Vacuum oil filter adopts the principle of vacuum negative pressure, which can effectively remove the moisture and gas in the oil, and then remove impurities in the oil through high precision oil filter, so the pressure resistance value of the filtered oil will be greatly improved. Vacuum oil filter is to use the negative pressure flash principle, after heating oil in the negative pressure really fast separator, so that its water boiling point is reduced, into the flash vacuum separation tank. At this point, the fluid temperature is higher than the boiling point of the vacuum. The water boils and vaporizes rapidly in the flash tank, and the two phases are separated. The purpose of the flash tank is to provide space for rapid vaporization of fluids and separation of vapors and liquids.
Moisture, gas and impurities are the main factors that affect the pressure tolerance of insulating oil. The higher the pressure tolerance, the safer the electrical equipment will be. Insulation oil is a common insulation, arc extinguishing and cooling medium for electrical equipment. In order to ensure its good performance in the process of operation, it is necessary to carry out various tests on it regularly, especially the pressure test. The voltage withstand test of the insulating oil was carried out in a special breakdown voltage tester consisting of a porcelain or glass oil cup and two disk electrodes with a diameter of 25mm (to be smooth and without any marks of burning). During the test, the extracted oil samples were poured into the oil cup, and then electrodes were placed, so that the two electrodes were separated by 2.5mm. The test should be carried out in a room where the temperature is 10 ~ 35℃ and the relative humidity is not more than 75%.
Generally, the voltage withstand value of new insulating oil is between 35KV-55kV. When purchasing new transformer oil, we generally need to test the voltage withstand value of transformer oil. If it is not qualified, the effective way is to use vacuum oil filter to filter transformer oil, and the filtered oil can generally reach above 65KV.
On 2018-08-08 11:45:46
