Hunan Weipuxun Communication Technology Co., Ltd. recommends the following points:
1. Power distribution system
First of all, you must figure out your own power distribution system, is it TT, TN or IT system? Because the power distribution system is determined, we can determine single-phase, three-phase, wiring mode, etc., so as to choose suitable lightning protection products. Most power distribution systems in my country are TN-S.
The main material in lightning protection products is varistor. The quality of the material and the level of craftsmanship have a direct impact on whether the product can produce the expected protection when it is struck by lightning, so you must know the manufacturer when choosing a lightning protection device. source of the varistor. The materials selected by Hunan Weipuxun Communication Technology are industry-leading and imported components.
3. Important parameters
Nominal voltage Un: The rated voltage of the protected system is consistent. In the information technology system, this parameter indicates the type of protector that should be selected, and it marks the effective value of the AC or DC voltage.
The maximum continuous operating voltage Uc: the maximum voltage effective value that can be applied to the designated end of the protector for a long time without causing changes in the characteristics of the protector and activating the protection element.
Nominal discharge current In: When a standard lightning wave with a waveform of 8/20s is applied to the protector for 10 times, the maximum peak value of the surge current that the protector can withstand.
Maximum discharge current Imax: When a standard lightning wave with a waveform of 8/20s is applied to the protector once, the maximum peak value of the surge current that the protector can withstand.
Voltage protection level Up: the maximum value of the protector in the following tests: the flashover voltage with a slope of 1KV/s; the residual voltage of the rated discharge current.
These parameters must be confirmed when selecting a model.
4. Installation location
According to the principle of three-level lightning protection, the protection measures required for power supply and equipment are divided into three levels. Install the first-level lightning protection device in the general distribution cabinet, choose a power supply lightning protection device with a relatively large flow capacity (Imax80KA~160KA depending on the situation), and then install the second-level power supply lightning protection at the subordinate regional distribution box device (Imax40KA or so), and finally install a third-level power surge protector (Imax10KA-40KA) at the front of the equipment.
5. Test report
Lightning protection products shall comply with the use requirements stipulated by the meteorological authority under the State Council. Lightning protection products shall be tested by a testing institution authorized by the meteorological authority under the State Council, and may be put into use only after passing the test and meeting relevant requirements. To apply for the lightning protection product testing agency authorized by the meteorological authority of the State Council, it shall pass the metrology certification and obtain qualification accreditation in accordance with the relevant state regulations.