Real-Time Performance Verification of a Commercial Transformer Differential Relay under GIC Conditions
Bibliographic record
Abstract
Transformer differential protection employs a harmonic blocking (HB) function that blocks the relay operation when harmonic levels, specifically second harmonics, in transformer differential currents are high. Such a condition can occur when a transformer experiences part-cycle core saturation caused by geomagnetically induced current (GIC). Offline studies on transformer differential relays in the literature show that these relays are likely to remain blocked by the HB function for in-zone faults during the GIC. In this paper, hardware-in-the-loop (HIL) tests are conducted to analyze the response of a commercial differential relay to the faults during the GIC. The experimental results show that the relay fails to operate for in-zone faults during the GIC, regardless of the configuration of the employed HB function. This study concludes that the performance of the existing commercial relays should be experimentally verified and proposes a solution to immunize the transformer protection schemes against GIC consequences.
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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 | 0.002 |
| Meta-epidemiology (narrow) | 0.001 | 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 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".