Consumption Reduction on Overhead Ground Wire and Its Influence on Line Parameters

The article introduces the mechanism to cause power loss of overhead ground wire and methods to lower such loss.It studies how grounding method of the ground wire affects electric parameters of the overhead transmission line.It addresses,through PSCAD/EMTDC simulation,the importance to distinguish different grounding methods of ground wire when calculating zero-sequence parameter of the line by classical theory for the purpose to get accurate parameters.Moreover,it discusses the influence on relay protection of the transmission line.