Use environmental conditions
1. Altitude: no more than 2500; meters; plateau 4000 meters;
2. Ambient temperature: -30°C- - +409C (special requirements -40°C- +409C);
3. Relative humidity: the daily average is not more than 95%, the monthly average is not more than 90% (259C);
4. Wind speed: no more than 35 m/s;
5. The pollution level is Class l; the creepage distance of the porcelain sleeve is 1050mm (1320mm) (the nominal creepage distance is not less than 25 mm/kV).
6. There are no flammable substances, explosion hazards, chemical corrosion and severe vibration.