SF6 insulation direct-current casing pipe fault diagnosis system and SF6 insulation direct-current casing pipe fault diagnosis method

Abstract

The invention discloses an SF6 insulation direct-current casing pipe fault diagnosis system, which comprises a preventive testing instrument, an on-line monitoring device, a fault diagnosis backstage and a communication device. The invention also discloses a diagnosis method based on the system. The method comprises the following steps: (1) extracting characteristic quantity of fault diagnosis of an SF6 insulation direct-current casing pipe; (2) establishing a diagnosis vector of the SF6 insulation direct-current casing pipe fault diagnosis system; (3) establishing a fault type incidence matrix of the SF6 insulation direct-current casing pipe fault diagnosis system; and (4) carrying out the fault diagnosis with the SF6 insulation direct-current casing pipe fault diagnosis system. With the adoption of the SF6 insulation direct-current casing pipe fault diagnosis system and the SF6 insulation direct-current casing pipe fault method, comprehensive and systematic fault diagnosis of the SF6 insulation direct-current casing pipe is carried out based on preventive testing data and on-line monitoring device data; and meanwhile, the condition that the fault diagnosis is carried out only aiming at preventive testing or on-line monitoring data at present is broken through, so that the overhaul ability of a direct-current system is improved.

Description

technical field [0001] The invention relates to the technical field of DC system maintenance, in particular to a SF 6 A fault diagnosis system for an insulating DC bushing and a diagnosis method using the fault diagnosis system. Background technique [0002] Currently domestic SF 6 (Sulfur hexafluoride) insulating DC bushing is an important primary equipment of the DC transmission converter station, which realizes the connection between the indoor converter valve equipment and the outdoor DC field equipment. Current Nelson River HVDC project due to SF 6 There were 14 accidents caused by insulating bushings. For the same reason, 4 accidents occurred on the Pacific connection line, 15 accidents occurred in the Itaipu Hydropower Station, and 3 accidents occurred in domestic Yunguang and other DC projects. It can be seen that the development of SF 6 The fault diagnosis of insulating DC bushing is of great significance to improve the reliability of DC system. [0003] Current...

AI Technical Summary

Problems solved by technology

However, preventive trials, on-line monitoring alone SF 6 The fault diagnosis of insulating DC bushings is generally based on the type of fault to analyze the cause of the possible fault, and then test the relevant data for the possible cause of the fault to find out the real fault, thus realizing the low efficiency and poor reliability of the fault The diagnostic process, while for the comprehensive consideration of preventive tests, online monitoring for SF 6 Condition assessment of insulating DC bushings has not yet been carried out

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