How to prevent the transformer high and low pressure side leakage oil?

First, choose raw materials outstanding seals

When repairing and disposing of a transformer, leakage should be selected with excellent seals that are resistant to high temperatures and oil. The most commonly used sealing material for transformer occupation in China is rubber. Its oil resistance performance depends on the content of acrylonitrile in rubber. The higher the acrylonitrile content, the better the oil resistance, and the greater the hardness, the less likely it is to deform. Normal conditions should be selected between 70 and 80 Shore D hardness. When determining the oil resistance of gaskets, seal aging tests and compatibility tests with transformer oils should normally be performed. Soak them in hot oil at 120°C for 168 hours, then measure the change rate of its component, volume, and hardness, and select them. Little distortion, in line with standard seals.

Second, select the high quality butterfly valve

Butterfly valve selected ZF80 vacuum pain butterfly valve. Compared with the common butterfly valve, the vacuum painful butterfly valve has great progress in mechanical strength and surface finish, and the product has one of the greatest strengths, that is, the use of a double seal at the interface with the flange of the transformer. Oil leakage at the transformer interface was questioned.

Third, the use of welding plugging

As for the pores and blisters left by the casting of the transformer, the welds, welds, welds, and cracks that are present in the welds can be plugged with electric welding.

The leakage point should be found before plugging, and the leakage point can be directly destroyed by welding if the leakage point is smaller. The larger leakage point should be filled with asbestos rope or metal packing first, then surfacing welding in the vicinity, and then using a small welding rod High current speed arc welding.

Fourth, the standard seal replacement technology

With regard to transformers of different types and sizes, whether it is the flange connection or the threaded connection, it is necessary to remove the dust and rust on the interface before replacing the seal. After the seal is cleaned and cleaned, double seals are used. Surface coated with sealant (usually selected 609 polymer liquid sealant), to be dry for a period of time after the sealant solvent evaporation, the flange, screw fastening.
 

V. Progressive device technology level, rooted in leaks caused by improper installation methods

In the case of a flanged interface that is not flat or deformed and misaligned, it must be cut and rewelded. It is necessary to ensure that the interface is parallel. When the device is used, the amount of shrinkage of the gasket is preferably about 1/3 of its thickness.

Sixth, rapid sealing plugging glue stick plugging

This method is used for small leakage and leakage of transformers. The seepage points of transformer radiators with thin wall and leakage plugging methods that are not suitable for use in electric welding can be used to stop leakage. When plugging with a plugging glue stick, it is necessary to thoroughly eradicate oil, paint, and oxide in the plugged area to expose the metal. Then adjust the amount of plugging glue according to the ratio, and plug the leaked part until it stops leaking.