Applications of Distance Protection Schemes for a Forked Inter-Tie between Industrial Cogeneration and a Large Utility: Tips, Tricks and Traps
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Bibliographic record
Abstract
This paper describes an experience with the application of distance protective relaying schemes, where a cogeneration facility is added to an existing industrial plant. The single contingency inter-tie between the industrial plant and a third party utility is modified to allow bi-directional power flow and isolation (islanding) if required. Within the industrial complex boundary, state-of the-art, modern, multi-stage, numerical distance relays are utilized to provide a fast, reliable and stable protection scheme for the plant's short, high voltage transmission line. There are two competing objectives that the Industrial Engineer must balance for the integrated system to function properly. On one hand, the integrated protection system must be fast enough, under fault conditions near the co- generation facilities, to isolate and protect the equipment and avoid generator instability. On the other hand, the protection system must be stable and secure to prevent nuisance tripping and to insure islanding for continued plant operation post event. The protection scheme is further complicated by the forked inter- tie arrangement. Selection, setting and coordination between the plant and utility protection scheme provide for an interesting case study from an industrial protection engineering point of view. The challenge is in studying, adapting, coordinating, setting and de-bugging the integrated protection scheme for both sides of the inter-tie. It requires cooperation of the utility and must fulfill both safety and operation requirements.
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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 it