Surge Protector Lightning Characteristics

surge protective device Includes external lightning protection and internal lightning protection. External lightning protection is mainly based on lightning arresters (lightning rods, lightning nets, lightning strips, lightning conductors), down conductors, and grounding devices. Its main function is to ensure that the building body is protected from direct lightning strikes. surge protector The lightning that may hit the building is discharged into the ground through lightning rods (strips, nets, wires), down conductors, etc. Internal lightning protection includes measures to prevent lightning induction, line surges, ground potential counterattacks, lightning wave invasion, and electromagnetic and electrostatic induction. The basic method is to use equipotential bonding, including direct connection and indirect connection through SPD, so that the metal body, equipment line and the ground form a conditional equipotential body, surge protection device The internal facility shunt and induced lightning current or surge current caused by lightning strikes and other surges are discharged into the ground, thereby protecting the safety of personnel and equipment in the building.
The characteristics of lightning are that the voltage rises very quickly (within 10μs), the peak voltage is high (tens of thousands to millions of volts), the current is large (tens to hundreds of kiloamperes), the duration is short (tens to hundreds of microseconds), the transmission speed is fast (propagates at the speed of light), and the energy is very huge. It is the most destructive type of surge voltage.