Water Ingress And Moisture Of 3 Phase Oil Transformer
Water ingress and dampness of 3 phase oil transformer will do great harm to the electrical and physical and chemical properties of the insulation medium. The existence of water will destroy the insulation strength of the transformer oil, promote the corrosion of copper, iron and other metals by organic acids, and catalyze the oxidation of the transformer oil. As a result, the aging speed of the transformer oil will increase by 2-4 times compared with that of dry oil, and even the paper insulation will be permanently damaged. If the transformer is not treated in time due to water ingress and moisture, it may even cause the coil to break down to ground or the coil to turn short circuit, resulting in equipment damage.
During the operation of the 3 phase oil transformer, if it is found that the transformer is affected by water or moisture, it should be dried in time to avoid damage to the transformer equipment and affecting the safe operation of the power system. In addition, it is also necessary to do a good job of prevention to avoid water ingress and moisture in oil immersed transformers. Preventive measures are as follows:
1. Before changing or refueling the transformer, the oil shall be tested to prevent water from entering the oil due to improper storage.
2. Before refueling the transformer, drain a small amount of oil stored in the conservator, align the oiler with the oil filler, and then slowly add oil to ensure that the oil level is between 1 / 4-3 / 4 of the oil level.
3. When refueling or changing oil, it should be carried out at noon on a dry and sunny day, and oil should be filled in clean and dry containers. Never refuel the transformer in rainy weather.
4. Prevent oil shortage of transformer. When the oil level of the transformer drops below the transformer casing, the contact area between oil and air increases, and the transformer oil is easy to absorb moisture in the air and be affected by moisture.
5. Moisture absorbers shall be used for large capacity transformers to prevent moisture accumulation. For small capacity transformers, the height of the oil pipe connecting the body and the conservator at the oil pipe orifice in the conservator should be properly increased to prevent moisture from entering the transformer body.
In a word, when the 3 phase oil transformer is running, it is necessary to do a good job of prevention to avoid water ingress and moisture in the oil immersed transformer, so as to ensure the safe operation of the power system.
