A Contribution to the Frequency and Transient Analysis of High Voltage Bushings

Authors

  • Mohamed Mostafa Saied Professor (Emeritus), Independent Researcher, Giza, Cairo, Egypt (Formerly with the Electrical Engineering Department, College of Engineering and Petroleum, Kuwait University, Khaldiya, Kuwait City, State of Kuwait)

DOI:

https://doi.org/10.37591/.v9i1.1103

Abstract

The paper suggests a method for determining the frequency characteristics and transient response of capacitively graded high voltage bushings. It is based on an s-domain circuit model that describes the grading conducting foils and the insulating layers. In most cases, they are of different axial lengths. A system of simultaneous differential and algebraic equations is derived taking these differences into account. Its closed-form solution, subject to the boundary conditions, can be directly obtained in terms of parametric functions for the voltages and currents. They include both the location of the considered point and the Laplace operator s as independent variables. These expressions are used in order to identify the frequency dependence of the bushing’s input impedance as well as the types and frequencies of the different resonances. The expressions are numerically inverted into the time domain to get the voltage and current distributions. The technique is applied to different case studies demonstrating the effect of the wave shape of the source that initiates the transient and the termination of the central conductor.


Keywords: Frequency characteristics, electromagnetic transient analysis, GIS (gas-insulated switchgear), capacitively graded bushings, VFTOs (very fast transient overvoltages), non-uniform lines, parametric functions, differential equations, numerical Laplace inversion, condition monitoring.

Cite this Article

Saied Mohamed M. A Contribution to the Frequency and Transient Analysis of High Voltage Bushings. Journal of Power Electronics & Power Systems. 2019; 9(1): 15–26p.

Author Biography

  • Mohamed Mostafa Saied, Professor (Emeritus), Independent Researcher, Giza, Cairo, Egypt (Formerly with the Electrical Engineering Department, College of Engineering and Petroleum, Kuwait University, Khaldiya, Kuwait City, State of Kuwait)

    Independent Researcher, Full Professor, Electrical Engineering 

    B.Sc. , Electrical Engineering, Cairo University (1965)

    Dipl.-Ing. , Electrical Engineering, RWTH, Aachen University, Germany (1970)

    Dr.-Ing. , Electrical Engineering, RWTH, Aachen University, Germany (1974)

    Full Professor, EE, Kuwait University (1983-2009)

    Visiting Full Professor, EE, Kuwait University (1998-1099)

    Pepartment Chairman, EE, Kuwait University (2004-2009)

     

References

References:

E. Kuffel, W.S. Zaengel, J. Kuffel:” High Voltage Engineering Fundamentals” Book, Second edition”, 2000, published by Butterworth-Heinemann, Chapter 4.

S. Shriwastav, K. Swami:” Analysis of very Fast Transient over Voltages in GIS”, Journal of optical communication, MAT Journals 2017, Volume 3 Issue 2, pp.1-8.

A.Ardito R.Iorio G.Santagostino, A. Porrino: “Accurate Modeling of Capacitively Graded Bushings for the Calculation of Fast Transient Overvoltages in GIs”, IEEE Transactions on Power Delivery, vol. 7, 1992 pp. 1316-1327.

S. Yanabu, H. Murase, H. Aoyagi, H. Okubo, Y,Kawaguch:” Estimation of Fast Transient Overvoltage in Gas-Insulated Substations”, IEEE Transactions on Power Delivery, Vol. 5 ,No. 4,November 1990, pp. 1875-1882.

M. R. Hesamzadeh, N. Hosseinzadeh, P. Wolfs:” An Advanced Optimal Approach for High Voltage AC Bushing Design”, IEEE Transactions on Dielectrics and Electrical Insulation Vol. 15, No. 2; April 2008, p.467.

M. M. Rao, T. P.Rao, S. Ram B. Singh:” Simulation of Capacitively Graded Bushing for Very Fast Transients Generated in a GIS during Switching Operations”, Journal of Electrical Engineering & Technology, Vol. 3, No. 1, pp. 36~42, 2008.

A. Raghu Ram, J. Amarnath, S. Kamakshiah: ”Estimation of Very Fast Transient Overvoltages on Bushing Connected in GIS”, Intl. Journal of Engineering Science and Technology (IJEST), Vol.4, No, 02, February 2012, pp. 457-472.

Wolfram Mathematica Tutorial Collection: “ Advanced Numerical Differential Equation Solving” in Mathematica, Book, Wolfram Research, 2008, available at: the website: http://www.wolfram.com/learningcenter/tutorialcollection/AdvancedNumericalDifferentialEquationSolvingInMathematica/

E. A. Oufi A. S. AlFuhaid M. M. Saied: “Transient Analysis of Lossless Single-phase Nonuniform Transmission Lines”, IEEE Transactions on Power Delivery. Vol. 9, No. 3. July 1994, pp. 1694-1700.

Downloads

Published

2019-04-12

Issue

Vol. 9 No. 1 (2019)

Section

Research Article

License

Journal Title:

Title of the Paper:

Corresponding Author’s Information:

Name: Address:

E-mail:

Contact Number:

It is herein agreed that: The copyright to the above-listed unpublished and original article is transferred to STM Journals.

This copyright transfer covers the exclusive right to reproduce and distribute the contribution, including reprints, translations, photographic reproductions, microform, electronic form (offline, online), or any other reproductions of similar nature.

I/We declare that above manuscript is not published already in part or whole (except in the form of abstract) in any journal or magazine for private or public circulation, and, is not under consideration of publication elsewhere.

 I/ We warrant(s) that his/her/their contribution is original, except for such excerpts from copyrighted works as may be included with the permission of the copyright holder and author thereof, that it contains no libelous statements, and does not infringe on any copyright, trademark, patent, statutory right, or propriety right of others.

I/We will not publish his/her/their above said contribution anywhere else without the prior written permission of the publisher unless it has been changed substantially. I/We also agree to the authorship of the article in the following order: Author(s) Name Signature(s)

1. ________________

2. ________________

3. ________________

4. ________________

The author(s) agree to the terms of this Copyright Notice, which will apply to this submission if and when it is published by this journal (comments if any to the editor can be added below).