scholarly journals A HYBRID METHOD FOR ELECTROMAGNETIC COUPLING PROBLEMS OF TRANSMISSION LINES IN CAVITY BASED ON FDTD METHOD AND TRANSMISSION LINE EQUATION

2015 ◽  
Vol 42 ◽  
pp. 85-93 ◽  
Author(s):  
Zhihong Ye ◽  
Xiang-Zheng Xiong ◽  
Cheng Liao ◽  
Yong Li
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
Hybrid Method ◽  
Electromagnetic Coupling ◽  
Fdtd Method ◽  
Line Equation

scholarly journals Multiresolution Time-Domain Scheme for Terminal Response of Two-Conductor Transmission Lines

2016 ◽  
Vol 2016 ◽  
pp. 1-15 ◽  
Author(s):  
Zongliang Tong ◽  
Lei Sun ◽  
Ying Li ◽  
Jianshu Luo
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
Time Domain ◽  
Fdtd Method ◽  
Numerical Dispersion ◽  
Dispersion Property ◽  
Scaling Functions ◽  
Terminal Response ◽  
Lossy Transmission ◽  
The Stability

This paper derives a multiresolution time-domain (MRTD) scheme for the two-conductor lossless transmission line equations based on Daubechies’ scaling functions. And a method is proposed to generate the scheme at the terminal and near the terminal of the lines. The stability and numerical dispersion of this scheme are studied, and the proposed scheme shows a better dispersion property than the conventional FDTD method. Then the MRTD scheme is extended to the two-conductor lossy transmission line equations. The MRTD scheme is implemented with different basis functions for both lossless and lossy transmission lines. Numerical results show that the MRTD schemes which use the scaling functions with high vanishing moment obtain more accurate results.

Hybrid FDTD Method for Studying Electromagnetic Coupling Effects of Transmission Line Networks

2017 ◽  
Vol 59 (5) ◽  
pp. 1650-1653 ◽  
Author(s):  
Jian Wang ◽  
Xiao Han ◽  
Kai Yang ◽  
Yin-Shui Xia ◽  
Wen-Yan Yin
Keyword(s):  
Transmission Line ◽  
Electromagnetic Coupling ◽  
Fdtd Method ◽  
Coupling Effects

scholarly journals Evaluation of Surge Voltages on the Overhead Lines due to Direct and Indirect Lightning Impulse

2021 ◽  
Vol 54 (5) ◽  
pp. 751-762
Author(s):  
Mulukala Sri Lalith ◽  
Patthi Sridhar ◽  
Ranjith Kumar Gatla ◽  
Alladi Sathish Kumar
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
Fdtd Method ◽  
Geometrical Analysis ◽  
Design Algorithm ◽  
Line System ◽  
Overhead Lines ◽  
Network Function ◽  
Coupling System ◽  
Lightning Impulse

This paper is devoted to describe how surge magnitudes are calculated and how do we use this data in order to determine the ageing of insulation on the transmission line poles so that we can replace the insulation in pre fault time, based on its condition. The main object of this report is to design algorithm of implementation of SCADA in the transmission line system to identify insulation ageing factor. In order to identify the magnitude of voltage due to direct lightning source, we have some formulae which provides the approximate value. For the magnitude value due to indirect lightning strokes, we use two methods namely RBF-FDTD method which uses artificial neural network function in order to study the detailed concept of coupling between field to transmission lines and the other method is the modelling of simulation system in which the coupling system approximations are taken. This paper also describes about the calculation of outage rate and its Geometrical analysis.

scholarly journals Bulk FDTD Simulation of Distributed Corona Effects and Overvoltage Profiles for HSIL Transmission Line Design

Energies ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2474
Author(s):  
Jon T. Leman ◽  
Robert G. Olsen
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
Fdtd Method ◽  
High Volume ◽  
Line Length ◽  
Structure Design ◽  
Fdtd Simulation ◽  
Compact Structure ◽  
Line Design ◽  
Corona Losses

Power system load growth and transmission corridor constraints are driving industry activity in the area of high surge impedance loading (HSIL). Examples include compact structure design and uprating existing transmission lines. Recent research relating electric field uniformity to transmission line capacity and critical flashover voltage underscored the need for better overvoltage data to quantify insulation margins for HSIL design. To that end, this work extends the finite difference time domain (FDTD) method with distributed corona losses to transmission lines with bundled conductors. The model was adapted for practical use in high-volume statistical transient simulation and applied to an example 500 kV line. Transients included line energization and trapped charge reclosing. Overvoltage profiles and statistical distributions were generated from 9500 simulations obtained by random breaker close timing and variation in line length and altitude. Distributed corona losses reduced 98th percentile line-to-ground switching overvoltages by 4%–14% of nominal. The estimated line-to-ground switching surge flashover probability was 54%–80% lower with corona loss. Corona had less impact on line-to-line overvoltages, but the effects were still notable. Results highlight the importance of considering detailed overvoltage profiles and accounting for corona loss attenuation when seeking to carefully quantify insulation design margins.

