This product is the three-phase AC frequency 50Hz outdoor high-voltage transmission equipment, used in no load conditions to be switched on or off to high voltage lines, switching of high voltage line, change the operation mode, the electrical isolation and maintenance of bus and breaker of high voltage electrical equipment safety.

A. is not more than 1000m at altitudes.

The air temperature around B.: the upper limit is +40 C in the general area, the lower limit is -30 C in the general area, and the high and cold region is -40 C.

C. wind pressure does not exceed 700pa. (equivalent to wind speed 34m/s).

D. no frequent and violent vibration places.

E. ordinary installation places should not seriously affect the insulation and electrical conductivity of the gas and steam. Chemical precipitation, smoke, dust and other explosive, erosive substances.

The f. antifouling type is suitable for heavy stains, but it should not cause fire and explosive material.