A hydrogen sensor for on-line monitoring of hydrogen concentration in an oil-immersed transformer and its application method

Abstract

A hydrogen gas sensor (1) for online monitoring of the hydrogen gas concentration in an oil-immersed transformer and a method for using same. The sensor (1) comprises a hydrogen gas sensitive probe (2), the hydrogen gas sensitive probe (2) comprises a hydrogen gas sensitive chip (5) in direct contact with transformer oil (16), the hydrogen gas sensitive chip (5) comprises a substrate, an electrical insulating layer arranged on the substrate and a hydrogen gas sensitive element arranged on the electrical insulating layer, and a hydrogen gas specificity coating for inhibiting the diffusion of gas molecules other than hydrogen gas is arranged on the surface of the hydrogen gas sensitive element. The sensor (1) can be in direct contact with the transformer oil (16), so that an oil-gas separation device is avoided, the reliability of the sensor (1) is improved, and the maintenance cost is lowered; and on the other hand, use of the hydrogen gas specificity coating eliminates cross responses of the sensor (1) to fault gases such as CO, C2H2 and C2H4, and the hydrogen gas concentration and the rate of change thereof in the transformer oil (16) can be monitored in a continuous and reliable way, and a dependable basis for learning the operating condition of the transformer (15) accurately is offered.

Description

technical field [0001] The invention belongs to the technical field of on-line monitoring of oil-immersed transformers, in particular to a hydrogen sensor for on-line monitoring of hydrogen concentration in oil-immersed transformers and a method for using the same. Background technique [0002] Transformer failure is the main cause of power plants, substation outages and local power grid accidents. Reducing transformer failure means improving the economic benefits of the power grid and ensuring national economic security and social stability. Therefore, transformer online monitoring is an important part of the power equipment online monitoring system. [0003] On-line monitoring of the dissolved concentration of fault gases in oil-immersed transformers is an important part of the transformer on-line monitoring system. The monitoring of transformer oil fault gas routinely adopts periodic sampling in the laboratory, and uses gas chromatography to detect the fault gas dissolve...

AI Technical Summary

Problems solved by technology

However, there are several problems in this patent. On the one hand, the use of pure palladium as the hydrogen sensitive material is unstable, especially when the hydrogen bias is high, there is an irreversible hydrogen embrittlement process, which causes the palladium film to fall off; on the other hand, CO Such as transformer fault gas is very easy to produce competitive adsorption on the surface of the palladium film, occupying the adsorption position of hydrogen molecules, resulting in a decrease in the sensitivity of the sensor to hydrogen and a slow response rate

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