Why is it always necessary to use T1 power surge arrester and T2 level T3 level What is the difference

WPX is a comprehensive company integrating production and sales of lightning protection devices and surge protection devices.

The company mainly R & D and production of the main lightning protection products include: power lightning protection device, signal lightning protection device, multifunctional lightning protection device, customized lightning protection products and other four product systems, can meet the full range of user system equipment lightning protection needs.

According to the definition of GB18802.1 standard: according to the application environment and test requirements, it can be divided into Class I test, Class II test and Class III test, which are identified as "T1", "T2" and "T3". The test waveforms are In (8/20μs), 1.2/50μs impulse voltage and Iimp(10/350μs) maximum impulse current, respectively. In (8/20μs), 1.2/50μs impulse voltage and maximum discharge current Imax(8/20μs); Combined waves of 1.2/50μs. The energy difference between T1 and T2 is huge, the former is directly hit, the latter is affected by the shock wave.

From the perspective of products, as for T1, T2 and T3 lightning protection devices can not be used to distinguish between good and bad with "advantages" and "disadvantages", but these lightning protection devices are different. These can be compared according to the environment and energy used. T1 Application environment LPZ0A or the interface area between LPZ0B and LPZ1 is used for Class I protection in areas with high lightning frequency and high lightning current intensity. Building lightning protection code requires Class I buildings to install T1 SPD requirements should not be less than 12.5kA (10/350μs)), local laws and regulations will be more stringent requirements, T1 SPD impulse current will be larger, and add T2 SPD should not be less than 60kA (8/20μs). SPD installation in Grade II and III buildings is different.

From the perspective of products, as for T1, T2 and T3 lightning protection devices can not be used to distinguish between good and bad with "advantages" and "disadvantages", but these lightning protection devices are different. These can be compared according to the environment and energy used. T1 Application environment LPZ0A or the interface area between LPZ0B and LPZ1 is used for Class I protection in areas with high lightning frequency and high lightning current intensity. Building lightning protection code requires Class I buildings to install T1 SPD requirements should not be less than 12.5kA (10/350μs)), local laws and regulations will be more stringent requirements, T1 SPD impulse current will be larger, and add T2 SPD should not be less than 60kA (8/20μs). SPD installation in Grade II and III buildings is different.

From the way the lightning protection energy is gradually weakened and the insulation voltage resistance of the protection equipment is required to be configured, Class T2 and T3 should be installed for its fine protection. For example, the T2 and T3 SPD of WPX can achieve low residual pressure and more effectively protect the equipment. The purpose of these lightning arresters is different, and the appropriate lightning arrester can be configured according to the application.