Proceedings ArticleDOI
The static electrification phenomena in power transformers
Dan W. Crofts
- Vol. 23, Iss: 1, pp 137-146
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In this article, the authors present several failures of large power transformers attributed to the static electrification phenomena that have been brought to the attention of Texas Power & Light Company, two of these failures were ours.Abstract:
Since December of 1983, there have been several failures of large power transformers attributed to the static electrification phenomena that have been brought to the attention of Texas Power & Light Company. Two of these failures were ours. Prior to December of 1983, numerical statistics describing failures from static electrification are apparently not readily accessible. IEEE and other reference literature addressed the phenomena, but the magnitude of the problem cannot be quantified in terms of numbers of failures.read more
Citations
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Journal ArticleDOI
Tracking and surface discharge at the oilߝpressboard interface
TL;DR: A different approach to the study of surface tracking reveals a new view of the oil-pressboard interface and suggests a link between the electric double layer and the boundary layer as discussed by the authors.
Journal ArticleDOI
Fluid electrification measurements of transformer pressboard/oil insulation in a Couette charger
TL;DR: In this paper, a Couette charger was built to simulate flow electrification processes in transformers where transformer oil filled the annulus between coaxial cylindrical electrodes, and a charge injection model was refined to examine the migration of double layer and injected charge in the imposed sinusoidally timevarying electric field.
Journal ArticleDOI
The electrification phenomena in power transformers
TL;DR: In this paper, the failure of large power transformers has been attributed to static electrification phenomena since December 1983, and methods for identifying problem units and for reducing static electricity are discussed.
Journal ArticleDOI
An assessment of the physical basis for the application of design criteria for dielectric structures
TL;DR: In this article, the use of design criteria for assessing the stresses to which composite dielectric structures are subjected implies careful and informed application, and the convention required in the application of these criteria is examined in the light of the physical processes expected in an oil/cellulose transformer structure and related to an equivalent stressed-oil-volume theory of breakdown.
Journal ArticleDOI
The measurement of charge on single particles in transformer oil
TL;DR: The role of particles in the breakdown of insulating oils by studying the motion of a single stainless steel ball as it transfers charge in an oscillatory manner between two DC planar electrodes immersed in transformer oil is discussed in this article.
References
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Journal ArticleDOI
Electrostatics in Power Transformers
S. Shimizu,H. Murata,M. Honda +2 more
TL;DR: In this article, the authors investigated the streaming electrification in core type forced oil cooled power transformers, using a full-scale model transformer and various experimental models, and clarified that streaming electrical discharge occurs when the amount of local charge exceeds a certain limit.
Journal ArticleDOI
Static Electrification and Partial Discharges Caused by Oil Flow in Forced Oil Cooled Core Type Transformers
TL;DR: In this paper, the authors investigated the conditions of occurrence of partial discharges which are caused by electrostatic charges in forced oil cooled core type transformers which are hereinafter called transformers.
Journal ArticleDOI
Static Electrification by Forced Oil Flow in Large Power Transformer
TL;DR: In this article, the static charge separation by the flow of oil can possibly exceed the dielectric strength of oil to produce a discharge in oil, and the important factors in the streaming electrification and the precautions for static charge problem are discussed.