Earthing Switch Hollow Contact Structure for Eco-Gas Arc Extinction
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Solution Overview
Problem
Existing earthing switches in gas insulated switchgears experience varying switching performance due to differences in insulation characteristics between SF6 gas and eco-friendly gases, leading to insufficient performance when using alternative insulating gases.
Innovation Solution
The earthing switch design includes a movable contact part with a hollow portion and a piston part that allows for the circulation of insulating gas, preventing gas leakage and improving switching performance by guiding the movable contact part's movement and extinguishing arcs without a separate puffer cylinder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If eco-friendly gases are used to replace SF6 gas, then environmental friendliness is improved, but switching performance deteriorates due to lower insulation characteristics
Solution Approach 1:
The movable contact part is divided into multiple sections with hollow portions created between them, allowing insulating gas to be segmented and circulated through specific paths. This segmentation enables the gas to effectively reach arc extinction zones, compensating for the lower insulation characteristics of eco-friendly gases.
Solution Approach 2:
A piston part is introduced to create pneumatic action within the hollow portion, enabling the insulating gas to be pressurized and circulated actively. This pneumatic mechanism ensures sufficient gas pressure and flow rate for arc extinction, overcoming the limited insulation performance of eco-friendly gases.
2Reliability
If a separate puffer cylinder is added to improve switching performance, then arc extinction capability is improved, but device complexity increases
Solution Approach 1:
The hollow portion is integrated directly into the movable contact part structure, merging the puffer chamber function with the contact assembly. This eliminates the need for a separate puffer cylinder, reducing structural complexity while maintaining arc extinction capability through the piston-driven gas circulation.
Solution Approach 2:
The movable contact part serves multiple functions: it acts as both the switching contact and the housing for the hollow portion containing the piston mechanism. This multi-functionality reduces the overall number of components needed while ensuring effective gas circulation for arc extinction.
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
Ensures stable and efficient switching performance regardless of the type of insulating gas, maintaining safety and durability while simplifying the structure and reducing manufacturing costs.
Implementation Method 1
a piston part located in the hollow portion and moving relative to the movable contact part
Implementation Method 2
ensuring sufficient switching performance regardless of a type of insulating gas
Data Source
AI summary
An earthing switch includes a fixed contact part fixed in an enclosure, a movable contact part disposed to face the fixed contact part, having a hollow portion formed therein, and having one end portion connected to a driving device and driven by the driving device so that the other end portion thereof is connected to or separated from the fixed contact part, and a piston part located in the hollow portion and moving relative to the movable contact part, wherein the hollow portion extends in a longitudinal direction of the movable contact part, both end portions of the hollow portion are formed to be open in the longitudinal direction.