Cause 1: Welding quality. Oil-immersed transformer housings consist of welded and joined steel plates. Due to the long welding seam and more welding joints, the welding process requires higher requirements. Affected by the external environment,temperature, technology, welding materials, steel plate and other factors, sometimes the welding quality is not good,resulting in weld cracks and sand holes and other phenomena, which is one of the main reasons for oil leakage of oil-immersedtransformers.

　　Reason 2: sealing quality. The selection of transformer sealing type and sealing material is the main reason for poor sealing quality. When the sealing quality of the transformer is insufficient, oil leakage may occur during use.

　　Reason 3: seal aging. Affected by weather, environment, oil corrosion and other factors, the seal aging of oil-immersed transformers is also one of the main reasons for oil leakage from oil-immersed transformers. In addition, other reasons including lack of routine maintenance during use and failure to deal with minor problems found in a timely manner may also lead to oil leakage of oil-immersed transformers.

　　Oil-immersed transformer operating temperature regulations

　　For the use of oil-immersed transformers, what are the regulations on transformer operating temperature? What issues should be noted in the daily operation and maintenance of the transformer? To ensure stable operation of the transformer,

　　the following rules apply to the operating temperature of oil-immersed transformers:

　　Check whether the humming sound of the transformer is normal during operation.

　　Regularly check that the oil in the oil-immersed transformer is normal transparent yellow color and that the level is within the normal range.

　　Periodically check whether the current in the oil-immersed transformer is within the normal range.

　　Periodically check the wires, connectors and cables of the oil-immersed transformer for overheating.

　　Check that there are no discharge marks on the transformer cover and high voltage terminals and that the cooling equipment is working properly.

　　Check whether the surrounding transformer is clean and whether there are flammable and explosive substances to eliminate potential safety hazards.

　　In order to ensure the safe operation of oil-immersed transformers, it is necessary to hire professional and qualified maintenance personnel for regular maintenance to ensure the safety of users.