What does the percentage of voltage decrease around a crane after it strikes a power line depend on?

The percentage of voltage decrease around a crane after it strikes a power line is primarily influenced by soil resistivity. Soil resistivity refers to how well the soil can conduct electricity, which plays a crucial role in determining how electrical currents dissipate into the ground. When a crane makes contact with a power line, the electrical current can travel through the air and then into the ground. The effectiveness of this dissipation is largely dependent on the conductive properties of the soil.

In areas with low resistivity, such as wet, sandy, or rocky soils, electricity can spread out more easily, leading to a significant voltage decrease. Conversely, in soils with high resistivity, such as dry or clay-like soils, the current may not dissipate as effectively, which could result in a lesser percentage of voltage decrease around the crane. Thus, understanding and evaluating soil resistivity is critical for anticipating the safety risks associated with such incidents.