Same-time-sequence multi-pulse lightning protection box

Abstract

A same-time-sequence multi-pulse lightning protection box comprises a lightning protection module, a sampling circuit, a detection circuit, and a display panel connected in sequence. The sampling circuit comprises an EMC strong electromagnetism suppression circuit, a signal acquisition circuit, and a strong electromagnetism isolation and suppression circuit. When a low-voltage power supply circuit is impacted by a lightning electromagnetic pulse, a lightning overvoltage signal is generated on the low-voltage power supply circuit and is applied to the lightning protection module. The lightning protection module transmits one path of the lightning overvoltage signal to the EMC strong electromagnetism suppression circuit, and another path of the lightning overvoltage signal is connected to a PE end, so that lightning is conducted into the ground. The EMC strong electromagnetism suppression circuit limits the rising gradient and amplitude of the generated lightning overvoltage signal and transmits the processed signal to the signal acquisition circuit. The signal acquisition circuit acquires the signal and transmits the acquired signal to the strong electromagnetism isolation and suppression circuit. The strong electromagnetism isolation and suppression circuit isolates the signal, and transmits the processed signal to the detection circuit and the display circuit panel, so that man-machine information exchange is implemented.

Description

technical field [0001] The invention relates to the technical field of lightning protection, in particular to a simultaneous multi-pulse lightning protection box. Background technique [0002] So far, surge protectors (SPD for short, English abbreviation of Surge Protective Device) produced in various countries around the world are developed and produced in accordance with the technical standards of IEC / TC61643-11 and adopted by the lightning high voltage laboratory with 10 / 350μs or 8 / 20μs single-pulse shock wave for inspection. Such as Japan Zhaodian Co., Ltd. and my country Beijing and Shanghai Lightning Protection Device Testing Centers introduced Swiss The SSGA impulse current generator of HAEFELY, the output current waveform is 10 / 350μs; the maximum output The output current is 200KA. [0003] However, a lightning strike usually includes multiple pulses during a real lightning discharge. In June 2008, at the 29th International Lightning Protection Conference in ...

AI Technical Summary

Problems solved by technology

The maximum current flowing through the SPD is 1.64KA, causing damage to the SPD with a nominal current of 20kA

[0004] Both scientific experiments and lightning protection practices have shown that the method of testing SPD with a single pulse in the lightning high-voltage laboratory is inconsistent with the fact that multiple pulses are struck by real lightning at one time. The force is far from its nominal value, which often leads to SPD overheating, explosion and fire, causing fire accidents

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