Superconducting Supply Line Current Limiting via Coil-Induced Quench
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Solution Overview
Problem
Existing superconducting electrical supply networks in aircraft face instability due to low impedance, lack of adaptable fault protection, and irreversible current cutoffs, posing risks to system integrity and stability.
Innovation Solution
A control method and circuit for superconducting electrical supply lines that dynamically regulate current by generating a magnetic field with a superconducting coil when current thresholds are exceeded, allowing reversible current limitation and optional break zones to prevent quench phenomena.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If superconducting cables with zero resistivity are used, then energy loss is reduced, but network stability deteriorates due to low impedance
Solution Approach 1:
A control circuit is introduced as an intermediary device between the superconducting power source and the load. This control circuit continuously monitors current levels and actively regulates them, mediating the interaction between the zero-resistance superconducting cables and the electrical load to prevent instability while maintaining energy efficiency.
Solution Approach 2:
The control circuit implements a feedback mechanism by continuously measuring the current flowing through the superconducting cable and comparing it against predetermined threshold values. Based on this feedback, the control circuit dynamically adjusts its output to maintain current within safe operating limits, thereby stabilizing the network while preserving the low energy loss characteristics of superconducting materials.
2Reliability
If fault current limiters with calibrated characteristics are used, then current protection is provided, but adaptability to specific conditions deteriorates
Solution Approach 1:
The control circuit transitions from static, pre-calibrated current limitation characteristics to dynamic, real-time current regulation. The circuit continuously adapts its current limiting behavior based on actual operating conditions, load requirements, and system state, enabling it to provide reliable protection while being highly adaptable to varying specific conditions during operation.
3Reliability
If superconducting coil generates magnetic field for current control, then current limitation is achieved, but device complexity increases
Solution Approach 1:
The invention replaces complex mechanical or electronic circuitry-based current limiting devices with a superconducting coil that generates magnetic fields to control current. This substitution leverages fundamental electromagnetic principles to achieve current limitation through field interaction rather than through complex physical switching or resistive elements, thereby achieving reliable current control while potentially reducing overall system complexity.
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
Enhances stability and safety of superconducting electrical supply lines by dynamically controlling current and preventing excessive energy dissipation, adapting to fault conditions and maintaining network integrity.
Implementation Method 1
generating a current, referred to as the second current, in a superconducting coil arranged in the vicinity of said superconducting electrical supply line and configured to emit a magnetic field
Implementation Method 2
a superconducting electrical supply line configured to receive said magnetic field
Data Source
AI summary
A method for controlling a superconducting electrical supply line that is carried out in a control circuit obtains a piece of information representative of a first electric current in the superconducting electrical supply line, then, when the piece of information representative of a first electric current is greater than or equal to a first predetermined threshold value, generates a current, referred to as the second current, in a superconducting coil arranged in the vicinity of the supply line, the value of the second current being determined on the basis of the piece of information representative of the first current. A control circuit is configured to implement the method. Current limiter functions are reversibly performed by initiating a quench phenomenon in the superconducting electrical supply line.