How to solve faults in power transformers

1. Oil leakage at the welding point

Mainly due to poor welding quality, including virtual welding, desoldering, pinholes, sand holes and other defects in the weld seam. When the power transformer leaves the factory, it is covered with welding flux and paint, which exposes hidden dangers after operation. In addition, electromagnetic vibration can cause welding cracking and leakage. For those that have already experienced leakage, first identify the leakage point and do not miss it. For areas with severe leakage, metal tools such as flat shovels or pointed punches can be used to rivet the leakage point, control the leakage amount, and clean the treated surface. Most of them use polymer composite materials for curing, which can achieve long-term treatment of leakage after curing.

2. Seal leakage

The reason for poor sealing is that the seal between the box edge and the box cover is usually sealed with oil resistant rubber rods or rubber pads. If the joint is not handled properly, it may cause oil leakage failure. Some are tied with plastic tape, while others directly press the two ends together. Due to rolling during installation, the interface cannot be firmly pressed and does not provide a sealing effect, resulting in oil leakage. Fushilan material can be used for bonding to form a cohesive joint, greatly controlling oil leakage; If the operation is convenient, the metal shell can also be bonded at the same time to achieve the purpose of leakage control.

3. Oil leakage at the flange connection

The flange surface is uneven, the fastening bolts are loose, and the installation process is incorrect, resulting in poor bolt tightening and oil leakage. First tighten the loose bolts, then seal the flange and address any potential leaks in the bolts to achieve complete remediation. Tightening loose bolts must be strictly carried out according to the operating process.

4. Oil leakage from bolt or pipe threads

When leaving the factory, the processing is rough and the sealing is poor. After a period of sealing, the power transformer will experience oil leakage faults. Using polymer materials to seal bolts for the purpose of controlling leakage. Another method is to unscrew the bolt (nut), apply Fushilan release agent on the surface, and then tighten it after applying the material on the surface. After curing, the treatment goal can be achieved.

5. Oil leakage from cast iron parts

The main reason for oil leakage is due to sand holes and cracks in cast iron parts. Drilling anti crack holes is the best method to eliminate stress and avoid extension for crack leakage. During treatment, lead wire can be inserted into the leak point or riveted with a hammer according to the condition of the crack. Then clean the leakage point with acetone and seal it with material. Casting sand holes can be directly sealed with materials.

6. Oil leakage from radiator

The heat dissipation pipes of a radiator are usually flattened with slotted steel pipes and stamped to produce oil leakage in the bent and welded parts of the pipes. This is because when stamping the heat dissipation pipes, the outer wall of the pipe is under tension and the inner wall is under pressure, resulting in residual stress. Close the upper and lower flat valves (butterfly valves) of the radiator to isolate the oil in the radiator from the oil in the box, reducing pressure and leakage. After determining the leakage location, appropriate surface treatment should be carried out, and then seal treatment should be carried out using Fukushi Blue material.

7. Leakage of oil from porcelain bottles and glass oil labels

Usually caused by improper installation or seal failure. Polymer composite materials can effectively bond materials such as metals, ceramics, and glass, thereby achieving fundamental treatment of oil leakage.