Progress in American Superconductor’s HTS wire and optimization for fault current limiting systems
| Autor: | Alexis P. Malozemoff |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Superconductivity
Materials science Dielectric strength Nuclear engineering Energy Engineering and Power Technology 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics Fault (power engineering) 01 natural sciences Electronic Optical and Magnetic Materials Power (physics) Conductor 0103 physical sciences Limit (music) Fault current limiter Electrical and Electronic Engineering 010306 general physics 0210 nano-technology Current density |
| Zdroj: | Physica C: Superconductivity and its Applications. 530:65-67 |
| ISSN: | 0921-4534 |
| DOI: | 10.1016/j.physc.2016.03.017 |
| Popis: | American Superconductor has developed composite coated conductor tape-shaped wires using high temperature superconductor (HTS) on a flexible substrate with laminated metal stabilizer. Such wires enable many applications, each requiring specific optimization. For example, coils for HTS rotating machinery require increased current density J at 25–50 K. A collaboration with Argonne, Brookhaven and Los Alamos National Laboratories and several universities has increased J using an optimized combination of precipitates and ion irradiation defects in the HTS. Major commercial opportunities also exist to enhance electric power grid resiliency by linking substations with distribution-voltage HTS power cables [10]. Such links provide alternative power sources if one substation's transmission-voltage power is compromised. But they must also limit fault currents which would otherwise be increased by such distribution-level links. This can be done in an HTS cable, exploiting the superconductor-to-resistive transition when current exceeds the wires’ critical J. A key insight is that such transitions are usually nonuniform; so the wire must be designed to prevent localized hot spots from damaging the wire or even generating gas bubbles in the cable causing dielectric breakdown. Analysis shows that local heating can be minimized by increasing the composite tape's total thickness, decreasing its total resistance in the normal state and decreasing its critical J. This conflicts with other desirable wire characteristics. Optimization of these conflicting requirements is discussed. |
| Databáze: | OpenAIRE |
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