Oil Immersed Transformer Oil Leakage Treatment

Oil-immersed transformers work with transformer oil, and various operations on oil-immersed transformer oil are also carried out. The common problem of oil-immersed transformer oil is oil leakage. Oil leakage makes the performance of the transformer gradually deteriorate. It is lost, making the dangerous performance of oil-immersed transformers aggravated. Therefore, when oil leakage is found, it should be dealt with in time. The common treatment methods are as follows:

1. Oil leakage from seals of oil immersed transformers

Reason: Poor sealing. Usually, the seal between the box edge and the box cover is sealed with oil-resistant rubber rods or rubber gaskets. If the joints are not handled properly, it will cause oil leakage failure. Some are bound with plastic tapes, and some are directly pressed together with the two ends. Due to the rolling during installation, the interface cannot be pressed firmly, and the sealing effect cannot be achieved, and oil is still leaking.

Countermeasures: Fushi blue material can be used for bonding, so that the joint is formed as a whole, and the oil leakage phenomenon can be greatly controlled; if the operation is convenient, the metal shell can also be bonded at the same time.

2. Oil leakage from bolts or pipe threads of oil cooled transformers

Source of failure: rough processing and poor sealing when leaving the factory, oil leakage occurs after the oil-immersed transformer is sealed for a period of time.

Treatment method: First, the bolts can be sealed with polymer materials to achieve the purpose of controlling leakage. The second is to unscrew the bolts (nuts), apply Fu Shilan mold release agent on the surface, and then apply the material on the surface to tighten.

3. Oil leakage from iron castings of oil filled transformers

The main reason: There are sand holes and cracks in the iron castings.

Countermeasures: If the crack is leaking, drilling a crack prevention hole is the best way to relieve stress and avoid extension. During treatment, lead wire can be driven into the leakage point or riveted with a hand hammer according to the crack situation. The leak was then cleaned with acetone and sealed with material. In the case of casting trachoma, it can be directly sealed with the material.

4. Oil leakage from the radiator of the oil-immersed transformer

Source of failure: The heat pipe of the radiator is usually made of seamed steel pipe after being flattened and made by stamping. Oil leakage often occurs in the bending part and the welded part of the heat pipe. This is because the outer wall of the pipe is under tension when the heat pipe is punched. The inner wall is under pressure and there is residual stress.

Treatment method: Close the upper and lower flat valves (butterfly valves) of the radiator to isolate the oil in the radiator from the oil in the tank, reducing pressure and leakage. Appropriate surface preparation is applied after the leak has been identified and then sealed with Fuchs Blue.