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

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...

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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

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