Its oil-feed pump is a gear pump, while its oil drain pump is a canned pump. The gas extraction system is a combination of a rotary-vane vacuum pump and Roots pump. This type has an evacuation interface to connect to an external vessel, which could be used as a vacuum group. It is used for treating oil when the transformer or oil storage tank is lower than the vacuum oil treatment plant (with a horizontal difference of < 5 m), and enable oil treatment when the distance between the transformer or oil storage tank and the vacuum oil treatment plant is more than 15 m but less than 100 m.
Oil filtration indexes:
- After one treatment, the moisture content is ≤ 4±2 ppm; the gas content, ≤ 0.1 %