A new design tool to protect industrial long-cable PWM ASD systems against high-frequency overvoltage problems
Bibliographic record
Abstract
This work presents a new tool for use in the design of long-cable adjustable-speed drive (ASD) systems. It allows coordination between the inverter, the motor and the cable type and length in order to protect the motor against overvoltages due to the reflected wave. Detailed mathematical formulas describing the transient voltage and current along the cable are first developed in the frequency domain. Then, by applying the boundary conditions at the cable ends and assuming a lossless cable, delay equations are developed in the time domain. Using these equations, an appropriate simulation scheme is built with the SimPowerSystems (SPS) and Simulink modules of the MATLAB software environment to compute the high-frequency overvoltages (and their associated currents) at the ends of the feeding cable. The proposed tool has been applied to a 5 kVA industrial ASD prototype using a four-wire shielded long cable. The paper includes simulation results and experimental validations.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 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 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.004 | 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".