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System Impacts of Temperature-Dependent Transmission Line Models

IEEE TRANSACTIONS ON POWER DELIVERY 2013年第4期28卷 2300-2308页

作者： Cecchi, Valentina Knudson, Matthew Miu, Karen Univ N Carolina Dept Elect & Comp Engn Charlotte NC 28223 USA Drexel Univ Dept Elect & Comp Engn Philadelphia PA 19104 USA

This paper discusses system-level impacts of temperature-dependent transmission line models based on given ambient temperature profiles. In order to capture nonuniformity of line parameters caused by ambient temperature gradients, a line model characterized by multiple nonuniform segments is used. An automated tool has been developed to obtain appropriate system models, given a set of temperature measurements and their locations along each system branch. Using these models, the impacts of temperature variations are investigated with respect to line terminal behavior (bus voltage) and maximum power transfer characteristics. Results for the IEEE 30-bus test system are presented.

关键词： Ambient temperature distributed parameter circuits nonuniform transmission lines power system modeling power transmission lines

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SIMULATION OF PIPELINE HOLIDAY DETECTION BY TIME DOMAIN REFLECTOMETRY

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IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS 1990年第5期26卷 961-966页

作者： PAL, ZM JOHNSTON, RH UNIV CALGARY DEPT ELECT ENGNCALGARY T2N 1N4ALBERTACANADA

An analytical electrical transmission line model for an isolated buried pipeline is developed. Elements of the transmission-line model are derived mathematically using both field and circuit theory methods. Propagation along the coated pipeline in multilayer earth is studied analytically and modeled with a computer. The performance of the transmission line is analyzed. It is shown that time-domain reflectometry may provide the pipeline operator with an electrical method for monitoring pipeline-coating integrity.< >

关键词： Pipelines Transmission line theory distributed parameter circuits Circuit simulation Transmission lines Mathematical model Circuit theory Nonhomogeneous media Earth Performance analysis

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LOG-PERIODIC TRANSMISSION LINE circuits .I. 1-PORT circuits

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IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES 1966年第6期MT14卷 264-+页

作者： DUHAMEL, RH ARMSTRONG, ME Ground Systems Group Hughes Aircraft Company Fullerton CA USA

A theoretical study of one-port log-periodic circuits consisting of a transmission line shunt loaded with open-circuit transmisson lines is reported. The objective was to determine the conditions under which the phase of the input reflection coefficient varies linearly with the logarithm of the frequency. Precise definitions and general analytical techniques for log-periodic circuits are given. Results of extensive numerical calculations are presented to illustrate the dependence of the input reflection coefficient on the various design parameters. It was found that phase deviations from linear on the order of one degree are quite easily achieved.

关键词： distributed parameter circuits Frequency Reflection Transmission line theory Microwave theory and techniques Permittivity Plasma temperature Boltzmann equation Nonuniform electric fields Anisotropic magnetoresistance

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Modal Circuit Decomposition of Lossy Multiconductor Transmission Lines

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IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES 1996年第7期44卷 1046-1056页

作者： AbuShaaban, M. Scanlan, Sean O. Univ Coll Dublin Dept Elect & Elect Engn Dublin 4 Ireland

General multi-conductor transmission lines are investigated using modal analysis. This is performed by finding the solution to the telegrapher's equations for general impedance and admittance per unit length matrices 2 and Y, respectively, and obtaining the transmission matrix in terms of 2 and Y. Hence, the modal circuit is sought, resulting in a cascade of two n-port ideal transformers and n uncoupled transmission lines. A set of necessary and sufficient conditions are established and a construction method is given if the conditions are satisfied. It is shown that the modal circuit will always exist for general homogeneous constant parameters and for the nonhomogeneous case under the quasi-TEM assumption the existence depends on the geometry. The modal circuit is extended for frequency dependent parameters and a set of sufficient conditions are given.

关键词： Propagation losses Transmission line matrix methods distributed parameter circuits Matrix decomposition Sufficient conditions Multiconductor transmission lines Modal analysis Equations Impedance Admittance

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DESIGN OF TRANSFORMERLESS QUASI-BROAD-BAND MATCHING NETWORKS FOR LUMPED COMPLEX LOADS USING NONUNIFORM TRANSMISSION-LINES

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IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES 1988年第4期36卷 629-634页

作者： ENDO, I NEMOTO, Y SATO, R TOHOKU GAKUIN UNIV FAC ENGNTAGAJO 985JAPAN TOHOKU UNIV ELECT COMMUN RES INSTSENDAIMIYAGI 980JAPAN

A simple design method for transformerless and lossless quasi-broadband matching of a lumped RC load is presented by use of a parabolic nonuniform transmission line. The key idea in removing an ideal transformer from the matching network is based on impedance transformation of the nonuniform transmission line, whose mixed lumped and distributed equivalent circuit contains an ideal transformer. Illustrative examples and some design curves are presented.< >

关键词： Impedance distributed parameter circuits Equivalent circuits Design methodology Transmission line theory Propagation losses Nonlinear equations Design automation Frequency

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Calculation of High-Frequency Electromagnetic Field Coupling to Overhead Transmission Line Above a Lossy Ground and Terminated With a Nonlinear Load

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IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION 2019年第6期67卷 4119-4132页

作者： Guo, Jun Rachidi, Farhad Tkachenko, Sergey V. Xie, Yan-Zhao Xi An Jiao Tong Univ Sch Elect Engn Natl Ctr Int Res Transient Electromagnet & Applic State Key Lab Elect Insulat & Power Equipment Xian 710049 Peoples R China Swiss Fed Inst Technol Electromagnet Compatibil Lab CH-1015 Lausanne Switzerland Otto von Guericke Univ Chair Electromagnet Compatibil D-39106 Magdeburg Germany

