CT pase angle error.
CT pase angle error.
(OP)
I have 3CTs which are passing current signals to SEL351S relay. When I am measuring the current phasors in relay they are showing following values:
A B C N G
I MAG (A) 6.604 6.734 7.331 0.000 13.759
I ANG (DEG) 174.51 52.14 114.17 0.00 113.30
My Ia, Ib and Ic are not balanced. What could be the problem? is there any problem with CTs or with the connection of CTs?
Thanks
A B C N G
I MAG (A) 6.604 6.734 7.331 0.000 13.759
I ANG (DEG) 174.51 52.14 114.17 0.00 113.30
My Ia, Ib and Ic are not balanced. What could be the problem? is there any problem with CTs or with the connection of CTs?
Thanks






RE: CT pase angle error.
RE: CT pase angle error.
RE: CT pase angle error.
Sketch the current phasors and you will see that C phase is 180 degrees from where you would expect it and the ground (residual) current is equal to twice C phase. Residual = A+B+C. For balanced currents A+B+C= 0 and A+B = -C. If C is backwards, A+B+(-C) = -2C.
RE: CT pase angle error.