Investigation on Arc Asynchronous Characteristics of the Double Bridge-Type Contacts in DC Relays
IEEE Transactions on Plasma Science(2023)
摘要
The asynchrony of the multi-break dc relay has an important influence on its arcing characteristics. Through the experimental test platform, the arc characteristics of the single bridge-type contact and the double bridge-type contacts are compared. Arc images are acquired through high-speed photography. On the basis of asynchronous action, the influence of action speed and overtravel difference on arcing characteristics is analyzed. A multi-breakpoint asynchronous arc model is established to study the nonlinear relationship between overtravel difference and arc duration. The distribution characteristics of the double-bridge arc are analyzed. Experiments and simulations show that the double bridge-type contacts have better arc-extinguishing characteristics. Increasing breaking speed is conducive to reducing arc energy difference between fractures. When the overtravel difference is small, the bridge
$B$
(bridge with larger overtravel) arc can enter the diffusion state, and the arc voltage of bridge
$B$
is higher. Reducing the overtravel difference can effectively reduce the arc duration.
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关键词
Arc discharge,bridge-type contacts,magnetohydrodynamic (MHD),multi-break relay,switch arc
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