Superconducting Wire Quench Detection via Thermal Coupling
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Solution Overview
Problem
High-temperature superconducting materials pose challenges in detecting quench events due to low quench propagation speeds, increasing the risk of burnout from local hot spots, as opposed to low-temperature superconductors which can detect hot spots more rapidly.
Innovation Solution
Incorporating a second superconducting wire thermally coupled to the first wire but electrically isolated, operated near its critical surface to rapidly transition to a non-superconducting state upon receiving thermal energy from the first wire, with a higher quench propagation speed than the first wire, and equipped with a detector to monitor this transition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If high-temperature superconducting materials are used, then operating temperature is improved, but quench propagation speed deteriorates
Solution Approach 1:
A low-temperature superconducting wire is introduced as an intermediary element between the hot spot and the detection system. This mediator wire, having faster quench propagation characteristics, rapidly transmits the thermal disturbance from the HTS wire, enabling timely detection despite the inherently slow quench propagation in high-temperature superconducting materials.
2Temperature
If high-temperature superconducting materials are used, then critical temperature is improved, but detection capability deteriorates
Solution Approach 1:
The low-temperature superconducting wire serves as a detection intermediary that translates the slow thermal propagation in HTS materials into rapid detectable signals. When a hot spot forms in the HTS wire, the thermal energy is conducted to the LTS wire which quickly transitions to a normal state, generating a detectable voltage signal that indicates the quench event.
Solution Approach 2:
The system changes the detection parameter from directly monitoring the slow thermal propagation in HTS wire to monitoring the rapid electrical transition in LTS wire. By operating the LTS wire near its critical current, small thermal disturbances from the HTS wire cause large, easily detectable changes in electrical properties of the LTS wire.
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
Enables quick detection of quench events in high-temperature superconducting materials, preventing damage by allowing for timely quench protection procedures, even in cases where quench propagation is slow.
Implementation Method 1
a second superconducting wire, thermally coupled to and electrically isolated from the first superconducting wire
Implementation Method 2
The second superconducting wire is configured to conduct a second current in a superconducting state below, but sufficiently near its critical surface to be quenched to a non-superconducting state upon conduction of sufficient thermal energy from the first superconducting wire
Data Source
AI summary
A superconducting device includes a first superconducting wire configured to carry a first current in a superconducting state, and to generate thermal energy upon occurrence of a hot spot during conduction. The device includes a second superconducting wire, thermally coupled to and electrically isolated from the first superconducting wire. The second superconducting wire is configured to conduct a second current in a superconducting state below, but sufficiently near its critical surface to be quenched to a non-superconducting state upon conduction of the thermal energy from the first superconducting wire.