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Fault Analysis And Solution Of Power Transformer



1. Welding leakage

Is there bad welding quality, weld, sealing off, pinhole in the weld defects such as trachoma, electric power transformer factory for welding and covered with paint, after running the problems will be exposed, in addition to the electromagnetic vibration will make the welding crack, causing leakage. For leakage phenomenon, first of all to find leakage point, can not be omitted. In view of the serious leakage of parts can be riveted by leakage flat shovel or tip punch and other metal tools, control leakage after treatment cleaning the surface, the current use of polymer composite materials for curing, curing can be achieved after long-term treatment to leakage.

2. Sealing oil leakage

Because of the bad sealing, the seal of the box and the cover is sealed with oil resistant rubber stick or rubber gasket. If the joint is not handled properly, it will cause oil leakage fault. Some with plastic banding, and some directly to the two end pressure together, due to the installation of rolling, the interface can not be pressed, can not get the sealing effect, is still leaking oil. The adhesive can be used to make the joint to form a whole, and the leakage phenomenon is greatly controlled; if the operation is convenient, the metal shell can be bonded simultaneously, so as to achieve the purpose of leakage treatment.

3. Oil leakage at flange joint

The flange surface is uneven, the fastening bolt is loose, the installation craft is not correct, causes the bolt to fasten not good, causes the seepage oil. After the loose bolts are tightened, the flange is sealed, and the bolt which may leak is also processed to achieve the goal of complete control. Fastening the loosened bolts must be operated strictly according to the operation process.

4, bolt or pipe thread leakage oil

Rough processing, poor sealing, power transformer seal for a period of time after the leakage of oil will produce fault. The bolt is sealed by macromolecule material, so as to achieve the purpose of leakage control. Another way is to screw out the bolt (nut), the surface of the painted blue mold release agent, and then coated on the surface of the material after fastening, curing can achieve the purpose of governance.

5. Leakage of iron castings

The main reason of oil leakage is caused by sand holes and cracks of cast iron. For crack leakage, drilling hole is the best way to eliminate stress and avoid elongation. Governance according to crack, on the leak into the wire or hammer riveting die. Then, the leakage point is cleaned with acetone and sealed with material. You can directly use the sand casting material to seal.

6, radiator leakage

Radiator tube is usually used after flattening tube with punched pipe bending part and the welding part often produces oil leakage in the heat, this is because the stamping heat pipe, the outer wall of the pipe under tension, the wall stress, residual stress caused by. The upper and lower flat valve (butterfly valve) of the radiator is closed, so that the oil in the radiator is separated from the oil in the tank, and the pressure and leakage are reduced. The appropriate surface treatment should be carried out after determining the leakage position, and then the sealing treatment should be carried out with the fortune blue material.

7, porcelain and glass oil standard oil leakage

Usually due to improper installation or seal failure. Polymer composite material can bond metal, ceramic, glass and other materials well, so as to achieve the fundamental treatment of leakage oil.


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