Reasons for acetylene in oil: First, the transformer oil itself contains acetylene; second, the oil is partially overheated and decomposed due to electric heating, forced filtering or friction of mechanical oil transmission system during oil filter treatment, resulting in hydrogen, acetylene, methane and other gases. The working principle of vacuum oil filter should be to separate water, gas and low distillate from oil by evaporation. Its separation capacity is related to working vacuum degree, oil temperature, oil film evaporation area and evaporation time. For each vacuum oil filter, its gas separation capacity is relatively fixed. However, due to the strong binding force of extremely small amount of water, gas and oil molecules, the separation capacity of general vacuum oil filters is limited. No matter how long the oil is filtered, when the limit equilibrium is reached, the oil still contains a small amount of gas and water, which is why many vacuum oil filters cannot completely remove acetylene.

It is normal that the transformer oil in operation contains acetylene, which is a parameter for analyzing the transformer fault state.

Acetylene in the new transformer oil is left over due to the imperfect performance of the vacuum oil filter; The excellent oil filter ensures zero acetylene.