Arc-Extinguishing Chamber Shifting Mechanism for DC Breaker Maintenance
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Solution Overview
Problem
The existing methods for maintaining and inspecting DC high-speed breakers are cumbersome and hazardous due to the heavy arc-extinguishing chamber, requiring specialized tools and posing risks of injury from accidental drops during shifting, and involve lengthy operations for detachment and reattachment of fastening components.
Innovation Solution
The implementation of an arc-extinguishing chamber shifting mechanism that allows the chamber to be easily and safely moved between operation and inspection positions using a horizontal sliding mechanism with wheels on rails, eliminating the need for external tools and reducing operational force through a controlled shift operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the arc-extinguishing chamber is detached for maintenance and inspection, then the contact portions can be accessed, but the operation becomes cumbersome and time-consuming due to the heavy weight requiring special tools and equipment
Solution Approach 1:
The arc-extinguishing chamber is designed to shift between fixed and movable states. During normal operation, it remains fixed to protect contacts. During maintenance, it can be easily shifted to expose contacts, transforming the system from static to dynamic to accommodate different operational needs.
Solution Approach 2:
The arc-extinguishing chamber is separated into a detachable component that can be independently shifted. This segmentation allows the chamber to be moved without detaching the entire breaker, enabling quick access to contacts for maintenance while keeping the rest of the system intact.
2Ease of operation
If the arc-extinguishing chamber is lifted and detached by one person, then the operation is simplified, but the heavy weight creates safety risks of injury from accidental drops
Solution Approach 1:
The shifting mechanism provides controlled movement between fixed and movable positions, eliminating the need for lifting and detaching. The chamber remains attached to the breaker body throughout, preventing accidental drops while still allowing access to contacts for maintenance.
Solution Approach 2:
A shifting mechanism acts as an intermediary between the arc-extinguishing chamber and the breaker body, enabling controlled movement without complete detachment. This intermediary structure provides stability and control during maintenance operations.
3Ease of repair
If fastening components are detached and reattached, then the arc-extinguishing chamber can be maintained and inspected, but the operation becomes lengthy and complex
Solution Approach 1:
The arc-extinguishing chamber shifts position along guides rather than requiring detachment of fastening components. This dynamic positioning system allows quick movement to inspection positions without the time-consuming process of detaching and reattaching fasteners.
Solution Approach 2:
The shifting mechanism is separated into independent components (chamber, guides, positioning elements) that can move relative to each other. This segmentation enables the chamber to be positioned for inspection without affecting the fastening structure of the rest of the breaker.
4Ease of operation
If the arc-extinguishing chamber is shifted horizontally, then the contact portions become exposed for maintenance, but the mechanism must prevent unintended shifts and drops
Solution Approach 1:
The system transitions between two stable states: fixed position during operation and shifted position during maintenance. The guiding mechanism ensures controlled movement between these states while preventing unintended shifts, combining dynamic accessibility with operational stability.
Solution Approach 2:
The guiding mechanism and positioning structure are designed to prevent unintended movement before it can occur. Guides and stops are pre-positioned to constrain the chamber's movement path, preventing drops or accidental shifts during normal operation.
Data Source
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AI summary
In an arc-extinguishing chamber shifting mechanism of a DC breaker, it is required that contact portions can be easily and safely maintained and inspected in a short time. Arc-extinguishing chamber shifting mechanism 17, by which the arc-extinguishing chamber 2 can be shifted between two positions which are composed of an operation position, which is arranged at an upper portion of the contact 5 at a fixed side and the contact 7 at a movable side, and an inspection position at which the arc-extinguishing chamber 2 is shifted in a horizontal direction from the operation position, and an upper portion of the contact 5 at a fixed side and the contact 7 at a movable side is set as an open state, is provided.