UHF Measurement of Partial Discharge on Stator Bars Using Patch Antennas
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Bibliographic record
Abstract
Compared with other methods, there is limited research on the measurement of partial discharges (PD) in rotating machine windings using antenna-based UHF techniques. In this work, to investigate the value of measuring winding PD at higher frequencies, we designed and fabricated three patch antennas operating at 900, 1500, and 2450 MHz. The antennas are used to perform UHF PD measurements on single rotating machine bars rated at 13.8 kV. Measurements were performed in a laboratory with the specimens placed in grounded dummy stator slots. PD was produced by over-stressing the test specimens with a PD-free high voltage test set, and also by shorting out stress control region(s) using semi-conductive tape. The UHF PRPD patterns were compared to those from measurements on the same specimen with a VHF commercial instrument. It was clearly shown that PD can be measured with UHF patch antennas, despite some disagreement between UHF and VHF PRPD patterns.
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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) | 0.000 | 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 it