1. Inspection and repair of transformer butterfly valve, throttle and oil plug: 1. Check whether the shaft, baffle and other components of the butterfly valve are complete, flexible and tight, and replace the sealing gasket. After 0.05Mpa oil pressure test, the baffle should be closed tightly, no serious leakage, the shaft seal is good, and the “open†and “closed†position marks are clear and correct. 2. The throttle (accident discharge door, oil release door) should be disassembled and repaired, ground and replaced with sealing packing. After the inspection, 0.15Mpa oil pressure test should be done without leakage. 3. For the transformer body and accessories, venting plugs, oil drain plugs, oil-like throttles, etc., should be thoroughly inspected. Replace the gaskets and seal them well without leakage. Second, talk about the processing method of transformer oil:
In order to improve the insulation strength and dielectric loss coefficient of the transformer oil, the transformer oil must be treated to remove moisture, gas and impurities from the oil before it is injected into the fuel tank. In practical applications, we have targeted treatments for different types of transformer oils, and the effect is better.
1. For transformer oils that are generally contaminated by impurities such as water and dust, plate and frame pressure filters can be used. After multiple cycles of filtration, they can usually meet the requirements. Its principle is to use oil filter paper to absorb moisture and filter impurities. Because of its simple structure and convenient handling, it is also widely used. The disadvantage is that the filtration is not thorough, the removal effect on fine impurities is not good, and the cost is relatively high. When the moisture is large, the oil filter paper needs to be frequently replaced.
2, now commonly used is a vacuum oil filter, which not only can completely remove the moisture and gas in the oil, but also can effectively remove tiny impurities. The process flow is: transformer oil to be processed → coarse filtration → fine filtration → heating oil vacuum dehydration degassing → net oil. The coarse filter uses a metal filter and a strong magnet, and the fine filter usually filters fine impurities of 1 to μm. At present, there are many types of fine filters, such as metal powder sintered materials, metal microporous materials, ceramic filter materials, and filter paper filters with special structures.
Transformer oil is heated and vacuumed to degas. The principle is to vacuum the oil tank, and the heated transformer oil is sprayed to form an oil mist, so that the gas and moisture in the oil escape. The oil temperature is generally around 65 ° C, not too high, so as not to age the oil. This method has better dehydration and degassing effect and is a commonly used method at present. However, if the oil is sprayed into a very fine mist, it is easily pumped away by the vacuum pump.
If the oil is sprayed into oil beads having a certain diameter, the water and gas in the oil beads are not easily exerted due to the high interfacial tension of the oil beads. For this reason, the diameter of the squirt hole should be properly selected, and it is generally necessary to provide several baffles at the pumping port of the tank to prevent the transformer oil from being pumped away by the vacuum pump.
At present, a relatively advanced membrane dehydration and degassing method is adopted in foreign countries and domestically, which means that the oil entering the tank passes through some degassing components to form a very thin oil film, and the whole process of dehydration and degassing is always completed in the state of oil film. Therefore, the moisture and gas in the oil are easily removed. 3. Treatment method of contaminated transformer oil. Contaminated transformer oil (commonly known as slop oil) refers to a colloid-contaminated transformer oil formed by a combination of extremely small impurities and oil molecules, and transformer oil that has been used for many years, generally released from reworked products. Oil (the pH of this oil is already very low). For this type of slop oil, it must be treated by adsorption to improve the oil index. Generally, silica gel (SiO2) or activated alumina (A12O3) is used as the adsorbent. In the sewage treatment system, in order to ensure sufficient contact between the silica gel and the transformer oil, and to facilitate the replacement of the silica gel, a plurality of separators are arranged in the silica gel tank, and the silica gel is placed in a small cloth bag for rotation, and cannot be bulk. The heated transformer oil is sent to the silica gel tank for a certain period of time, so that the adsorption effect is fully exerted, and then injected into the clean oil tank through the oil filter. During the treatment process, it should be monitored regularly to determine the adsorption effect. When the adsorption effect is not obvious, the silica gel should be considered. Generally, the amount of silica gel is about 3% to 5% by weight of the oil. The slop oil treatment system should be separated from the new oil treatment system to avoid cross-contamination. Tanks, containers, etc. with used slop oil must be thoroughly cleaned before they can be used in normal production.
