Environmental conditions for prefabricated substations

1. Ambient air temperature:

Maximum temperature: +40℃;

Minimum temperature: -10℃;

Maximum daily temperature difference: 30K;

2. Altitude: 1000m;

a) When the altitude is 1000m and below, the external insulation level of the equipment is not subject to altitude correction, but the influence of pollution on it should be considered.

b) When the altitude is in the range of 1000-1500m, the external insulation level of the equipment shall be corrected according to the altitude of 1500m, but the influence of pollution on it shall be considered.

c) When the altitude is in the range of 1500-2000m, the external insulation level of the equipment shall be corrected according to the altitude of 2000m, but the influence of pollution on it should be considered.

d) When the altitude is greater than 2000m, the environment of the actual operation site should be considered and determined according to the design.

3. Maximum wind speed: 35m/s;

4. Ambient relative humidity (at 25°C)

Daily average: 95%;

Monthly average: 90%;

5. Rainfall:

Annual maximum: 2600mm;

Maximum daily: 300mm

6. Thunderstorm day: 65 days/year;

7. Earthquake intensity: 8 degrees;

Eight, horizontal acceleration: 0.25g;

9. Vertical acceleration: 0.125g;

10. Pollution level: Class III (when there is no special regulation);

11. Ice thickness: 10mm (when the wind speed is not more than 15 m/s);