Basic knowledge of lightning protection—term explanation

 Direct lightning strike: Lightning strikes directly on a building, producing electrical, thermal, and mechanical forces.
Lightning induction: During lightning discharge, the electrostatic induction and electromagnetic induction on nearby conductors may cause sparks between metal parts.
Lightning wave intrusion: Due to the effect of lightning on overhead lines or metal pipes, lightning waves may invade the house along these pipelines, endangering personal safety or damaging equipment.
Lightning electromagnetic pulse: The effects caused by direct lightning strikes and nearby lightning strikes as interference sources. Most of them are interference by connecting conductors, such as lightning current or partial lightning current, the potential increase of the device struck by lightning, and magnetic radiation interference.
Equipotential bonding: Connect conductive objects of separate devices with equipotential bonding conductors or surge protectors to reduce the potential difference caused by lightning currents between them.
 Lightning protection system: lightning protection system (LPS): collectively called external and internal lightning protection devices.
External lightning protection system: External lightning protection system: It consists of a lightning receptor, down-conductor and grounding device, which is mainly used to prevent direct lightning protection.
Internal lightning protection system: internal lighting protection system: composed of equipotential bonding system, shared grounding system, shielding system, reasonable wiring system, surge protector, etc., mainly used to reduce and prevent the occurrence of lightning current in the space to be protected Electromagnetic effect.
Surge protective device (SPD): A device that should contain at least one non-linear voltage limiting element to limit transient overvoltages and shunt surge currents. According to the function of the surge protector in the electronic information system, it can be divided into power surge protector, sky-fed surge protector and signal surge protector.
Voltage switching type SPD: Surge protector composed of discharge gap, gas discharge tube, thyristor and triac. It is often called a switch-type surge protector.
Voltage limiting type SPD: Surge protector composed of varistor and suppression diode. It is often called a voltage-limited surge protector.
Lightning protection zone (LPZ): An area where the electromagnetic environment of lightning needs to be specified and controlled.
Synthetic protection against lightning system: Buildings adopt external and internal lightning protection measures.
Electromagnetic lightning electromagnetic impulse (LEMP): Lightning current as an interference source and the electromagnetic field effect produced by the lightning electromagnetic field.
Common earthing system: connect various parts of lightning protection devices, building metal components, low-voltage power distribution protection wires (PE), equipotential bonding tapes, equipment protective ground, shield body ground, anti-static grounding and grounding devices, etc. Grounding system together.
Equipotent bonding (EB): Electrical connection where the potential of exposed conductive parts of equipment and devices is substantially equal.
Equipotent bonding bar (EBB): A metal strip that connects metal devices, foreign conductive objects, power lines, communication lines, and other cables to it to make equipotential bonding with lightning protection devices.
Natural earthing electrode: a collective name for various metal components, metal well pipes, reinforced concrete reinforcements, buried metal pipelines and facilities that also double as ground but are not specifically provided for this purpose .

For more news and events on surge protective device, please pay attention to our official


Feb. 24, 2020