The transformer overhaul and dealing with leakage need to choose better oil resistance sealing element. The transformer industry in china often use chemigum as sealing element. The oil resistance depends on the content of chemigum and acrylonitrile. The higher content of them, the better oil resistance they are. The hardness is high and is not easy out of shape.
ZF80 butterfly valve is the vacuum butterfly valve. Compare with common butterfly valve, the vacuum butterfly valve improved a lot in mechanical strength and surface finish. The biggest advantage is the kenck adopt double deck seal to avoid the oil leakage in kneck.
For the air holes and sand holes left by casting, electric welding can be used to plug the leakage. Before blocking welding should find out the leakage point, leakage point small can be directly used to seal the leakage point with electric welding, leakage point should be first filled with asbestos rope or metal filler, and then in the surrounding surfacing, and then use small welding rod large current fast arc welding.
This method is used for the small leakage and drip leakage of transformer. It can be used for the leakage points which are not suitable to be treated by electric welding.
