Multi-Contact Lightning Arrester Switch for Stable Shaft Contact
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Solution Overview
Problem
Existing disconnect switches for lightning arresters suffer from incomplete contact during high voltage surges, leading to damage and wear due to point contact and lack of verticality, resulting in inefficient surge voltage discharge and reduced lifespan.
Innovation Solution
A multi-contact disconnect switch with a sawtooth-shaped support structure and guide unit maintains even contact with the contact shaft, ensuring a constant distance and increased fixing force, reducing wear and deformation during operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single contact point structure is used, then the device complexity is reduced, but the contact area decreases leading to increased contact resistance and wear
Solution Approach 1:
The contact structure is segmented into multiple contact points (first contact point, second contact point, third contact point) distributed around the contact shaft. This segmentation increases the total contact area and distributes the mechanical and electrical load, reducing contact resistance and wear while maintaining operational reliability.
2Ease of operation
If the contact shaft moves freely without guidance, then the ease of operation is improved, but the verticality decreases causing the shaft to be driven to one side and worn out quickly
Solution Approach 1:
A guide unit is introduced as an intermediary component between the contact shaft and the housing. This guide unit constrains the shaft's movement path, maintaining its verticality during operation while still allowing smooth movement. The guide unit acts as a mediator that provides directional guidance without preventing necessary motion.
3Manufacturing precision
If the contact area is reduced to a point contact, then the manufacturing precision requirements are reduced, but the surge voltage discharge efficiency decreases leading to transformer damage
Solution Approach 1:
The contact interface is segmented into multiple discrete contact points rather than relying on a single large contact surface. This approach maintains manufacturing feasibility while collectively providing sufficient contact area for effective surge voltage discharge. The multiple contact points work in parallel to handle the electrical load.
Solution Approach 2:
Different regions of the contact interface have different functional qualities - the contact points are designed with specific local geometries optimized for electrical contact, while the overall structure maintains mechanical stability. Each contact point has tailored dimensions and positioning to optimize its local contribution to the overall discharge efficiency.
4Device complexity
If the support structure is simplified, then the device complexity is reduced, but the fixing force decreases allowing shaft deformation during operations
Solution Approach 1:
The support structure is segmented into multiple support bodies (first support body, second support body, third support body) positioned at different locations. This segmentation distributes the fixing force across multiple points, providing adequate mechanical support without requiring a complex monolithic support structure. Each support body contributes to the overall stability.
Data Source
AI summary
The present invention relates to a multi-contact disconnect switch for a lightning arrester configured to maintain contact points of a contact shaft evenly and to improve the operation stability of the contact shaft, and more particularly to, a multi-contact disconnect switch for a lightning arrester including a first body having a passage formed therein and a multi-contact unit positioned on one side of the passage, and a second body having a contact shaft inserted into the passage and coupled to the other side of the first body, wherein, when the second body is coupled to the first body in a contact state, an end of the contact shaft is in contact with the multi-contact unit, and thus the multi-contact unit is in multi-contact with a contact circumferential surface of the contact shaft.