Gas Insulated Switchgear Insulating Screen for Electric Field Control
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Solution Overview
Problem
In gas insulated switchgear, a high electric field concentration between movable and fixed contacts poses a risk of secondary electrical accidents and contact contamination due to arcs.
Innovation Solution
An insulating screen unit is installed between the contacts, comprising an insulating screen rotatably coupled to the moving side shield, a push link, support spring, constraint pin, and constraint spring, which blocks the electric field by opening and closing the opening end of the moving side shield as the contacts move, preventing field concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If shields are added to protect contacts, then contact protection is improved, but electric field concentration between contacts increases
Solution Approach 1:
An insulating screen unit is introduced as an intermediary component between the movable contact and fixed contact. This screen unit selectively blocks the electric field lines between the contacts when they are in the open state, preventing field concentration while allowing the shields to maintain their protective function against contamination.
Solution Approach 2:
The electric field blocking function is applied locally only in the region between the contacts when they are open, rather than blocking the entire field. The insulating screen is positioned specifically to block field lines in the critical gap region while maintaining other necessary electric field distributions for normal operation.
2Object-generated harmful factors
If insulating screen unit is added to block electric field, then electric field concentration is reduced, but device complexity increases
Solution Approach 1:
The insulating screen unit is designed to be movable rather than fixed, changing its position based on the contact state. When contacts close, the screen moves away to avoid interference; when contacts open, the screen moves into position to block the electric field. This dynamic behavior allows a single component to serve multiple functions without permanently increasing structural complexity.
Solution Approach 2:
The insulating screen unit combines multiple functions: it blocks electric field lines, provides additional contact protection, and works cooperatively with the existing shields. By merging these functions into a single integrated component rather than adding separate elements, the overall device complexity is minimized while achieving the desired electric field control.
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 insulating screen unit effectively reduces electric field concentration between contacts, preventing secondary electrical accidents and contamination, ensuring safe operation of the gas insulated switchgear.
Implementation Method 1
an insulating screen unit installed to selectively block the opening end of the moving side shield and covering an end of the movable contact when the movable contact is separated from the fixed contact
Implementation Method 2
a support spring supporting the push link in a direction of the lower conductor
Data Source
AI summary
A gas insulated switchgear includes: an upper conductor; a lower conductor; a movable contact provided in the upper conductor; a fixed contact fixedly provided in the lower conductor; a moving side tulip contact provided in the movable contact; a moving side shield fixed to the upper conductor; a fixed side tulip contact provided in the fixed contact; a fixed side shield fixed to the lower conductor; and an insulating screen unit installed to selectively block the opening end of the moving side shield and covering an end of the movable contact when the movable contact is separated from the fixed contact.