltage of current transformer current transformer is good IF Vknee point> manufacture voltage of current transformer current transformer must be change. Regards, Ashish Mistry
ashishmistry390 Posts: 21 Rating: (0)
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5/29/2014 5:57 PM
@nkur Posts: 202 Rating: (16)	Chetan2490 Dear Friends, how we calculate the knee point of a protection and metering CT and what is the testing procedure? Hi There First of all you need to have all the data,that the RCT vale from power trans.,voltage,current Isc etc from that one can calculate the knee voltage for CT
@nkur Posts: 202 Rating: (16)
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5/29/2014 6:03 PM
IBN-Service Posts: 8946 Rating: (1000)	Chetan2490 Dear Friends, how we calculate the knee point of a protection and metering CT and what is the testing procedure? You boys rewind here a list of questions from a final examination! Bad stile.
IBN-Service Posts: 8946 Rating: (1000)
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5/30/2014 8:08 AM	Rate (0)
Blue Moderator Platinum Member Joined: 4/21/2006 Last visit: 1/27/2025 Posts: 510 Rating: (24)	Thread is closed. Have a look at the other thread: CT Knee point voltage calculation

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