Space charge evolution in XLPE and EPR under high uniform electric fields
Bibliographic record
Abstract
Evolution of a space charge with time of electric field application is investigated in cross-linked polyethylene (XLPE) and ethylene propylene rubber (EPR) subjected to uniform AC and DC fields of /spl sim/60 kV/mm. To simulate the insulation of polymeric high voltage cables the specimens were equipped with semicon electrodes. In order to minimize the effect of the amount of space charge variation between various specimens of the same material prior to aging, single specimens were subjected to a repetitive series of voltage aging for a predetermined period of time and space charge distribution measurements. The Thermal Step Method was used to measure the space charge distribution. During DC aging EPR insulation accumulates significantly more space charge than XLPE. Heterocharges are formed in EPR and homocharges in XLPE. Local electric fields created in the insulation by the accumulated space charge can be significant. AC aging generates comparable amount of space charge in both materials, which is significantly less than the amount of charge measured after DC aging.
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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 | 0.000 | 0.001 |
| 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) | 0.001 | 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".