A Composite Insulator with Built-in Capacitive Equalizing Screen

Abstract

The invention relates to a composite insulator with a built-in capacitor voltage equalizing screen, which includes a mandrel, a capacitor voltage equalizing screen, a jacket, and fittings. The capacitor voltage equalizing screen is arranged between the mandrel and the jacket, and the fittings are arranged at both ends of the composite insulator . The capacitive voltage equalizing screen is composed of an insulating medium and multi-layer annular metal plates arranged at intervals in the insulating medium, and the metal plates at both ends of the capacitive voltage equalizing screen are respectively mechanically connected with metal fittings at both ends. The advantage of the present invention is that the capacitance of the capacitance equalizing screen is used to increase the main capacitance between the main insulation of the insulator, thereby reducing the influence of the stray capacitance around the insulator on the electric field distribution of the insulator, and the capacitance equalizing screen is forced to control the surface potential and electric field of the insulator Uniform distribution, eliminating the harm of corona phenomenon to composite insulators. The invention can be used for the rod-shaped suspension composite insulator of the power transmission line, and can also be applied to the rod-shaped pillar composite insulator used for supporting in the substation.

Description

technical field [0001] The invention relates to a high-voltage insulation technology, in particular to a composite insulator with a built-in capacitor equalizing screen. Background technique [0002] Composite insulator mainly includes three parts: mandrel, jacket and fittings. Since composite insulator is a long rod insulation structure with extremely small capacitance between poles, it is very susceptible to the influence of surrounding stray capacitance; its potential is distributed rapidly at the high-voltage end and low-voltage end. Attenuation, such a potential distribution makes the surface electric field distribution extremely uneven, and a higher electric field is generated near the high-voltage end and the low-voltage end. When the electric field strength on the surface of insulators and metal fittings exceeds the initial field strength of corona, corona will occur Discharge, and then affect the electromagnetic environment of power stations, transmission lines and ...

AI Technical Summary

Problems solved by technology

[0002] Composite insulator mainly includes three parts: mandrel, jacket and fittings. Since composite insulator is a long rod insulation structure with extremely small capacitance between poles, it is very susceptible to the influence of surrounding stray capacitance; its potential is distributed rapidly at the high-voltage end and low-voltage end. Attenuation, such a potential distribution makes the surface electric field distribution extremely uneven, and a higher electric field is generated near the high-voltage end and the low-voltage end. When the electric field strength on the surface of insulators and metal fittings exceeds the initial field strength of corona, corona will occur Discharge, which in turn affects the electromagnetic environment of power stations and transmission lines and the performance of insulating materials

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