Hybrid Switchgear With Spiral Semiconductor Assembly
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Solution Overview
Problem
Current switching devices for connecting/disconnecting electrical lines to/from loads face limitations in the constructive layout and positioning of semiconductor devices, which can lead to issues such as electrical arc generation and inrush currents during operation, especially at medium voltage levels.
Innovation Solution
The proposed switching device incorporates a hybrid circuit breaker design with a rolled printed circuit board and semiconductor devices arranged in a spiral path within an insulating housing, allowing for efficient current flow and arc reduction by synchronizing the movable contact with the AC waveform, and utilizing varistors for voltage limiting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a large number of semiconductor devices are used in series to withstand medium voltage, then the voltage blocking capability is improved, but the device complexity and construction difficulty increase
Solution Approach 1:
The patent embeds the semiconductor devices within a compact insulating housing structure, nesting multiple components (semiconductor devices, varistors, connection means) in a hierarchical arrangement that maximizes space utilization and simplifies the overall construction of medium voltage switching devices
Solution Approach 2:
The patent arranges semiconductor devices in a series configuration along the current path, utilizing the dimensional arrangement of components to achieve voltage blocking capability while maintaining a compact form factor that reduces construction complexity
2Object-generated harmful factors
If the movable contact is synchronized with the AC waveform during opening operation, then electrical arc generation is reduced, but the control precision and timing accuracy requirements increase
Solution Approach 1:
The patent synchronizes the opening operation of the movable contact with the periodic zero-crossing points of the AC waveform, utilizing the natural periodicity of the alternating current to minimize electrical arc generation during contact separation
Solution Approach 2:
The patent incorporates control means that monitor the AC waveform and provide feedback to timing the opening operation of the movable contact, ensuring synchronization with the current waveform to reduce arc generation while maintaining operational reliability
3Object-generated harmful factors
If the movable contact is synchronized with the AC waveform during closing operation, then inrush current and transient voltages are limited, but the control complexity increases
Solution Approach 1:
The patent positions the movable contact to close just before the zero-crossing point of the AC waveform, performing the closing action in advance of the current peak to prevent inrush current and transient voltage generation without requiring complex real-time control
4Volume of moving object
If semiconductor devices are arranged in a compact configuration, then the device size is reduced, but the heat dissipation and electrical insulation challenges increase
Solution Approach 1:
The patent nests semiconductor devices, varistors, and connection means within a compact insulating housing, arranging components in a nested configuration that minimizes device volume while maintaining adequate spacing for heat dissipation and electrical insulation
Solution Approach 2:
The patent introduces an insulating housing as an intermediary structure that provides both mechanical support and thermal management for the semiconductor devices, enabling compact arrangement while addressing heat dissipation and insulation requirements
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 enhances the switching device's performance by reducing electrical arcs and transient voltages, enabling reliable operation across a range of voltages while maintaining a compact and standardizable form factor, suitable for medium voltage applications.
Implementation Method 1
semiconductor devices which are electrically connected in series to each other and are suitable for blocking current flowing therethrough in a blocking direction and for conducting current flowing therethrough in an allowed direction
Implementation Method 2
avoiding or at least reducing the generation of electrical arcs during the opening operation of the switching device
Implementation Method 3
utilizing varistors for voltage limiting
Data Source
Figure 1
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Figure 5
AI summary
A switching device for connecting/disconnecting a power line to/from at least an associated electrical load comprising at least a phase having a housing which houses a movable contact couplable/separable to/from a corresponding fixed contact. The phase comprises an electrically semiconducting assembly having an insulating support operatively associated with a plurality of semiconductor devices electrically connected in series to each other; the plurality of semiconductor devices is associated and electrically connected to the fixed contact and to the movable contact, wherein the assembly is configured to be installed into the housing so as to surround at least a portion of at least one of the fixed contact and the movable contact when it is coupled to the fixed contact.