Method for detecting internal fault of SF6 electrical equipment by using gas chromatograph

A gas chromatograph and electrical equipment technology, applied in the field of electrical equipment failure detection, can solve the problems of unpredictable electrical equipment, whether there are hidden dangers, environmental pollution, unsuitable selection, etc., to avoid economic losses, low testing costs, and stable performance. Good results

Inactive Publication Date: 2010-06-30
PINGDINGSHAN POWER SUPPLY ELECTRIC POWER OF HENAN
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, with the rapid development of the power grid, SF 6 Gas has become the only important dielectric for EHV and UHV electrical equipment. Its technology has been used for more than 20 years, but its inspection method is mainly to detect SF 6 The moisture in the gas is mainly moisture, and the moisture content can only predict the insulation and arc extinguishing capabilities of electrical equipment, but cannot predict whether there are hidden dangers inside the electrical equipment
In the society, sensors are used to detect the decomposition gas in the equipment, but the equipment needs to be powered off, connected to the equipment, and a certain equipment air pressure must be ensured to detect. This test method is time-consuming, labor-intensive, wastes gas, and pollutes the environment. It is not suitable for use.

Method used

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  • Method for detecting internal fault of SF6 electrical equipment by using gas chromatograph
  • Method for detecting internal fault of SF6 electrical equipment by using gas chromatograph
  • Method for detecting internal fault of SF6 electrical equipment by using gas chromatograph

Examples

Experimental program
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Effect test

Embodiment 1

[0045] On March 10, 2009, SF was extracted on-site from the electrical equipment of the 220kV substation built in 20086 SF in electrical equipment 6 The gas sample is 50mL, and a stainless steel tube with a length of 2m and an inner diameter of 3mm filled with a 60-80 mesh GDX-301 stationary phase is selected as the chromatographic column;

[0046] Put the chromatographic column into the gas chromatograph, select hydrogen with a purity greater than or equal to 99.99% as the carrier gas, and set the working conditions of the TCD thermal conductivity detector of the gas chromatograph as follows: dry sound ≤ 0.02mv; drift ≤ 0.25mv / min , the temperature of column oven and injector is 80°C, the temperature of detector is 100°C, TCD attenuation×range: 1×0.05, the temperature of TCD hot wire is 180°C±10°C; the current of hot wire is: 100±2mA;

[0047] Use a syringe to inject H from the injection port of the chromatograph 2 S, SO 2 , N 2 Gas mixed standard sample gas 0.5mL to calib...

Embodiment 2

[0051] On April 6, 2009, when the operator was operating the 220 isolating switch, he heard an abnormal sound inside the equipment, suspected that there was an electrical fault, and extracted SF on-site from the electrical equipment of the 220kV substation. 6 The gas sample is 50mL; a stainless steel tube with a length of 2m and an inner diameter of 3mm filled with a 60-80 mesh GDX-301 stationary phase is selected as the chromatographic column.

[0052] Put the chromatographic column into the gas chromatograph, select hydrogen with a purity greater than or equal to 99.99% as the carrier gas, and set the working conditions of the TCD thermal conductivity detector of the gas chromatograph as follows: dry sound ≤ 0.02mv; drift ≤ 0.25mv / min , the temperature of column oven and injector is 80°C, the temperature of detector is 100°C, TCD attenuation×range: 1×0.05, the temperature of TCD hot wire is 180°C±10°C; the current of hot wire is: 100±2mA;

[0053] Use a syringe to inject H f...

Embodiment 3

[0057] On April 16, 2009, SF was extracted on-site in the electrical equipment of the 220kV substation 6 The gas sample is 50mL; a stainless steel tube with a length of 2m and an inner diameter of 3mm filled with a 60-80 mesh GDX-301 stationary phase is selected as the chromatographic column.

[0058] Put the chromatographic column into the gas chromatograph, select hydrogen with a purity greater than or equal to 99.99% as the carrier gas, and set the working conditions of the TCD thermal conductivity detector of the gas chromatograph as follows: dry sound ≤ 0.02mv; drift ≤ 0.25mv / min , the temperature of column oven and injector is 80°C, the temperature of detector is 100°C, TCD attenuation×range: 1×0.05, the temperature of TCD hot wire is 180°C±10°C; the current of hot wire is: 100±2mA;

[0059] Use a syringe to inject H from the injection port of the chromatograph 2 S, SO 2 , N 2 Gas mixed standard sample gas 0.5mL to calibrate the chromatograph;

[0060] After the chro...

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Abstract

The invention relates to a method for detecting internal fault of SF6 electrical equipment by using a gas chromatograph, comprising the following steps: a stainless steel tube filled with 60-80 meshes of GDX-301 stationary phase is firstly selected as a chromatographic column, then 50mL of SF6 gas sample is extracted from the SF6 electrical equipment in the field for later use; the chromatographic column is placed in the gas chromatograph, hydrogen is selected as carrier gas, and working conditions of a TCD (thermal conductivity detector) in the gas chromatograph is set; the chromatograph is demarcated; 0.5mL of gas sample is selected and the gas sample is injected into the chromatograph through an injection port of the chromatograph with the use of an injector, the computing mode of the chromatograph is selected, and then the gas sample is identified whether H2S or SO2 exists or not by the TCD after the gas sample is separated by the chromatograph and the contents of H2S and SO2 gases are automatically calculated; and the result is analyzed. The invention adopts gas-solid chromatography and has the advantages of good stability, less gas consumption, ready-for-detection and high accuracy, etc. The method is easy and feasible and has low detection cost. The invention provides simple and effective means for early detection of the internal fault of the SF6 electrical equipment and in-time elimination of hidden dangers.

Description

technical field [0001] The invention relates to a detection method for electrical equipment faults, in particular to a method for detecting SF by using a gas chromatograph 6 The method of internal failure of electrical equipment. Background technique [0002] At present, with the rapid development of the power grid, SF 6 Gas has become the only important dielectric for EHV and UHV electrical equipment. Its technology has been used for more than 20 years, but its inspection method is mainly to detect SF 6 The moisture in the gas is the main content, and the moisture content can only predict the insulation and arc extinguishing ability of the electrical equipment, but cannot predict whether there are hidden dangers inside the electrical equipment. In the society, sensors are used to detect the decomposition gas in the equipment, but the equipment needs to be powered off, connected to the equipment, and a certain equipment air pressure must be ensured to detect. This test met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/60G01N30/66G01R31/12
Inventor 王俊良段利伟钱泽文白慧芳王振方郑俊阳牛宇干
Owner PINGDINGSHAN POWER SUPPLY ELECTRIC POWER OF HENAN
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