please select HUIYUE transformer bushing auto through machine manufacturer.

Color casing machine environment conditions:
  Altitude ≤1000m
Ambient air temperature -25 ℃ ~ + 40 ℃ (DB25), - 40 ℃ ~ + 40 ℃ (DB45)

Altitude correction method: When the altitude of more than 1000m, rather than 4000m, the fundamental principles of the law of the classic bar Shen (mainly because of the higher altitude, the lower the pressure, with the height of the discharge voltage becomes smaller), external transformer relationship insulation and altitude using a simple formula that increases the percentage of: (altitude -1000m) / 100.

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Source：HUITUE transformer bushing auto through machine Manufacturers