Circuit Breaker Shielded Edge for Exhaust Gas Control
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Solution Overview
Problem
High-voltage switches face challenges in maintaining dielectric strength due to hot exhaust gases with low density escaping into the insulating gas, which temporarily reduce dielectric properties, affecting operational reliability.
Innovation Solution
An electrically shielded ring-shaped edge is arranged around the housing extension to guide exhaust gases as a radially limited gas jet into the metal container, suppressing the Coanda effect and preventing hot gases from entering heavily dielectrically stressed areas, combined with a flow ring on the outer surface to ensure reliable detachment and maintain dielectric strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If exhaust gases escape into the metal container, then the switching function is achieved, but the dielectric properties of the insulating gas are reduced
Solution Approach 1:
The patent extracts the harmful hot exhaust gases from the general insulating gas environment by directing them through a separate outlet channel into a designated exhaust volume, preventing contamination of the main insulating gas space and preserving dielectric strength
Solution Approach 2:
The patent introduces an intermediary flow separation edge that mediates between the exhaust gas flow and the insulating gas environment, causing the exhaust gases to detach and form a radial jet that is confined and directed away from heavily dielectrically stressed areas
2Productivity
If exhaust gases are allowed to escape freely, then the switching operation is completed, but hot gases enter heavily dielectrically stressed areas
Solution Approach 1:
The patent applies local quality by creating a flow separation edge with specific geometric properties at the outlet channel opening, which locally modifies the exhaust gas flow behavior to detach and form a radial jet, preventing intrusion into heavily dielectrically stressed areas while maintaining overall switching operation efficiency
3Ease of operation
If the Coanda effect is allowed to occur, then exhaust gases follow the housing surface, but dielectric strength is reduced in heavily stressed areas
Solution Approach 1:
The patent applies preliminary anti-action by designing the outlet channel opening with a flow separation edge that pre-empts the Coanda effect, causing the exhaust gas flow to detach immediately at the opening rather than adhering to the housing surface, thereby preventing dielectric strength reduction before it can occur
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
This configuration increases dielectric strength by up to 30% and significantly improves operational reliability by preventing hot exhaust gases from entering areas with high electrical loads, ensuring effective shielding and maintaining insulating distances.
Implementation Method 1
suppressing the Coanda effect and preventing hot gases from entering heavily dielectrically stressed areas
Implementation Method 2
an exhaust gas flow guided in the opening section detaches itself from the housing attachment and can now enter the metal container as a gas jet that is radially limited to the outside
Implementation Method 3
the dielectric properties of the insulating gas in the metal container
Data Source
Figure 1~2
AI summary
The high-tension circuit breaker has a metal tank filled with insulation gas and an arcing chamber embedded in the tank. A housing (3) is aligned along an axis and an arcing contact arrangement is located in the housing. An exhaust volume is limited by the housing and an outlet channel is guided through the wall of the housing for exhaust gas (9). An electrically screened annular edge (21), which rotates around the axis, is arranged on a front side (20) of the housing mount (18), which serves to separate a flow of exhaust gas that comes out of the outlet channel from a housing mount.