1. Operating Conditions for Air-Type Bus Ducts

Ambient Temperature

Upper Limit: +40°C

Lower Limit: -25°C

Altitude: Below 2000m

Humidity

Relative humidity does not exceed 50% at a maximum temperature of +40°C; higher relative humidity is permissible at lower temperatures.

Condensation Conditions: Present

Seismic Basic Intensity: 6-degree fortification

Installation Location: Indoor, Outdoor

2. Insulation Resistance: The insulation resistance value of each enclosed bus unit shall be greater than or equal to 100MΩ (2500V megger).

3. Dielectric Strength: Each enclosed bus unit is subjected to a 1-minute power-frequency dry withstand voltage test before leaving the factory.

Wuhan Bus Duct

Power-frequency withstand voltage and lightning impulse withstand voltage values comply with standard requirements.

4. Grounding System: Complies with the requirements of IEC 364-5-54 for grounding systems.

5. Protection Level: Indoor Type: IP40; Outdoor Type: IP43, IP55.

6. Load Performance: Under rated current, the temperature rise of the enclosure meets the standard requirements of GB 763-90 "Heating of AC High-Voltage Electrical Equipment Under Long-Term Operation".

7. Short-Circuit Performance: Dynamic and thermal stability tests comply with the standard requirements of GB 2706-89 "Test Methods for Dynamic and Thermal Stability of AC High-Voltage Electrical Equipment".