Overcurrent experiments on HTS tape and cable conductor

Overcurrents in the power grid can have a magnitude of up to 20 times or higher than the rated current. This may cause problems and permanent damage to electrical equipment in the grid. High temperature superconducting (HTS) tapes are known to be sensitive to currents much larger than their critical...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2001-03, Vol.11 (1), p.1781-1784
Main Authors: Jensen, K.H., Traeholt, C., Veje, E., Daumling, M., Rasmussen, C.N., Willen, D.W.A., Tonnesen, O.
Format: Article
Language:English
Subjects:
Applied sciences
Cables
Conductors
Conductors (devices)
Critical current
Damage
Dynamic tests
Electric connection. Cables. Wiring
Electrical engineering. Electrical power engineering
Exact sciences and technology
Experiments
High temperature superconductors
Overcurrent
Power grids
Studies
Superconducting cables
Superconducting films
Superconducting tapes
Superconducting transmission lines
Superconductivity
Temperature measurement
Temperature sensors
Various equipment and components
Voltage
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Summary:Overcurrents in the power grid can have a magnitude of up to 20 times or higher than the rated current. This may cause problems and permanent damage to electrical equipment in the grid. High temperature superconducting (HTS) tapes are known to be sensitive to currents much larger than their critical current. In this light, it is important to investigate the response of HTS tapes and cable conductors to overcurrents several times the critical current. A number of experiments have been performed on HTS tapes and cable conductors, with currents up to 20 times the critical current. During overcurrent experiments, the voltage, and the temperature were measured as functions of time in order to investigate the dynamic behavior of the HTS tape and cable conductor. After each experiment, damage to the superconductors was assessed by measuring the critical current. Preliminary results show that within seconds an HTS tape (critical current=17 A) heats above room temperature with an overcurrent larger than 140 A. Similar overcurrent experiments showed that a HTS cable conductor could sustain damage with overcurrents exceeding 10 times the critical current of the cable conductor.
ISSN:1051-8223
1558-2515
DOI:10.1109/77.920130