Switchgear Movable Contact Deformation Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In larger gas-insulation switchgear, the increased electromagnetic force on the movable contact during main circuit energization can lead to inadequate prevention of deformation when the movable contact is brought into contact with the fixed contact, especially with existing cantilever structures that are insufficient to counteract these forces.
Innovation Solution
A switchgear design featuring a tank with specific through holes, an operating rod supported by bearings, a connecting plate, and a shielding plate to guide and support the movable contact, preventing deformation by distributing the force more effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a cantilever structure rod member is used to guide the movable contact, then the structure is simple, but the rod member cannot prevent deformation of the movable contact when electromagnetic force increases with larger switchgear capacity
Solution Approach 1:
The rod member is divided into two separate rod members, each extending from a different wall surface of the tank toward the movable contact. This segmentation allows each rod member to independently provide guidance and support, increasing the overall structural stability and ability to counteract electromagnetic forces without significantly increasing complexity.
Solution Approach 2:
The rod members are positioned to extend from different directional dimensions (opposite wall surfaces) toward the movable contact, creating a multi-dimensional support structure. This dimensional approach enhances the rigidity and load-bearing capacity of the guidance system, enabling it to withstand higher electromagnetic forces in larger switchgear.
2Power
If the switchgear capacity is increased to handle higher voltage, then the power handling capability is improved, but the electromagnetic force on the movable contact increases causing inadequate prevention of deformation
Solution Approach 1:
The rod members function as mechanical counterforces to the electromagnetic force acting on the movable contact. By providing rigid guidance structures extending from opposite walls, they create opposing mechanical forces that balance and counteract the electromagnetic forces, preventing deformation even when the switchgear handles higher voltages and powers.
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 deformation of the movable contact during contact with the fixed contact, even under higher voltage conditions, by providing adequate support and alignment to counteract electromagnetic forces.
Implementation Method 1
a first bearing provided in the first through hole to support the operating rod; and a second bearing provided in the second through hole to support the operating rod
Implementation Method 2
When such an erroneous operation is performed, an electromagnetic force acts on the movable contact, and a force to deform the movable contact is applied to the movable contact
Data Source
AI summary
A switchgear includes: a tank having a first through hole; a fixed contact in the tank; a movable contact capable of reciprocating between a position in contact with the fixed contact and a position separated from the fixed contact; and an operating rod capable of reciprocating in a direction parallel to the direction of movement of the movable contact, and penetrating through the first through hole. The switchgear further includes: a connecting plate connecting the movable contact and the operating rod; a shielding plate disposed closer to the fixed contact than the connecting plate, having a second through hole through which the operating rod penetrates and a third through hole through which the movable contact is capable of passing formed therein; a first bearing disposed in the first through hole to support the operating rod; and a second bearing disposed in the second through hole to support the operating rod.