Coaxial Switch Operating Mechanism for Gas-Tight Trip and Reset
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Solution Overview
Problem
In gas-insulated switchgear, existing operating mechanisms for switches often lead to insulating gas leakage due to the need for multiple mechanical connections, which compromises the airtight compartment's integrity.
Innovation Solution
A device featuring coaxially arranged primary and secondary shafts with rotational play, a spring for urging the primary shaft, a control lever for radial movement, a latch with a disengage lever, and a reset lever, which minimizes the number of openings in the compartment, allowing for efficient switching between open and closed positions while reducing gas leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple mechanical connections are used to allow displacement and loads to be transferred between inside and outside of the compartment, then the operability of the operating mechanism is improved, but the leakage of insulating gas increases
Solution Approach 1:
The patent combines multiple functional elements (primary shaft, secondary shaft, coupling, control lever, latch, roller, and reset lever) into a single integrated operating mechanism that operates through one opening in the gas-tight compartment. This merging of functions eliminates the need for multiple separate mechanical connections, thereby maintaining full operability while minimizing gas leakage paths.
Solution Approach 2:
The operating mechanism is designed as a multi-functional system where a single mechanism performs multiple operations: transferring displacement, transferring loads, enabling switching between open and closed positions, and allowing tripping and resetting. This universal design achieves all operational requirements through one compact mechanism, reducing the number of openings needed.
2Loss of substance
If the number and size of elements of the operating mechanism are minimized to reduce leakage, then the insulating gas leakage is reduced, but the required displacement and loads may not be adequately transferred
Solution Approach 1:
The operating mechanism employs dynamic elements including a spring that actively urges the primary shaft in a first rotational direction, and a coupling with rotational play that allows relative axial rotation between primary and secondary shafts. These dynamic features enable the mechanism to handle required displacements and loads effectively while maintaining a compact design with minimal openings.
Solution Approach 2:
The mechanism is segmented into distinct functional components (primary shaft for load transfer, secondary shaft for locking/releasing operations, control lever for radial movement, latch for limiting rotation) that work together through a single opening. This segmentation allows each element to be optimized for its specific function while collectively achieving full operational capability with minimal gas leakage.
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 effectively reduces or prevents gas leakage by allowing for tripping and resetting of the switch with fewer compartment openings, maintaining the airtight integrity and enabling reliable operation.
Implementation Method 1
a spring for urging the primary shaft in a first rotational direction
Data Source
AI summary
The invention relates to a device for operating a switch having an operating lever for moving the switch between the open and closed position and an operating pin arranged to a moving part of the switch, wherein the device comprises a primary shaft, a secondary shaft arranged coaxially with the primary shaft, a coupling arranged between the primary shaft and the secondary shaft, a spring, a control lever extending in a radial direction from the primary shaft, a latch having a disengage lever extending in a radial direction from the primary shaft and a roller movable into the path of the disengage lever to limit rotation of the primary shaft in the first rotational direction; and, a reset lever extending in a radial direction from the secondary shaft.