Post on 13-Jan-2016
description
Frankfurt (Germany), 6-9 June 2011
LEONARD– CA– S1– 0176
PARTIAL DISCHARGE (PD) SNIFFER FOR WORKERS’ SAFETY INUNDERGROUND VAULTS
Hydro-Québec
Frankfurt (Germany), 6-9 June 2011
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
Contents
Frankfurt (Germany), 6-9 June 2011
Existing PD analyser - few minutes/component
LEONARD– CA– S1– 0176
Context and Design Specification
Phase sensor
PD sensor
PD sensor
Frankfurt (Germany), 6-9 June 2011
Existing PD analyser - few minutes/component Manual interpretation done by an PD expert Many components to measure in a vault
LEONARD– CA– S1– 0176
Context and Design Specification
Frankfurt (Germany), 6-9 June 2011
LEONARD– CA– S1– 0176
Context and Design Specification
Frankfurt (Germany), 6-9 June 2011
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
Context and Design Specification
Frankfurt (Germany), 6-9 June 2011
LEONARD– CA– S1– 0176
Sniffer Hardware
1 Gs/s
8
8
12 bitsResolutionDatasegment
The phase value commands the trigger enabling
External trigger through FM notch filter
Frankfurt (Germany), 6-9 June 2011
LEONARD– CA– S1– 0176
Signal processing and diagnostic
Value>0.5Then PD
Frankfurt (Germany), 6-9 June 2011
LEONARD– CA– S1– 0176
Time Domain Signal ClusteringClassic clustering Time signal clustering
Frankfurt (Germany), 6-9 June 2011
LEONARD– CA– S1– 0176
Time Domain Signal Clustering
84 segments
48 segments
Seg.1 Seg.2 Seg.3 …
Frankfurt (Germany), 6-9 June 2011
LEONARD– CA– S1– 0176
Time Domain Signal Clustering
One segment
, 1i j
j
D
r
Signature
RN
Frankfurt (Germany), 6-9 June 2011
LEONARD– CA– S1– 0176
PD mining in PRPD diagram
2D Sampling of the PRPD diagram
Frankfurt (Germany), 6-9 June 2011
LEONARD– CA– S1– 0176
Case studies
Linear scale PRPD
Log scale PRPD
Frankfurt (Germany), 6-9 June 2011
LEONARD– CA– S1– 0176
Case studies128 PD cluster (green) captured in the vicinity of a SF6 interrupter
Frankfurt (Germany), 6-9 June 2011
LEONARD– CA– S1– 0176
Case studies
Small-amplitude 251 PD cluster – Vault Blast 3 Hours later
Frankfurt (Germany), 6-9 June 2011
LEONARD– CA– S1– 0176
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