Method for measuring three-dimensional power-frequency electric field on basis of curve integral of equivalent charges on surfaces of transmission conductors

Abstract

A method for measuring a three-dimensional power-frequency electric field on basis of curve integral of equivalent charges on surfaces of transmission conductors includes acquiring relevant parameters of intensity of the three-dimensional power-frequency electric field of a transmission line at first; then building a three-dimensional model for the transmission line hung at different altitudes on the basis of a conductor catenary equation; determining the actual height of the corresponding conductor located at an optional position of the transmission line within a span; further obtaining the equivalent charges on the surface of the corresponding conductor located at the optional position of the transmission line within the span by a curve integral method for the equivalent charges on the surfaces of the conductors of the transmission line hung at the different altitudes; and finally, computing the intensity distribution condition of a space electric field generated by a multi-conductor system according to a field intensity superposition principle when the conductors at two ends of the span have different altitudes. By the aid of the method, an actual spatial erection condition of the high-voltage power line can be truly reflected, and the method is favorable for accurately computing the intensity of the three-dimensional space electric field of the high-voltage transmission line, and provides a reliable basis for evaluating an electromagnetic environment of the transmission line.

Description

technical field [0001] The invention relates to a method for measuring a three-dimensional power frequency electric field of a transmission line, in particular to a method for measuring a three-dimensional power frequency electric field based on the integral of the equivalent charge curve on the surface of the wire when the conductors at both ends of the span of an overhead transmission line are not of the same height. Background technique [0002] With the continuous development of my country's economic construction, users' demand for electricity and other energy sources is showing a rising trend, resulting in the continuous improvement of the voltage level of my country's transmission lines and the increasing transmission power. Running overhead transmission lines generate charges on the conductors, and the charged conductors excite electric fields in the surrounding space. The electric field intensity in the space around the transmission line, especially the electric fiel...

AI Technical Summary

Problems solved by technology

[0003] For the calculation of the equivalent charge on the surface of overhead wires, the existing theories mostly use the average height of the wires or the minimum height of the wires to the ground as the calculation height, simplify the actual transmission line to an infinitely long straight wire parallel to the earth, and establish the spatial electric field strength around the transmission line The two-dimensional calculation model, ignoring the influence of the sag and span of overhead conductors on the calculation results of electric field strength

The two-dimensional calculation model of electric field strength is difficult to evaluate the influence of factors such as conductor weight, conductor load, stress, and sag of long-span EHV / UHV transmission lines on the calculation of space electric field strength

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