Calculation of Induced Voltage and Current on a Crossing Transmission Line under UHV AC Transmission Lines

The induced voltage and current occur on the crossing transmission line under the UHV AC transmission lines during the outage for maintenance of this line. These may pose a threat to the personal safety of maintenance workers. In this paper, the whole transmission line was divided into many sections. The induced voltage of each section was calculated by MATLAB program, the induced voltage on the whole line could be obtained by the superposition of the section voltages. The field measurement results show that the calculation method of the induced voltage meets the accuracy requirement. The induced voltage and current will gradually decrease when the span distance or the span angle increases. To decrease the induction between the transmission lines, the distance or angle should be increased. In order to ensure the safety of the maintenance workers, the grounding switches in both sides of the substation should be kept grounded during the transmission line maintenance, and temporary ground wire should be connected to both sides of the working point.