Arnd Ehrhardt - Requirements on fuses in the trigger circuits of spark-gap-based arresters

Arnd Ehrhardt (1), Stefanie Schreiter (1), Michael Rock (2)

(1) DEHN + SÖHNE GmbH + Co.KG., Hans-Dehn-Straße 1, D-92318 Neumarkt,,
(2) Technische Universität Ilmenau, Gustav-Kirchhoff-Straße 1, D-98693 Ilmenau,

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Electronic trigger circuits are nowadays used in modern lightning current arresters. Due to their mode of operation, considerable impulse currents may occur in these trigger circuits. As a result, the components of the trigger circuit could be overloaded. This article describes a specially designed surge-proof miniature fuse that protects the trigger circuit in a lightning current arrester. The special application-specific requirements on this fuse will be pointed out in detail. The miniature fuse described in this article, which is mounted on a printed circuit board, is adapted to the load capacity of the trigger circuit. The fuse was designed with a high impulse current carrying capability and has a long-time ageing resistance and a high extinguishing capability for line-frequency currents.

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