The purpose of transformer oil filter is to remove the water and impurities in the oil, improve the oil resistance to electricity, protect the paper insulation in oil, but also to a certain extent, improve the physical and chemical properties of oil.
Most of the power distribution transformers are installed in the open environment, the insulation oil (transformer oil) is affected by the external impurities, air contact and the operating temperature of the equipment itself. After the deterioration of insulating oil (transformer oil) will not play the proper insulation, cooling effect. In order to prevent the oil due to deterioration caused by the safe operation of the affected, to deal with the normal operation of the distribution of oil samples for testing and analysis, according to the results of the oil for the corresponding treatment. The inspection cycle of chemical monitoring of distribution operation oil shall be defined as at least 3 years. Routine inspection items include acid value, water soluble acid, flash point, breakdown voltage, external.
It should be noted that: if the equipment often load is relatively high, should be based on the provisions of the test cycle, increasing the frequency of inspection; if some indexes inspection items significantly close to the limits of control value, should also increase the frequency of inspection; because of the quality of running oil with aging degree and different impurity conditions a large, usually can not be solely a test project as the evaluation basis of condition of oil. Comprehensive analysis should be carried out according to the main characteristics.