Six signs you may need to replace an oil-filled transformer
Time：2024-11-25 Auther：ZTelec-www.ztelectransformer.com
Oil-immersed transformer
An oil-immersed transformer is an electrical device widely used in power systems for the conversion and transmission of electrical energy. Its structure mainly consists of a transformer core, windings, and insulating oil. The insulating oil not only provides insulation but also effectively dissipates heat to ensure the stable operation of the transformer.
Oil-immersed transformers have several superior performance characteristics. Firstly, their excellent heat dissipation capability allows the transformer to operate continuously at higher loads, extending the equipment’s lifespan. Secondly, the electrical insulation properties of the oil effectively prevent short circuits and other electrical faults, ensuring the safe operation of substations. Additionally, oil-immersed transformers have a wide range of capacities, making them suitable for various scale power systems, from small industrial applications to large power plants.
Despite the important role oil-immersed transformers play in power transmission, they also have some drawbacks. For example, the insulating oil inside the transformer is flammable, posing a certain fire risk. Additionally, during long-term use, oil aging may lead to performance degradation, necessitating regular maintenance and replacement.
How Long Do Oil-Filled Transformers Usually Last?
The typical lifespan of an oil-filled transformer is around 20-30 years, but some high-voltage models that are kept in pristine conditions can last 50 or 60 years! Most of the time, these transformers will outlast the career of the person who ordered or installed them.
As you may have guessed, one of the best ways to improve the lifespan of a transformer is to minimize harsh operating conditions and stay up-to-date with maintenance requirements.
Six signs you may need to replace an oil-filled transformer
Oil color: Normal transformer oil should be bright yellow and transparent. If the oil color turns black or dark, it indicates that the oil has been contaminated or stressed. In this case, the transformer may need to be replaced.
Dissolved gas oil test (DGA test): By detecting the dissolved gas composition in the transformer oil, you can determine whether there is a fault inside the transformer. If abnormal levels of certain specific gases are detected, it may be time to replace the transformer.
Leaks: Frequent leaks can usually be fixed. But if a leak needs to be fixed frequently, it could be a sign of a larger problem. Timely replacement of transformers can avoid major economic losses caused by leakage.
Infrared: Similar to a doctor using an X-ray to examine the body, infrared scans can detect if a transformer is overheating. If some parts are found to be overheating, the transformer may need to be replaced to avoid a larger failure.
Paint condition: Transformers near failure often heat up, which can cause exterior paint to flake or discolor. If the transformer paint is damaged and accompanied by other warning signs, a replacement may need to be considered.
Noise and vibration: If the transformer emits abnormal noise or vibration, especially the dry type transformer emits a “crackling” discharge sound, this may be a signal of internal failure. Check for power outage immediately and replace transformer if necessary .
Why replace the oil-filled transformer?
1.Ensure the reliability and safety of the transformer
The oil in the oil-filled transformer is mainly used as an insulating medium and is crucial to the insulation characteristics of the transformer. Filling with oil can effectively improve the insulation strength, prevent the insulation oil solidification or deterioration, and reduce the occurrence of leakage phenomenon. At the same time, full oil can also prevent partial discharge, so as to ensure the stability and safety of the transformer.
2.Improve the heat dissipation effect and service life of the transformer
The transformer will generate a lot of heat during the working process, and its temperature must be kept stable by heat dissipation. Filling with oil can form a uniform pressure between the high-temperature parts of the transformer and the cooling parts. This can make the heat dissipation effect is better and extend the service life of the transformer. In addition, the thermal conductivity of oil is higher than that of air, which can dissipate heat better and effectively avoid the problem of transformer overheating.
3.Reduce electricity consumption and carbon emissions
The oil has good thermal conductivity and insulation, which can effectively reduce the operating temperature of the transformer, improve its energy loss efficiency, and then reduce power consumption and carbon emissions. The parameters of the new transformer are optimized to reduce current and power losses, improve the energy efficiency of the equipment, and achieve energy conservation and emission reduction goals.
