The questions of earthing switch switching induced current are discussed in this paper
and the operating mode is summarized.Feature of static and electromagnetism induction of common-tower double-circuit lines is presented.According to the relevant international and domestic standards
the testing method and parameter of ES switching induced current have been summed up
and the application situation of ES switching induced current and products situation in China are recommended.Suggestion of paying great attention to the question of ES switching induced current is proposed
and choosing the ES based on calculating result is also put forward.