Multi-stage series gap arrester for lightning protection of power electronic devices

Abstract

The invention discloses a multi-stage series gap arrester for lightning protection of power electronic devices. The multi-stage series gap arrester for lightning protection of power electronic devicescomprises a high-voltage end, a ground end, N+1 zinc oxide arresters (ZnO), N series connection partial voltage inductors, N-1 loop partial voltage inductors and N equal-distance discharge gaps; thezinc oxide arresters, the series connection partial voltage inductors, the loop partial voltage inductors and the equal-distance discharge gaps form a first-stage discharge gap loop to an N-stage discharge gap loop, which are connected in series. The multi-stage series gap arrester is capable of withstanding relatively high direct current operating voltage, and has the characteristics of low residual voltage, long service life and high operational reliability.

Description

technical field [0001] The invention relates to the technical field of power equipment, in particular to a multi-stage series gap arrester used for lightning protection of power electronic devices. Background technique [0002] A power electronic device is a device composed of various power electronic circuits for the conversion and control of high-power electric energy. Due to the low insulation strength and poor overvoltage and overcurrent tolerance of power electronic devices, it is easy to cause work failure or permanent damage after being damaged by lightning. Therefore, the residual voltage of the new arrester is required to be low. For the protection of lines and equipment in the power system, because they have the ability to resist instantaneous impact and can withstand the high residual voltage impact of lightning arresters, lightning arresters are often used for protection. Therefore, in order to ensure the safe and reliable operation of power electronic devices, ...

AI Technical Summary

Problems solved by technology

For metal oxide arresters without gaps, which work under high working voltage for a long time, they are prone to damage or explosion due to limited current capacity; for metal oxide arresters in series with a single air gap, although there is a single gap isolation, the arrester The main body only works when lightning strikes, prolonging the service life of the arrester, but the discharge dispersion of a single air gap is large, and the reliability of the arrester cannot be guaranteed

Although these two arrester protection methods are often used in lightning protection of high-voltage devices, the residual voltage of the two is relatively high, and it is impossible to protect power electronic devices against lightning.

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