The oil-immersed transformer shell is a combination of steel plate welding and connection. Longer welds and more welded joints have higher requirements for welding operations.
The most commonly used sealing material in transformer industry is nitrile rubber. Its oil resistance mainly depends on the acrylonitrile content in the nitrile rubber.
If the oil leakage point is not obvious, but there is only a slight oil leakage phenomenon, you can use soap to temporarily repair the leakage. The method is to soak the soap with water, and then apply it back and forth on the oil leakage point several times. This method is only a temporary measure, wait for the opportunity to weld and repair the leak. But there is one thing to pay attention to. Before welding, the power must be cut off. After confirming that there is no power, the oil filling hole screw on the oil pillow should be opened to allow the air to circulate. Also prepare fire-fighting equipment such as sand and fire extinguishers, just in case.
