Gas Switch Exhaust Cooling Rods for Alternative Insulation Gases
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Solution Overview
Problem
Existing electrical switching devices using alternative insulation gases like CO2 require improved insulating gas cooling concepts to manage higher gas temperatures and maintain efficient dielectric interruption performance while keeping enclosure size similar to SF6 devices.
Innovation Solution
An electrical switching device with an array of additively manufactured cooling rods positioned within the exhaust volume, perpendicular to the gas flow, to enhance heat transfer and cool hot gases effectively, using materials like stainless steel, titanium, or ceramics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional switch housing design is used, then the device structure is simple, but the housing becomes loose and allows contaminants to enter over time
Solution Approach 1:
The housing is divided into a first housing portion and a second housing portion that can be separately assembled. This segmentation allows each portion to be independently manufactured and fitted with sealing elements, improving seal integrity while maintaining manufacturing simplicity.
Solution Approach 2:
A sealing element is introduced as an intermediary component between the first and second housing portions. This sealing element prevents contaminant ingress while allowing the housing structure to remain relatively simple and easy to manufacture.
2Reliability
If the switching device is exposed to contaminants, then the switching element can become contaminated, but adding protective measures increases device complexity
Solution Approach 1:
The housing is designed with integrated sealing features and a sealing element that proactively prevents contaminant access to the switching element before contamination can occur. This preliminary protective action maintains reliability without requiring complex protective mechanisms.
Solution Approach 2:
The sealing element acts as an intermediary barrier between the external environment and the switching element, preventing direct contact with contaminants while maintaining a simple overall device structure.
3Reliability
If the housing is made from a single piece of material, then manufacturing is simple, but the housing becomes loose over time
Solution Approach 1:
The housing is segmented into multiple portions that can be manufactured separately and assembled together with sealing elements. This segmentation improves housing tightness and reliability while maintaining ease of manufacture through modular construction.
Solution Approach 2:
The housing system combines multiple material components including the first housing portion, second housing portion, and sealing element. This composite structure improves tightness and reliability while allowing each component to be manufactured using appropriate processes.
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 limits exhaust temperatures below 2500 K, maintains similar enclosure size, and reduces costs, enabling similar bay width and performance as SF6 devices, while using CO2 or C4-FN gases.
Implementation Method 1
a sealing element (40) received within a groove (33) of the first housing portion (20)
Data Source
Figure 1
Figure 2
AI summary
The invention relates to an electrical switching device comprising a longitudinal enclosure (1) filled with an insulating gas for forming an interrupting chamber (2) having a longitudinal axis (3), whereby the enclosure (1) comprises an arcing volume (4), two arcing contacts (5), a blown device (6) for blowing the insulating gas to the arcing volume (4) to extinguish an arc generated during breaking operations by electrical arcing between the two arcing contacts (5) and an exhaust volume (7) connected to the arcing volume (4) for cooling hot gases generated during the breaking operations, and the exhaust volume (7) comprises an array (8) of distantly positioned and additively manufactured cooling rods (9), which are arranged within the exhaust volume (7) perpendicular to a gas flow of the hot gases.