In order to improve the insulation strength and dielectric loss coefficient of the transformer oil, the transformer oil must be treated to remove moisture, gas and impurities from the oil before it is injected into the fuel tank. In practical applications, we have targeted treatments for different types of transformer oils, and the effect is better.
1. For transformer oils that are generally contaminated by impurities such as water and dust, plate and frame pressure filters can be used. After multiple cycles of filtration, they can usually meet the requirements. Its principle is to use oil filter paper to absorb moisture and filter impurities. Because of its simple structure and convenient handling, it is also widely used. The disadvantage is that the filtration is not thorough, the removal effect on fine impurities is not good, and the cost is relatively high. When the moisture is large, the oil filter paper needs to be frequently replaced.
2, now commonly used is a vacuum oil filter, which not only can completely remove the moisture and gas in the oil, but also can effectively remove tiny impurities. The process flow is: transformer oil to be processed → coarse filtration → fine filtration → heating oil vacuum dehydration degassing → net oil. The coarse filter uses a metal filter and a strong magnet, and the fine filter usually filters fine impurities of 1 to μm. At present, there are many types of fine filters, such as metal powder sintered materials, metal microporous materials, ceramic filter materials, and filter paper filters with special structures.
Transformer oil is heated and vacuumed to degas. The principle is to vacuum the oil tank, and the heated transformer oil is sprayed to form an oil mist, so that the gas and moisture in the oil escape. The oil temperature is generally around 65 ° C, not too high, so as not to age the oil. This method has better dehydration and degassing effect and is a commonly used method at present. However, if the oil is sprayed into a very fine mist, it is easily pumped away by the vacuum pump.
If the oil is sprayed into oil beads having a certain diameter, the water and gas in the oil beads are not easily exerted due to the high interfacial tension of the oil beads. For this reason, the diameter of the squirt hole should be properly selected, and it is generally necessary to provide several baffles at the pumping port of the tank to prevent the transformer oil from being pumped away by the vacuum pump.
At present, a relatively advanced membrane dehydration and degassing method is adopted in foreign countries and domestically, which means that the oil entering the tank passes through some degassing components to form a very thin oil film, and the whole process of dehydration and degassing is always completed in the state of oil film. Therefore, the moisture and gas in the oil are easily removed. 3. Treatment method of contaminated transformer oil. Contaminated transformer oil (commonly known as slop oil) refers to a colloid-contaminated transformer oil formed by a combination of extremely small impurities and oil molecules, and transformer oil that has been used for many years, generally released from reworked products. Oil (the pH of this oil is already very low). For this type of slop oil, it must be treated by adsorption to improve the oil index. Generally, silica gel (SiO2) or activated alumina (A12O3) is used as the adsorbent. In the sewage treatment system, in order to ensure sufficient contact between the silica gel and the transformer oil, and to facilitate the replacement of the silica gel, a plurality of separators are arranged in the silica gel tank, and the silica gel is placed in a small cloth bag for rotation, and cannot be bulk. The heated transformer oil is sent to the silica gel tank for a certain period of time, so that the adsorption effect is fully exerted, and then injected into the clean oil tank through the oil filter. During the treatment process, it should be monitored regularly to determine the adsorption effect. When the adsorption effect is not obvious, the silica gel should be considered. Generally, the amount of silica gel is about 3% to 5% by weight of the oil. The slop oil treatment system should be separated from the new oil treatment system to avoid cross-contamination. Tanks, containers, etc. with used slop oil must be thoroughly cleaned before they can be used in normal production.
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