AC Breakdown Characteristics of Nomex and Kapton as Insulation Material Used in Pancake Tape Coil Structure for Resistive-Type Superconducting Fault Current Limiter
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Bibliographic record
Abstract
A resistive-type superconducting fault current limiter (SFCL) is one of the most promising superconducting devices in an electrical power system. However, an SFCL has the very obvious disadvantage of a large space requirement when applied in high-voltage-level power networks. Considering the space utilization efficiency, a pancake structure in which superconducting tapes are wound into coils should be adopted. When certain faults occur in a power grid, a relatively high voltage difference will be present in the tape coil. The inner and outer layers are in direct contact; therefore, special measures have to be carried out to overcome high-voltage insulation safety issues. Two commonly used materials are considered in this study: Nomex and Kapton. The basic AC breakdown characteristics in air and liquid nitrogen are explored. A new breakdown-strength testing platform is manufactured to obtain the breakdown voltage. Considering that the edges of the superconducting tape are very thin, the impact of the superconducting-tape thickness on the breakdown strength is explored. Two methods, parallel and vertical lapping, are used to lap the insulation layer onto the tape and are subsequently compared. Finally, a face-to-face electrode structure breakdown test is conducted to simulate the actual working conditions in a tape coil. The results obtained can be used to design and optimize the geometrical structure of the SFCL pancake component.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it