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.

The Construction and Development of Comprehensive Test Centre Based on Real Transmission Line

2013 ◽  
Vol 330 ◽  
pp. 163-171
Author(s):  
Xiao Hui Yang ◽  
Dong Yan ◽  
Yu Sheng Zheng ◽  
Xiao Kuo Kou
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
Low Frequency ◽  
Line Length ◽  
Ice Accretion ◽  
Overhead Transmission Line ◽  
Function Design ◽  
Comprehensive Test ◽  
Grid Operation ◽  
Natural Climate

Galloping of overhead transmission line is a low-frequency, large amplitude, wind-induced vibrations of both single and bundle of overhead transmission lines, which have been one of the largest threaten for the security and stability of power grid operation. On account of the uncertainty and probability of galloping events happening, most of the study on transmission line galloping had still stayed on simulation or model test, only less of the study were in accordance with the accident records on-site. Several ten years study on conductor galloping had been proved that the laboratory built on real transmission line was the essential foundation and the effective condition for the systemic study on galloping. Comprehensive Test Centre based on Real Transmission Line (CTC for short) is the first laboratory focus on the study of conductor galloping and ice-accretion. whose content of tower type,conductor arrangement and transmission line length, currently have been the most abundant in worldwide. The establishment of the Comprehensive test centre have been very important on promoting the fundamental and systemic study in the relative field. Since the frequent conductor galloping under the condition of natural climate achieved successfully, CTC have developed several essential and valuable scientific projects. In this paper, CTC would be introduced from the aspects of basic facilities configuration, mainly function design and implementation, focal capabilities and some study outcomes at moment.

scholarly journals Corona Loss Minimization on High Voltage Transmission Line Network using Bundled Conductors.

2020 ◽  
Vol 9 (3) ◽  
pp. 887-891
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
Power Transmission ◽  
Hessian Matrix ◽  
Electrical Power ◽  
Power Transmission Lines ◽  
Long Distance ◽  
Power Stations ◽  
Line Network ◽  
Corona Losses

Electrical power generated and transmitted at a long distance away from the power stations is usually affected by inherent transmission line losses. The Ohmic and Corona losses which are predominantly common in power transmission lines are considered in this paper. These two losses are mathematically modeled with and without embedded bundled conductors. The resultant model which is a non-linear multivariable unconstrained optimized equation is minimized using the Hessian matrix determinant method for stability test purposes. The results obtained show that corona losses are minimized with embedded bundled conductors at a very low current value with large spacing distance between the bundled conductors. The decrease in the corona loss which is a consequence of spacing adjustment of the 2, 3, and 4 strands of bundled conductors was plotted using MATLAB 7.14. The plots obtained are in conformity with the inverse relation between corona loss and conductor spacing.

The System Structure Design and Test of Small UAV Airborne Pod

2014 ◽  
Vol 667 ◽  
pp. 425-429
Author(s):  
Jin Dong Wang ◽  
Hua Dong Yu ◽  
Jin Kai Xu ◽  
Bing Yan Chen
Keyword(s):  
Low Temperature ◽  
Theoretical Analysis ◽  
Transmission Line ◽  
Transmission Lines ◽  
Structure Design ◽  
System Structure ◽  
Ultrahigh Pressure ◽  
Overhead Transmission Lines ◽  
Small Uav ◽  
Pressure Transmission

According to operation requirement for overhead transmission lines inspection, designing and manufacturing the small UAV airborne pod system structure which has two axis three framework with spring damping system , assembling into the UAV for ultrahigh pressure overhead transmission lines inspection test. The test data showed that the accuracy of the small UAV airborne pod system stabilization met the requirement of transmission line inspection. The operation situation of transmission line and the growth situation of the trees around the transmission lines could be clearly observed. In order to quickly, effectively discover and eliminate ultrahigh pressure transmission line fault by providing clear image information, which had obvious superiority with the environment of high altitude and low temperature. The rationality of theoretical analysis and the practicability of transmission lines inspection for small UAV airborne pod system were verified.

