HVDC Contactor Isolation Using Reusable Arc Prevention Elements
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Solution Overview
Problem
Existing contactor systems in aerospace power distribution face challenges in preventing arcing during short circuit events, particularly due to the formation of high-energy arcs across main contacts, and current fail-safes like fuses are one-time use and require replacement.
Innovation Solution
A mechanical or solid-state contactor system with insulated arc prevention elements, controlled by a contactor controller, that moves between contactor portions to prevent arcing, which can be reused and does not need replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional fuses or pyrofuses are used to prevent arcing during short circuit events, then arc protection is provided, but the devices are one-time use and require replacement after activation
Solution Approach 1:
The arc prevention element is designed to be reusable and automatically resettable. After a short circuit event, the element can be repositioned back to its original state without requiring replacement, allowing the system to serve itself by restoring protective functionality through simple repositioning rather than component replacement
Solution Approach 2:
The arc prevention element transitions between different positional states - normally positioned during operation and repositioned during arc prevention. This dynamic repositioning capability allows the same physical element to serve multiple functions over time, eliminating the need for single-use disposable components
2Reliability
If fuses are installed in-line with contactors to ensure arc extinguishment, then arc protection is achieved, but system complexity increases due to additional components
Solution Approach 1:
The arc prevention element serves multiple functions: it acts as a protective barrier during short circuits, maintains normal system operation when not activated, and can be reused across multiple events. This multi-functionality reduces the need for separate dedicated components for each protective function
Solution Approach 2:
The arc prevention element is integrated with the contactor structure rather than being a completely separate in-line component. By combining the arc prevention functionality with the existing contactor assembly, the system reduces overall component count and simplifies the architectural layout
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
Effectively reduces or eliminates arcing during short circuits, ensuring reliable operation without the need for replacing arc prevention components.
Implementation Method 1
A mechanical or solid-state contactor system with insulated arc prevention elements, controlled by a contactor controller, that moves between contactor portions to prevent arcing
Data Source
AI summary
A high voltage DC contactor control system. The system reduces/eliminates arcing in in contactors and includes a short circuit protection system operably connected to the drive voltage configured to reducing arcing between portions of the contactor. The short circuit protection system includes a first arc prevention element and a first arc prevention driver configured to cause the first arc prevention element to be disposed between the first and second portions of the first contactor to prevent arcing between them.