A lightning multi-pulse protection device

Abstract

The present invention relates to a lightning multi-pulse protection device. The device comprises a metal sheet, a first relay switch K1, a second relay switch K2 and a third relay switch K3. One powerend of the first relay switch K1 and one power end of the second relay switch K2 are connected at a node E, the node E is connected with one end of the metal sheet, the other power end of the first relay switch K1 is connected with a contact point A, the other power end of the second relay switch K2 is connected with a contact point B, one power end of the third relay switch K3 is connected withthe other end of the metal sheet, the other power end of the third relay switch K3 is connected with a contact point C, and coil ends of the first relay switch K1, the second relay switch K2 and the third relay switch K3 are taken as signal ends to connect output signal end of a signal monitoring device. When a device receives early warning signals, switching motion in a protection device cut offa rear-end load and an outside power supply prior to generation of subsequent return stroke so as to reach a purpose of protecting multiple pulses generated by the subsequent return stroke.

Description

technical field [0001] The invention relates to the field of lightning protection, in particular to a lightning multi-pulse protection device. Background technique [0002] At present, in terms of the overall status of lightning protection products at home and abroad, widely used surge protectors (SPD) and other lightning protection products are based on the understanding of single-pulse lightning, and IEC also tests the performance of surge protectors. Experimental waveforms are defined as 8 / 20μs and 10 / 350μs waveforms. Lightning high voltage laboratories around the world use a single waveform to test SPD according to IEC61643-2011. Therefore, the current SPD is designed for the protection of a single surge current pulse from the beginning, and it can obtain a good protection effect for the single pulse situation, but it does not give full consideration to the multi-pulse situation, which leads to the current The SPD needs to be improved urgently in the protection of mult...

AI Technical Summary

Problems solved by technology

Therefore, the current SPD is designed for the protection of a single surge current pulse from the beginning, and it can obtain a good protection effect for the single pulse situation, but it does not give full consideration to the multi-pulse situation, which leads to the current The SPD needs to be improved urgently in the protection of multi-pulse

[0003] At present, domestic and foreign statistical observation results show that more than 70% of cloud-ground lightning strikes have multiple strikes, with an average of about 4 strikes. The first strike is called the first strike, and subsequent strikes are collectively called subsequent strikes. Protection against multiple pulse , this type of SPD is difficult to achieve the same expected effect as the single pulse

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