NDLI: Optimisation of a numerical model for analysis of partial discharge phenomena in a flat cavity

Content Provider	IEEE Xplore Digital Library
Author	Candela, R. Schifani, R. Romano, P.
Copyright Year	2001
Description	Author affiliation: Dipt. di Ingegneria Elettrica, Palermo Univ., Italy (Candela, R.)
Abstract	The failure probability of the insulation in HV components can be studied through partial discharge (PD) measurements to detect defects. A numerical model, previously developed by the authors for the simulation of PD activity in a spherical void embedded in epoxy resin, is implemented for a flat cavity under a divergent electric field. This simulates very well the real working conditions encountered in the insulation of electrical machines. The model is developed taking into account all the geometric and electrical parameters, and a fine examination on physical parameters playing a fundamental role on the PD phenomenon is carried out. In particular, a more accurate formulation of the work function and a finite elements analysis (FEA) of the electric field inside the cavity has been applied. A new approach is investigated to reproduce the uncertainty of the discharge phenomenon. A probability function distribution, obtained by Weibull analysis, gains the best results. In order to obtain the best fitting of the model output to the experimental PD data, a strong procedure based on an heuristic algorithm is performed. This algorithm detects the minimum of a quality function that evaluates the distance between the PD patterns of the numerical model and of the experimental data. After a description of the numerical model adopted, a comparison between the experimental and the simulated data are presented together with comments and remarks.
Starting Page	689
Ending Page	692
File Size	514245
Page Count	4
File Format	PDF
ISBN	0780370538
DOI	10.1109/CEIDP.2001.963639
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-10-14
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Numerical models Partial discharges Partial discharge measurement Epoxy resins Employee welfare Dielectrics and electrical insulation Solid modeling Finite element methods Uncertainty Heuristic algorithms
Content Type	Text
Resource Type	Article

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