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Method for monitoring insulation state of epoxy resin insulating media in sulfur hexafluoride electrical device

An electrical equipment, sulfur hexafluoride technology, applied in the direction of measuring devices, testing dielectric strength, instruments, etc., can solve the problems of insulation breakdown, power system operation accidents, low sensitivity of epoxy resin insulation defects, etc., to achieve stable detection, Accurate detection results and sensitive identification

Inactive Publication Date: 2015-01-21
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Sulfur hexafluoride (SF 6 ) The basin type insulators and other epoxy resin insulating media widely used in electrical equipment will be irreversibly damaged once discharged, which will eventually cause insulation breakdown and cause serious power system operation accidents
SF 6 When partial discharge occurs in electrical equipment, complex chemical reactions will occur to generate SO 2 、SOF 2 , SO 2 f 2 and other gases, but it is impossible to judge whether the discharge phenomenon is related to the epoxy resin insulating medium according to this kind of gas; at the same time, due to the production of SF 6 CF will inevitably be mixed in the process 4 and impurities such as CO, using CF 4 and CO and other conventional C-containing substances to judge SF 6 The sensitivity to epoxy resin insulation defects inside electrical equipment is not high

Method used

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  • Method for monitoring insulation state of epoxy resin insulating media in sulfur hexafluoride electrical device
  • Method for monitoring insulation state of epoxy resin insulating media in sulfur hexafluoride electrical device
  • Method for monitoring insulation state of epoxy resin insulating media in sulfur hexafluoride electrical device

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment one: gas chromatography GC

[0030] (1) Use a gas distributor to dilute the COS standard gas, establish a standard curve with a concentration gradient of 0.114, 0.550, 1.500, 4.00, 8.00, 10.00, 20.00, and 50.00 μL / L, and pass the diluted gas into the gas chromatograph in the detection. Repeat the measurement 3 times.

[0031] Determination conditions: Taking the gas chromatography with gaspro capillary column and matching PDD detector as an example, TECPφ3×3m PORAPAK Q 0.53mm×30m PORAPAK Qφ3×3m capillary column is used. The specific parameters are set as follows:

[0032] Gas connection:

[0033] A. Carrier gas: helium (above 99.999%), output pressure 0.4MPa

[0034] B. Driving gas: Nitrogen, the output pressure of driving gas is 0.3MPa

[0035] Injection pressure: 0.05MPa

[0036] The column furnace was initially at 35°C, kept for 8 minutes, then raised to 200°C at a rate of 10°C per minute, and kept for 5 minutes.

[0037] Based on the above ...

Embodiment 2

[0045] Embodiment 2: Gas chromatography-mass spectrometry GC-MS

[0046] (1) Use a gas distributor to dilute the COS standard gas, establish a standard curve with a concentration gradient of 0.114, 0.550, 1.500, 4.00, 8.00, 10.00, 20.00, and 50.00 μL / L, and pass the diluted gas into the analytical instrument for analysis. detection. Repeat the measurement 3 times.

[0047] Determination conditions:

[0048] A gas pro capillary column, model J&W, 30 m×0.32 mm×0.35 μm was selected. The chromatographic column has a good separation effect and can achieve the same decomposition product as the background SF 6 Maximum separation. The specific parameters are as follows:

[0049]

[0050] Based on the above parameter settings, COS can be characterized as:

[0051]

[0052] get figure 2 The standard curve for COS is shown:

[0053]

[0054] (2) Gathering gas samples: According to DL / T 1032-2006 "Sampling Method of Sulfur Hexafluoride Gas for Electrical Equipment", SF6...

Embodiment 3

[0059] Embodiment three: Fourier transform infrared spectroscopy FTIR

[0060] (1) Use a gas distributor to dilute the COS standard gas, establish a standard curve with a concentration gradient of 0.114, 0.550, 1.500, 4.00, 8.00, 10.00, 20.00, and 50.00 μL / L, and pass the diluted gas into the analytical instrument for analysis. detection. Repeat the measurement 3 times. The specific parameters of the Fourier transform infrared spectrometer used are as follows:

[0061]

[0062] Based on the above settings, COS can be characterized as:

[0063]

[0064] get image 3 The standard curve for COS is shown:

[0065]

[0066] (2) Collect gas samples: According to the method specified in DL / T 1032-2006 "Sulfur Hexafluoride Gas Sampling Method for Electrical Equipment", SF6 gas from a GIS gas chamber of Guangdong Power Grid Company was collected as the sample to be tested.

[0067] (3) Detection: The sample to be tested is passed into a Fourier transform infrared spectr...

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Abstract

The invention discloses a method for monitoring the insulation state of epoxy resin insulating media in a sulfur hexafluoride electrical device. The method comprises the steps of (1) acquiring a gas sample, wherein gas in the sulfur hexafluoride electrical device is acquired to serve as a sample to be detected; (2) detection, wherein the sample to be detected is detected with the gas chromatography, the gas-chromatography-mass spectrometry or the infrared spectroscopy to obtain analysis data of COS in the sample to be detected; (3) comparing the analysis data obtained from the step (2) with standard data of COS so that qualification and quantification of COS in the sulfur hexafluoride electrical device can be achieved and the insulation state of the epoxy resin insulating media in the sulfur hexafluoride electrical device can be judged. With COS serving as characteristic gas, whether solid insulating media, including basin-type insulators, of epoxy resin in the SF[6] electrical device are subjected to discharge erosion can be judged accurately.

Description

technical field [0001] The invention relates to a method for monitoring the insulation state of electrical equipment, in particular to sulfur hexafluoride (SF 6 ) Monitoring method of insulation state of epoxy resin insulation medium in electrical equipment. Background technique [0002] Sulfur hexafluoride (SF 6 ) The pot insulators and other epoxy resin insulating media widely used in electrical equipment will be irreversibly damaged once they are discharged, which will eventually cause insulation breakdown and cause serious power system operation accidents. Therefore, it is necessary to find an effective monitoring method for SF 6 Potty insulators in electrical equipment and other methods involving the insulation state of epoxy resin insulation media. [0003] Traditional for SF 6 The monitoring methods for the insulation state of electrical equipment include electrical methods and chemical composition analysis methods. The UHF method (UHF), the most widely used elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12G01N30/02G01N21/3504
Inventor 李丽唐念乔胜亚樊小鹏
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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