Investigation of rotor hotspot temperature using Fiber Bragg Gratings
Bibliographic record
Abstract
Outward migration of the turn insulations of several poles was observed on every generators in one of Hydro-Québec's power plant and was attributed to thermomechanical stresses. The concern for these rotors is more related to consequences of such degradation and to decide what should be the next course of action considering that the units have been operating for just over thirty years out of 50 years of expected life. If shorted turns start to occur and cause magnetic, thermal or mechanical problems, this may lead to unplanned outage. A prudent alternative would be to re-insulate the poles from class-B to class-F insulation. However, since the actual hotspot temperature is not known and could be above the 155°C of maximum for class-F insulation, the problem could manifest itself again. Therefore, determination of the hotspot temperature was the primary goal of this investigation. Fiber Bragg Gratings (FBG) were used in conjunction with an optical rotating joint to carried out measurements of four of the poles of one unit in the plant. The results of this investigation are presented, highlighting the benefits of carrying localized on-line rotor temperature measurements.
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How this classification was reachedexpand
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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, 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".