1.Product Overview
        Medium & High Voltage High-Altitude Switchgear is indoor metal-enclosed equipment designed for altitudes ≥1,000m, compliant with IEC 62271 series standards. Featuring modular construction, its primary compartments (circuit-breaker, busbar, cable, and instrument) are gas-segmented for safety. It addresses critical challenges at high altitudes—reduced insulation strength and impaired heat dissipation due to thin air—through enlarged creepage distances, altitude-grade insulating materials, and forced-air cooling/heat-sink designs.

2.Primary Functions
        Circuit Breaking & Making: Interrupt normal/fault currents via circuit breaker/load switch;
        Electrical Isolation: Isolate circuits for maintenance using disconnectors;
        Earthing Protection: Integrated earthing switches for residual charge dissipation;
        Relay Protection Coordination: Supports Protection Relay  (overcurrent, instantaneous, earth-fault);
        Measurement & Monitoring: Equipped with current/voltage transformers (CT/VT) and smart meters;
        Interlocking System: Mechanical/electrical interlocks for “five preventions” safety (IEC 62271-200);
        High-Altitude Adaptation: Enhanced insulation, thermal management, and condensation control.

3.Product Functions (Detailed)
        Electrical Control:Vacuum/SF6 circuit breaker operation (electrical/manual), opening time ≤60ms;
        Safety Protection:Fully enclosed armored structure, arc-resistant class ≥IAC AFLR 20kA/1s (IEC 62271-200);
        Smart Monitoring:Integrated temp/humidity sensors, intelligent control unit, RS485 (Modbus);
        Environmental Adaptability:Cabinet heaters, fan cooling (thermostat-controlled), max. altitude: 5,000m;
        Maintenance Accessibility:Automatic shutter locking, interchangeable truck design, spacious cable chamber.

4. Product Parameters (International Standards)
Electrical Parameters:
        Rated Frequency: 50/60Hz (IEC 60038);
        Rated Short-Time Current Duration: 3 seconds (IEC 62271-1);
        Partial Discharge Level: ≤10pC (12kV, IEC 60270).

Mechanical Parameters:
        Mechanical Endurance: Circuit breaker ≥10,000 operations; disconnector ≥3,000 operations;
        Operating Torque: Earthing switch ≤150N·m.

Environmental Parameters:
        Operating Temperature: -25°C to +40°C (low-temp variants available);
        Relative Humidity: Daily average ≤95%, monthly average ≤90%.

5. Product Features
1).Altitude-Enhanced Insulation:
        20–50% larger electrical clearances (e.g., phase-to-phase ≥300mm for 40.5kV);
        RTV anti-tracking coating or silicone rubber insulators.

2).Thermal Management:
        Top-mounted centrifugal fans + bottom louvers for forced convection;
        Heat sinks for high-power components.

3).High-Reliability Components:
        Altitude-derated CTs/VTs (IEC 60044 compliance);
        Low-temperature seals (-40°C silicone).

4).Smart Operation Support:
        Wireless temperature monitoring (contacts/busbars); arc-flash protection interface;
        Condition data integration with SCADA systems.

       Standards Compliance: IEC 62271-200 (HV switchgear), IEC 60694 (HV equipment general rules), IEC 60044 (instrument transformers), GB/T 11022 (Chinese national standard alignment).
       Core Value: Resolves insulation degradation and thermal limitations at high altitudes, ensuring grid safety in extreme environments.

Switchgear Models & Dimensions
Common Models:
Medium Voltage: KYN28A-12(Z), KYN61-40.5 (withdrawable type)

Fixed Type: XGN17-40.5
Standard Dimensions (W × D × H, mm):
Medium Voltage (12kV): 800 × 1500 × 2300
High Voltage (40.5kV): 1200 × 2500 × 2800
(Note: Dimensions may vary slightly by manufacturer)