Comprehensive evaluation method for defects of basin-type insulators of ultra/extra-high voltage GIS equipment

Abstract

The invention discloses a comprehensive evaluation method for defects of basin-type insulators of ultra / extra-high voltage GIS equipment. The method comprises the following steps: determining main latent defect conditions existing on typical basin-type insulators of the GIS equipment; establishing an electric field finite element analysis program, and obtaining electric field distortion coefficients of the basin-type insulator under various defects through simulation and trial measurement; calculating electric field intensities of different radial distances of the basin-type insulator under various defects; and carrying out defect classification according to flashover types, constructing a comprehensive evaluation function of latent defects, and evaluating the defect grade of the basin-type insulator according to the evaluation function value. According to the invention, on the premise that GIS equipment is not dismounted, quantitative analysis is carried out on the latent defects of the basin-type insulator, various accidents caused by the latent defects of the basin-type insulator are reduced or avoided to a great extent, safe and reliable operation of GIS equipment and even stable operation of the whole power system are ensured, and the method has wide practicability and economical efficiency.

Description

technical field [0001] The invention belongs to the technical field of on-line detection and comprehensive evaluation of latent defects of insulators of super / ultra-high voltage GIS equipment, and specifically relates to a comprehensive evaluation method for latent defects of typical pot insulators of super / ultra-high voltage GIS equipment. Background technique [0002] In recent years, with the acceleration of social industrialization and the continuous improvement of people's living standards, in order to meet the sharp increase in electricity demand, new requirements have been put forward for the voltage level of my country's transmission network. However, gas insulated switchgear (GIS) Because of its compact structure, good insulation performance, small maintenance, high power supply reliability and many other advantages, it is widely used in EHV / UHV power systems, and it plays a vital role in power systems. [0003] As the core component in GIS, the pot insulator has the...

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Problems solved by technology

Because the qualitative analysis has a certain degree of subjectivity and ambiguity, it cannot objectively, accurately and comprehensively reflect the latent defect level of the typical pot insulators of GIS equipment, so that it cannot arrange maintenance in a timely and reasonable manner and make appropriate treatment, which leads to the failure of GIS equipment. Faults occur and affect the stable operation of the power system

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