Computation of power line structure surge impedances using the electromagnetic field method
Bibliographic record
Abstract
The power line structure surge impedance is computed using an electromagnetic field approach for various transmission and distribution line structure configurations (ranging from a single wood pole to lattice steel towers) including their grounding systems. The influence of the soil resistivity and different grounding system configurations on the structure surge impedance has been studied. The structure surge impedances are computed for three impressed surge current waveforms: (a) step current wave; (b) ramp current wave; and (c) typical double-exponential lightning surge current. The computed surge impedances using the electromagnetic field approach are compared with those obtained using formulae based on a geometrical model of the power line structure. It is shown that the computed values based on the electromagnetic field theory are, to various degrees, different from the values computed using the formulae based on the geometrical model of the structure. The study also reveals that: (a) the surge impedance of a lattice steel tower decreases only slightly when the soil resistivity is increased from 0.1 /spl Omega/-m to 500 /spl Omega/-m; and (b) when the footing resistance is held constant, the surge impedance of a single pole changes by about 5%, when counterpoises instead of rod clusters are used.
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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 | 0.000 |
| 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) | 0.002 | 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 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".