Gas Insulated Switchgear Cylindrical Member Welding
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Solution Overview
Problem
Conventional gas insulated switchgear faces insulation performance deterioration due to metal foreign matters, which are not effectively trapped, leading to increased costs from groove machining on tank flanges.
Innovation Solution
A gas insulated switchgear design featuring a cylindrical member formed by curving a metal plate into a cylindrical shape with welding portions on the lower side, creating openings or grooves to trap metal foreign matters, enhancing trapping efficiency while maintaining structural strength without extensive welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If groove machining is performed on the flange to trap metal foreign matters, then the insulation performance is improved, but the manufacturing cost increases
Solution Approach 1:
The invention extracts the metal foreign matter trapping function from the flange structure and relocates it to a dedicated cylindrical member positioned within the tank. This cylindrical member with its specific geometric features (protrusions or grooves) captures metal particles through electromagnetic field effects, separating the trapping function from the structural flange and avoiding the need for costly flange machining while maintaining insulation performance
Solution Approach 2:
The cylindrical member acts as an intermediary element between the electromagnetic field and the metal foreign matters. It provides a dedicated structure that interacts with the electromagnetic field to trap metal particles, mediating the trapping process without requiring modification of the flange structure, thus resolving the contradiction between effective trapping and manufacturing cost
2Strength
If extensive welding is performed to form the cylindrical member, then the structural strength is improved, but the manufacturing complexity increases
Solution Approach 1:
The cylindrical member is constructed by joining multiple plate-like members in a segmented manner. This segmentation allows for easier manufacturing of individual components with standard welding procedures, while the overall cylindrical structure maintains sufficient structural strength. The segmented approach reduces the complexity of forming a complete cylindrical structure in one piece
Solution Approach 2:
Welding is applied locally at specific joints of the plate-like members rather than extensively across the entire cylindrical surface. This localized welding approach provides sufficient structural strength at critical connection points while minimizing manufacturing complexity and welding volume, resolving the contradiction between strength and manufacturing 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 design efficiently traps metal foreign matters, improving insulation performance and reducing the size of the switchgear, while being cost-effective by minimizing the need for extensive machining.
Implementation Method 1
The metal foreign matters are moved by an electric field in the tank
Data Source
AI summary
A gas insulated switchgear includes: a center conductor that is arranged to extend horizontally in a tank; a cylindrical member that is arranged in the tank to surround a center conductor, and formed by curving a metal plate-like member into a cylindrical shape and then joining circumferentially opposed both ends of the plate-like member by welding to form a welding portion, the welding portion being located on a lower side of the cylindrical member; and a current transformer for instruments, through which the cylindrical member is inserted, the current transformer being supported by the cylindrical member, and being arranged to surround the center conductor. The welding portion includes a metal spacer sandwiched between the circumferentially opposed both ends of the plate-like member, and the spacer and the ends are welded to each other.