Oil-immersed transformers are indispensable equipment in the power system. Their stable operation is crucial to ensuring the safety of the power grid. However, during long-term use, oil-immersed transformers may have leakage problems due to various reasons. Let's discuss how to deal with oil-immersed transformers leakage.
Identification and evaluation of leakage problems
1. Identification of leakage sources
Leaks may occur in multiple parts of oil-immersed transformers, such as flange connections, welds, seals, etc. Visual inspection, audio identification, or the use of professional testing equipment (such as infrared thermal imagers) can help determine the location of the leak. Common causes of leakage include poor sealing, aging of gaskets, poor welding quality, casting defects, etc.
2. Evaluation of the extent of leakage
Evaluating the extent of the leakage is a very important step. The severity of the problem is determined by the speed and amount of the leakage. Minor leaks may only require simple repairs, while severe leaks may require replacement of components or even the entire transformer.
Methods for dealing with leakage problems
1. Replace the gasket: Gasket aging is one of the main reasons for transformer oil leakage. Regularly check and replace aged gaskets, and select sealing materials with good oil resistance to ensure the sealing effect. At the same time, during the replacement process, ensure the installation quality of the gasket to avoid new oil leakage problems caused by improper installation.
2. Use plugging glue to plug: For some small-scale oil leakage problems, plugging glue can be used for plugging. This method is suitable for fine cracks in welds or local oil leakage of seals. The plugging glue should be a special glue suitable for transformer oil to ensure that it has good oil resistance and temperature resistance, and can effectively prevent oil leakage for a long time.
3. Welding repair technology: For oil leakage caused by cracks in the welding parts of the transformer box and other parts, welding repair can be used. First, the oil pollution in the leaking parts should be cleaned to avoid defects such as pores during welding. Then, according to the material of the box, a suitable welding process should be selected, such as manual arc welding, gas shielded welding, etc. If it is a smaller crack, it can be repaired step by step by spot welding. For larger areas of damage, continuous welding should be performed. During the welding process, we should pay attention to controlling the welding heat to prevent thermal damage to the insulation and other components inside the transformer, and fire prevention and other safety measures should be taken.
4. Improve the installation process: Before installing the gasket, check whether it has pores or cracks, and clean the surface. Bolt tightening should be done symmetrically and alternately, and tightened in batches to ensure uniform force. For uneven sealing surfaces, use a file or sandpaper to smooth them, or fill them with plugging glue. When installing the transformer, ensure safety and stability, choose reasonable hanging points, avoid damaging pipelines and sealing points, and strictly inspect purchased parts.
5. Bolt tightening technology: Sometimes, due to long-term operation of the transformer, the bolts at the connection parts become loose, resulting in poor sealing and oil leakage. At this time, the bolts at the relevant parts can be checked. And the loose bolts can be tightened with a suitable torque wrench according to the specified torque to ensure that the connection parts are tightly fitted and restore good sealing performance. At the same time, check whether the bolt threads are damaged. If damaged, replace the bolts in time to prevent oil leakage from occurring again.
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