Three-phase oil-immersed transformer adopts fully oil-filled sealed corrugated oil tank shell to adapt to the expansion of oil by its own elasticity is permanently sealed oil tank, including 480v 3 phase transformer, 300 kva 3 phase transformer, 3 phase variable transformer and so on.
Transformer overhaul and deal with leakage, should choose high temperature resistance, good oil resistance seals. Domestic transformer industry most commonly used sealing material for nitrile rubber, its oil resistance mainly depends on the content of acrylonitrile in the nitrile rubber, acrylonitrile content, the higher, the better the oil resistance, the greater the hardness, the more difficult to deformation. In general, the Shore hardness of NBR should be selected between 70 and 80. Identify the oil resistance performance of the gasket, generally should do the gasket aging test and compatibility test with transformer oil, will be immersed in 120 ℃ hot oil 168h, and then measure its weight, volume and hardness of the rate of change, select the deformation is not in line with the standard seals.
Butterfly valve choose ZF80 type vacuum eccentric butterfly valve. Compared with ordinary butterfly valves, vacuum eccentric butterfly valve in mechanical strength, surface finish have been greatly improved, and the product has a great advantage, is the interface with the transformer flange using a double seal, so as to put an end to the transformer interface oil leakage problems. For the transformer due to casting left behind the air holes, trachoma, weld, weld joints appeared false welding, desoldering, cracks, can be used to plug the leakage of electric welding. Before plugging the welding should find the leakage point, the leakage point is small can be directly with the welding will leakage point dead; leakage point should be filled with asbestos rope or metal filler, and then around the pile welding, and then use a small electrode high-current rapid arc welding.
Prevent leakage, safety for you and me.