Electric field homogenization method of superconducting GIL insulator based on surface gradient conductance

Abstract

The invention discloses an electric field homogenization method of a superconducting GIL insulator based on surface gradient conductance, and the method achieves the electric field optimization through the regulation and control of the surface conductance distribution of a circular truncated cone insulator. The method comprises the following steps: (1), establishing an axial coordinate system of the insulator; (2), enabling the surface electrical conductivity sigma(z) of the insulator and the axial coordinate z of the insulator to meet an expression: sigma(z)=k(z-z<0>)^2+sigma(0), wherein k isa parameter that needs to be optimized in the calculation, S / m2; z<0> is the coordinate of the bottom surface of the insulator, m; sigma(0) is the bottom surface conductivity of the insulator, S / m; (3), setting k to n different values, wherein n is not less than 2; (4), calculating the electric field distribution of the insulator in the axial direction at the DC voltage m kV using an AC / DC modulein the COMSOL Multiphysics software; (5), selecting the optimal parameter k according to the simulation result when the uniformity of the overall distribution of the electric field is the highest, i.e., constructing the optimal gradient distribution of surface conductivity. At this time, the effect of homogenizing the electric field is the best.

Description

technical field [0001] The invention belongs to the field of high-voltage equipment design and manufacture, and in particular relates to an electric field equalization method for superconducting GIL insulators based on surface gradient conductance. Background technique [0002] So far, high-temperature superconducting (HTS) technology has attracted widespread attention due to its many advantages. At the same time, gas insulated line (GIL) has also made great progress in practical application, and its electrical design can be called superconducting gas insulated transmission line (S-GIL) in HTS system. According to the research status and operation experience of traditional GIL, under the DC electric field, the charges tend to accumulate on the surface of the insulator during long-term operation, and the electric field distortion at the triple junction of the high-voltage electrode, the gas phase, and the surface of the insulator will lead to partial discharge, and even flash...

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Problems solved by technology

According to the research status and operation experience of traditional GIL, under the DC electric field, the charges tend to accumulate on the surface of the insulator during long-term operation, and the electric field distortion at the triple junction of the high-voltage electrode, the gas phase, and the surface of the insulator will lead to partial discharge, and even flash along the surface of the insulator. network, which greatly threatens the safe operation of the entire system

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