As one of the natural disasters, lightning disasters cause countless casualties and property losses worldwide every year. With the widespread application of electronic and microelectronic integrated equipment, the damage to systems and equipment caused by lightning overvoltage and lightning electromagnetic pulses is increasing. Therefore, it is very important to solve the problem of lightning disaster protection in buildings and electronic information systems as soon as possible.
With the increasingly strict requirements for lightning protection in related equipment, installing surge protection devices (SPDs) to suppress surges and instantaneous overvoltage on the line, and discharging overcurrent on the line has become one of the important links in modern lightning protection technology.
We take lightning protection measures based on the characteristics of lightning, including external and internal lightning protection. External lightning protection mainly consists of lightning arresters (lightning rods, lightning grids, lightning strips, lightning conductors), down conductors, and grounding devices. Their main function is to ensure that the building itself is protected from direct lightning strikes, and to discharge lightning that may hit the building into the ground through lightning rods (strips, grids, lines), down conductors, and other means. Internal lightning protection includes measures for lightning induction, line surge, ground potential counterattack, lightning wave intrusion, and electromagnetic and electrostatic induction. The basic method is to use equipotential bonding, including direct connection and indirect connection through SPD, to form a conditional equipotential body between the metal body, equipment lines and the earth, and to discharge the lightning current or surge current induced by lightning strikes and other surges into the earth, thereby protecting the safety of personnel and equipment inside the building.
The characteristic of lightning is that the voltage rises very quickly (10 μ Within s, the peak voltage is high (tens of thousands to millions of volts), the current is large (tens to hundreds of kiloamperes), the maintenance time is short (tens to hundreds of microseconds), the transmission speed is fast (propagating at the speed of light), the energy is very huge, and it is a type of surge voltage with strong destructive power.
Surge protector, also known as lightning arrester, is an electronic device that provides safety protection for various electronic devices, instruments, and communication lines. When a surge current or voltage suddenly occurs in an electrical circuit or communication line due to external interference, the surge protector can conduct shunt in a very short time, thereby avoiding damage to other equipment in the circuit caused by the surge.
Surge protector, suitable for protecting indirect lightning, direct lightning impact, or other transient overvoltage surges in power supply systems with AC 50/60Hz and rated voltage of 220V/380V. It is suitable for the requirements of surge protection in residential, tertiary, and industrial fields.
SPD is an indispensable device in the lightning protection of electronic devices. Its function is to limit the instantaneous overvoltage that enters power lines and signal transmission lines within the voltage range that the equipment or system can withstand, or to discharge strong lightning currents into the ground, protecting the protected equipment or system from impact.
