Surge protector classification of DC lightning protector
May 23, 2022
In the specification of the International Electrotechnical Commission (IEC), the lightning protection device is defined as Lightming Porecion System (LPS), which is literally translated as lightning protection system, which is used to reduce the material damage and personal casualties caused by lightning strikes on or near buildings. The general term for lightning protection systems, 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 direct impact of lightning electromagnetic pulses. External lightning protection devices are usually installed on the outer walls and underground of buildings to form the first protective barrier against lightning. The external lightning protection device is generally composed of a lightning receptor, a downconductor, 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, the often seen independent lightning protection tower, and such an air-termination device is called an independent air-termination device.
The functions of the external lightning protection device are mainly reflected in the lightning connection, guiding the direct lightning strike, safely transmitting the lightning current to the ground, and diverting the lightning current.
Lightning wave intrusion
Lightning wave intrusion refers to lightning strikes caused by direct lightning strikes by lightning arresters or lightning induced energy introduced into buildings from gold network pipes, power lines, communication cables, radio antennas and other metal lead-in wires. The input of high potential along the wire is the main reason why the electrical equipment is struck by lightning. Lightning strike accidents caused by the introduction of high potential account for the majority of lightning strike accidents. Therefore, wherever there are metal lead-in devices, precautions must be taken for high-potential input.
Why should we pay attention to avoid installing surge protectors indiscriminately in the prevention of lightning impulse overvoltage?
There are many measures that can be used to prevent the occurrence or reduction of lightning impulse overvoltage. Therefore, in the design of electrical installations, the necessary surge protector should be used to prevent lightning impulse overvoltage from damaging electrical equipment, and other effective measures should be adopted to avoid the occurrence of such dangerous overvoltage. In the design, it is obviously wrong to simply rely on fortification in the middle of the device, install multiple layers and a large number of surge protectors to protect sensitive equipment, and ignore other effective measures in electrical devices to avoid or reduce the occurrence of dangerous overvoltages.
DC lightning protection devices are only used in various DC power supply systems, such as DC power distribution panels, DC power supply surge protector electrical equipment, DC power distribution boxes, electronic information system cabinets, output terminals of secondary power supply equipment, etc.
The DC1000V DC lightning protection device adopts temperature-controlled circuit breaker technology and built-in overcurrent protection circuit to completely avoid the occurrence of fire hazards caused by the self-heating of the surge protector; well-known components are selected and manufactured with advanced production technology; large current capacity, The residual voltage is low; and the DC lightning protection device has its own remote alarm dry contact; the working status and failure status are clear and intuitive; the DC1000V DC lightning protection device is easy to install and maintain; And long-term work in harsh environments such as humidity.
Grounding is an extremely important and complex issue in LPS. The pros and cons of the grounding device are not only related to the grounding resistance value and soil resistivity, but also to the grounding method. In addition, the relationship between various groundings must be properly handled. The grounding of the microelectronic system also needs to consider the problem of preventing electromagnetic interference. The grounding device should be designed according to the grounding purpose rather than the grounding resistance value. The normal operation of the system is a regular requirement, while the safety protection is to deal with unexpected events. The two need to be reasonably balanced.