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Three-specific value method for diagnosing fault of SF6 electrical equipment

A technology for electrical equipment and fault diagnosis, applied in the direction of testing dielectric strength, measuring devices, instruments, etc., can solve the problem of lack of unified judgment rules, and achieve the effect of stable nature and easy detection

Inactive Publication Date: 2012-01-18
ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD
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Problems solved by technology

[0004] To overcome SF 6 The decomposition component analysis method does not have a unified judgment rule when judging the type, nature, degree and development trend of insulation defects. The present invention provides a method for SF 6 Three-ratio method for fault diagnosis of electrical equipment. The characteristic components selected by this method can not only comprehensively and effectively characterize the characteristics of various insulation defects, but also have stable chemical properties and are easier to detect. Established decomposition component ratio method for insulation defect identification Can accurately judge the type, nature, degree and development trend of insulation defects

Method used

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  • Three-specific value method for diagnosing fault of SF6 electrical equipment
  • Three-specific value method for diagnosing fault of SF6 electrical equipment
  • Three-specific value method for diagnosing fault of SF6 electrical equipment

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Embodiment Construction

[0024] Next, use the "three-ratio method for fault diagnosis of SF6 electrical equipment" to analyze a specific SF6 6 The process of implementing fault diagnosis for electrical equipment is described as follows:

[0025] 1. Use a special sampling bag to collect discharge gas from SF6 electrical equipment, and the gas collection volume is about 150mL.

[0026] Take again after 12 hours, and the sampling volume is also 150mL.

[0027] 2. Use a gas chromatograph to detect the discharge gas, so as to conduct qualitative and quantitative analysis of the decomposed gas. The carrier gas system of the gas chromatograph uses high-purity He (99.999%) as the carrier gas. The injection and sampling system is connected by a Teflon-lined hose. The whole system has high-efficiency corrosion resistance and chemical inertness to ensure the integrity and accuracy of the sample; the six-way valve sampling technology is used to strictly control the sample injection volume. The standard gas is ...

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Abstract

The invention discloses a three-specific value method for diagnosing a fault of SF6 electrical equipment. In the method, CF4, CO2, SO2F2, SOF2 and SO2 are selected as SF6 partial discharge decomposition feature components, a decomposition component specific value method for identifying an insulation defect of the SF6 electrical equipment is established, and different insulation defects can be primarily identified by using differences of feature decomposition component specific values, namely CF4 / CO2, SOF2 / SO2F2 and (SOF2+SO2F2) / (CO2+CF4). The serious degree of the insulation defects is determined by the gas generation rate of the feature decomposition components, and the development tendency of the insulation defects is determined by using the gas generation change rate of the feature components. Compared with the prior art, the method has the advantages that: the feature components have stable performance and are easy to detect; the partial discharge fault type of the SF6 electrical equipment can be accurately identified; and a determination basis can be provided for the serious degree and the development tendency of the insulation defects of the SF6 electrical equipment.

Description

technical field [0001] The present invention relates to SF 6 Electrical equipment fault diagnosis technology, specifically for SF 6 Three-ratio method for fault diagnosis of electrical equipment. Background technique [0002] Sulfur hexafluoride (SF 6 ) gas has excellent physical and chemical properties and insulation and arc extinguishing performance. As an insulating medium, it can greatly reduce the size of the equipment and improve the insulation strength. Therefore, it is widely used in power transmission and distribution equipment. But when SF 6 When there are insulation defects inside the electrical equipment, it will cause different degrees of partial discharge, and further development will lead to insulation flashover, causing equipment accidents, causing large-scale power outages, and causing adverse consequences for the safe and economic operation of the power grid. Judging from the operation situation in recent years, there have been many flashover and breakd...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01R31/12
Inventor 黄云光朱立平余志祥谭学园樊雄伟林朝扶梁裕庆黄洁文
Owner ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD
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