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Gas sensor for monitoring gas content in insulating oil

A gas sensor, gas content technology, applied in measuring devices, instruments, scientific instruments, etc., to achieve the effect of improving cross-sensitivity

Inactive Publication Date: 2009-02-11
ASENSOR TECH
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Problems solved by technology

[0018] Aiming at the defects existing in the existing acetylene gas sensor, the present invention provides an integrated miniature fuel cell type acetylene gas sensor with good reliability, high selectivity, and long-term continuous online monitoring of acetylene gas in the insulating oil of high-voltage electrical equipment

Method used

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  • Gas sensor for monitoring gas content in insulating oil
  • Gas sensor for monitoring gas content in insulating oil

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Embodiment 2

[0078] An electrocatalytic filter layer (Rh:Ru=20:80, wherein the load of Rh is 0.2 mg / cm 2 ), so that the gas passes through the electrocatalytic filter layer before diffusing to the anode, and the response to acetylene and other gases is tested under the same conditions as in Example 1, and the results are shown in Table 5.

[0079] table 5

[0080]

[0081] It can be seen that when the electrocatalytic filter layer is included, the sensor has extremely high accuracy in detecting acetylene, and the sum of the cross-sensitivity of the electrodes to other interfering gases is less than 1%, which can fully realize the selective detection in the environment of high interfering gases Detection of trace amounts of acetylene.

[0082] 8. Efficiency of electrocatalytic filter layer

[0083] From the comparative results of Example 1 and Example 2, it can be seen that the filtering effect of the electrocatalytic filter layer on H2 reaches 90%, and the filtering effect on CO reach...

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Abstract

The invention relates to a gas sensor for monitoring the gas content in insulating oil, in particular to a gas sensor for the online monitoring of the acetylene gas content in insulating oil. The gas sensor comprises a hollow-structure integrated casing, and combined type oil-gas separation membrane and a fuel cell type gas sensing component which are installed inside the casing; wherein a selective electrocatalysis filtering layer for filtering interfering gas is also installed between the combined type oil-gas separation membrane and the fuel cell. Identical gas diffusion electrodes formed by gold alloy (Au) clectrocatalyst are adopted for the anode and the cathode of the selective acetylene fuel cell. The activity of the selective electrocatalysis filtering layer to the interfering gas is higher than the fuel cell itself to the interfering gas; with the increasing of the activity ratio, the filtering effect is also improved. The gas sensor is resistant to various ambient pressure and temperature changes, and the content of low concentration acetylene gas can be correctly and stably monitored in the environment with high concentration interfering gas such as hydrogen gas, carbon monoxide and ethylene gas.

Description

technical field [0001] The invention relates to an oil-immersed high-voltage electrical equipment failure on-line monitoring technology, in particular to a micro-integrated selective fuel cell type acetylene gas sensor for on-line continuous monitoring of the acetylene gas concentration in insulating oil. Background technique [0002] In the maintenance (procedure) plan of high-voltage electrical equipment such as transformers, reactors, and transformers in power systems, the analysis results of dissolved gases in oil are widely used as the main indicators for judging internal faults. Among them, the acetylene gas content is an important basis for judging whether there is a high-energy discharge inside the transformer. Even small amounts of acetylene indicate serious potential for failure of oil-filled electrical equipment. Therefore, accurate and timely detection of the concentration of dissolved acetylene gas in oil is of great significance for the reliable and safe opera...

Claims

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Application Information

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IPC IPC(8): G01N27/407G01N27/30B01D71/32
Inventor 秦仁炎赵莉
Owner ASENSOR TECH
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