Analysis of grounding grids influence on lightning generated magnetic field
Bibliographic record
Abstract
This paper proposes a realistic approach to consider the influence of grounding grids on the magnetic field inside buildings due to lightning strikes. An electromagnetic theory approach based on the method of moments is used. This method allows for a transient grounding grid analysis in both the frequency and time domains, and accounts for the effects of the soil. Calculations are performed for a simplified case where the lightning channel is modeled assuming a constant current along the channel. This approach takes radiated fields into account but neglects propagation effects. The model is selected for ease of comparisons with the examples described in the IEC 62305-4 standard. A numerical analysis is carried out to estimate the reduction of lightning-induced magnetic fields inside grid-like spatial shields typically used in reinforced concrete buildings. The influence of grounding grids and soil resistivity on the radiated magnetic field is studied. The performance of various possible grounding grids for the building is compared. Emphasis is given to the effect of the soil resistivity on the results. Major advantages and disadvantages of both analytical and numerical methods are pointed out as well.
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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 | 0.001 |
| 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) | 0.004 | 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".