Comparative evaluation of various grading systems for electric machinery stator windings
Bibliographic record
Abstract
The surface potential characteristics of grading systems of various lengths and configurations used for medium voltage form-wound stator coils have been examined. The grading material used in this investigation was woven polyester fabric tape loaded with a varnish containing a semi-conductive silicon carbide filler. Form-wound stator coils for a machine rating of 13.8 kV (line-to-line) were manufactured. Stress grading tape was applied to the coils using two lapping configurations and with two overall lengths. All sample coils then received a vacuum pressure impregnation (VPI) treatment. The surface field distribution in the stress grading regions of the sample coils was measured at test voltages of 8 kV and 14 kVrms. In addition, the temperature profiles of the grading systems were recorded at applied voltages up to 28.6 kVrms. The experimental results revealed that the stress grading tape lapping configuration has an influence on the field distribution to some degree; however, little or no effect was observed on the field dependent property when the grading length in the endarm region was increased.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| 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) | 0.001 | 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".