Transmission Line Impedance 1

[strongarm11]

In a 3-Phase power transmission line, is the overhead ground wire has an effect on the overall transmission line impedance? Kindly enlighten me. Thank you.

 

[jghrist]

The OGW has no effect on the positive-sequence reactance but it does have a large effect on the zero-sequence reactance.

 

[strongarm11]

Thanks for the reply jghrist. My next question is: How to determine the zero sequence reactance with respect to the size and orientation of the overhead ground wire?

 

[davidbeach]

Check the Symmetrical Components section of faq238-1287. The Anderson book goes into great detail and the Blackburn book may be sufficient. Many Power System Analysis texts referenced will also include some information.