Test method and application of surge protector

According to the type of test, SPD can be divided into three categories:
Class I tests (Class T1) : Tests performed at a peak value of 8/20 impulse current and 1.2/50 impulse                                               voltage equal to the impulse discharge current Iimp.
Class II tests (Class T2) : Tests performed at nominal discharge current In and 1.2/50 impulse voltage.

Class III tests (Class T3) : Tests performed on a composite wave generator with a 1.2/50 voltage                                                      waveform and an 8/20 current waveform.

The fundamental difference between different categories of surge protectors is that the test waveform is not the same, T1 class refers to the surge protector that conforms to the class I test grade, and can withstand the 10/350μs impact waveform discharge current of the surge protector, generally installed in the total line inlet cabinet as the first level of lightning protection. T2 level refers to the surge protector that meets the Class II test level and can withstand the 8/20μs impact waveform discharge current, which is generally installed in the distribution cabinet as the second and third level lightning protection. Class T3 refers to the surge protector that meets the class III test grade and can withstand the impact of the 1.2/50 voltage waveform and 8/20 current waveform of the composite wave generator. The protection ability of T3 type surge protector is relatively low, mainly used for the protection of sensitive electronic equipment and systems, it can effectively resist low-power surge current and surge voltage, and provide basic protection for the input port of the device. T3 type surge protectors are often used to protect terminal equipment, sensors, controllers, etc.

When choosing the type of surge protection device, we should consider both economic issues and model adaptability. By choosing the right type of surge protector and reasonably configuring its performance parameters, we can achieve effective protection of lightning and avoid serious safety accidents and property losses.