Vacuum Circuit Breaker Shield Segmentation
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Solution Overview
Problem
Conventional tank type vacuum circuit breakers face issues with mechanical vibration and impulse force transfer during opening and closing operations, leading to abrasion and assembly challenges due to direct conductor insertion and large shield diameters.
Innovation Solution
A tank type vacuum circuit breaker design utilizing a flexible conductor to connect bushing conductors to terminals, with a shield configuration that separates into a main body and bushing side components to suppress mechanical vibration and impulse forces, facilitating assembly and adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a rigid conductor is directly inserted into the contact case for connection, then the connection structure is simple, but mechanical vibration and impulse force during opening and closing operations are directly transferred to the conductor and porcelain tube, causing abrasion and fastening portion slack
Solution Approach 1:
The patent employs a flexible conductor instead of a rigid conductor for the connection between the bushing and the contact case. This flexible conductor can absorb mechanical vibrations and impulse forces during opening and closing operations, preventing direct force transfer to the porcelain tube and contact case, thereby eliminating abrasion and fastening portion slack while maintaining connection reliability.
Solution Approach 2:
The flexible conductor acts as an intermediary element between the rigid bushing conductor and the contact case. It mediates the mechanical stress and vibration, providing a buffer that protects the connection components from direct mechanical impact while maintaining electrical continuity.
2Object-affected harmful factors
If a single large shield covers the entire connection portion, then electric field relaxation is achieved, but the outer diameter of the shield becomes large, making assembly and dimension adjustment troublesome
Solution Approach 1:
The patent divides the single large shield into multiple smaller shield segments positioned at different locations along the connection portion. Each segment provides localized electric field relaxation where needed, while the segmented structure reduces the overall outer diameter, facilitating easier assembly and dimension adjustment compared to a single large shield.
Solution Approach 2:
Instead of providing uniform shielding across the entire connection portion with a large shield, the patent applies shielding locally at specific points where electric field concentration occurs. This localized shielding approach achieves electric field relaxation effectiveness while minimizing the overall shield dimensions and simplifying assembly.
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
The design effectively reduces mechanical vibration and impulse force transfer, simplifies assembly and adjustment, and minimizes the radial dimension of the shield, enhancing the compactness and ease of manufacturing.
Implementation Method 1
flexible conductor which connects the lower end of a conductor of each of the bushings to each of the connection terminals
Implementation Method 2
suppress mechanical vibration and impulse force due to opening and closing operation from being transferred to the bushing side
Implementation Method 3
the connection conductor portion is a portion where an electric field is concentrated; and therefore, the whole is covered by a shield for electric field relaxation
Data Source
AI summary
In a tank type vacuum circuit breaker in which each of movable side and fixed side connection terminals of a vacuum interrupter arranged in a main tank and the lower end of each of conductors of a pair of bushings arranged in a standing condition in the main tank are connected by a flexible conductor and a shield for surrounding connection portions is provided, the shield is configured by combining: a main body side shield which is provided on axial both sides of the vacuum interrupter and covers a connection portion of the flexible conductor and the connection terminal; and a bushing side shield which is provided on the lower end side of the conductor and covers a connection portion of the conductor and the flexible conductor.