Gas-dissolved-in-vegetable-insulating-oil analyzer with oil-gas separation function and detecting method

Abstract

The invention discloses a gas-dissolved-in-vegetable-insulating-oil analyzer with an oil-gas separation function and a detecting method. The gas-dissolved-in-vegetable-insulating-oil analyzer with the oil-gas separation function and the detecting method are characterized in that helium serves as carrier gas, and the vacuum degassing and minitype thermal conductance chromatographic instrument combined technology is utilized for analyzing hydrogen, oxygen, nitrogen, carbon monoxide, carbon dioxide, methane, ethylene, ethane, dimethylmethane and acetylene in vegetable insulating oil. A four-chromatographic-column analysis system is adopted, a valve is utilized for column switching, gas pump circulating gas is adopted for sample introduction, all samples enter a chromatographic column A at a time, meanwhile, a chromatographic column B and a chromatographic column D are connected to the tail end of the chromatographic column A in series, and after hydrogen, oxygen, nitrogen, methane and carbon monoxide are exhausted, the original state of a ten-way valve is switched. Carbon dioxide, ethylene, acetylene, ethane and dimethylmethane firstly generate peaks on a channel A of a thermal conductivity detector, and hydrogen, oxygen, nitrogen, carbon monoxide and methane generate peaks on a channel B of the thermal conductivity detector. The instrument is high in sensitivity to the gas and suitable for being applied and popularized in smart power grids.

Description

[0001] 1. Technical field [0002] The invention belongs to the technical field of power grids, and relates to a gas-dissolved gas analyzer in vegetable insulating oil with an oil-gas separation function and a detection method, which are mainly used in the analysis of dissolved gas in vegetable insulating oil of oil-filled electrical equipment. [0003] 2. Background technology [0004] At present, mineral oil is generally used as insulating oil for oil-filled electrical equipment inside substations and power plants. Mineral insulating oil is a non-renewable resource with a low natural degradation rate, which will pollute the environment, and has a low ignition point and poor fire resistance. Vegetable insulating oil is an environmentally friendly and renewable liquid insulating medium. Its ignition point is higher than 300°C, and it is not easy to cause fire. The natural degradation rate reaches more than 90%, and it will not cause environmental pollution after leakage. In the...

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Problems solved by technology

At the same time, the Ostwald coefficients of vegetable insulating oil and mineral insulating oil are also quite different. If the traditional mechanical oscillation method is directly used for the analysis of dissolved gases in vegetable insulating oil, it will lead to large errors.

[0006] In recent years, Chongqing University in China has carried out some theoretical and experimental research on the preparation, physical and chemical properties and electrical properties of vegetable insulating oil, but there is little content related to the analysis of dissolved gases in vegetable insulating oil.

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