Today, I will share the troubleshooting methods of power transformers
1. Oil leakage from welding
The main reason is that the welding quality is poor, there are virtual welding, desoldering, pinholes, sand holes and other defects in the welding seam. The power transformer is covered with flux and paint when it leaves the factory, and the hidden dangers will be exposed after operation. In addition, the electromagnetic vibration will make the welding Vibration cracks, causing leakage. For leaks that have already occurred, first find out the leak point, which cannot be missed. For parts with severe leakage, metal tools such as flat shovels or pointed punches can be used to rivet the leakage point. After controlling the amount of leakage, the treatment surface is cleaned. Most of them are cured with polymer composite materials, and long-term treatment can be achieved after curing. purpose of leakage.
2. Oil leakage from seals
The cause of poor sealing is that the seal between the box edge and the box cover is usually sealed with an oil-resistant rubber rod or rubber pad. If the joints are not handled properly, oil leakage will occur. Some are tied with plastic straps, and some directly press the two ends together. Due to the rolling during installation, the interface cannot be pressed firmly, the sealing effect cannot be achieved, and oil still leaks. Fushilan material can be used for bonding, so that the joints form a whole, and the oil leakage phenomenon is greatly controlled; 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 surface of the flange is uneven, the fastening bolts are loose, and the installation process is not correct, so that the bolts are not fastened well, resulting in oil leakage. After tightening the loose bolts first, seal the flanges, and also treat the bolts that may leak, so as to achieve the purpose of complete treatment. To fasten the loose bolts, it must be operated strictly according to the operation process.
4. Oil leakage from bolt or pipe thread
When leaving the factory, the processing is rough and the seal is poor. After a period of time, the power transformer will leak oil. The bolts are sealed with polymer materials to achieve the purpose of controlling leakage. Another method is to unscrew the bolt (nut), apply Fushilan release agent on the surface, and then apply the material on the surface to fasten it. After curing, the purpose of treatment 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. For crack leaks, drilling stop holes is the best way to relieve stress and avoid extension. According to the condition of the crack, lead wire can be driven into the leak point or riveted to death with a hand hammer during treatment. Then clean the leak with acetone and seal it with material. Casting sand holes can be directly sealed with material.
6. Radiator oil leakage
The heat dissipation pipe of the radiator is usually made of flattened steel pipe with seams and then stamped. Oil leakage often occurs in the bending part and welding part of the heat dissipation pipe. This is because when the heat dissipation pipe is stamped, the outer wall of the pipe is under tension and the inner wall is under pressure. , due to the presence of residual stress. Close the upper and lower plate valves (butterfly valves) of the radiator to isolate the oil in the radiator from the oil in the box to reduce pressure and leakage. After determining the leakage site, carry out appropriate surface treatment, and then use Fushilan material for sealing treatment.
7. Porcelain bottle and glass oil mark leaking oil
Usually caused by improper installation or seal failure. Polymer composite materials can bond metal, ceramics, glass and other materials very well, so as to achieve the fundamental treatment of oil leakage.