Moving contact is the movable electrode component in medium voltage vacuum interrupters that carries current and separates during circuit interruption.
The moving contact is a critical component within medium voltage vacuum interrupter modules, designed as a movable electrode that maintains electrical continuity during normal operation and separates from the stationary contact to extinguish arcs in vacuum during circuit interruption. It operates within vacuum-sealed chambers at pressures below 10^-4 Pa to prevent dielectric breakdown and ensure reliable arc quenching through metal vapor condensation.
诱因 → 失效模式 → 工程缓解
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The moving contact serves as the movable electrode that separates from the stationary contact to create a vacuum gap for arc interruption, while maintaining current conduction during normal operation.
CuCr alloys provide optimal combination of high conductivity, excellent arc interruption capability, low chopping current, and good mechanical strength while minimizing contact welding and erosion.
Vacuum (below 10^-4 Pa) provides superior dielectric strength, prevents oxidation, enables rapid metal vapor condensation for arc extinction, and eliminates gas contamination that could cause restrikes.
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