NDLI: Evaluation of the Degradation of Generator Stator Ground Wall Insulation Under Multistresses Aging

Content Provider	IEEE Xplore Digital Library
Author	Zhidong Jia Xiang Peng Zhicheng Guan Liming Wang Bo Yue
Copyright Year	1986
Abstract	The actual stator bars of an 18 kV/300 MW generator were used for accelerated multistress aging tests to investigate the degradation of ground insulation. An aging system with combined stresses including thermal, electrical, mechanical vibration, and thermomechanical factors was used to test the aging of stator bar specimens. The nondestructive parameters including partial discharge (PD) quantities and dissipation factor parameters were measured during aging test in order to evaluate the degradation of stator ground wall insulation. At the end of the aging test, an AC breakdown test was performed on the bars in order to obtain the remaining breakdown voltage (BDV) after their nondestructive data had been measured. The changes of nondestructive parameters indicated that the degradation of ground wall insulation. For example, the changes of skewness of indicated the shape of voids in ground insulation changes from flat to narrow, and even exhibits treeing, which is dangerous to insulation because it shortens the effective distance of insulation between high voltage and the ground. The results obtained are summarized as follows. The BDV data fit a Weibull distribution. The correlation between the dissipation factor, the PD parameters, and the breakdown voltage were analyzed, among which the skewness of the average discharge had the most correlation with breakdown voltage.
Sponsorship	IEEE Power Engineering Society
Starting Page	474
Ending Page	483
Page Count	10
File Size	663016
File Format	PDF
ISSN	08858969
Volume Number	23
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Thermal degradation Partial discharges Nondestructive testing Insulation testing Thermal stresses Stator bars Accelerated aging Life estimation Thermal factors Vibrations partial discharge (PD) quantity Aging breakdown voltage (BDV) correlation discharge dissipation factor generator ground wall insulation multi-stress nondestructive
Content Type	Text
Resource Type	Article
Subject	Energy Engineering and Power Technology Electrical and Electronic Engineering

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