High Voltage Switch Intermediate Wall Casting
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Solution Overview
Problem
High-voltage switches face challenges in achieving efficient current interruption and maintaining high-quality quenching gas during quick reclosure, leading to increased drive energy requirements and potential dielectric issues due to insufficient extinguishing gas generation.
Innovation Solution
The integration of an intermediate wall into a hollow cast metal body simplifies design and manufacturing, allowing for a larger intermediate volume that ensures fresh, high-quality insulating gas is supplied to the compression chamber during reclosure, reducing drive energy needs and maintaining gas quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the intermediate volume is increased to ensure fresh insulating gas supply during quick reclosure, then the drive energy requirement is reduced, but the device complexity increases due to additional structural components
Solution Approach 1:
The intermediate wall is integrated into the hollow cast metal body, merging two separate components into one. This reduces the number of parts and assembly steps while maintaining the functional separation between exhaust space and intermediate volume, thus reducing device complexity while preserving the energy-saving benefit of the larger intermediate volume
Solution Approach 2:
The hollow cast metal body serves multiple functions: it provides structural support, contains the intermediate volume, separates exhaust gases from the intermediate volume, and guides the moving contact piece. By combining multiple functions into a single component, the device complexity is reduced while maintaining the ability to provide sufficient fresh insulating gas during quick reclosure
2Reliability
If a separate intermediate wall is used to separate exhaust space from intermediate volume, then the gas quality is maintained, but the manufacturing cost and complexity increase
Solution Approach 1:
The intermediate wall is merged with the hollow cast metal body into a single integrated component. This allows the entire structure to be manufactured in one casting process, eliminating the need for separate manufacturing and assembly of the intermediate wall, thereby reducing manufacturing cost and complexity while maintaining the gas-tight separation function
Solution Approach 2:
The design transitions from using a separate intermediate wall component to integrating it into the cast metal body structure. This parameter change in the manufacturing approach maintains the functional separation required for gas quality while significantly simplifying the manufacturing process
3Quantity of substance
If the compression chamber volume is increased to store more extinguishing gas, then the switching capacity is improved, but the drive energy requirement increases
Solution Approach 1:
The intermediate volume is pre-filled with fresh, high-quality insulating gas before switching operations. During quick reclosure, this pre-stored gas is immediately available to replenish the compression chamber, eliminating the need to compress large volumes of gas during the switching operation itself, thus reducing drive energy while maintaining sufficient extinguishing gas quantity
Solution Approach 2:
The intermediate volume acts as an intermediary reservoir that stores fresh insulating gas and supplies it to the compression chamber during quick reclosure. This mediator allows the system to maintain a smaller compression chamber volume while still having access to sufficient extinguishing gas, thereby reducing the drive energy required
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 solution ensures a consistent supply of high-quality quenching gas, reducing drive energy consumption and enhancing switching capacity while maintaining good dielectric properties, thus improving the overall efficiency and reliability of the high-voltage switch.
Implementation Method 1
a piston-cylinder compression device (50) that can be actuated by the drive (D) and has an annular compression chamber (52) for receiving quenching gas
Implementation Method 2
the amount of quenching gas generated by the switching arc is generally not sufficient to achieve a dielectrically solidified switching gap by thermal blowing of the switching arc
Implementation Method 3
a housing (10) filled with insulating gas (11) and radially outwardly delimiting a storage space (11) for the insulating gas (11)
Data Source
Figure 1
Figure 2
AI summary
The switch has an intermediate wall (42) designed as a part of a hollow metal casting body (40) that contains exhaust and suction openings (47, 48). An intermediate volume (44) is arranged between compression and exhaust regions (52, 43) and separated from the exhaust region by the wall. A piston-cylinder-compression device (50) has a piston (51) fastened at a front side of the body, where the piston axially limits the volume. A capacity of the volume defined by axial distance of the volume from the piston is larger than capacity of the compression region in a switch-on position of the switch.