High-frequency electromagnetic fields such as those associated with electromagnetic pulse (EMP) and intentional electromagnetic interference (IEMI) can couple to overhead power lines. Since the height of the overhead power lines can be comparable or even larger than the smallest wavelength of typical EMP and IEMI pulses, the classical transmission line approximation might not be suitable for evaluating the line response. On the other hand, a traditional full-wave solver (e.g., method of moments) is computationally inefficient, especially when dealing with long lines. To address these problems, we propose an efficient method to handle the high-frequency electromagnetic field coupling to overhead lines with nonlinear loads above a lossy ground. In the proposed method, the asymptotic approach is adopted and extended to the case of a lossy ground, which handles the problem in a semianalytical way and has a much higher computational efficiency in the case of long lines. Although the proposed method applies to the frequency domain, the case of nonlinear loads can be considered through a combination with the time-marching method. The proposed method is validated with several numerical examples.

关键词： Asymptotic method distributed parameter circuits high-frequency electromagnetic field overhead transmission line (TL) transient response

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Efficient Design of Waveguide Manifold Multiplexers Based on Low-Order EM distributed Models

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IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES 2015年第8期63卷 2540-2549页

作者： Cogollos, Santiago Soto, Pablo Boria, Vicente E. Guglielmi, Marco Brumos, Maria Gimeno, Benito Raboso, David Univ Politecn Valencia Dept Comunicac iTEAM E-46022 Valencia Spain Univ Valencia Dept Fis Aplicada Inst Ciencia Mat ICMUV E-46100 Burjassot Spain European Space Agcy Payloads Syst Div NL-2200 AG Noordwijk Netherlands

In this paper, a new systematic technique to design manifold-coupled multiplexers in waveguide technology is proposed. The new technique uses generalized low-order electromagnetic (EM) distributed models, which constitute a half-way point between the fast, but imprecise, analytical models, and the more accurate, but costly, full-wave EM models. The method can be applied to contiguous and noncontiguous channel multiplexers, in both E-plane or H-plane configurations. This paper covers the complete design procedure for manifold multiplexers, starting from the required specifications and finishing with the physical dimensions. After explaining the general design technique for multiplexers with channel filters based on transmission-line resonators, the method is specialized for the design of classic multiplexers with circular-waveguide dual-mode filters. As a further application example, the same methodology is also used for the design of a nonconventional tuningless wideband multiplexer with a new type of rectangular waveguide filters. This paper is concluded with a comparison between simulation and measurements for the wideband multiplexer. Excellent agreement between measurements and simulations are demonstrated, thereby validating the complete design procedure.

关键词： Design methodology distributed parameter circuits equivalent circuits microwave filters multiplexing

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SOME DESIGNS OF XL-BAND DIODE SWITCHES

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IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES 1966年第11期MT14卷 553-&页

作者： ASSALY, RN M I T Lincoln Laboratory Lexington MA USA

X/sub L/-band waveguide switches, using PIN diodes for the switching elements, were developed in the SPST, SP2T, SP4T, and SP8T configurations. At the frequency of 7.75 GHz, for which they were tuned, they exhibited insertion losses on the average of 0.1, 0.4, 0.6, and 1.1 dB, respectively. In all cases, the signal going out of each switch port when turned OFF decreased in excess of 29 dB. The bandwidth of each switch, whose values are indicated, is narrower for the switch which has the larger number of ports or which contains diodes of lower capacitance. Semiempirical formulas are developed which predict performance characteristics of the SPST switch in particular.

关键词： Switches Insertion loss Strips Diodes Impedance Transmission line theory Couplings Bandwidth distributed parameter circuits Microwave theory and techniques

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DETERMINING MAXIMUM OVERVOLTAGES PRODUCED BY EHV CIRCUIT BREAKER CLOSURE

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IEEE TRANSACTIONS ON POWER APPARATUS AND SYSTEMS 1968年第4期PA87卷 1026-&页

作者： LAUBER, TS General Electric Company Limited Philadelphia PA USA

A method of determining voltage levels due to energizing or reclosing EHV transmission lines by using traveling phasor concepts is described. The major advantage over previously described methods is economy in computation since the energizing phase need not be varied. Comparisons with field tests and analog results show good agreement.

关键词： Surges Circuit breakers Voltage System testing Equations Transient analysis Impedance Symmetric matrices Transmission line theory distributed parameter circuits

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A RESETTING ALGORITHM FOR TRANSIENT ANALYSIS OF COUPLED TRANSMISSION-LINE circuits

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IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES 1994年第3期42卷 494-500页

作者： LU, LC NAKHLA, MS ZHANG, QJ CARLETON UNIV DEPT ELECTROTTAWA K1S 5B6ONTARIOCANADA

The numerical inversion of Laplace transform has been used as an important tool for time domain analysis of high speed VLSI interconnects modeled by transmission line networks. In this paper, a resetting algorithm based on the numerical inversion of Laplace transform with Pade approximation is described. The initial conditions of coupled transmission lines required by the resetting algorithm are also derived. The new method results in substantial improvement of the accuracy of the numerical inversion of Laplace transform for solving transmission line networks with long transients. The new method also bridges the gap between two types of circuit simulation techniques, i.e., the numerical inversion of Laplace transform and the numerical integrations.

关键词： Transient analysis Laplace equations distributed parameter circuits Time domain analysis Very large scale integration Integrated circuit interconnections Transmission lines Approximation algorithms Coupling circuits Power system transients

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