Switching Device Lashing Points Center of Gravity
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Solution Overview
Problem
The existing switching devices with encapsulating housings and lashing points face challenges in reduced structural height and increased upheaval forces, particularly in earthquake-prone regions, necessitating improved stability and mechanical reinforcement.
Innovation Solution
The lashing points are arranged such that the center of gravity is below them, with the flange closed by a gear cover, allowing for vertical lashing direction forces to be distributed effectively, and add-on parts can be supported on the casing side between lashing points for enhanced stability and attachment options.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a support frame with lashing points is used for direct connection to foundation, then the switching device can be securely lashed, but the overall height increases which complicates transport
Solution Approach 1:
The lashing points are integrated directly into the encapsulation housing structure, merging the lashing function with the housing itself rather than using a separate support frame. This eliminates the need for additional height while maintaining lashing capability.
Solution Approach 2:
The lashing points are arranged in a specific spatial configuration where the center of gravity lies below the lashing points in the lashing direction. This vertical arrangement within the existing height envelope creates stabilizing leverage without increasing overall height.
2Strength
If mechanical reinforcements are added to withstand increased breaking forces in earthquake-prone regions, then the stability improves, but the device complexity and height increase
Solution Approach 1:
The lashing points are formed as an integral part of the encapsulation housing, combining the housing structure with the lashing attachment points. This eliminates separate reinforcement components while maintaining strength to withstand breaking forces.
Solution Approach 2:
The lashing points are positioned at specific locations on the housing with the center of gravity below them, creating a favorable force distribution geometry. This positional parameter optimization allows the housing itself to resist breaking forces without additional complex reinforcements.
3Stability of the object's composition
If the center of gravity is positioned below the lashing points, then the stability during lashing improves, but the design flexibility is reduced
Solution Approach 1:
The lashing points serve multiple functions: they provide secure attachment for lashing, act as crane points for lifting due to their position above the center of gravity, and maintain structural integrity. This multi-functionality achieves stability while preserving design versatility.
Solution Approach 2:
The lashing points are arranged in a vertical configuration relative to the center of gravity, creating a stable lever arm for lashing forces. This vertical arrangement within the existing height envelope creates stabilizing leverage without increasing overall height.
Data Source
Figure 1
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AI summary
A switching device comprises an encapsulation housing (1). The switching device is provided with lashing points (7a, 7b, 7c, 7d) which are arranged in such a manner that a center of gravity of the switching device lies below the lashing points (7a, 7b, 7c, 7d) in the lashing direction (8).