Maintenance and technical treatment of throttle oil race of transformer butterfly valve

Maintenance and technical treatment of throttle oil plug of transformer butterfly valve inspection of transformer butterfly valve, throttle and oil plug Through 0.05Mpa oil pressure test, the baffle plate shall be sealed carefully without serious leakage, the shaft rod shall be sealed well, and the position marks of "open" and "close" shall be clear and accurate 2 The throttle (emergency exhaust throttle and release throttle) shall be disassembled and inspected, and the sealing packing shall be ground and replaced After the inspection, the 0.15Mpa oil pressure test shall be conducted without leakage 3 Conduct a comprehensive review on the movement of air release plug, oil drain plug, oil sample throttle and other parts of the transformer body and accessories, and replace the sealing gasket, which shall be well sealed without leakage Discussion on the treatment of transformer oil: in order to improve the edge strength and medium loss coefficient of transformer oil, the transformer oil must be treated before being injected into the oil tank to remove the moisture, gas and impurities in the oil In the actual use, we have carried out targeted treatment for different types of transformer oil, and the effect is better 1 For transformer oil generally polluted by impurities such as water and dust, plate and frame type pressure filter can be used After multiple cycles of filtration, it can usually reach the request Its principle is to use oil filter paper to receive moisture and filter impurities Because of its simple structure and convenient handling, it is also widely used The problem is that the filter is not thorough, the removal of fine impurities is not good, and the cost is also relatively high When the water content is large, the oil filter paper needs to be changed frequently 2 Now the vacuum oil filter is widely used It can not only completely remove water and body in the oil, but also effectively remove tiny impurities The technological process is: transformer oil to be disposed → coarse filtration → fine filtration → vacuum dehydration and degassing of heating oil → clean oil The coarse filter adopts metal filter and strong magnet, and the fine filter usually filters 1-μ m small impurities At present, there are many kinds of fine filter, such as metal powder sintering data, metal microporous data, ceramic filter material and filter paper core with special structure The transformer oil is heated, vacuumed, dehydrated and degassed The principle is to vacuumize the oil tank, spray the heated transformer oil to form oil mist, and make the gas and water in the oil escape The oil temperature is generally around 65 ℃, not too high, so as to avoid aging the oil This way of dehydration and degassing has better results, which is widely adopted at present However, if the oil is sprayed into a very small mist, it is easy to be evacuated by a vacuum pump If the oil is sprayed into an oil ball with a certain diameter, due to the high interfacial tension of the oil ball, the water in the oil ball and the body are not easy to be fully applied Therefore, the diameter of the spray hole should be selected properly, and several baffles should be set at the evacuation port of the tank to prevent the transformer oil from being pumped away by the vacuum pump At present, a more advanced membrane dehydration and degassing method has been adopted at home and abroad, that is, to make the oil entering the tank form a very thin oil film after some degassing elements, and always complete the whole process of dehydration and degassing with the condition of oil film, so that the water in the oil can be removed easily 3 Disposal methods of contaminated transformer oil Contaminated transformer oil (commonly known as dirty oil) refers to the transformer oil polluted by colloid formed by the combination of extremely small impurities and oil molecules, as well as the transformer oil used for many years, which is generally the oil discharged by the repair product (the pH value of this oil is very low) For this kind of dirty oil, it is necessary to use adsorption method to improve the oil index Silica gel (SiO2) or activated alumina (A12O3) are generally used as adsorbents In the waste oil treatment system, in order to ensure sufficient contact between silica gel and transformer oil, and to facilitate the replacement of silica gel, several diaphragms are set in the silica gel tank, and silica gel is put into a small cloth bag for rotation, and it is not allowed to be bulk After heating, the transformer oil is sent to the silica gel tank for a certain period of time, so that it can fully exert the adsorption effect, and then it is injected into the clean oil tank through the oil filter In the process of treatment, it should be monitored regularly to determine the adsorption effect When the adsorption effect is not obvious, it should be considered to change the silica gel Generally, the amount of silica gel accounts for 3% - 5% of the oil by weight The waste oil treatment system should be separated from the new oil treatment system to avoid cross contamination Tanks, containers, etc with used dirty oil must be thoroughly cleaned before being used in the normal production oil system