Gas Shut-Off Switch Venting for Arc Byproduct Evacuation
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Solution Overview
Problem
Existing high-voltage electrical switchgear systems face issues with arc extinction and contamination due to watertight housings that accumulate impurities, leading to potential explosions and material damage, and the environmental impact of SF6 gas necessitates the search for more environmentally friendly alternatives.
Innovation Solution
A gas shut-off switch design with a housing that includes arc chambers with communication paths for gas evacuation and regeneration, utilizing a blowing mechanism connected to a movable contact to extinguish arcs and maintain a pure dielectric medium, allowing for pressures above 1500 mbar and using alternative gases like air, N2, or gas mixtures for insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a watertight housing is used to protect the switch, then the switch is protected from external contamination, but contaminants and arc byproducts accumulate inside the housing leading to potential explosions and material damage
Solution Approach 1:
The patent extracts the harmful contaminants and arc byproducts from the sealed housing by providing controlled communication paths that allow these substances to be removed from the internal environment, preventing their accumulation and eliminating the explosion risk while maintaining protection from external contamination
Solution Approach 2:
The patent implements a system where contaminants and degraded dielectric gas are discarded from the housing through the communication paths, and fresh dielectric gas is recovered and introduced into the housing, maintaining a clean internal environment for continuous reliable operation
2Reliability
If SF6 gas is used for insulation and arc extinction, then excellent dielectric properties are achieved, but environmental damage due to high greenhouse gas potential occurs
Solution Approach 1:
The patent changes the chemical composition parameter of the dielectric gas from SF6 to alternative gases with lower or zero greenhouse gas potential, while maintaining the necessary dielectric properties through careful selection of alternative gas compositions and optimizing the pressure parameters within the housing
Solution Approach 2:
The patent uses alternative inert or less harmful atmospheric compositions (such as nitrogen, air, or specialized gas mixtures) to replace SF6, creating an inert environment that provides adequate dielectric properties without the severe environmental impact of sulfur hexafluoride
3Stability of the object's composition
If the housing is sealed to maintain invariable internal conditions, then insulation stability is improved, but arc byproducts and contaminants accumulate causing safety hazards
Solution Approach 1:
The patent transitions from a static sealed housing to a dynamic system where the housing maintains stability during normal operation but allows controlled gas exchange and contaminant removal during or after arc events, balancing insulation stability with safety through dynamic gas management
Solution Approach 2:
The patent ensures continuous operation by maintaining a steady state where dielectric gas is continuously regenerated and contaminants are continuously removed through the communication paths, preventing accumulation and ensuring ongoing safety and reliability
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 solution effectively extinguishes electric arcs, evacuates contaminants, and regenerates the dielectric gas, reducing the risk of explosions and maintaining a clean insulating medium, while also offering a compact and environmentally friendly solution by using alternative gases with lower greenhouse gas potential.
Implementation Method 1
the vanes compress the dielectric gas inside the switch housing so that said gas exit through the spaces between the contacts and the vanes, thus blowing the electric arc in order to extinguish it
Implementation Method 2
the same dielectric gas, such as a dielectric gas of those mentioned above, in some cases also allows the extinction of the electric arc generated between the switch contacts
Implementation Method 3
an electric arc can occur in the switch opening and closing, and wherein said electric arc is extinguished
Data Source
AI summary
Gas shut-off switch (1) provided with various operating positions and intended to be isolated in a dielectric gas inside an electrical switchgear cell (19) comprising at least one housing (2) with a pair of fixed contacts (3, 4) arranged diametrically opposed to each other and a movable contact (5) having a rotary motion to electrically connect said fixed contacts (3, 4); an arc chamber (6, 7) and an electric arc blowing means (8) jointly connected to the movable contact (5), wherein the arc chamber (6, 7) comprises a communication path (9, 10) with the exterior of the housing (2) that allows both the exit of the gases generated in the electric arc blowing and the entry of clean dielectric gas in said arc chamber (6, 7).