Study on the Identification of Lightning Over-Voltage Based on ATP-EMTP

2014 ◽  
Vol 672-674 ◽  
pp. 799-802
Author(s):  
Xiao Gang Li ◽  
Li Xue Li ◽  
Yi Hui Zheng ◽  
Xin Wang ◽  
Jian You Yu ◽  
...  
Keyword(s):  
Power System ◽  
Transmission Line ◽  
Transient Process ◽  
Transmission Lines ◽  
Weak Link ◽  
Simulation Models ◽  
Transmission Line Model ◽  
Lightning Stroke ◽  
Line Model ◽  
Simulation Results

Lightning overvoltage often leads to transmission lines trip, which is the weak link of power system. In this paper, 110-kV transmission line model is studied on the basis of the EMTP software. Several simulation models are established for back flashover lightning, induced lightning, shield failure. The transient process of lightning stroke is studied. According to the contrast of simulation results of three kinds of lightning, a set of discriminant basis to distinguish lightning on transmission line is put forward.

Predicting formulae for effective length of counterpoise wires buried in ionized, dispersive and inhomogeneous soils

2020 ◽  
Vol 39 (6) ◽  
pp. 1375-1391
Author(s):  
Seyyed Sajjad Sajjadi ◽  
Saeed Reza Ostadzadeh
Keyword(s):  
Sensitivity Analysis ◽  
Transmission Line ◽  
Design Methodology ◽  
Effective Length ◽  
Transmission Line Model ◽  
Line Model ◽  
Content Type ◽  
Dispersion Effects ◽  
Simulation Results

Purpose The purpose of this paper is to investigate the ionization and dispersion effects in combination with the inhomogeneity of soil simultaneously on the effective lengths of counterpoise wires. Design/methodology/approach Improved multi-conductor transmission line model is used for computing effective length of counterpoise wires considering all aspects of soils. Findings The simulation results show that the ionization and dispersion effects simultaneously results in placing the effective length between situations where only one effect is considered. Also, predicting formulae for effective length of counterpoise wires considering all effects are proposed. Originality/value A sensitivity analysis on the effective lengths of counterpoise wires considering all aspects of soils is carried out.

scholarly journals A Non-Uniform Transmission Line Model of the ±1100 kV UHV Tower

Energies ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 445 ◽  
Author(s):  
Xianshan Guo ◽  
Ying Fu ◽  
Jingqiu Yu ◽  
Zheng Xu
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
Transmission Line Model ◽  
Voltage Level ◽  
Line Model ◽  
Lightning Strikes ◽  
Impedance Model ◽  
Electromagnetic Transient ◽  
Structure Changes ◽  
The Impact

The modeling of the Ultra-High Voltage (UHV) tower plays an important role in lightning protection analysis of transmission lines because the model used will directly affect the reliability of the results. Moreover, the higher the voltage level is, the more prominent the impact becomes. This paper first analyzes the inapplicability of the Hara multi-segment multi-surge impedance model for the ±1100 kV UHV towers, and then builds a non-uniform transmission line model of the tower. Secondly, the multi-segment multi-surge impedance model is used to study the influence of the tower’s spatial structure changes on its electromagnetic transient characteristics. It is concluded that the more accurately the nominal height of the tower is modeled, the more accurately its electromagnetic transient response is reflected. Finally, the lightning electromagnetic transient responses of the tower with the non-uniform transmission line model and with the multi-segment multi-surge impedance model are compared and analyzed, which shows that the non-uniform transmission line model is more in line with the actual situation under the lightning strikes.

