A method for detecting internal faults of c-c4f8 mixed gas insulated electrical equipment

A technology for electrical equipment and mixed gas is applied in the field of internal faults of c-C4F8 mixed mixed gas equipment, which can solve problems such as failure to detect electrical equipment failures, and achieve the effects of eliminating hidden dangers, simple detection methods and low detection costs.

Inactive Publication Date: 2011-11-30
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Problems solved by technology

[0003] Chinese patent 200910227266.8 provides a method for detecting internal faults of SF6 insulated electrical equipment using a gas chromatograph, but it is only meaningful for equipment using SF6 gas
Can not be used for fault detection of c-C4F8 mixed gas-insulated electrical equipment

Method used

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  • A method for detecting internal faults of c-c4f8 mixed gas insulated electrical equipment
  • A method for detecting internal faults of c-c4f8 mixed gas insulated electrical equipment

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0019] figure 1 It is a schematic diagram of the analysis process for detecting equipment faults by gas chromatography-mass spectrometry in the present invention. Such as figure 1 As shown, the present invention is a method for detecting internal faults of c-C4F8 mixed gas insulated electrical equipment by gas products in a kind of equipment, which comprises the following steps:

[0020] Step 1: Use a sampling bottle to extract a 200mL gas sample from the electrical equipment for use;

[0021] Step 2: Select a capillary column with a length of 60 m and an inner diameter of 0.32 mm as the chromatographic column. The chromatographic carrier gas is helium with a purity greater than or equal to 99.99%. The carrier gas flow rate is 1 mL / min. The injection split ratio was 20:1. When the gas detector adopts a thermal conductivity detector, the det...

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Abstract

The invention relates to a method for detecting internal faults of c-C4F8 mixed gas insulated electrical equipment. The method is characterized by comprising the following steps of: judging whether the faults occur or not and determining the types of the faults according to product components generated after the faults of the electrical equipment insulated by the mixed gas of c-C4F8 and N2 or CO2or CO or CF4 occur, and if only C2F4 gas and C3F6 gas are detected, indicating that the overheating faults of the equipment occur; if C2F6 gas, the C2F4 gas, C3F8 gas and the C3F6 gas are detected simultaneously, indicating that the discharging faults of the equipment occur; and judging whether the faults are serious and needed to be maintained or not according to the change condition of the content of products.

Description

technical field [0001] The invention relates to a method for internal faults of c-C4F8 mixed gas equipment, in particular to a method for c-C4F8 and its mixed gas with N2 or CO2 or CO or CF4 to insulate internal faults of electrical equipment. Background technique [0002] SF6 gas has good insulation ability, arc extinguishing ability, chemical stability and non-toxicity, so it is widely used in gas-insulated equipment, such as gas-insulated transformers, gas-insulated circuit breakers, gas-insulated transmission pipelines, etc. However, pure SF6 gas is very sensitive to electric field inhomogeneity and has high requirements for equipment processing; and the discharge decomposition products of SF6 gas, such as SO2F2, SOF2, SF4, SF2, H2S, SOF4, etc., are highly toxic substances, which are harmful to human health. In addition, the greenhouse effect of SF6 gas is very large, its global warming potential (GWP) is about 23,900 times that of CO2 gas, and its lifespan in the atmosp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00G01N30/02
Inventor 张国强李康
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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