Analysis of Power Transformers under Geomagnetically Induced Currents
Bibliographic record
Abstract
This paper describes the development of a low-frequency model to analyze impacts of Geomagnetically Induced Currents (GIC) on power transformers. GIC causes power transformer core and tank saturation which can conduce to flow of harmonic currents, voltage-control problems, and heating of the transformer internal components, ultimately leading to possible damages and gas relay alarm/operation. To analyze the transformer, first, an accurate low-frequency transient model is developed to allow the flow of GIC in the power transformer windings. The developed transformer transient model is based on the topological representation of the transformer core, flux air paths, and tank and is accurate enough for considering low and mid-frequency transients including GIC. The calculated currents are fed into a Finite Element Model of the transformer developed for the purpose of GIC study in this research work. Utilizing the FEM model, the pattern of electromagnetic flux distribution and hot spots caused by GIC in the transformer core and tank are specified. The extracted characteristic features of the transformer will provide helpful insights into the optimal design and production of power transformers.
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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 | 0.001 |
| 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) | 0.012 | 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".