Compact Switching Pole Motion Assembly for Narrow Installations
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Solution Overview
Problem
Existing switching poles in medium voltage electrical systems are bulky, making installation challenging in narrow spaces, particularly at high voltage levels, and are costly to manufacture.
Innovation Solution
A switching pole with a compact, simple structure featuring a motion transmission assembly outside the vacuum interruption chamber, comprising a bushing element, pushrod, and elastic element, which allows for a movable contact to transition between open and closed positions with a mechanical load, reducing size and manufacturing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional switching pole structures are used, then electrical performance is maintained, but the device size becomes bulky and installation space requirements increase
Solution Approach 1:
The motion transmission assembly is nested within the insulating housing structure, with the pushrod, elastic element, and bushing element arranged concentrically and integrated into the housing volume. This allows the functional components to occupy minimal space while maintaining full electrical performance, directly resolving the contradiction between compact size and reliable operation
Solution Approach 2:
The insulating housing serves multiple functions simultaneously: it provides electrical insulation, structural support, and containment for the motion transmission assembly. By merging these functions into a single integrated structure, the switching pole achieves compact dimensions without compromising electrical performance or mechanical reliability
2Ease of manufacture
If conventional switching pole structures are used, then electrical performance is maintained, but manufacturing complexity and cost increase
Solution Approach 1:
The switching pole is divided into modular components: insulating housing, motion transmission assembly, and contact system. Each module can be manufactured separately using standard processes and then assembled, reducing manufacturing complexity while maintaining the electrical performance required for reliable operation
Solution Approach 2:
The insulating housing is designed as a universal component that provides structural support, electrical insulation, and mechanical guidance for the motion transmission assembly. This multi-functional design reduces the total number of parts required, simplifying manufacturing while ensuring reliable electrical performance through integrated design
3Volume of moving object
If compact switching pole design is implemented, then installation space is reduced, but device complexity may increase
Solution Approach 1:
The motion transmission components (pushrod, elastic element, bushing) are nested concentrically within the insulating housing, creating a compact radial arrangement that minimizes axial length. This nested configuration achieves space reduction without adding structural complexity, as all components share common mounting features and alignment references
Solution Approach 2:
The insulating housing integrates multiple structural functions: it serves as the mechanical guide for the pushrod, the electrical insulator, and the mounting structure for the contact system. By combining these functions into a single component, the design achieves compactness without increasing overall device complexity
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 solution achieves a compact and robust switching pole design that is easier to manufacture and install in narrow spaces, while maintaining electrical performance and reducing costs.
Implementation Method 1
an elastic element accommodated in a coupling cavity of the bushing element and interposed between the bushing element and the pushrod
Implementation Method 2
The bushing element is in sliding contact with the second pole terminal so as to be electrically connected to this latter
Data Source
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AI summary
A switching pole (1) comprises a vacuum interruption chamber (10) housing a fixed contact (2) and a movable contact (3) moving between an open position in which it is separated from the fixed contact (2) and a closed position in which it is electrically coupled to the fixed contact (2). In closed position said movable contact (3) has a closed condition in which it is electrically coupled to the fixed contact (2) and a closed and pressed condition in which it is electrically coupled to the fixed contact (2) under a mechanical load forcing it against said fixed contact (2). The switching pole (1) comprises an improved motion transmission assembly (4) which is operatively coupled to the movable contact (3) and is placed outside said vacuum interruption chamber (10).