A novel approach for extracting information about the insulation integrity of a dielectric from Partial Discharge (PD) signals is described. The approach is based upon chromatic methodologies and involves addressing PD signals with three processors having non-orthogonal (overlapping) responses. The outputs of the three processors are transformed into a number of chromatic parameters designated x, y, z and H, L, S. x, y, z represent the proportion of the signal from each of the three processors. H, L, S represent respectively the dominant phase, effective strength and notional spread of the PD signals. A range of Partial Discharge signals obtained by various researchers worldwide have been analysed using the chromatic approach. These include investigations on various dielectrics (epoxy resins, impregnated oil, Perspex ... etc) which exhibited complete insulation breakdown, as well as PD signals generated from different PD sources have been analysed using the approach. Changes in the values of the chromatic parameters are shown to reflect various PD trends and to provide early indications of incipient insulation failure and PD source discrimination. The approach provides a high degree of traceability in relating the chromatic parameters to the raw PD signals
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:569202 |
| Date | January 2012 |
| Creators | Ragaa, Mohamed |
| Publisher | University of Liverpool |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
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