Scope of Application: Designed for power plants, substations, and industrial distribution systems at altitudes above 1,000 meters, facilitating power distribution, equipment protection, and control in medium-high voltage (3.6kV–40.5kV) grids under high-altitude insulation and thermal constraints.
Rated Voltage Levels:Medium Voltage: 3.6kV, 7.2kV, 12kV, 24kV (IEC 62271-1)/High Voltage: 40.5kV (IEC 62271-200)
Insulation Levels:Power-frequency withstand voltage (1min): Per IEC 60694, e.g., ≥28kV for 12kV switchgear (sea-level value), adjusted for altitude;Lightning impulse withstand voltage: e.g., ≥75kV for 12kV switchgear (sea-level value).
Rated Current: 630A, 1250A, 1600A, 2000A, 2500A, 3150A, 4000A (IEC 62271-1).
Altitude Derating Factor: >1,000 meters; insulation strength decreases by 1% per 100m altitude increase (IEC 60694).