NDLI: Comparison of four methods for computing positive-sequence reactances of three-phase core-type transformers

Content Provider	IET Digital Library
Author	Sorrentino, Elmer Alvarado, Sofía Silva, Pedro Burgos, Juan Carlos
Abstract	This study compares four methods for computing the positive-sequence reactances of three-phase core-type transformers: traditional basic formulae (TBF); two-dimensional (2D) finite difference method (FDM); and 2D and 3D finite element methods (FEM). A computer program was coded for the FDM, and a commercial software was applied for the FEM. The four applied methods are magnetostatic, and they were applied for computing the three positive-sequence short-circuit reactances of a three-winding transformer. The results of these methods were compared among themselves and with the measured values. In comparison with the measured values: (a) the TBF are relatively accurate, although they are based on an approximate representation of a simple 2D cross-section for the transformer window; (b) the results with different 2D cross-sections are also relatively accurate; (c) the results with the 3D modelling are more accurate than the TBF. These facts confirm that the space between the windings determines the value of the transformer positive-sequence reactance. Therefore the tank-winding distance and the tank magnetic permeability have little effect on the results. A weighted average of the results of different 2D cross-sections was computed with the FDM and with the FEM, and the obtained values are very close to the result with the 3D modelling. Although the results are relatively accurate, the main simplifications related to the performed magnetostatic analysis are highlighted.
Starting Page	1221
Ending Page	1227
Page Count	7
ISSN	17518687
Volume Number	8
e-ISSN	17518695
Issue Number	Issue 7, Jul (2014)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/8/7
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2013.0834
Journal	IET Generation, Transmission & Distribution
Publisher Date	2014-02-19
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	2D Cross-section 2D Finite Element Methods 3D Finite Element Methods 3D Modelling Approximate Representation Commercial Software Differential Equation (numerical Analysis) Electric Reactance Finite Difference Method Finite Element Analysis Graphics Technique Magnetostatic Positive-sequence Reactance Power Engineering Computing Power Transformer Solid Modelling Tank Magnetic Permeability Tank-winding Distance Three-phase Core-type Transformer Three-winding Transformer Traditional Basic Formulae Transformer And Reactors Two-dimensional Finite Difference Method
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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