Induced Voltage and Current in Parallel Transmission Lines: Causes and Concerns

Induced voltage and current in a deenergized transmission line caused by other lines nearby can be caused by electric-field and magnetic-field induction. These voltages and currents present a serious work hazard for line-crew personnel. Proper understanding of the phenomenon involved and identification of the associated hazards are necessary to safely perform deenergized line work. The purpose of this paper is to clarify some of the misconceptions that have been prevalent in the industry for many years as well as to expand on the test data available in literature. This paper discusses, in simple terms, the relevant parameters that affect the magnitude of the induced voltage and current as well as the work hazards they create.