Leak detection method for metal corrugated oil conservator

Abstract

The invention relates to an oil immersion type electric device maintenance technology field, to be specific, relates to a leak detection method of a metal corrugated type oil conservator. Leak detection gas is injected in an oil chamber by the exhaust coupling pipe of the metal corrugated type oil conservator, and the flanges of the exhaust coupling pipe and a flange of a respirator coupling pipe are wrapped up, and a method of detecting the content of the leak detection gas in an inner cavity of a metal expander and the wrapping parts of the flanges in a quantitative way is adopted to find leak detection points. The leak detection points of the metal expander, the flanges, a valve, and other parts, which air possibly enters, are searched by adopting the method of detecting the content of the leak detection gas in the inner cavity of the metal expander and the wrapping parts of the flanges in a quantitative way, and therefore the leak detection sensitivity and the leak detection efficiency of the metal corrugated type oil conservator are effectively improved, and the power-off maintenance time of the oil immersion type electric device is shortened.

Description

technical field [0001] The invention relates to the technical field of maintenance of oil-immersed electrical equipment, in particular to a leak detection method for a metal corrugated oil conservator. Background technique [0002] Transformers and reactors are key primary electrical equipment in the power grid. At present, most of the high-voltage transformers and reactors in the power system are oil-immersed electrical equipment, which have high requirements for the quality of insulating oil used as insulation and cooling medium. Metal corrugated oil conservator is a kind of sealed oil conservator commonly used in oil-immersed electrical equipment in power system. It mainly plays the role of volume compensation and air isolation. When there is a defect in the sealing structure of the oil conservator, the air and moisture in the external environment can easily invade the interior of the equipment, accelerating the aging of the insulating oil inside the electrical equipment...

AI Technical Summary

Problems solved by technology

When there is a defect in the sealing structure of the oil conservator, the air and moisture in the external environment can easily invade the interior of the equipment, accelerating the aging of the insulating oil inside the electrical equipment, and there are local temperature and pressure fluctuations that cause bubbles to precipitate and gather, resulting in Local dielectric strength reduces the possibility of electrical discharges

[0003] At present, the leakage inspection of oil-immersed electrical equipment is generally to simply observe whether there is oil leakage on the outside, and this method is only effective for leakage parts below the oil surface of the equipment

For the leakage inspection of parts above the oil surface of the equipment, such as the oil conservator, the existing technical means are limited to the relay monitoring method and the inflation and pressure maintenance detection method.

The relay monitoring method can monitor the vacuum state inside the oil conservator in real time, and send an alarm signal when a gas leak occurs, but this method cannot confirm the specific location of the gas leak

The air-filled and pressure-holding detection method judges whether there is a leak by observing the gas pressure change inside the oil conservator for a long time. This method has low precision, takes a long time, and is easily affected by changes in ambient temperature. When there are multiple possible leak points, it is difficult to judge the leak point. s position

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