Common faults and solutions of transformers


The service life of a general power transformer is 15-2 […]

The service life of a general power transformer is 15-20 years. However, due to human or environmental factors, some common faults may occur during the use of the transformer. How to solve these faults? The following are the causes and solutions of common faults in transformers:
1. Oil leakage at the weld
Mainly due to poor welding quality, false welding, desoldering, pinholes, blisters and other defects in the weld. The power transformer is covered with flux and paint when it leaves the factory, and hidden dangers are exposed after operation. In addition, electromagnetic vibration will cause welding. Vibrate and crack, causing leakage. For leaks that have already occurred, first find out the leaking point and not leave it out. For severe leakage, metal tools such as flat shovel or sharp punch can be used to rivet the leakage point. After the amount of leakage is controlled, the treatment surface will be cleaned. Most of the polymer composite materials are used for curing, and long-term treatment can be achieved after curing. The purpose of the leak.

2. Oil leakage from the seal
The reason for poor sealing is that the seal between the tank edge and the tank cover is usually sealed by oil-resistant rubber rods or rubber gaskets. If the joints are not handled properly, it will cause oil leakage failure. 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, and the sealing effect is not achieved, and it is still leaking oil. It can be glued with Fuschlan material to form a whole joint, and the oil leakage phenomenon can be greatly controlled; if the operation is convenient, the metal shell can also be glued at the same time to achieve the purpose of leakage control.
3. Oil leakage at the flange connection
The flange surface is not flat, the fastening bolts are loose, and the installation process is not correct, so that the bolts are not fastened properly, which causes oil leakage. After tightening the loose bolts, the flange is sealed, and the bolts that may leak are also dealt with to achieve the purpose of complete treatment. The loose bolts must be tightened in strict accordance with the operating process.
4. Oil leakage from bolts or pipe threads
The factory has rough processing and poor sealing. 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 bolts (nuts), apply Faucet Blue release agent on the surface, and then apply the material on the surface to tighten it. After curing, the treatment can be achieved.
5. Oil leakage from cast iron parts
The main cause of oil leakage is blisters and cracks in the iron castings. Aiming at crack leakage, drilling crack arrest holes is the best way to eliminate stress and avoid extension. According to the crack situation, lead wire can be inserted into the leaking point or riveted with a hand hammer. Then use acetone to clean the leak point and seal it with material. Casting sand holes can be directly sealed with materials.
6. Oil leakage from the radiator
The heat pipe of the radiator is usually flattened with seam steel pipes and then made by stamping. Oil leakage often occurs in the bent and welded parts of the heat pipe. This is because when the heat pipe is stamped, the outer wall of the pipe is under tension and the inner wall is under pressure. , Caused by 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 tank and reduce the pressure and leakage. After confirming the leaking part, carry out proper surface treatment, and then use Fu Shilan material for sealing treatment.
7. Leaking oil from porcelain bottles and glass oil labels
It is usually caused by improper installation or seal failure. Polymer composite materials can bond metals, ceramics, glass and other materials well, so as to achieve the fundamental treatment of oil leakage.

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