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Keywords

doublecircuit transmission line on same tower, power transmission line, induction voltage, induction current, safety operation

Abstract

In the Northwest Economic Corridor region, the distribution lines with the low voltage ride through is built and parallel operates under high voltage lines in order to save the land occupation and improve the economic benefit. However, during the outage maintenance process of the low voltage line, the induction voltage and current generated by electrostatic effect and electromagnetic coupling of the multicircuit highvoltage transmission lines may threaten the safety of maintenance personnel. On this background, the normal operation of LuoshanLingzhou 330kV transmission line in Northwest China is taken as an example and an ATPEMTP simulation model is built in this paper. Then the variation of induction voltage and current on 380V line is compared and analyzed in the aspects of transmission line length, current magnitude, nominal height and the distance from the tower center. The magnitude of the current through human body is also calculated in different maintenance modes. The results show that the electrostatic induction voltage is mainly related to the nominal height of high voltage tower and the distance from the tower center. The electrostatic induction current is mainly affected by the nominal height of high voltage tower and the length of low voltage line. The electromagnetic induction voltage and current are influenced by the length of low voltage line, the magnitude of the operating current and the distance from the tower center. Comprehensively considered various recommended values of human physiological effects, the maintenance method of adding security grounding line is suggested to ensure the safety operation.

DOI

10.19781/j.issn.16739140.2021.01.025

First Page

216

Last Page

217

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