When selecting a Vacuum Transformer Oil Purification Plant to remove the gas content, the following basic requirements should be met.

The effect of the dissolved gas on the equipment after treatment by Transformer Oil Filtration Machine

The gas dissolved in the insulating oil is not significantly affected at low field strength, and under the action of high field strength, the gas is first ionized, and when the temperature and pressure suddenly drop to form bubbles, the bubbles are pulled into the body. It is prone to gas collision and dissociation, which causes breakdown and endangers the safe operation of equipment. The effect of bubbles in the oil on the insulation strength will increase with the voltage level, and the damage will be even worse. To this end, in order to ensure the reliability of transformer insulation, many countries have established specific quantitative standards for the oil in the new injection equipment and the gas content in the operating oil.

The standard for gas content in oils varies with the voltage level of the equipment. For example, for oil equipment of 500kV class, the oil content in the oil is controlled at 0.5% before oiling. The gas content in operation is 1%~2% according to the index proposed by the International Power Grid Conference.

It must be pointed out that the gas content in the running oil has a great relationship with the degree of sealing of the equipment and has nothing to do with the quality of the oil. That is, the sealing degree of the equipment is good, and the gas content of the oil in operation can be kept within the standard value range. Otherwise, the gas content in the oil will increase with time, even reaching a saturated state, that is, the gas content in the oil can reach about 10%. 

Therefore, in China's operating transformer oil quality standard GB7595), the gas content in the oil is not more than 1%. ACORE's Transformer Oil Filtration Machine can achieve 0.1% gas content after purification treatment. (Contact now sales@acorefiltration.com)