Transformer oil degassing is a process that allows to improve transformer operation reliability and protect the equipment from oxidation.
What is the degassing rate of transformer oil? The degassing rate is the percentage of the content of a certain component in the degassed gas to the original content of a certain component in the transformer oil sample, which is the degassing rate of this component.
1) Increase the vacuum of the degassing chamber as much as possible.
With a Transformer Oil Filtering degassing and drying unit, user can perform dehydration and degassing of transformer oil. In a sense, the degree of vacuum in the degassing chamber (vacuum chamber) of the Transformer Oil Purifier plays an important role in the degassing effect. The higher the vacuum, the higher the degassing efficiency. Because of its high degree of vacuum, not only the gas will be quickly separated from the transformer oil, but also the oil sample and the degassing tank will have a large pressure difference, which will increase the oil injection speed and cause a large amount of dissolved gas (about 10% of the volume of the oil) from the oil quickly, impacting the oil sample, making the oil sample foamy, greatly increasing the dispersion state of the oil sample, and accelerating the separation of the gas. In addition, the high vacuum degree will reduce the air content so that after the degassing tank is degassed and returned to normal pressure, the dilution of the concentration of gas components by the residual air volume will be avoided.
For transformer oil within 110KV, PureTech's single-stage vacuum transformer oil purifier can be selected; for transformer oil above 110KV, it is recommended to choose PureTech's double-stage high-vacuum Transformer Oil Purifierr, which uses a dual vacuum pump system to form a higher vacuum for the vacuum degassing chamber.
2) The number of degassed oil samples should be reduced as much as possible while meeting the requirements of the number of gas samples. Too many degassed oil samples occupy a large degassing space. With the increase of the degassed gas, the pressure of each component increases. The degassing rate is slowed down from the transformer oil, especially for those gases with high solubility in oil, such as C1~C3 hydrocarbon gases, the reduction effect is more obvious. Therefore, the amount of degassing oil is less, and the larger the degassing tank is.
3) Prevent the redissolving of the outgassing.
After the gas is released from the oil, some of the gas may be re-dissolved in the oil, that is, re-dissolved. The reason for this re-dissolution is: as the content of the degassing gas increases, the partial pressure of the gas in the degassing chamber also increases. According to Henry's law, the speed of the degassing gas back into the oil also increases. According to Henry's law, the degassing rate at which the gas is re-entered into the oil is also increased, resulting in the redissolution of the gas. In addition, when the oil level fluctuates, the re-dissolving speed is also accelerated, so in order to eliminate this effect as much as possible, during the degassing operation, it is necessary to remove the escaping gas as soon as possible, and prevent the fluctuation of the oil level.
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