Segmented Absorber Elements for Switchgear Pressure Relief
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Solution Overview
Problem
Conventional absorber devices for medium-voltage switchgear are ineffective for high arc currents and require complex design measures, such as collecting ducts, which increase construction and assembly costs and the size of the switchgear.
Innovation Solution
A series connection of absorber elements with increasing flow resistance, where each element downstream has a greater flow resistance than the previous one, providing efficient pressure relief and reducing plasma or particle flow without the need for collecting channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional absorber devices are used for high arc currents, then pressure relief is provided, but effectiveness is insufficient and complex design measures (collecting ducts) are required
Solution Approach 1:
The absorber device is divided into multiple absorber elements arranged in series, each with progressively increasing flow resistance. This segmentation allows the device to effectively handle high arc currents by distributing the pressure relief function across multiple stages, eliminating the need for complex collecting ducts while maintaining high reliability.
2Reliability
If collecting ducts are installed to handle higher arc currents, then pressure relief effectiveness is improved, but construction and assembly costs increase
Solution Approach 1:
Instead of using expensive and complex collecting ducts, the invention segments the absorber function into multiple elements with progressively increasing flow resistance. This approach achieves the same pressure relief effectiveness for high arc currents while significantly reducing construction and assembly costs through a simpler, more modular design.
3Reliability
If collecting ducts are used to handle higher arc currents, then pressure relief is improved, but the size of the switchgear increases
Solution Approach 1:
The segmented absorber elements with progressive flow resistance provide effective pressure relief for high arc currents within a compact configuration. This eliminates the need for large collecting ducts, maintaining pressure relief capability while reducing the overall size of the switchgear.
4Object-generated harmful factors
If absorber elements with high flow resistance are placed at the inlet, then particle flow reduction is improved, but pressure relief of the housing becomes insufficient
Solution Approach 1:
Each absorber element is assigned a specific flow resistance value that increases progressively from inlet to outlet. The inlet elements have lower flow resistance to ensure adequate pressure relief, while downstream elements have higher flow resistance to maximize particle flow reduction. This local optimization of flow resistance at different positions resolves the contradiction between pressure relief and particle flow reduction.
Solution Approach 2:
The flow resistance parameter is changed progressively across the series of absorber elements. By increasing the flow resistance from inlet to outlet, the system achieves both adequate pressure relief at the inlet and effective particle flow reduction at the outlet, optimizing both functions simultaneously.
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 ensures effective pressure relief and reduction of hot gases and particles, preventing bursting and impermissible overpressure, while simplifying the design and reducing the size of the switchgear.
Implementation Method 1
an absorber device, which also brings about effective protection or a reduction in plasma or particle flow occurring in the event of arcing
Implementation Method 2
matching of their flow resistances to one another leads to increased effectiveness of the absorber device
Implementation Method 3
attenuated by reflection between the absorbers (loop-like reflections at both absorbers and in both directions)
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The absorber device (100) has absorber elements (110a-110c) that are arranged in series with respect to a flow direction (S). The flow resistance of absorber element (110b) is higher than flow resistance of absorber element (110a). A pressure channel (102) is provided for receiving the absorber elements. The distance (d) between two adjacent absorber elements is greater or equal to about a root of a cross-sectional area of absorber elements.