High Speed Earthing Switch Air Blower Arc Interruption
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Solution Overview
Problem
Conventional high-speed earthing switches in gas insulated switchgear often experience interruption failures due to prolonged arcing times during the interruption process, particularly in air insulated switchgear, which can be exacerbated by the type of insulating gas used.
Innovation Solution
The integration of an air blower within the high-speed earthing switch, where a piston member is formed integrally with the mover, allows for the injection of air to the contact portion during the open state, effectively extinguishing the arc through air flow holes and plate configurations, thereby improving arc interruption performance without increasing the number of components or space occupied.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional high-speed earthing switches are used in gas insulated switchgear, then the switching speed is maintained, but interruption failure occurs due to prolonged arcing time
Solution Approach 1:
The patent extracts the air blowing function from the main earthing switch structure by using a separate piston member that moves independently within a cylinder. This piston member has air flow holes that allow air to be blown toward the contact portion, effectively removing the arc-extinguishing function as a separate mechanism while maintaining the overall switching operation.
Solution Approach 2:
The patent introduces air as an intermediary substance to extinguish the arc. The piston member blows air through air flow holes toward the contact portion where the arc occurs, using the air flow as a mediating element to accelerate arc extinction without directly modifying the contact structure or switching mechanism.
2Reliability
If an air blower is added to improve arc interruption performance, then the number of components increases, but the patent integrates it without increasing component count
Solution Approach 1:
The patent merges the air blowing mechanism with the existing earthing switch structure. The piston member is integrated into the mover assembly, and the cylinder is positioned within the enclosure space already available. The air flow holes are formed directly in the piston member, combining multiple functions (movement, air delivery, arc extinction) into a single integrated component system.
Solution Approach 2:
The piston member serves multiple functions: it acts as part of the mover mechanism for contact operation and simultaneously functions as an air blower for arc extinction. The cylinder structure provides both mechanical guidance for the piston and contains the air pressure buildup necessary for blowing air toward the contacts, achieving multi-functionality without adding separate dedicated components.
3Reliability
If the piston member is made larger to improve air blowing capability, then arc extinguishment improves, but the space occupied increases
Solution Approach 1:
The patent applies local quality by concentrating air flow capability at the critical location where it is needed most - the contact portion. The piston member includes air flow holes positioned to direct air precisely toward the contact area, and the cylinder is positioned to optimize the air delivery path. This localized air blowing approach achieves effective arc extinction without requiring a large overall piston volume.
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 solution ensures quick arc extinguishment and enhanced arc interruption performance regardless of the insulating gas type, maintaining switching speed and reliability while preventing a reduction in piston movement speed.
Implementation Method 1
a piston member that is insertedly installed in the cylinder member and moves forward and backward by receiving force from a drive unit so as to inject air inside the cylinder member to a contact portion
Data Source
AI summary
The present disclosure relates to a high speed earthing switch of a gas insulated switchgear and, more specifically, to a high speed earthing switch of a gas insulated switchgear, which includes an air blower so as to secure an improved arc interruption performance. A high speed earthing switch of a gas insulated switchgear according to an embodiment of the present disclosure comprises: an outer case; a cylinder member installed inside the outer case and having a ventilation hole formed along the lower circumferential surface; and a piston member installed to be inserted into the cylinder member, and moving backward and forward by means of a force transferred from a driving unit so as to inject air inside the cylinder member to a contact part when the cylinder member is opened.