Preliminary Investigations on the Gassing Tendency and Breakdown strength of Low Pourpoint Transformer Liquids under Selective Conditions
Bibliographic record
Abstract
The overall performance of ester liquids is comparable to mineral insulating oils with a reduced environmental impact. However, the application of ester fluids in cold regions is still a challenge to the utilities and transformer owners. In this paper, the water behavior of three low pour point (less than −50°C) insulating liquids (two synthetic esters and a mineral oil) is reported. Non-aged and aged liquid samples underwent electrical discharges of 7 kV (as per a modified ASTM D6180) for 5 hours to understand the gassing tendency and change in water content in the liquid under corona discharges. Also, the water uptake rates of non-aged low pourpoint liquids have been verified at 60°C. Further, non-aged liquids with three different initial water contents have been subjected to 20 repeated AC breakdowns to understand the influence of water on their breakdown failure probability. The obtained results indicate that the gassing tendency under electrical stress of the investigated liquids increases with aging. Similar to the typical ester liquids, the two low pour point ester liquids have higher water saturation limit than that of the mineral oil. In addition, the breakdown failure rates of the low pour point liquids increase with increase in water content.
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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".