scholarly journals Analytical studies on waves in nonlinear transmission line media

2019 ◽  
Vol 9 (2) ◽  
pp. 100-104 ◽  
Author(s):  
Zehra Pinar
Keyword(s):  
Transmission Line ◽  
Exact Solutions ◽  
Transmission Lines ◽  
Auxiliary Equation ◽  
Electrical Transmission ◽  
Nonlinear Transmission Line ◽  
Auxiliary Equation Method ◽  
Nonlinear Transmission ◽  
Line Equation ◽  
Lossy Transmission

In this study, we introduce the lossy nonlinear transmission line equation, which is the dissipative-dispersive equation and an important problem of electrical transmission lines. For the engineers and physicist, the equation and its exact solutions are important so to obtain the exact solutions; one of the modifications of auxiliary equation method based on Chebyshev differential equation is studied. The results are discussed and given in details. Recently, the studies of lossy transmission line equation have been challenging, thus, it is believed that the proposed solutions will be key part of further studies for waves in nonlinear transmission line media, which has mixed dissipative-dispersive behavior.

Transient Simulation of Lightning Wave on Transmission Line

2013 ◽  
Vol 462-463 ◽  
pp. 585-591
Author(s):  
Jun Ye ◽  
Ke Zheng ◽  
Hong Liang Sun ◽  
Yu Chen
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
Fdtd Method ◽  
Resistive Load ◽  
Safe Operation ◽  
Service Interruption ◽  
Starting Point ◽  
Energy Metering ◽  
Key Factor ◽  
Telegraph Equations

Lightning is the main reason to cause line tripping and service interruption, and its surge wave invaded into substation over the line is also the key factor which impact on the safe operation of equipments. Research on over-voltage transmission of lightning will be benefit to measure the lightning interference impact on energy metering equipments. Analyzing the transient process of the transmission line must adopt the telegraph equations. In this paper, the partial differential equations were discrete with the FDTD method. Then the equivalent power source of lightning is added at the starting point and the purely resistive load is added at the terminal. Finally, the transient propagation process of lighting was simulated in MATLAB. The three type of lossless non-uniform, lossy uniform or non-uniform transmission lines were considered.

Composite right/left-handed transmission line with array of thermocouples for generating terahertz radiation

2020 ◽  
Vol 92 (2) ◽  
pp. 20502
Author(s):  
Behrokh Beiranvand ◽  
Alexander S. Sobolev ◽  
Anton V. Kudryashov
Keyword(s):  
Transmission Line ◽  
Terahertz Radiation ◽  
Transmission Lines ◽  
Software Package ◽  
Optical Pulses ◽  
Capacitively Coupled ◽  
Voltage Difference ◽  
Left Handed ◽  
Microwave Transmission ◽  
Commercial Software Package

We present a new concept of the thermoelectric structure that generates microwave and terahertz signals when illuminated by femtosecond optical pulses. The structure consists of a series array of capacitively coupled thermocouples. The array acts as a hybrid type microwave transmission line with anomalous dispersion and phase velocity higher than the velocity of light. This allows for adding up the responces from all the thermocouples in phase. The array is easily integrable with microstrip transmission lines. Dispersion curves obtained from both the lumped network scheme and numerical simulations are presented. The connection of the thermocouples is a composite right/left-handed transmission line, which can receive terahertz radiation from the transmission line ports. The radiation of the photon to the surface of the thermocouple structure causes a voltage difference with the bandwidth of terahertz. We examined a lossy composite right/left-handed transmission line to extract the circuit elements. The calculated properties of the design are extracted by employing commercial software package CST STUDIO SUITE.

Lightning Surge Analysis of Transmission Line Towers with a Hybrid PEEC-FDTD Method

2021 ◽  
pp. 1-1
Author(s):  
Jinxin Cao ◽  
Yuxuan Ding ◽  
Ya Ping Du ◽  
Binghao Li ◽  
Ruihan Qi ◽  
...  
Keyword(s):  
Transmission Line ◽  
Fdtd Method
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