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Variable-diameter piston type on-site testing device and method for gas content of transformer oil

A technology of variable-diameter pistons and transformer oil, which is applied to instruments and analytical materials, can solve the problems of reduced concentration of gas phase gas components, difficulty in accurately controlling the flow rate, and undetectable gas, so as to reduce the degree of vacuum, simplify the calculation of results, and avoid effect of error

Pending Publication Date: 2021-07-23
ELECTRIC POWER RES INST OF STATE GRID ANHUI ELECTRIC POWER +2
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Problems solved by technology

However, the problem with this method of carbon dioxide elution is that CO 2 The flow rate is not easy to control precisely, and the potassium hydroxide solution is 2 The absorption efficiency and the determination of the blank value need to be carefully studied. More importantly, this method is only suitable for the determination of the gas content of new oil. 2 The gas cannot be detected, making the measurement result low
In order to improve the degassing efficiency of oil with low gas content, it is generally used to increase the vacuum volume, that is, to increase the volume of the degassing container. Although the degassing efficiency is improved, the concentration of gas components in the gas phase is reduced, and the corresponding vacuum The differential pressure change of the gauge is reduced, which has higher requirements for the precision of the device

Method used

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  • Variable-diameter piston type on-site testing device and method for gas content of transformer oil
  • Variable-diameter piston type on-site testing device and method for gas content of transformer oil
  • Variable-diameter piston type on-site testing device and method for gas content of transformer oil

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Embodiment 1

[0046] 1. Device structure and connection relationship

[0047] Such as figure 1 As shown, a variable-diameter piston-type transformer oil field test device for gas content includes: a quantitative chamber 1, a variable-diameter piston 2, a vacuum measuring device 3, a first humidity sensor 4, a second humidity sensor 5, a heating and insulating shell 6, a temperature Sensor 7 , waste oil collecting device 8 , first valve 9 , second valve 10 , third valve 11 , fourth valve 12 , fifth valve 13 .

[0048] Such as Figure 2a-2c As shown, the variable diameter piston 2 includes: a variable diameter piston rod 20, a variable diameter piston sleeve 21, and the variable diameter piston rod 20 includes an upper column 22 and a lower column 23; the upper column 22 and the lower column 23 are coaxial connection, the radius r of the upper column 22 is smaller than the radius R of the lower column 23, and the length of the upper column 22 is equal to the length of the lower column 23; ...

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Abstract

The invention discloses a variable-diameter piston type on-site testing device and method for the gas content of transformer oil, belongs to the technical field of electric power system detection, and solves the problem of how to improve the detection precision by improving the concentration of gas in a gas phase on the premise that the precision of a vacuum measuring device is not changed. A variable-diameter piston is used as a degassing device, an oil phase and a gas phase are separated after degassing, then the removed gas is concentrated through resetting of a piston, so that the concentration of the gas in the final gas phase is improved, the removed gas is gathered by adopting a mode of reducing the vacuum volume after degassing, and the vacuum degree of the gas phase during final measurement is reduced. The requirement for high precision of the vacuum measuring device is lowered, and the measuring precision of the device is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of power system detection, and relates to an on-site testing device and method for gas content in oil of a variable-diameter piston type transformer. Background technique [0002] As an insulating medium with excellent performance, transformer oil is widely used in electrical equipment, and the performance of transformer oil insulation and arc extinguishing is affected by its own indicators. Gas content is an important quality index of transformer oil, which is mainly used to reflect the total amount of gas dissolved in transformer oil, including nitrogen, oxygen, carbon dioxide, carbon monoxide, hydrogen and some gaseous hydrocarbons. Dissolved gas may precipitate out of the oil to form bubbles when the temperature and pressure change. The insulation strength of the bubbles is lower than that of the transformer oil, forming a weak insulation area in the transformer oil, resulting in insulation breakdown and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N7/00
CPCG01N7/00
Inventor 刘子恩袁小芳魏存金祁炯宋玉梅徐霄筱董王朝潘大鹏卢小龙郭佩
Owner ELECTRIC POWER RES INST OF STATE GRID ANHUI ELECTRIC POWER
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