Research On SF₆Thermal Decomposition And Characteristic Components Under Various Overheating Fault

Overheating failure is a common type of failure in the Gas Insulated Equipment,specific performance of the local thermal stress concentration within the device willcause the raise of the temperature. The main insulating medium sulfur hexafluoride（SF₆）will react with the material in high temperature region. The reaction process, the typeof the reaction product, the generation rate are all closely related to the type of fault andthe severity. In this article, follow the idea of based on the gas decompositioncomponent of Partial Discharge detection method, a model was made to carry outresearch on SF₆decomposition product forming process under overheat failure, and findout relationship of the decomposition mechanism, the decomposition rate of productformation, and to find the effective characterization fault type decomposition of gaseouscomponents.This article starts with the idea of SF₆gas decomposition components fromoverheating fault detection, and create overheating faults typical model according to thecharacteristics of common superheated gas insulated equipment failure, combined withgas chromatography and mass spectrometry techniques, carried out overheating fault ofSF₆gas decomposition product detection. This mainly work of this article is as follows.â‘ Successful developed the experimental apparatus that can be used to simulate theoverheating fault of Gas Iinsulated Equipment, and design physical defect model tosimulation the common overheating failed in gas-insulated equipment, developed thetemperature control system to achieve precise control of the failure temperature, thecombination of the temperature distribution within the finite element method ofexperimental apparatus, the results show that the developed overheating fault simulationsystem can effectively simulate early local high temperature effects of overheating fault.â‘¡SelectChromatography-Mass Spectrometry and the development of analyticalmethods can effectively achieve the detection of SF₆decomposition components. TheCP-Sil5CB capillary column can separate the SF₆decomposition component, usingstandard standard gas decomposition component to develop a standard mass spectra andstandard curve, and debug correlation analysis, the decomposition component ofqualitative and quantitative detection of SF₆thermal decomposition characteristics ofcomponents of the qualitative and quantitative detection laid the foundation.â‘¢Verify the performance of the simulation platform by a series of test, experimentalize the SF₆thermal decomposition in the developed overheating faultsimulation system, initial access to four different faults temperature SF₆overheatingdecomposition characteristics. Experiments show that overheat Fault simulation systemdeveloped gas-insulated equipment analog overheating fault, SF₆will decompose inoverheating fault under the main product of the decomposition of CO₂, SO₂F₂, SOF₂,SO₂, SOF₄and H₂S, different decomposition characteristics under different faulttemperature, the lower the temperature and the fault, SF₆decomposition characteristicsof components reached saturation, the shorter the time.