A comparative evaluation of various conducting slot armour materials
Bibliographic record
Abstract
The use of conducting armour media between the groundwall insulation and slot iron in large high-voltage rotating machines is required for suppression of in-slot corona during operation. To ensure continued efficient operation of high-voltage machines, the importance of maintaining an adequate degree of conductance along the length of the armour and a sufficient connection between the armour and grading materials cannot be overstated. This paper presents a discussion of the effect of operating environment on the condition of conducting slot armour, and an overview of several types of commercially available materials. An experiment to measure resistance measurements before and after vacuum pressure impregnation (VPI) for six different materials is described. Resistance is evaluated as a function of distance from the ground plane. Resistances for two of these materials were re-evaluated over a temperature range approximating that experienced by the material when in operation. Voltage endurance test results are presented for a series of bars made using two of the materials in the resistance study, including observations about deterioration under high-voltage test conditions.
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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 | 0.001 |
| 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 | 0.001 |
| 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".