Switchgear Gas Venting Duct for Compact Arc Cooling
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Solution Overview
Problem
Existing switchgear designs struggle to meet the compactness and IAC (internal arc classification) rating requirements for IEC 62271-202 standards, particularly for outdoor applications, due to limitations in gas venting and cooling during arc events.
Innovation Solution
A switchgear duct system with at least two ducting portions, where the duct comprises an inlet and an outlet with a minimum angle of 180 degrees between the flow paths in two of the ducting portions, facilitating effective cooling and venting of gases generated during arc events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a compact switchgear design is implemented, then the dimensions are reduced to meet customer demand, but the gas venting and cooling effectiveness during arc events deteriorates
Solution Approach 1:
The duct is divided into multiple portions (first duct portion, second duct portion, third duct portion) with different orientations. Each portion handles gas flow in a specific direction, allowing the system to maintain effective venting in a compact configuration by segmenting the gas flow path into directional segments.
Solution Approach 2:
The duct system utilizes three-dimensional spatial arrangement by having duct portions extending in different directions (first direction, second direction perpendicular to first, third direction perpendicular to both). This dimensional approach allows compact packaging while maintaining sufficient gas flow path length for effective cooling and venting.
2Temperature
If the duct path length is increased to improve cooling effectiveness, then the gas cooling performance improves, but the switchgear volume increases
Solution Approach 1:
Instead of extending the duct in a single long path that would increase volume, the invention uses multi-directional duct portions that extend in different spatial directions. The first duct portion extends in a first direction, the second in a second direction, and the third in a third direction, creating a compact three-dimensional flow path that achieves sufficient cooling length without proportional volume increase.
Solution Approach 2:
The duct portions are arranged in a nested or space-efficient configuration where the second duct portion is positioned between the first and third duct portions. This nesting arrangement allows the gas flow path to fold back on itself, increasing the effective cooling path length while minimizing the overall volume occupied by the duct system.
3Device complexity
If a single-direction duct is used, then the device complexity is reduced, but the gas venting effectiveness in compact configuration deteriorates
Solution Approach 1:
The duct system is segmented into multiple portions with distinct functions and orientations. The first duct portion, second duct portion, and third duct portion each handle specific segments of the gas flow path in different directions, allowing effective three-dimensional gas venting while maintaining a relatively simple segmented structure that is easier to integrate into compact switchgear designs.
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 proposed duct system enables the provision of a compact switchgear that effectively cools and vents gases during arc events, enhancing its IAC rating and suitability for outdoor applications.
Implementation Method 1
a path formed between the inlet and the outlet to channel the generated gas through the duct, wherein a minimum angle between the path in two of the at least two ducting portions is 180 degrees
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
Disclosed herein is a switchgear duct (104) having at least two duct portions (104a, 104c). In particular, there is disclosed a system comprising a switchgear, wherein gas is generated within the switchgear during an arc event. The system also comprises a duct (104) having at least first (104a) and second (104c) portions, the duct further comprising an inlet (106) to receive the generated gas into the duct (104), wherein the inlet (106) is formed in the first portion (104a) of the duct (104), an outlet (108) to expel the generated gas from the duct (104), wherein the outlet (108) is formed in the second portion (104c) of the duct (104), and a path formed between the inlet (106) and the outlet (108) to channel the generated gas through the duct (104). A minimum angle between the path in two of the at least two ducting portions is 180 degrees.