(1) transformer oil test. The transformer oil and every new batch of supplementary oil to the equipment shall be provided as the basis for the inspection report. Field sampling shall also be taken as a simplified test. Project: flash point, insulation strength, acid value, water soluble acid, free carbon, water and mechanical mixture. If the insulation strength is not qualified in the analysis result, the filter can be filtered until the pressure resistance is qualified. The oil pressure test is often carried out in the oil treatment process.
(2) transformer oil sampling. Frosted glass bottle oil sampling bottle of the best selection of 500ml, carefully wash clean sampling in front of the oven drying, when sampling should be taken to the bottom or the bottom of the barrel, first open the drain valve, the valve port rushed to the stolen goods, then sampling bottle oil washed two times, and then filled with oil, then the stopper plug good. If you want to send to the field, you should seal the bottle and seal it with wax.
(3) oil filtration method. The common filtration methods are pressure filtration method, centrifugal separation method and vacuum spray method of three kinds.
1) the pressure filter uses a pressure oil filter, which uses the pressure of the oil pump to force the oil through the filter paper to remove the stolen goods and moisture.
2) centrifugal separation is the use of centrifugal oil filters, the use of centrifugal force will be greater than the density of oil moisture and impurities separated from the oil. In addition to water, the proportion of contaminants contained in the oil is generally less than that of the oil. Therefore, it is necessary to increase the number of revolutions to enhance the ability of separation.
3) vacuum oil filters allow oil to filter out trace amounts of water and gas at high vacuum and at very high temperatures. When the oil tank through vacuum spray pipe, spraying fine droplets, water in oil (gas) in the vacuum state by evaporation by negative pressure exhaust, and oil dropped back to the lower oil chamber by a pump out. Taking the water vapor through the cooler and water separator condensation and precipitation; in a vacuum container in the oil gas process with vacuum discharge; at the same time with the coarse and fine filter in the vacuum oil filter machine, used to remove oil in debris. 110kV transformer oil filter should be carried out with a vacuum oil filter to ensure that the water content of transformer oil reaches 20ul/l (ppm).
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