Experience with electrical testing of aerial devices for use at 69–500 kv
Bibliographic record
Abstract
Since 1982 Manitoba Hydro has been making periodic electrical tests on the booms of aerial devices used by live line crews at 69 - 230 kV. In 1992 the test voltages were increased to allow use of the booms at 500 kVdc. At that time the importance of appropriate cleaning and recoating of the booms was emphasized. In 1997 and again in 2002 a FRP hot stick flashed over during live line work from a structure at 500 kVac. The related investigations and testing were initially focused on the FRP hot sticks, but were extended to include the booms of aerial devices. A flashover mechanism termed a “fast flashover” was identified which can occur without prior leakage current and at relative humidity as low as 53% when the FRP surface is stressed with direct voltage of negative polarity. While corrective measures have been identified for the FRP hot sticks, work continues to address the reliability of booms for use at 500 kVdc.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.002 | 0.003 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.007 | 0.002 |
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".