Transmission Line State Maintenance Expert System Development and Design

2014 ◽  
Vol 1006-1007 ◽  
pp. 1005-1009
Author(s):  
Yao Jun Liu ◽  
Zhuo Li Guo ◽  
Hua Pu Chen
Keyword(s):  
Expert System ◽  
Transmission Line ◽  
Transmission Lines ◽  
System Development ◽  
The State ◽  
Repair Work ◽  
Treatment Measures ◽  
Safety And Reliability ◽  
Operation Stability ◽  
Line Design

When the human to transmission line repair, many potential risks and fault will cannot be found in time, resulting in not by prior treatment measures to ensure the safety and reliability of the power supply. To realize the state overhaul transmission line, can reduce the blindness of maintenance, improve the transmission line operation stability and save a lot of manpower material resources. Transmission line state repair work there are many difficulties, so in the state overhaul transmission line, on the basis of elaborating the transmission line design condition maintenance expert system, in order to improve the transmission lines the state overhaul of work efficiency.

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.

scholarly journals Fault Location on Series Compensated Power Transmission Lines Using Transient Spectrum

2018 ◽  
Vol 7 (3.6) ◽  
pp. 286 ◽  
Author(s):  
C R. Jayamurthi ◽  
A Sowmiya
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
Fault Location ◽  
Power Transmission ◽  
Electronic Devices ◽  
Line Length ◽  
Power Transmission Lines ◽  
Smart Power ◽  
Two Sides ◽  
Circuit Power

A Transmission line fault locality analyzing process for multi-circuit power transmission series compensated line up with phasor records as of smart electronic devices available at both split ends. During the case of unavailability of synchronize records, logical synchronization is acquire by means of an operative. During the power transmission process, the techniques consider untransposed line segment ensuing on top of two side of the power fault with the dispersed environment of transmission line. In favor of in the pink phase, current on two sides flow at the fault position be identical unlike exceptional current on two sides in a fault phase. This be checkered in excess of the line length along with the fault location is identify. The technique does not need the model of the series recompense located by at all locality on the line along with be capable of be use for both internal and external-circuit fault. It as well reflects on reactive element of the fault impedance for accurate fault position. The technique is analyzed with PSCAD/EMTDC simulation used for a multi-circuit series-compensated line in Indian smart power grid. Estimation revise confirm the strength of the technique used for different faults. 

An Evaluation of Pneumatic Transmission Line Propagation Functions

1974 ◽  
Vol 96 (1) ◽  
pp. 77-87 ◽  
Author(s):  
A. E. Churches ◽  
E. C. Hind ◽  
R. A. A. Bryant
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
Line Length ◽  
Theoretical Expression ◽  
Working Fluid ◽  
Frequency Range ◽  
Wide Range ◽  
Gauge Pressure ◽  
Propagation Function ◽  
Best Fit

The results of pressure response tests are given for a wide range of dead-ended pneumatic transmission lines. The tests were conducted on lines of commercial quality PVC tubing of length 1 ft to 50 ft, inside diameter 1/8 to 3/8 in., and over a frequency range from 2Hz to 1000Hz. Air at approximately 60 deg F and a mean gauge pressure of 1.0 lb/in.2 was used as the working fluid, with input signal amplitudes of ±0.1 lb/in2. The resulting data have been used to calculate the propagation function and hence to determine best-fit values of the constants which appear in the approximate theoretical expression of F. T. Brown. While the performance of many lines of interest may be predicted accurately by using Brown’s theoretical constants, the tests have shown significant changes in the experimentally determined values of the constants as line length decreases. These changes may be due, at least in part, to the increasing significance of wall elasticity at higher frequencies, an effect which is not included in Brown’s analysis. The data are given in a form which is directly applicable to calculating transmission line response.

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.

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