The manufacturer of flexible graphite grounding strips reminds you that grounding resistance refers to the resistance encountered when current enters the ground through the grounding body and spreads to the surrounding area. The earth has a certain resistivity, and if there is current flowing through it, different potentials will exist in various parts of the earth. After the current is injected into the ground through the grounding body, it spreads in the form of a current field to all directions. The farther away from the grounding point, the larger the hemispherical scattering area, and the lower the current density in the ground. Therefore, flexible graphite grounding strip manufacturers believe that at a distance of 15-20 meters, the resistance per unit diffusion distance and the current density in the ground are close to zero, and the potential at that point is already zero. The curve U=f (r) in the figure represents the potential distribution on the ground surface (r represents the distance from the lightning current injection point).

According to modern lightning protection perspectives, comprehensive lightning protection is divided into external lightning protection and internal lightning protection. External lightning protection mainly refers to the damage caused by lightning strikes and side lightning strikes to buildings. Building lightning protection is achieved through the protective effects of the building's foundation grounding body, down conductors, lightning rods, lightning nets, lightning strips, lightning grids, voltage equalization rings, equipotential devices, lightning arresters, etc., in order to minimize the electromagnetic effects of lightning strikes on the building as much as possible. At the same time, it provides necessary conditions for the induction lightning protection of internal equipment in the building, avoiding direct and side lightning strikes and protecting the building itself, equipment, and people.

The flexible graphite grounding strip manufacturer reminds you that the design of internal lightning protection should carefully investigate the power supply form of the building, the setting of the electrode, the shielding effect of the house, the laying of pipelines, the shielding situation of electronic equipment, the safe distance between the environment and the external wall, equipotential treatment, and the law of lightning activity, in order to propose corresponding improvement measures and design a reasonable and effective lightning protection induction engineering plan.

Internal lightning protection mainly refers to the protection of equipment against lightning induction and the invasion of lightning waves on the line. The main technical measures taken are shielding, grounding, equipotential treatment, and the installation of shunt voltage limiting devices to control and reduce lightning induction and lightning wave invasion, thereby protecting equipment and personal safety from lightning induction damage. Therefore, the comprehensive lightning protection engineering design is also divided into external lightning protection device design and internal lightning protection device design issues.

Flexible graphite grounding strip manufacturers remind you that external lightning protection engineering design should be based on careful investigation of geographical, geological, soil, meteorological, environmental conditions, lightning activity patterns, and the usage characteristics of protected buildings. Detailed research should be conducted on the form and layout of lightning protection devices for engineering design.