- Moisture content
- During the entire production and manufacturing process of transformers, the transformer manufacturers strictly control the moisture content of the products. Generally, transformers need to undergo processes such as gasoline liquid desiccation, vacuum pump oil pump, and hot oil circulation to remove moisture. However, there will still be a certain amount of moisture. The moisture in the transformer mainly accumulates in the insulating layer cardboard and the transformer oil, which will reduce the electrical performance of the transformer oil and the insulation layer cardboard, decrease the electrical resistance and pressure strength, and cause a sudden drop in the penetrating pressure strength as the moisture content increases. During the later stages of operation, especially during maintenance with covers, it is inevitable to introduce a certain amount of moisture. After the transformer oil undergoes thermal aging, it will also dissolve moisture. The internal moisture will continue to react with the insulating layer materials, accelerating the aging of the insulating layer materials. The results show that the aging rate of insulating paper in an environment with a humidity of 2% is 11 times that in an environment with a humidity of 0. Transformer oil aging
- Transformer oil will gradually age under the effects of electricity, heat and oxygen. After the aging of transformer oil, the level of gas dissolution, absorption and accumulation increases, resulting in an increase in gas and viscosity in the oil. The increase in gas will cause a decrease in the breakdown field strength of the oil insulation layer. The increase in operating viscosity will affect the working ability of the heat convection and heat conduction in the transformer’s circulation system, which cannot meet the operating standards of the transformer and will lead to a vicious cycle. This will have a significant impact on the operating life of the transformer and even cause machine equipment accidents. The influence of external natural forces
- External factors such as wind, heavy rainstorms, snowfall, hail, and earthquake disasters can also affect the service life of transformers. In such cases, various preventive measures should be taken based on specific circumstances. If necessary, power should be cut off.
