Vacuum Interrupter Power Transmission Device for Electrode Impact Reduction
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Solution Overview
Problem
Conventional vacuum interrupters experience high impact between movable and fixed electrodes during closing operations, leading to potential damage and prolonged pre-arc times due to rapid closing speeds, which negatively affect performance.
Innovation Solution
A power transmission device with a speed-variable closing apparatus, utilizing a driving link, driven link, connection links, cams, and cam guides to control the interval between the links, allowing for deceleration of the movable electrode during closing, thereby reducing impact and pre-arc time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the closing speed is made slow to reduce impact, then impact amount is reduced, but closing time becomes long and pre-arc duration increases
Solution Approach 1:
The closing operation is divided into distinct phases with different speed characteristics: a rapid closing phase to quickly close the contacts, followed by a deceleration phase to reduce impact. This periodic variation in closing speed allows the system to achieve both rapid response and low impact, resolving the contradiction between closing time and impact amount.
Solution Approach 2:
The closing speed is made dynamic rather than constant. The system transitions from high speed to low speed during the closing operation, allowing rapid initial closure followed by controlled deceleration. This dynamic speed control enables the system to minimize both closing time and impact amount simultaneously.
2Force
If the entire closing speed is made slow, then impact amount is reduced, but pre-arc occurring time is prolonged
Solution Approach 1:
The closing operation uses periodic action with different speed phases. The initial rapid closing phase quickly moves the movable electrode through the pre-arc region, minimizing pre-arc duration. The deceleration phase occurs after the electrode has already closed, so it does not extend pre-arc duration while still reducing impact amount.
Solution Approach 2:
The system rushes through the pre-arc region at high speed to minimize the time the pre-arc condition exists. By maintaining high closing speed during the critical pre-arc phase and only decelerating after closure, the system minimizes pre-arc duration while still achieving low impact through subsequent deceleration.
Data Source
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Figure 3
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AI summary
Disclosed are a power transmission device for a vacuum interrupter, and a vacuum breaker having the same. The device includes: a driving link 10 coupled to an adjuster; a driven link 20 coupled to a movable electrode 5 of a vacuum interrupter; connection links 31, 35 configured to connect the driving link 10 and the driven link 20 with each other, and coupled to the driving link 10 and the driven link 20 such that an interval between the driving link and the driven link is varied; cams 41, 45 coupled to the connection links 31, 35 in a perpendicular direction; and cam guides 51, 55 having guide recesses 52, 53, 56, 57 for slidably coupling the cams 41, 45, and configured to guide the interval between the driving link 10 and the driven link 20 to be changed. Under such configurations, when the present state of the vacuum interrupter is converted into a closed state, an impact amount between the movable electrode and the fixed electrode can be reduced. This can reduce the entire time taken for the movable electrode to pass through a pre-arc region when the movable electrode is closed, thereby preventing damage of the electrodes.