Abstract
Mutual coupling of multi-circuit lines affects distance relay measurements during earth faults which include zero sequence currents. The difficulty stems from the fact that the lines are mutually coupled in their zero-sequence circuits. This effect can cause distance protection on healthy circuits to mal-operate under fault conditions when mutual coupling was not considered and when calculating impedance protection settings. The multi-circuit lines need not be of the same voltage levels to experience mutual coupling, and some coupling exists even for lines that are not on the same tower. This paper studies the effects of mutual coupling on parallel transmission lines and how different system configurations affect the protection relay settings. Finally, the paper describes using simulations the effects off mutual coupling compensation to evaluate the performance of the protection system.
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