Multi-region detection system for partial discharge decomposition components of insulating gas and method thereof

Abstract

The invention relates to a multi-region detection system for the partial discharge decomposition components of insulating gas and a method thereof, which belong to the technical field of on-line gas-insulated equipment insulation monitoring. The system comprises a voltage regulator, an isolation transformer, a corona-free test transformer, a partial discharge-free protective resistor, a capacitive divider, an insulating gas discharge decomposition device, an ultrahigh-frequency antenna, an oscillograph, a gas chromatograph-mass spectrometer and the like, and the insulating gas discharge decomposition device comprises a housing, insulating sleeves, connecting rods, electrodes, valves, a vacuum meter, a gas pressure meter, a vacuum pump, an SF6 gas bottle, a pure compressed air bottle and the like. The method utilizes the system to respectively detect the discharge decomposition components of multiple regions in the insulating gas discharge decomposition device. The invention can accurately detect the components and component contents of the decomposed gas of a main gas chamber, a glow discharge region and an electron drift region and provide a standard. The invention can be widely applied to the on-line monitoring of gas-insulated equipment insulation, in particular to the on-line monitoring of GIS (gas-insulated switchgear) insulation.

Description

technical field [0001] The invention belongs to the technical field of on-line monitoring of the insulation state of gas-insulated electrical equipment, and in particular relates to a detection system and an experimental method for partial discharge decomposition components of multi-region insulating gas. Background technique [0002] Gas-insulated combined electrical appliances (GIS) have the advantages of high dielectric strength, safe and stable operation, environmental protection, long maintenance cycle, small footprint and small maintenance workload, etc., and are widely used in the construction and renovation of large and medium-sized cities. However, judging from the operation situation in recent years, there have been many problems in the operation of GIS at home and abroad, mainly due to the failure caused by the inevitable internal defects. Once a failure occurs, the closed structure of GIS makes the diagnosis and maintenance of the failure difficult. The implement...

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Problems solved by technology

The main disadvantages of this patent are: 1) the structure of the cylinder body is complicated, and the phenomenon of partial discharge can only be observed through the quartz window, which is very inconvenient; It can collect the discharge decomposition components of the main gas chamber, so the detection system can only detect the decomposition components of the main gas chamber in general, and cannot detect the decomposition components of the insulating gas in different regions; 3) the detection system The gas chromatograph is only for CO2 , SOF2, SO2 in the decomposition components of SF6 gas under partial discharge F2, CF4 have been calibrated and can only measure the concentration of these four gases in the decomposition components, which cannot reflect the type of insulation defect and The relationship between the types and contents of the decomposed components of SF6 gas cannot be qualitatively analyzed for the decomposed components in different regions, let alone the types of decomposed components and their contents in pure air under partial discharge. This is not conducive to further research on the decomposition mechanism of various insulating gases; 4) The partial discharge signal acquisition method cannot avoid external low-frequency interference signals. The low-frequency interference on site is very serious, and the partial discharge signals collected by this method cannot Accurately reflect the discharge degree of partial discharge

Therefore, this method is not deep enough for the analysis of the decomposition components of insulating gases such as SF6gas or pure air caused by PD, and cannot provide a scientific theoretical basis for the state detection and fault diagnosis of gas-insulated GIS.

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