Dear all,
For CT adequecy check i have calculated the required kneepoint voltage of a CT as per the formula given below (For AREVA Micom relays, formulas used as per AREVA manual)
Vk required = k*(Rct+2Rl)
where k=0.14*(If*X/R) {when (If*X/R) less than 500}
k = 70 {when (If*X/R) greater than 500 but less than 1200}
In our case i have calculated the If*X/R value as per the Data available and it goes beyond 1200(1205 for 1 application and 1630 for other application)
In this case what will be the 'K' value.
Please guide me.
where
If -max through fault current.
X/R - X/R ratio.
Rct - CT secondary resistance.
Rl - lead resistance.
CT Dimensioning K Factor
Re: CT Dimensioning K Factor
