Vacuum system in transformer vacuum drying equipment
The configuration of the vacuum system in the transformer transformer vacuum drying equipment In the vacuum drying equipment of the transformer, the vacuum degree that can be achieved by the water ring mill can not meet the requirements of the transformer drying, and most of them are equipped with the sliding valve millet or the rotating disc. However, due to the large amount of water in the drying process, the situation of the chestnut oil is serious, and some even require a process to change the oil. In order to solve this problem, our company used oil seal millet and water ring millet in parallel. In the process, the water is firstly pumped out with water, and then the oil is sealed and evacuated. However, since the ultimate vacuum of the water ring spring is only 4 kPa, it can only reach about 1 Pa in practical use, so the problem of millet oil can not be completely solved. In view of this situation, our company has made improvements to the system, using the configuration shown in Figure 1.
In this system, in the stage where the vacuum degree of the transformer preheating is not high, the water tank can be used alone to evacuate the drying tank, and in the high vacuum stage, the water ring mill and the sliding valve are used together as an example. As a practice test of the front-stage station of the sluice valve, the water ring is not only a good solution to the problem of oil accumulation, but also improves the ultimate vacuum of the vacuum unit.
Sliding valve millet relies on volume change to compress low pressure gas to exhaust pressure. Its exhaust pressure is composed of the external atmospheric pressure, the static pressure generated by the oil level in the fuel tank, and the consumption pressure of the exhaust valve. The value is about 1 morpholine, that is, the valve mill must compress all the gas to 0.1 pass 3 to discharge the millet. If the operating temperature of the sliding valve miller is 60°, the saturated vapor pressure of the water corresponding to this temperature is 201. 3. If the water vapor is prevented from condensing in the exhaustion, the water vapor content of the pumped gas must not exceed 1/ The pumping gas is compressed to 0.1 times the water vapor partial pressure of 3 flavors to reach the saturated vapor pressure of water, which is obviously difficult for the drying process. Before we used the gas-fired valve's miserable effect to relatively reduce the water vapor content, to achieve the purpose of eliminating water vapor, but the amount of miserable gas is difficult to grasp, and the vacuum will be reduced. Now we use the water ring spring to evacuate the slide valve, shake the 7 long working volume of the millet, which greatly reduces the exhaust pressure of the valve, and the exhaust pressure is only about 03Pa, so that the water vapor is in the pumped gas. The content of the shake can be increased to 2/3, which can basically meet the requirements of the dry condition of the transformer, thus replacing the gas shouting to prevent the water vapor from liquefying during the compression process. The oil and gas mixture that has been discharged from the sliding valve is quickly separated under the action of water ring miller, and the gas and water vapor are pumped away, which not only avoids the Guohuaization of the oil but also acts as a degassing and purifying effect on the circulating chestnut oil.
Since the evaporation of water vapor is avoided, the oil of the oil is removed, and the degassing and purification is obtained without using the gas cylinder to call the vacuum millet. Therefore, the working vacuum of the valve is greatly improved. The soot discharged from the spool spring is cooled by contact with water and water, and is discharged with water to avoid pollution to the atmosphere. Because the system has water resistance, the condenser is only required to reduce the temperature of the pumped gas, which simplifies the configuration of the condenser and the configuration of the vacuum system.
Ren:, Zhongshan Zhongshan Kaixuan Vacuum Technology Engineering Co., Ltd., Guangdong Zhongshan Leather 84 Qiao 2.5 bow and advanced advanced vacuum, temperature measuring instruments At present, the vacuum industry has more used vacuum testing instruments in the transformer industry. Leybold's pressure sensors and Pirani of Wang's WA assisted company. The quality of domestic products is still somewhat different from that of foreign countries. Since the correctness of vacuum and temperature measurement is directly related to the quality of the product, it is appropriate to use imported products for key components.
3 Conclusion Through the above technical transformation, the hot air circulation heating vacuum tank is transformed into a variable pressure drying equipment, and the funds for the transformation of the hardware invested in it and the capital of the production software are more economical than the transformation of the kerosene vapor phase drying equipment. A lot, and can make the old equipment play the residual value.
Therefore, it is feasible to transform the transformer drying equipment by the transformation method.
In this system, in the stage where the vacuum degree of the transformer preheating is not high, the water tank can be used alone to evacuate the drying tank, and in the high vacuum stage, the water ring mill and the sliding valve are used together as an example. As a practice test of the front-stage station of the sluice valve, the water ring is not only a good solution to the problem of oil accumulation, but also improves the ultimate vacuum of the vacuum unit.
Sliding valve millet relies on volume change to compress low pressure gas to exhaust pressure. Its exhaust pressure is composed of the external atmospheric pressure, the static pressure generated by the oil level in the fuel tank, and the consumption pressure of the exhaust valve. The value is about 1 morpholine, that is, the valve mill must compress all the gas to 0.1 pass 3 to discharge the millet. If the operating temperature of the sliding valve miller is 60°, the saturated vapor pressure of the water corresponding to this temperature is 201. 3. If the water vapor is prevented from condensing in the exhaustion, the water vapor content of the pumped gas must not exceed 1/ The pumping gas is compressed to 0.1 times the water vapor partial pressure of 3 flavors to reach the saturated vapor pressure of water, which is obviously difficult for the drying process. Before we used the gas-fired valve's miserable effect to relatively reduce the water vapor content, to achieve the purpose of eliminating water vapor, but the amount of miserable gas is difficult to grasp, and the vacuum will be reduced. Now we use the water ring spring to evacuate the slide valve, shake the 7 long working volume of the millet, which greatly reduces the exhaust pressure of the valve, and the exhaust pressure is only about 03Pa, so that the water vapor is in the pumped gas. The content of the shake can be increased to 2/3, which can basically meet the requirements of the dry condition of the transformer, thus replacing the gas shouting to prevent the water vapor from liquefying during the compression process. The oil and gas mixture that has been discharged from the sliding valve is quickly separated under the action of water ring miller, and the gas and water vapor are pumped away, which not only avoids the Guohuaization of the oil but also acts as a degassing and purifying effect on the circulating chestnut oil.
Since the evaporation of water vapor is avoided, the oil of the oil is removed, and the degassing and purification is obtained without using the gas cylinder to call the vacuum millet. Therefore, the working vacuum of the valve is greatly improved. The soot discharged from the spool spring is cooled by contact with water and water, and is discharged with water to avoid pollution to the atmosphere. Because the system has water resistance, the condenser is only required to reduce the temperature of the pumped gas, which simplifies the configuration of the condenser and the configuration of the vacuum system.
Ren:, Zhongshan Zhongshan Kaixuan Vacuum Technology Engineering Co., Ltd., Guangdong Zhongshan Leather 84 Qiao 2.5 bow and advanced advanced vacuum, temperature measuring instruments At present, the vacuum industry has more used vacuum testing instruments in the transformer industry. Leybold's pressure sensors and Pirani of Wang's WA assisted company. The quality of domestic products is still somewhat different from that of foreign countries. Since the correctness of vacuum and temperature measurement is directly related to the quality of the product, it is appropriate to use imported products for key components.
3 Conclusion Through the above technical transformation, the hot air circulation heating vacuum tank is transformed into a variable pressure drying equipment, and the funds for the transformation of the hardware invested in it and the capital of the production software are more economical than the transformation of the kerosene vapor phase drying equipment. A lot, and can make the old equipment play the residual value.
Therefore, it is feasible to transform the transformer drying equipment by the transformation method.
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