Grounding Switch Valley Section Reduces Mechanical Burden
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Solution Overview
Problem
Conventional grounding switches in gas insulated switchgear face significant mechanical burden and high operation energy due to repulsive forces from hot gas and frictional resistance when a moving contact erroneously enters a high-voltage electrode, leading to arcing and prolonged gas pressure increases.
Innovation Solution
The design incorporates a high-voltage electrode and earth electrode with a moving contact that includes a valley section between high-voltage arc and main contacts, reducing frictional resistance and repulsive forces by preventing direct contact with the valley section, thus alleviating mechanical burden on the drive mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed angle taper is provided from the tip of the arc-focusing contact to the main contact section, then the moving contact can be driven along the center axis, but the moving contact continues to be subject to substantial repulsive force due to frictional resistance between the contacts
Solution Approach 1:
The contact structure is segmented into distinct sections: the arc-focusing contact tip, the main contact section, and a newly introduced valley section between them. This segmentation allows the moving contact to transition through different geometric profiles, reducing continuous frictional resistance during insertion while maintaining reliable electrical contact at both the arc and main contact points.
2Reliability
If the moving contact is reciprocally driven along the center axis into the high-voltage electrode, then grounding function is achieved, but substantial mechanical burden is placed on the drive mechanism due to repulsive forces from hot gas and frictional resistance
Solution Approach 1:
By segmenting the contact interface into arc contact, valley section, and main contact portions, the insertion process is divided into phases with different friction characteristics. The valley section specifically addresses the high-friction zone, reducing the mechanical burden on the drive mechanism while preserving the reliable grounding function through maintained contact pressure at the main contact points.
Solution Approach 2:
The geometric parameters of the contact surface are changed by introducing the valley section with specific curvature and depth parameters. This modifies the frictional characteristics during insertion, reducing the repulsive force profile experienced by the moving contact while maintaining the electrical contact parameters necessary for reliable grounding.
3Reliability
If the moving contact makes contact with the high-voltage electrode during erroneous operation, then arc occurs due to breakdown of insulation, but the surrounding gas reaches high temperature and pressure rises abruptly creating repulsive force
Solution Approach 1:
The valley section acts as an intermediary geometric feature between the arc contact and main contact sections. During erroneous operation with arc formation, this intermediate structure modifies the gas dynamics and pressure distribution, potentially reducing the repulsive force from hot gas by creating a more favorable pressure gradient or flow path around the moving contact.
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 configuration reduces the sum of repulsive forces during arcing and insertion, lowering the mechanical load and operation energy required for the drive mechanism, while maintaining stable earthing and energizing contact pressure.
Implementation Method 1
tanks that encapsulate an insulating gas; electrically connected to the high-voltage electrode and arranged along a circumferential direction taking the center axis as a center
Implementation Method 2
an arc occurs due to breakdown of insulation between the electrodes; an arc occurs across the moving arc contact and the high-voltage arc contact
Implementation Method 3
the gas pressure rises abruptly; Gas for which the pressure has abruptly risen then acts as a repulsive force on the moving contact during operation
Data Source
AI summary
A valley section is provided between a high-voltage arc contact and a high-voltage main contact. Because of the presence of the valley section, resistance between contacts is reduced while a moving arc contact makes contact with the high-voltage arc contact and then slides up to making contact with the high-voltage main contact.