1. The on-board oil filter is equipped with ZYA-250 electronic two-stage vacuum oil filter.
2. The vehicle mounted oil filter is an ABB 500KV transformer that filters oil on site all over the country.
3. The oil filtering index shall meet the requirements of ultra-high voltage or ultra-high voltage transformer:
Oil breakdown voltage ≥ 70~80KV
Water content in oil ≤ 2 ～ 5ppm
Gas content in oil ≤ 0.1%
Acetylene content=0
Hydrogen content=0
Dielectric loss factor tg δ （90℃）≤0.001
The cleanliness of oil products shall meet the requirements of ultra-high pressure NAS class 3-6;
Or the cleanliness of oil products shall meet the ultra-high pressure requirements of NAS class 0~2.