Vacuum Interrupter Coil Electrode Layout for Wider Axial Field Coverage
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Solution Overview
Problem
Existing vacuum interrupters face challenges in ensuring effective axial magnetic field intensity at contact portions outside the primary axial magnetic field generation region, leading to suboptimal interruption performance.
Innovation Solution
The vacuum interrupter incorporates a coil electrode design with ring portions, first and second coil portions, arm portions, and bypass portions, which enhance the axial magnetic field intensity across the contact portion by optimizing the current path and magnetic field distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If coil portions are separated and disposed only at specific regions to generate axial magnetic field, then axial magnetic field intensity is improved at those regions, but axial magnetic field intensity deteriorates at other contact portions (center portion, portions above arm portions and power feeding portions)
Solution Approach 1:
The coil electrode is divided into multiple independent coil portions (first coil portions and second coil portions) separated by slits. Each coil portion can be independently positioned to generate magnetic field in specific regions, allowing comprehensive coverage of the entire contact portion including center regions and areas above arm portions and power feeding portions.
Solution Approach 2:
The coil portions are arranged not only in the circumferential direction but also in the axial direction, creating a three-dimensional magnetic field distribution. The first coil portions are disposed at one axial level while second coil portions are disposed at another axial level, enabling magnetic field penetration and coverage in previously unreachable regions.
2Strength
If more coil portions are added to improve magnetic field coverage, then axial magnetic field intensity is improved across contact portions, but device complexity increases
Solution Approach 1:
The coil electrode structure serves multiple functions: the first coil portions generate magnetic field in primary regions, the second coil portions extend coverage to center and upper regions, the arm portions provide structural support and current conduction, and the slits enable both magnetic field optimization and manufacturing flexibility. This multi-functionality reduces the need for additional separate components.
Solution Approach 2:
The arm portions serve dual purposes as both structural support elements and current conduction paths. The slits simultaneously separate coil portions for magnetic field optimization and provide pathways for current distribution. This merging of functions reduces overall structural complexity while achieving comprehensive magnetic field coverage.
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 design effectively increases the axial magnetic field intensity even at regions outside the primary generation area, improving the interruption performance and extending the life of the vacuum interrupter.
Implementation Method 1
a magnetic field in an axial direction, which is a direction along an axis of both electrode rods, by current conduction
Data Source
AI summary
Provided is a vacuum interrupter capable of improving an axial magnetic field intensity even at a contact portion other than a region of the contact portion corresponding to a region surrounded by an arm portion and a coil portion. In the vacuum interrupter according to the present disclosure, in each coil electrode, a bypass portion has: a second coil portion which extends so as to have an overlap with a corresponding first coil portion and a power feeding portion opposed to the first coil portion, in a circumferential direction; a first arm portion which connects the second coil portion and a ring portion; and a second arm portion which connects the second coil portion and the first coil portion.