347/600 Volt Arc Flash Mitigation at British Columbia Hydro
Bibliographic record
Abstract
British Columbia Hydro (BC Hydro) initially approached an arc flash program development by performing engineering assessments to calculate incident energies across our power system. Due to the complexity of our 347/600 Volt distribution secondary system and the difficulty of determining site-specific details, potential incident energy ranges were determined. Use of the highest incident energy value within the ranges would have resulted in major impacts to our workers (employees and contractors) and customers. Based on this, we worked with our engineering teams to develop arc flash mitigation options that would be less impactful and used a structured decision-making [4] process to engage stakeholders. From this process we identified several options that could reduce the arc flash impact to workers and customers. This paper details how we minimized the arc rated PPE impact to our workers through the development of a 347/600 Volt, arc flash mobile application to calculate site-specific incident energy and the use of temporary insulation to reduce the probability of the arc flash occurring.
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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 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.002 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.009 | 0.001 |
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".