Gas-Insulated Switchgear Arc Shield Design
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Solution Overview
Problem
Conventional gas-insulated switchgear faces issues with arc diffusion and requires expensive arc-resistant members with large outer diameters, leading to increased costs and size.
Innovation Solution
A gas-insulated switchgear design featuring a fixed-side arc shield in the form of a thin circular plate with an opening larger than the movable conductor, generating magnetic flux to restrict arcs radially and reduce the outer diameter of the electrode, while using an arc-resistant member efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional arc-resistant member with large outer diameter and wall thickness is used, then arc diffusion is prevented, but the outer diameter of the electrode increases and cost increases
Solution Approach 1:
The invention changes the geometric parameters of the arc-resistant member by forming a convex curved portion that protrudes toward the arc. This curvature modification allows the arc to be concentrated on a smaller effective area, preventing arc diffusion while enabling a reduction in the overall outer diameter and wall thickness of the member compared to conventional flat designs.
Solution Approach 2:
The invention applies curvature by forming a convex curved portion on the arc-resistant member. This curved surface geometry naturally directs and concentrates the arc, achieving effective arc control with a more compact structure, thereby reducing the outer diameter requirement while maintaining arc diffusion prevention.
2Reliability
If a conventional arc-resistant member with large outer diameter and wall thickness is used, then arc diffusion is prevented, but production cost increases
Solution Approach 1:
By modifying the geometric parameters to include a convex curved portion, the invention reduces the total volume of expensive arc-resistant material required. This parameter change maintains arc control effectiveness while reducing material consumption, leading to lower production costs.
Solution Approach 2:
The invention applies arc-resistant material with convex curvature only where needed to control the arc, rather than requiring a uniformly thick and large member throughout. This localized quality approach reduces overall material usage and cost while maintaining necessary arc diffusion prevention at critical locations.
3Length of stationary object
If the outer diameter of the arc-resistant member is reduced, then cost and size are reduced, but arc diffusion control becomes difficult
Solution Approach 1:
The convex curved portion creates a focused geometry that naturally directs the arc along the curved surface. This curvature effect allows a smaller outer diameter member to maintain effective arc control, as the curved surface concentrates the arc path rather than allowing it to diffuse across a flat or larger surface.
Solution Approach 2:
By changing the geometric parameters to include a protruding convex portion, the invention creates a more efficient arc control geometry. This parameter modification allows the arc to be effectively contained on a smaller diameter structure, maintaining reliability while reducing size.
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 effectively prevents arc diffusion, reduces the outer diameter of the electrode, and lowers production costs by optimizing the use of arc-resistant materials.
Implementation Method 1
the fixed-side arc shield causing an arc current to flow outward in a radial direction during contact parting of the fixed-side conducting contact and the movable conductor to generate magnetic flux on a surface thereof in a circumferential direction that produces a force acted on an arc in a direction of a central axis
Implementation Method 2
the fixed-side arc shield causing an arc current to flow outward in a radial direction during contact parting of the fixed-side conducting contact and the movable conductor
Data Source
AI summary
A gas-insulated switchgear includes a fixed-side electrode having a tubular fixed-side-conducting contact and a fixed-side shield for housing the fixed-side-conducting contact, and a movable-side electrode having a movable conductor driven by a driving unit to be connected to and separated from the fixed-side-conducting contact, facing each other in a container filled with an insulating gas. The switchgear includes a fixed-side-arc shield in the form of a circular plate, which is made of an arc-resistant member and has an opening of a diameter larger than the outer diameter of the movable conductor, the opening being formed on the side of the fixed-side shield facing the movable-side electrode. The fixed-side-arc shield is formed into a thin plate so as to cause an arc current to flow outward in a radial direction during contact parting of the fixed-side-conducting contact and the movable conductor to generate magnetic flux on a surface thereof in a circumferential direction.