How to solve the problem of transformer leakage oil

[Students' Question] How to solve the transformer leakage problem?

[Solution] Solve the problem of transformer leakage oil

1, choose a good material seals

When transformers are inspected and treated for leakage, seals that are resistant to high temperatures and good oil resistance should be selected. The most commonly used sealing material in the domestic transformer industry is nitrile rubber. Its oil resistance performance mainly depends on the content of acrylonitrile in nitrile rubber. The higher the acrylonitrile content, the better the oil resistance, and the greater the hardness, the less likely to be deformed. In general, Nitrile rubber with Shore hardness between 70 and 80 should be selected. When evaluating the oil resistance of gaskets, seal aging test and compatibility test with transformer oil should generally be done. Soak it in hot oil at 120°C for 168 hours, and then measure the change rate of its weight, volume and hardness. Little deformation, in line with the standard seals.

2, choose a high quality butterfly valve

The butterfly valve chooses ZF80 type vacuum eccentric butterfly valve. Compared with ordinary butterfly valve, vacuum eccentric butterfly valve has great improvement in mechanical strength and surface finish. Moreover, this product has one of the biggest advantages, that is, it uses a double seal at the interface with the flange of the transformer. Leakage at the transformer interface.

3, the use of welding plugging

For the pores and sand holes left by the casting of the transformer, the welds, welds, welds, and cracks that appear in the weld 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 asbestos rope or metal packing should be filled first in the larger leakage point, and then surfacing in the surrounding area. Then the small welding rod is used. High current fast arc welding.

4, standard seal replacement process

For transformers of different types and capacities, whether flanged or threaded, the dust and rust on the connection surface must be removed before replacing the seals. After the seals are cleaned, apply sealant on both sides of the seals. (Generally, 609 polymer liquid sealant is used). After the sealant is dried for a period of time after the solvent evaporates, tighten the flange and screw.

5, improve the installation process, to prevent leakage due to improper installation methods

If the flange interface is uneven or deformed and the misalignment is corrected, if the misalignment can not be corrected, the flange can be cut off and rewelded. It must be ensured that the interface is parallel. When mounting, the compression of the gasket is about 1/3 of its thickness.

6, rapid sealing plugging glue stick plugging

This method is used for the small leakage and leakage of the transformer. The leakage of the transformer radiator is relatively thin, and the leakage point that is not suitable for the leakage plugging method can be blocked by this method. When plugging with a plugging glue stick, the oil, paint, and oxide in the plugged area must be completely removed to expose the metal. Then adjust the amount of plugging glue according to the ratio, and plug the leaked part until it does not leak.

The above contents are all based on the problems encountered by the trainees during their actual work. For reference, if any questions, please communicate and correct.