Stable isotopic tracer method-based research method for simulating SF6 overheating decomposition reaction

A technology of isotope tracing and decomposition reaction, applied in the field of simulating SF6 thermal decomposition reaction, can solve the problems of unclear decomposition reaction process, hinder the identification and diagnosis of decomposition products and internal faults of electrical equipment, etc., and achieve the effect of accurate detection

Pending Publication Date: 2022-04-12
STATE GRID HUBEI ELECTRIC POWER RES INST +1
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Problems solved by technology

[0003] Currently, the relevant SF 6 The decomposition reaction process under the action of overheating is still unclear, which greatly hinders the implementation of the method based on the identification of decomposition products and the diagnosis of internal faults in electrical equipment

Method used

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  • Stable isotopic tracer method-based research method for simulating SF6 overheating decomposition reaction
  • Stable isotopic tracer method-based research method for simulating SF6 overheating decomposition reaction
  • Stable isotopic tracer method-based research method for simulating SF6 overheating decomposition reaction

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Embodiment 1

[0029] The invention proposes an experimental research method based on an oxygen isotope tracer method for the effect of trace moisture on the superheated decomposition of SF6 and the mechanism of action. First, SF 6 The decomposition of cellulose is affected by many factors, such as temperature, air pressure, moisture content and so on. in SF 6 In gas-insulated equipment, internal materials release H during operation 2 O. Therefore, it is necessary to study the effect of different moisture content on SF 6 The impact of decomposition. Using the isotope tracer method, inject different contents of H 2 18 O, after fully reacting for a period of time in a superheated state, detect in the product by GC / MS means 18 The change law of the ratio of O, on the one hand, can strongly explain the H 2 Whether O participates in the formation process of the product and provides oxygen element for it; on the other hand, it can show the influence of the moisture content on the formation...

Embodiment 2

[0036] an isotope-based oxygen 18 o 2 , to the experimental research method of SF6 overheating decomposition product formation process, described method specifically comprises:

[0037] (1) Before each experiment, open the closed tank, and use absolute ethanol to completely wipe the inner wall of the tank, the inner wall of the lid and the surface of the local heat source, and wipe off the possible residual moisture and product residue after the previous experiment to avoid interference from impurities the next experiment;

[0038] (2) Install the local incandescent heat source inside the tank, cover and fix the lid of the tank, and then use a vacuum pump to evacuate the air chamber to a vacuum. In order to fully discharge the remaining impurities and a small amount of air inside, use SF with a purity of 99.999% 6 The gas is filled into the air chamber, and after reaching 0.1MPa, it is left to stand for 10 minutes, and then pumped to vacuum again, and the whole process is r...

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Abstract

The invention provides a research method for simulating an SF6 overheat decomposition reaction based on a stable isotopic tracer method, which comprises the following steps of: constructing an SF6 insulation equipment local overheat experiment platform, controlling a fault temperature by using a temperature controller, and researching accurate injection of H218O and 18O2 with different concentrations. The method comprises the following steps: removing the influence of impurities in the air and impurities remaining on the surface of an experimental apparatus on the experiment, heating for a period of time, collecting the reacted mixed gas in the experimental apparatus, and analyzing the proportion of gas components and isotope compounds by GC/MS, thereby researching the interaction of trace oxygen and water and SFx in the SF6 thermal decomposition process. And analyzing the formation mechanism of the SF6 decomposition product. The experimental platform is designed according to the internal overheating fault condition of the gas insulation equipment so as to simulate the decomposition condition of SF6 under an actual fault.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a simulated SF based on a stable isotope tracer method. 6 Methods for the study of superthermal decomposition reactions. Background technique [0002] SF 6 Gas has excellent insulation and arc extinguishing properties, and is widely used in gas-insulated electrical equipment, such as gas-insulated switchgear (GIS), gas-insulated transmission line (GIL), etc. When SF 6 When gas-insulated electrical equipment has a discharge failure, the originally chemically stable SF 6 The gas will be decomposed into low-fluorine sulfide SFx (x=1~5), impure SF6 gas or poor sealing of gas-insulated electrical equipment will further react these low-fluorine sulfides with mixed impurities to form SO 2 f 2 、SOF 2 , SO 2 、SOF 4 , HF and other complex components. There is a close relationship between these reaction products and the characteristics of discharge faults. Therefore, in rec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12G01N30/02G01N30/06G01N30/86
Inventor 何清李晓辉王伟邓万婷胡丹辉胡然曾福平
Owner STATE GRID HUBEI ELECTRIC POWER RES INST
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