Insulated Switchgear Layout for Compact Flashover Resistance
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Solution Overview
Problem
Medium-voltage and high-voltage electrical distribution components using air insulation face challenges in preventing flashover events, particularly during lightning strikes or transient voltage surges, which existing designs address inadequately.
Innovation Solution
A compact switching apparatus with an insulating housing enclosing a disconnector and circuit breaking device, using insulated branch and phase busbars outside the housing, and field-controlling shields to manage electrical fields, reducing free electron production and increasing path lengths to prevent flashovers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If air insulation is used instead of gas insulation, then environmental compatibility is improved, but flashover resistance deteriorates
Solution Approach 1:
The housing wall is segmented into multiple sections, with insulating material placed in at least one section. This segmentation allows the structure to maintain compact dimensions while providing effective insulation paths that prevent flashover, resolving the contradiction between using air insulation for environmental compatibility and maintaining flashover resistance.
Solution Approach 2:
An insulating material is introduced as an intermediary element within the housing wall structure. This intermediary provides the necessary electrical insulation in air-insulated apparatus, enabling the system to achieve both environmental compatibility through air insulation and adequate flashover resistance through the insulating material barrier.
2Reliability
If large separation distances are used to prevent flashover, then flashover resistance is improved, but device compactness deteriorates
Solution Approach 1:
Insulating material is placed locally within specific sections of the housing wall rather than requiring uniform large separation distances throughout. This local quality approach provides targeted insulation where needed, maintaining flashover resistance while allowing the overall device to remain compact.
Solution Approach 2:
The insulation function is achieved by utilizing the wall thickness dimension of the housing structure, rather than requiring increased separation distances in the horizontal or lateral dimensions. This dimensional approach allows flashover protection without compromising device compactness.
3Reliability
If complex arrangements of insulating materials are used, then flashover resistance is improved, but device complexity deteriorates
Solution Approach 1:
The housing wall serves multiple functions: it provides structural support, defines the device boundary, and incorporates insulating material to prevent flashover. This multi-functionality eliminates the need for separate complex insulating structures, achieving flashover resistance while maintaining device simplicity.
Solution Approach 2:
The insulating function is merged with the housing wall structure itself, rather than being a separate component. By combining the structural housing element with the insulation function through material placement in wall sections, the device achieves flashover protection without adding structural 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 apparatus effectively reduces the likelihood of flashover events by insulating branch busbars and controlling electrical fields, providing a compact and efficient design with simplified manufacturing.
Implementation Method 1
an insulating material disposed inside the housing wall... blocking a path between the high voltage region and the ground region
Data Source
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AI summary
A switching apparatus and a switching system are provided. The switching apparatus comprises an insulating housing comprising a housing wall, a disconnector disposed inside the insulating housing and at least partially surrounded by the housing wall, an insulated branch busbar disposed outside the insulating housing, such that part of the housing wall is disposed between the disconnector and the insulated branch busbar, an insulated connection element passing through the housing wall connecting the second end of the disconnector to the insulated branch busbar, and an insulated phase busbar connected to the branch busbar. The switching system comprises a plurality of switching apparatuses.