GB/T 42393-2023 in English

1. Background and significance of standard formulation

GB/T 42393-2023 "Method for drawing regional wind hazard distribution map of power grid under high-altitude micro-topography and micro-meteorological conditions" is an important standard for the safe operation of power grids in high-altitude areas. With the global climate change and the growth of energy demand, transmission lines in high-altitude areas face greater risks of wind damage. The formulation of this standard aims to provide a scientific basis for the design, operation and maintenance of power systems and ensure the safety of power grids under complex terrain and meteorological conditions.

2. Wind damage classification and drawing method

3. Analysis of key technical points

Principles for wind hazard classification: Based on the design wind speed, monitoring data and micro-topography conditions, wind hazards are divided into four levels (I to IV). Pay special attention to the increase of wind hazard risk in crosswind areas by one level.

4. Influence of micro-topography and micro-meteorology

5. Process of drawing a regional wind hazard distribution map

1. Data collection and processing:Including weather station data, terrain data and power grid operation records.
2. Spatial interpolation method selection:By comparing the inverse distance weighted interpolation method, radial basis function interpolation method and Kriging interpolation method, select the method with the smallest error (such as radial basis function interpolation method).
3. Adjustment of wind damage level:Combining micro-topography areas, wind damage accident points and monitoring data, the wind damage level is locally improved.
4. Layer overlay and identification:Mark key areas on the electronic map and attach version information (such as YN-2018).

6. Implementation recommendations

To ensure the effective implementation of the standard, it is recommended that:

• Establish a regional meteorological monitoring network and update the wind damage distribution map in real time;
• Strengthen line design and maintenance in micro-topography areas;
• Carry out risk assessment and hidden danger inspection regularly.