Common problems of lightning protection grounding, lightning arrester manufacturers
The lightning protection grounding down conductor uses two 16 or more main bars in the concrete column and four 16 main bars of the concrete cast-in-place pile as the down conductor, and the jumper uses round steel ≥ 12mm. The upper end of the down-lead wire is welded to the lightning protection belt, and the lower end is welded to the grounding device. The distance between two adjacent down conductors shall not be greater than 18 meters. The grounding device is a grounding grid formed by welding the main reinforcement in the foundation pile and the foundation floor. The grounding trunk lines of all equipment rooms, electrical shafts, and elevator shafts, as well as the galvanized flat steel with artificial grounding electrodes, grounding terminal boards, etc., and the grounding grid are reliable welding. Next, let’s analyze the common problems of landmine protection for everyone!
Lightning protection grounding is not only a systematic project but also a dangerous project. Direct lightning strikes have direct damage to the human body, while induced lightning will cause a huge impact on the equipment and damage the equipment in the equipment room. Therefore, it is not only good to understand the basic knowledge of lightning protection and grounding. The protective equipment room can better protect the personal safety of employees.
1. The use type and function of the arrester:
Commonly used lightning arresters are valve type, exhaust type, zinc oxide and so on. The lightning arrester is used to protect the lightning overvoltage from intruding into the substation or other buildings along the line so as not to endanger the insulation of the protected object. Nowadays, zinc oxide surge arresters are often used outdoors in the power distribution, and valve arresters are generally used indoors. (Lightning arrester manufacturer)
2. The concept of safe current:
The safe current refers to the maximum escape current of the human body after an electric shock. The safety current stipulated in our country is 30 mA. The safety current is related to factors such as the time of electric shock, the nature of the current, the path of the current, and the weight and health status.
3. Safe voltage concept:
Safety zone voltage refers to the voltage that does not cause direct death or disability. The safety extra-low voltage specified in our country is 36 volts.
4. The concept of land:
Electrical ground refers to a place where the potential is zero; this ground generally refers to a place about 20 meters away from the ground fault point.
5. The concept of working grounding and protective grounding:
Grounding to ensure that the power system and equipment meet the requirements of normal operation is called working grounding. The grounding to protect personal safety from contact with electricity is called protective grounding. For example: the neutral point of the transformer is grounded, and the grounding of the lightning arrester and the lightning arrester is the working ground. The grounding of the secondary side terminal of the transformer and the grounding of the equipment shell are the protective grounding.
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