Universal Vacuum Interrupter Actuating Arm Arc Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Air disconnect switches with universal vacuum interrupters experience arcing during disconnection and reconnection phases, which can cause damage and safety hazards due to the relative movement of the actuating arm and roller in the primary circuit.
Innovation Solution
A universal vacuum interrupter with a rotatable actuating arm comprising two rods that are biased towards each other, ensuring continuous engagement with the corresponding contact of the main blade, thereby preventing arcing by maintaining contact throughout the disconnection and reconnection phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single rod actuating arm is used, then the device complexity is reduced, but arcing occurs during disconnection and reconnection phases causing damage and safety hazards
Solution Approach 1:
The actuating arm is segmented into two separate rods instead of a single rod, allowing each rod to independently engage with the roller contact. This segmentation enables continuous electrical contact during disconnection and reconnection phases, preventing arcing while maintaining operational reliability.
2Reliability
If two rods are used in the actuating arm, then arcing is prevented by maintaining continuous engagement, but the device complexity increases
Solution Approach 1:
The two rods are merged into a single actuating arm assembly that rotates together on a common shaft. This combining approach maintains continuous engagement with the roller contact through coordinated movement of both rods, preventing arcing while managing structural complexity through unified design.
3Reliability
If the actuating arm maintains continuous engagement with the roller, then arcing is eliminated, but the weight of the actuating arm increases
Solution Approach 1:
The material parameter of the actuating arm is changed from traditional heavy materials to aluminum, reducing weight while maintaining the structural integrity needed for continuous engagement. The two-rod configuration distributes mechanical loads, allowing for optimized material usage and weight reduction.
Data Source
Figure 1
Figure 2~3
AI summary
The invention relates to a universal vacuum interrupter (UVI) (30) for an air disconnect switch (100) comprising a rotatable actuating arm (21) arranged for engagement by a corresponding contact (16), such as a roller, attached to the main blade (12) of an air disconnect switch (100). In particular, the actuating arm (21) comprises two rods (22) extending next to each other and adapted for receiving the corresponding contact (16) of the main blade (12) between them. The two rods (22) are movable to alter the distance between them but are biased together by biasing means (24), e.g. helical springs. As the corresponding contact (16) of a main blade (12) will be in engagement with both rods (22) during disconnection and reconnection of the air disconnect switch (100), arcing is thereby prevented. Preferably, the two rods (22) of the UVI (30) are made of aluminium.