Device for online monitoring of dielectric strength of insulating oil of high-voltage oil-filling power equipment

Abstract

The invention discloses a device for online monitoring of dielectric strength of insulating oil of high-voltage oil-filling power equipment. The device comprises a high-voltage direct-current pulse generation device, a testing unit, a voltage-withstanding testing probe, a cleaner and a measurement and control unit, wherein the high-voltage direct-current pulse generation device is used for generating monopole voltage pulse signals, the testing unit comprises a liquid reducing valve and a sealing structure and is used for acquiring the insulating oil to be tested, the voltage-withstanding testing probe as a testing device is arranged in the testing unit and is electrically connected with the high-voltage direct-current pulse generation device, a probe head portion of the voltage-withstanding testing probe is provided with an electrode for generating voltage among insulating clearances of the insulating oil to be tested, the cleaner is connected with the testing unit and used for cleaning the sealing structure and the voltage-withstanding testing probe, and the measurement and control unit is connected with the high-voltage direct-current pulse generation device, the testing unit, the voltage-withstanding testing probe and the cleaner. The device has the advantage that a nondestructive breakdown method based on a high-voltage pulse voltage technology is used for measuring the dielectric strength of the insulating oil of the high-voltage oil-filling power equipment, so that the voltage-withstanding performance of the insulating oil is reflected.

Description

technical field [0001] The invention relates to the technical field of gas detection, in particular to an on-line monitoring device for the dielectric strength of insulating oil of electric high-voltage oil-filled equipment. Background technique [0002] In recent years, with the rapid development of my country's electric power industry and the improvement of technical equipment, the management mode of the power grid is undergoing qualitative changes. The concepts of equipment condition maintenance and unattended substations have enabled us to have a more efficient, safer and more Economic grid operation mode. In recent years, there have been many accidents caused by internal faults of transformers, among which overheating and winding partial discharge faults account for about 70%, which are the biggest factors affecting the safe operation of transformers. At present, the most commonly used detection method is to analyze the gas content in oil. The conventional gas analysis ...

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Problems solved by technology

At present, the most commonly used detection method is to analyze the gas content in oil. The conventional gas analysis in oil is offline detection, and the sampling period is generally 3 months to 1 year. Partial discharge faults between layers and surrounding screens are difficult to monitor in time

Another method is to use gas chromatography to analyze the various gas contents of dissolved gas in oil, which has been widely used in recent years and has become a new development trend. This method can detect equipment in real time for a long time, so that Improve work efficiency and improve economic benefits; however, this method still has the problems of many types of detected gases, insufficient analysis accuracy, complex comprehensive diagnostic methods, and diagnostic results that cannot directly and effectively reflect the quality of the insulating medium

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