As we all know, direct lightning strikes easily attack tall, prominent, isolated buildings. In our modern production and life, many buildings are susceptible to lightning strikes and bring huge losses. So why are some buildings vulnerable to lightning strikes? After doing some lightning protection measures (such as installing a comprehensive surge protector), they are still susceptible to lightning interference.
First, the influence of the building's own conditions
1. Isolated structures or prominent buildings and wet buildings in a group of buildings are vulnerable to lightning strikes;
2. Aerial antennas, corners of transmission lines, etc. are vulnerable to lightning strikes;
3. The parts of the building that are vulnerable to lightning strikes are:
The greater the slope of the building itself, the more susceptible the roof is to lightning strikes. Flat roofs or roofs with a slope of not more than 1/10, eaves, daughter walls, and eaves are the parts that are easily affected by lightning; roofs with slopes of more than 1/10 and less than 1/2 are Lightning-prone parts; roof slopes, roof ridges, and eaves angles are parts that are prone to being struck by lightning. When the slope is about 4/5, the eaves are generally not subject to lightning strikes.
Second, the influence of terrain conditions
In most areas of China, the terrain conditions are complex, and the terrains vulnerable to lightning strikes are:
1. There are more lightning strikes on the east and south slopes of the mountain than on the west and east slopes;
2. The number of lightning strikes in the flat ground in the mountains is more than in the canyon area;
3. Low-lying wet areas near water are susceptible to lightning strikes;
4. Mountain passes and wind vents are vulnerable to lightning strikes.
Third, the impact of geological conditions
Charges accumulate in locations with low soil resistivity and are subject to lightning strikes, while charges in locations with high soil resistivity are less likely to accumulate charges, and the probability of lightning strikes is lower, for example:
1. Large salt fields, river beds, metal deposits, etc. are vulnerable to lightning strikes;
2. At the interface between rock and soil, the soil resistivity is abrupt, and it is also vulnerable to lightning strikes;
3. Groundwater and mountain spring exits are prone to lightning strikes;
4. Dirt hills or hillsides with low soil resistivity are vulnerable to lightning strikes.