An Analytical Method to Calculate Critical Clearance Time of Symmetrical Voltage Sags for Induction Motors
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Bibliographic record
Abstract
In allusion to induction motor stalling due to protection actions easily triggered by voltage sags,an analytical algorithm to fast calculate the critical clearance time of symmetrical voltage sags for induction motors is proposed.Based on the concept of intersection points of stable equilibrium and unstable equilibrium between electromagnetic torque-slip curve and mechanical torque-slip curve of induction motor and the steady state equivalent circuit of induction motor,the first-order differential motion equation of the motor is turn into an analytical time-slip function.Besides,an algorithm to judge whether the symmetrical voltage sag is absolutely safe is put forward.The effectiveness of the proposed method is validated by the results of electromagnetic transient simulations.The proposed analytical algorithm contributes to implement the intelligent protection for induction motors and decrease the probability of unnecessary stalling of induction motors.
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
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Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
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