The first-level surge protector refers to the first-level surge protection product for the main distribution cabinet, which needs to withstand the T1 lightning surge test.
The first level of surge protector is designed to prevent surge voltage from being conducted directly from the LPZ0 region into the LPZ1 region, limiting the surge voltage from tens of thousands to hundreds of thousands of volts to 2500-3000V.
Common first-class surge protectors are available in 12.5kA, 15kA, 25kA, and 50kA. According to the national standard, the first-level surge protector parameters must meet Iimp≥12.5kA, and Up≤2.5kV.
Since the energy of lightning strikes is very large, it is necessary to gradually discharge the lightning strike energy to the earth by means of grading discharge. The first-level surge protector can bleed for direct lightning current, or discharge the huge energy transmitted when the power transmission line is subjected to direct lightning strike. For places where direct lightning strikes may occur, CLASS-I lightning protection must be performed. . The second-stage lightning arrester is a protective device for the residual voltage of the front-end lightning protection device and the lightning-inducing lightning strike in the area. When there is a large lightning energy absorption in the front stage, there is still a part of the equipment or the third-level lightning protection device. It is quite a huge amount of energy that will be transmitted and requires a second-stage arrester for further absorption. At the same time, the transmission line of the first-stage lightning arrester will also induce the lightning pulse electromagnetic radiation LEMP. When the line is long enough, the energy of the induced lightning becomes large enough, and the second-level lightning protection device is needed to further discharge the lightning energy. The third-stage lightning arrester protects the LEMP and residual lightning energy through the second-stage lightning arrester.
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