Causes
1. Oil leakage from the sealing components of oil immersed transformers
Reason: Poor sealing. The edge and cover of the transformer box, as well as the oil guide pipe and oil conservator, are generally sealed with oil resistant rubber rods or rubber pads. If there are situations such as incomplete sealing process treatment, poor sealing quality, and aging of the sealing rubber, it can cause oil leakage faults.
2. Oil leakage from bolts or pipe threads of oil immersed transformers
Fault source: Rough processing and poor sealing when leaving the factory. Oil leakage occurs after an oil-immersed transformer is sealed for a period of time.
3. Oil leakage from cast iron parts of oil immersed transformers
Main reason: Sand holes and cracks in cast iron parts.
4. Oil leakage from the radiator of oil immersed transformers
Source of fault: The heat dissipation pipe of a radiator is usually made by pressing and flattening a slotted steel pipe. Oil leakage often occurs in the bent and welded parts of the heat dissipation pipe, which is caused by the tension on the outer wall of the pipe and the pressure on the inner wall during stamping, resulting in residual stress.
5. Oil leakage from porcelain bottles and glass oil labels of oil immersed transformers
Reason: The probability of oil leakage from porcelain bottles and glass verniers is the highest, and the cause of faults is usually due to poor installation technology or poor sealing performance. A good installation process can greatly extend the service life of the sealing element.
Suggestion:
Regularly check the oil level and quality of transformers, and promptly rectify any abnormalities found.
Oil Immersed Transformers
