A preparation method and preparation device of dissolved gas in transformer oil
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A technology of transformer oil and dissolved gas, which is applied in the field of transformer oil and can solve problems such as vacancies
Active Publication Date: 2022-02-08
CHONGQING UNIV
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[0003] At present, the detection of gas in oil has gradually become a research hotspot, but the preparation and device for the concentration of dissolved gas in oil tested by the sensor in oil are still in vacancy. The past devices were mainly used for mixing and single gas concentration in the gas phase environment. Therefore, , how to realize the preparation of dissolved gas oil samples in oil and the design of the preparation device still need to seek a major breakthrough
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Embodiment 1
[0038] This embodiment 1 provides a preparation method for dissolved gas in transformer oil, which is to take two parts of the same transformer oil a and b, feed gas into transformer oil a to make the gas in a reach saturation, and then make the gas in a and b The temperature is the same, combined with the Ostwald coefficient derived from Henry's law to control the flow ratio of the oil in a and b, and finally prepare the transformer oil with a specified dissolved gas concentration.
[0039] As a further refinement, the Ostwald coefficient is dependent on temperature and its formula is:
[0040]
[0041] : actual temperature;
[0042] : Ostwald coefficient of oil at 273K;
[0043] : The density of oil at 288K;
[0044] calculated for temperature The Ostwald coefficient at , so the dissolved gas concentration in the final formulated oil:
[0045]
[0046]
[0047] : gas concentration in the oil (%);
[0048] : Actual flow rate of oil outlet hole in sa...
Embodiment 2
[0070] The purpose of Example 2 is to prepare transformer oils with dissolved gas concentrations in No. 10 transformer oil of 350 ppm, 480 ppm and 640 ppm under the condition of 80°C.
[0071] The specific operation process of this embodiment 2 is the same as that of embodiment 1.
[0072] The final calculation shows that when the dissolved gas concentrations in the transformer oil are 350ppm, 480ppm and 640ppm respectively, the flow control ratios in the oil-gas dissolution chamber and the transformer oil control greenhouse are respectively , and .
Embodiment 3
[0074] The purpose of Example 3 is to prepare transformer oils with dissolved gas concentrations of 50 ppm and 200 ppm in No. 25 and No. 45 transformer oils under the condition of 80° C., respectively.
[0075] The specific operation process of this embodiment 3 is the same as that of embodiment 1.
[0076] Finally, the flow control ratios in the oil-gas dissolution chamber and transformer oil control greenhouse of No. 25 transformer oil and No. 45 transformer oil are calculated as and .
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Abstract
The invention discloses a preparation method and a preparation device for dissolved gas in transformer oil. The method comprises the steps of taking two identical transformer oils a and b, feeding gas into transformer oil a to make the gas in a reach a saturated state, and then making The temperatures in a and b are the same, and the Ostwald coefficient derived from Henry's law is used to control the flow ratio of the oil in a and b, and finally prepare a transformer oil with a specified dissolved gas concentration. The preparation device includes an oil and gas dissolution chamber, a Transformer oil control greenhouse, test room and control equipment, oil and gas dissolving room, transformer oil control greenhouse and test room are respectively connected with control equipment. The preparation method of the dissolved gas in the transformer oil of the invention has good practicability, the operation method is controllable, the steps are simple, and the repeatability is strong. The preparation device of the present invention has a wide range of applications, and can be used as a preparation device for dissolving gas oil in various oils.
Description
technical field [0001] The invention relates to the technical field of transformer oil, in particular to a preparation method and a preparation device for dissolved gas in transformer oil. Background technique [0002] The monitoring of dissolved gas in transformer oil directly affects the accuracy of transformer fault diagnosis. The conventional analysis of dissolved gas in off-line oil in the laboratory is to regularly take oil samples on site and then analyze them on the laboratory chromatograph. The disadvantage is that the detection cycle is long , it is impossible to monitor the dissolved gas in the transformer oil in real time and effectively during the oil sampling cycle interval, and it is impossible to monitor the sudden failure of the transformer. The on-line monitoring system for dissolved gas in oil can realize continuous monitoring of transformer status, which is conducive to early detection of fault symptoms, especially effective in identifying sudden faults, ...
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