Rotatable Shaft for Gas-Insulated Switching Device
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Solution Overview
Problem
The existing three-phase gas-insulated medium voltage switching devices with disconnecting devices between medium voltage levels and voltage transformers face complications due to complex mechanics and space constraints, leading to potential malfunctions and dielectric issues when operating from the front, especially with side-by-side bushings and contacts.
Innovation Solution
A rotatable shaft passing through the side wall of a gastight compartment allows for a simplified 90-degree movement of disconnector contacts between medium voltage and ground levels, eliminating the need for complex transmissions and enabling compact, front-accessible operation with metal sheet actuating elements and an insulating shaft, coupled with flexible conductive springs for contact compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the shaft axis is parallel to the panel front to allow front operation, then operational accessibility is improved, but complex transmissions and gears are required inside the encapsulation increasing device complexity
Solution Approach 1:
The patent changes the orientation of the shaft from being parallel to the panel front to being perpendicular to the side wall, effectively rotating the entire mechanism 90 degrees. This dimensional change allows the cinematic chain to be arranged outside the encapsulation, eliminating the need for complex internal transmissions while maintaining front accessibility through the side-wall penetration approach
2Ease of operation
If the cinematic chain is moved inside the encapsulation, then front operation is enabled, but the risk of malfunction increases due to complicated mechanics
Solution Approach 1:
The patent extracts the cinematic chain and manual operating means from inside the gastight encapsulation and relocates them to the external side wall area. This extraction eliminates the risk of internal malfunction while preserving the front operation capability, as the shaft still penetrates the side wall to operate the disconnecting contacts within the encapsulation
3Adaptability or versatility
If components are arranged inside the encapsulation, then integration is improved, but assembly complexity increases due to limited space and access
Solution Approach 1:
The patent segments the operating mechanism into two distinct parts: the shaft and disconnecting contacts remain inside the encapsulation for electrical integration, while the manual operating means and cinematic chain are placed outside for easy assembly and maintenance. This segmentation allows independent assembly of each subsystem without the constraints of limited internal space
4Area of stationary object
If the shaft passes through the side wall, then compact panel arrangement is enabled, but insulation requirements increase
Solution Approach 1:
The patent employs composite material construction for the shaft, combining insulating materials with mechanically robust properties. This allows the shaft to pass through the side wall and provide mechanical operation while maintaining electrical insulation between the high-voltage contacts inside the encapsulation and the external operating mechanism, thus enabling compact panel arrangement without compromising insulation
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 enhances operational simplicity, reduces the risk of malfunction, and allows for denser panel arrangement by eliminating the need for complex gears and transmissions, while maintaining effective insulation and mechanical stability.
Implementation Method 1
the conductive element is a spring made out of conductive material. The spring has to be flexible enough, to compensate the partly rotation movement of the contact means
Data Source
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AI summary
The invention relates to a three-phase gasinsulated medium voltage switching device with a disconnecting device between medium voltage levels and voltage transformers with disconnector contacts which are arranged on a rotatable shaft, in that way, that by a partly rotation of the shaft, the disconnector contacts switch connected voltage transformers between medium voltage level and ground level. The shaft is passing through the side wall of a gastight compartment and/or a housing.