Fault analysis of oil-immersed transformer

The oil-immersed transformer has the advantages of good insulation performance, good thermal conductivity, and low price of transformer oil. However, sometimes the oil-immersed transformer will fail. Then let us carry out the fault analysis of the oil-immersed transformer together.

This is the content list:

l Oil-immersed transformer oil leakage at the weld

l The oil-immersed transformer is not well sealed

l Oil-immersed transformer oil leakage at the flange connection

Oil-immersed transformer oil leakage at the weld

The main reason is that the welding quality of the oil-immersed transformer is poor. The oil-immersed transformer has defects such as false welding, desoldering, pinholes, and blisters in the weld. It is covered with welding flux and paint when it leaves the factory, and hidden dangers are exposed after the operation. In addition, electromagnetic vibration will cause welding to crack and cause leakage. For oil-immersed transformers that have leaked, first, find out the leaking point, and you shouldn’t miss it. For serious leakage of the transformer, metal tools such as a flat shovel or sharp punch can be used to rivet the leakage point. After controlling the leakage of the oil-immersed transformer, the treatment surface will be cleaned up, and polymer composite materials are usually used for curing and curing. After that, the purpose of long-term leakage control can be achieved.

The oil-immersed transformer is not well sealed

The oil-immersed transformer is not well sealed. Usually, the seal between the tank edge and the tank cover is sealed with oil-resistant rubber rods or rubber gaskets. If the oil-immersed transformer joints are not handled properly, it will cause oil leakage failure. Some transformers are bound with plastic straps, and some transformers directly press the two ends together. Due to the rolling during installation, the oil-immersed transformer interface cannot be pressed firmly and cannot be sealed, and it is still leaking oil. The material can be used for bonding to make the oil-immersed transformer joint form a whole, and the oil leakage phenomenon can be greatly controlled. If the operation is convenient, the metal shell of the oil-immersed transformer can also be bonded at the same time to achieve the purpose of leakage control.

Oil-immersed transformer oil leakage at the flange connection

The flange surface of the oil-immersed transformer is uneven, the fastening bolts are loose, and the installation process of the transformer is incorrect, which makes the bolts not fastened properly and causes oil leakage. After tightening the loose oil-immersed transformer bolts, the flange of the transformer is sealed, and the bolts that may leak are also dealt with to achieve the purpose of complete treatment. To tighten the loose oil-immersed transformer bolts, you must strictly follow the oil-immersed transformer operating process.

Zhejiang Shuntong Electric Co., Ltd. is a professional manufacturing enterprise integrating development, production, sales, and service. The company was established in 2009 and is located in Liushi Town, "China's Power Capital", specializing in the production of various high and low voltage equipment. The above is the relevant content about the failure analysis of oil-immersed transformer. If you are interested in an oil-immersed transformer, you can contact us. Our website is www.sntoom.com.