Differences between primary and secondary lightning arresters
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. Below, the editor will introduce to you the "Classification Standards for Lightning Protection: Differences between Level 1 Lightning Protection Devices and Level 2 Lightning Protection Devices"
1, Lightning protection level classification standard
1. Level 1 lightning protection: Buildings that manufacture, use, or store a large amount of explosive materials such as explosives, gunpowder, detonating agents, and artificial products may cause significant damage and personal injury due to electric sparks. Buildings with explosive hazardous environments in Zone 0 or Zone 10, as well as those with explosive hazardous environments in Zone 1, may cause significant damage and personal injury due to electric sparks causing explosions.
2. Second level lightning protection: buildings protected by national key cultural relics, national level halls, office buildings, large exhibition and exhibition buildings, large railway stations, state hotels, national archives, important water supply pump rooms in large cities, and other particularly important buildings.
3. Level 3 lightning protection: Buildings and archives under provincial key cultural relics protection, department and provincial office buildings with an expected lightning strike frequency greater than or equal to 0.012/a and less than or equal to 0.06/a, as well as important or densely populated public buildings, residential and office buildings with an expected lightning strike frequency greater than or equal to 0.06/a and less than or equal to 0.3/a, and other general civil buildings, General industrial buildings with an expected number of lightning strikes greater than or equal to 0.06/a.
2, Differences between primary and secondary lightning arresters
1. The current carrying capacity of the first and second stages is different. Generally, the overcurrent capacity of the first stage is much greater than that of the second stage. The first stage is mainly used for leakage, and the second stage is mainly used for voltage limiting. Those who have conducted impact tests must know that after the first stage of leakage, the residual voltage will decrease significantly after the second stage of voltage limiting.
The reaction time of the first and second stages is different, and generally speaking, the switch type of the first stage SPD is slower than the voltage limiting type.
3. The protection level of Level 1 and Level 2 is also different. Level 1 SPD can protect against 100KA lightning waves, while Level 2 SPD can only protect against 40KA.
4. The installation positions of the first and second levels are also different. Generally speaking, in a house, the first level is installed in the distribution cabinet of the three-phase electrical incoming line, and then the second level is installed on each floor.