Research of Modeling Method of Transmission Line Information Based on IEC61850

2015 ◽  
Vol 713-715 ◽  
pp. 1377-1380
Author(s):  
Xue Ming Zhai ◽  
Long An ◽  
Huan Xia
Keyword(s):  
Smart Grid ◽  
Transmission Line ◽  
Transmission Lines ◽  
Data Model ◽  
Complete Data ◽  
Modeling Method ◽  
Transmission Line Model ◽  
Line Model ◽  
Iec 61850 ◽  
Standard Information

Currently the IEC 61850 standard for the transmission line has not been established a complete data model, restricting the development of smart grid. This paper is based on the study of the IEC 61850 standard, and information on major transmission lines were analyzed in detail, in accordance with the standard information of transmission line model based on IEC 61850 was established.

scholarly journals Corporate-Feed Multilayer Bow-Tie Antenna Array Design Using a Simple Transmission Line Model

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
S. Didouh ◽  
M. Abri ◽  
F. T. Bendimerad
Keyword(s):  
Transmission Line ◽  
Antenna Array ◽  
Method Of Moments ◽  
Return Loss ◽  
Transmission Line Model ◽  
Line Model ◽  
Technological Characteristics ◽  
Simulation Results ◽  
5 Ghz ◽  
Bow Tie

A transmission line model is used to design corporate-fed multilayered bow-tie antennas arrays; the simulated antennas arrays are designed to resonate at the frequencies 2.4 GHz, 5 GHz, and 8 GHz corresponding to RFID, WIFI, and radars applications. The contribution of this paper consists of modeling multilayer bow-tie antenna array fed through an aperture using transmission line model. The transmission line model is simple and precise and allows taking into account the whole geometrical, electrical, and technological characteristics of the antennas arrays. The proposed transmission line model showed its interest in the design of different multilayered bow-tie antennas and predicted the correct resonance frequency for different applications in telecommunications. To validate the proposed transmission line model, the simulation results obtained are compared with those obtained by the method of moments. The results of simulations are presented and discussed. Using this transmission line approach, the resonant frequency, input impedance, and return loss can be determined simultaneously. The paper reports several simulation results that confirm the validity of the developed model. The obtained results are then presented and discussed.

Model Order Reduction of Transmission Line Model

2020 ◽  
Vol 19 ◽  
Keyword(s):  
Transmission Line ◽  
Large Scale ◽  
Original System ◽  
Reduced Order Model ◽  
Benchmark Problems ◽  
Transmission Line Model ◽  
Order Model ◽  
Line Model ◽  
Reduced Order ◽  
Numerical Effort

Transmission Line model are an important role in the electrical power supply. Modeling of such system remains a challenge for simulations are necessary for designing and controlling modern power systems.In order to analyze the numerical approach for a benchmark collection Comprehensive of some needful real-world examples, which can be utilized to evaluate and compare mathematical approaches for model reduction. The approach is based on retaining the dominant modes of the system and truncation comparatively the less significant once.as the reduced order model has been derived from retaining the dominate modes of the large-scale stable system, the reduction preserves the stability. The strong demerit of the many MOR methods is that, the steady state values of the reduced order model does not match with the higher order systems. This drawback has been try to eliminated through the Different MOR method using sssMOR tools. This makes it possible for a new assessment of the error system Offered that the Observability Gramian of the original system has as soon as been thought about, an H∞ and H2 error bound can be calculated with minimal numerical effort for any minimized model attributable to The reduced order model (ROM) of a large-scale dynamical system is essential to effortlessness the study of the system utilizing approximation Algorithms. The response evaluation is considered in terms of response constraints and graphical assessments. the application of Approximation methods is offered for arising ROM of the large-scale LTI systems which consist of benchmark problems. The time response of approximated system, assessed by the proposed method, is also shown which is excellent matching of the response of original system when compared to the response of other existing approaches .

Transmission line model for superconducting coplanar lines

1990 ◽  
Vol 26 (2) ◽  
pp. 148 ◽  
Author(s):  
D. Kinowski ◽  
C. Seguinot ◽  
P. Pribetich ◽  
P. Kennis
Keyword(s):  
Transmission Line ◽  
Transmission Line Model ◽  
Line Model
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