Vacuum Interrupter Contact Assembly for Arc Elimination
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing load break switches in electric power systems face issues with open air arcing during disconnection, which reduces the lifespan of movable contacts and poses safety risks, and current methods like using a flicker blade to extinguish arcs lead to contact wear and inefficiency.
Innovation Solution
A contact assembly for electric power systems where electrical disconnection occurs within a switching device in parallel with a stationary contact, utilizing a vacuum interrupter and retention member to manage the disconnection process, eliminating open air arcing and reducing wear on movable contacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flicker blade is used to extinguish arcs in open air, then the arc can be extinguished, but the movable contact wears prematurely
Solution Approach 1:
The patent extracts the arc extinguishing function from the movable contact by introducing a separate switching device with its own contacts. The movable contact now only performs mechanical switching without participating in arc extinction, which eliminates wear on the movable contact while maintaining reliable arc extinguishing capability through the switching device's dedicated contacts.
2Productivity
If electrical disconnection occurs at the junction between movable and stationary contacts, then the switching function is achieved, but open air arcing occurs creating safety risks
Solution Approach 1:
The patent introduces a switching device as an intermediary component between the bus member and the movable contact. This switching device provides a dedicated enclosed space for electrical disconnection, mediating the transition from connected to disconnected state without exposing the arc to open air, thereby eliminating safety risks while maintaining switching functionality.
3Ease of operation
If the switching assembly moves to disconnect power, then electrical disconnection is achieved, but the arc extends through the arc chute causing wear
Solution Approach 1:
The patent segments the disconnection process into two independent stages: mechanical disconnection by the movable contact, and electrical disconnection by the switching device. This segmentation allows each component to perform its specific function optimally - the movable contact handles mechanical separation while the switching device handles arc extinction - thereby reducing overall material wear.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively contains switching energies within the switching device, enhancing safety and extending the lifespan of movable contacts by eliminating open air arcing and reducing material wear, thereby improving the reliability and safety of load break switches.
Implementation Method 1
utilizing a vacuum interrupter and retention member to manage the disconnection process, eliminating open air arcing
Data Source
AI summary
A contact assembly for an electrical component includes: a bus member; and a switching assembly structured to move between first and second positions. The switching assembly includes: a stationary contact extending from the bus member, a movable contact engaging the stationary contact when the switching assembly is in the first position and disengaging the stationary contact when the switching assembly moves toward the second position, and a switching device coupled to the bus member. When the switching assembly is in the first position, the switching device and the stationary contact are electrically connected in parallel with the bus member and the movable contact. When the switching assembly moves from the first position toward the second position, the switching device disconnects power after the movable contact disengages the stationary contact in order that electrical disconnection between the bus member and the movable contact occurs within the switching device.