In the specifications of the International Electrotechnical Commission (IEC), lightning protection devices are defined as LightmingPorecionSystem (LPS), literally translated as lightning protection system, which is used to reduce the material damage and personal injury caused by lightning strikes on or near buildings The general term for lightning protection system, consisting of external lightning protection devices and internal lightning protection devices.
The external lightning protection device is a lightning protection system used to protect against direct lightning strikes, as well as lightning current discharge and lightning electromagnetic pulses. External lightning protection devices are usually installed on the exterior walls and underground of buildings to form the first protective barrier for lightning. The external lightning protection device generally consists of an air-termination device, a down conductor, a grounding device, and a shielding body. The external lightning protection device that is completely separated from the protected building is called an independent external lightning protection device. For example, an independent lightning protection tower is often seen, and such an air-termination device is called an independent air-termination device.
The functions of external lightning protection devices are mainly embodied in lightning connection, direct lightning strikes, safe transmission of lightning current to the ground, and lightning current distribution.
Lightning wave intrusion refers to a lightning strike caused by direct lightning protection or lightning induced energy from metal lead-in wires such as gold network pipelines and power lines, communication cables, and radio antennas into the building. The high potential input along the wire is the main reason for the lightning strike of the electrical equipment. Lightning accidents caused by high-potential introduction account for the majority of lightning accidents. Therefore, where there is a metal lead-in device, it is necessary to take precautions against high-potential input.
Why should attention be paid to prevent overvoltage from lightning impulse to avoid indiscriminate installation of surge protectors.
There are many measures that can be used to prevent the occurrence of lightning impulse overvoltage or reduce the amplitude. Therefore, in the design of electrical installations, necessary surge protectors must be used to prevent lightning impulse overvoltage from damaging electrical equipment, and other effective measures must also be adopted to avoid the occurrence of such dangerous overvoltages. In the design, it is obviously wrong to rely solely on fortifications in the middle of the device, install multi-level and a large number of surge protectors to protect sensitive equipment, and ignore other effective measures in electrical installations to avoid or reduce the occurrence of dangerous overvoltages.
DC lightning protectors are only used in various DC power systems, such as DC power distribution panels, DC surge protectors, electrical equipment, DC distribution boxes, electronic information system cabinets, and the output terminals of secondary power equipment.
The DC1000V DC lightning protection device adopts temperature control circuit breaker technology and built-in over-current protection circuit to completely avoid the fire risk caused by the self-heating of the surge protector; and it uses well-known components and is manufactured with advanced production technology; large current capacity, The residual voltage is low; and the DC lightning protector has its own remote alarm dry contact; the working status and failure status are clear and intuitive; the DC1000V DC lightning protector is easy to install and simple to maintain; the craftsmanship is exquisite and can be used in acid, alkali, dust, and salt spray Long-term work in harsh environments such as humidity and humidity.
Grounding is an extremely important and complex issue in LPS. The pros and cons of grounding devices are not only related to grounding resistance and soil resistivity, but also related to grounding methods: in addition, various grounding relationships must be handled correctly, and the grounding of microelectronic systems also needs to consider the issue of anti-electromagnetic interference. The grounding device should be designed according to the grounding purpose instead of the grounding resistance value. The normal operation of the system is a regular requirement, and the safety protection is to deal with unexpected accidents. Both need to be considered reasonably.