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LEONARD– CA– S1– 0176

PARTIAL DISCHARGE (PD) SNIFFER FOR WORKERS’ SAFETY IN UNDERGROUND VAULTS. Hydro-Québec. LEONARD– CA– S1– 0176. Contents. Context and Design Specification Sniffer Hardware Signal Processing and Diagnostic Time Domain Signal Clustering PD mining in PRPD diagram Case studies Conclusion.

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LEONARD– CA– S1– 0176

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  1. PARTIAL DISCHARGE (PD) SNIFFER FOR WORKERS’ SAFETY IN UNDERGROUND VAULTS Hydro-Québec LEONARD– CA– S1– 0176

  2. Contents • Context and Design Specification • Sniffer Hardware • Signal Processing and Diagnostic • Time Domain Signal Clustering • PD mining in PRPD diagram • Case studies • Conclusion LEONARD– CA– S1– 0176

  3. Context and Design Specification PD sensor • Existing PD analyser - few minutes/component PD sensor Phase sensor LEONARD– CA– S1– 0176

  4. Context and Design Specification • Existing PD analyser - few minutes/component • Manual interpretation done by an PD expert • Many components to measure in a vault LEONARD– CA– S1– 0176

  5. Context and Design Specification LEONARD– CA– S1– 0176

  6. Context and Design Specification • Existing PD analyser - few minutes/component • Manual interpretation done by an PD expert • Many components to measure in a vault • Safety concern : 20 minutes exposure time • Specification: Automated diagnosis under 15 s LEONARD– CA– S1– 0176

  7. Sniffer Hardware The phase value commands the trigger enabling 8 12 bits Resolution Data segment 1 Gs/s 8 External trigger through FM notch filter LEONARD– CA– S1– 0176

  8. Signal processing and diagnostic Value>0.5 Then PD LEONARD– CA– S1– 0176

  9. Time Domain Signal Clustering Time signal clustering Classic clustering LEONARD– CA– S1– 0176

  10. Time Domain Signal Clustering Seg.1 Seg.2 Seg.3 … 84 segments 48 segments LEONARD– CA– S1– 0176

  11. One segment Signature Time Domain Signal Clustering RN LEONARD– CA– S1– 0176

  12. PD mining in PRPD diagram 2D Sampling of the PRPD diagram LEONARD– CA– S1– 0176

  13. Case studies Linear scale PRPD Log scale PRPD LEONARD– CA– S1– 0176

  14. Case studies 128 PD cluster (green) captured in the vicinity of a SF6 interrupter LEONARD– CA– S1– 0176

  15. Case studies Small-amplitude 251 PD cluster – Vault Blast 3 Hours later LEONARD– CA– S1– 0176

  16. Conclusion • Automated diagnosis is possible in the field • Wide-band probe is needed with fast ADC • Switching of analog filter bank - essential • PD mining in PRDP diagram - essential • Time clustering resolves superimposed clusters • Sniffer generated 22 real + 150 false alarms for >40 000 measurements in vaults LEONARD– CA– S1– 0176

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