Analysis of a Direct Lightning Impact on a Substation and its Protection Equipment
Bibliographic record
Abstract
This paper examines electromagnetic field effects inside a substation when lightning hits a transmission tower located just outside a substation. An integral formulation of Maxwell's equations is used to model the whole structure including power line, towers, grounding network, control cables, shielding system and lightning channel. Computations are carried out using the Method of Moments (MoM) for surface-wire integral equation in a stratified medium. This paper focuses exclusively on transient voltage and current stresses that appear mainly because of significant ground potential difference (GPD) between conductors and cables and surrounding grounded structures. The currents flow along cable wires and shields and voltages appear across a wire of an unshielded or shielded cable and a nearby metallic grounded panel or cable shield. Such currents and voltages are a critical reference or indicator of the vulnerability of control cables to transient surges. The voltage and current stresses along a subset of the substation control cables that may result in possible damages because of a nearby lightning strike are computed accurately based on a realistic complete model of the substation and the surrounding electric network. Various scenarios are considered based on the same cable topology and the effectiveness of each scenario in reducing current and voltage stresses are discussed. This exact computation analysis can help develop more appropriate standards and mitigation measures to prevent most severe, lightning strikes in a well-designed substation, resulting in significant economical savings in outages avoidance and equipment damages.
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 | 0.000 | 0.001 |
| 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 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".