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.

Development on Environmental Geotechnology for Overhead Transmission Line Foundation Engineering in China

2012 ◽  
Vol 610-613 ◽  
pp. 2813-2818
Author(s):  
Xian Long Lu ◽  
Zeng Zhen Qian
Keyword(s):  
Transmission Line ◽  
Environmental Protection ◽  
Transmission Lines ◽  
Water Conservation ◽  
Design Method ◽  
Foundation Engineering ◽  
Foundation Construction ◽  
Overhead Transmission Line ◽  
Tower Foundation ◽  
Soil And Water

This paper presents the concept and the fundamental issues and the development on the environmental geotechnology in transmission lines foundation engineering. Namely, environmental geotechnology and theory is to study the restriction effects of environment on the transmission line routes, foundation selection and reliability, to predict the results of transmission line foundation construction on the environment, and to study on countermeasures of environmental protection in transmission foundation engineering. And then, from the above three aspects, the design method combined strength and displacement for tower foundation, the selection on foundation types and technical scheme for transmission line tower, and the countermeasures for soil and water conservation, the author introduces the development and practice of environmental geotechnology for transmission lines foundation engineering in China.

scholarly journals Modeling Features of a Single Phase-to-Earth Fault in a Medium Voltage Overhead Transmission Line

2020 ◽  
Vol 4 (2) ◽  
pp. 127-138
Author(s):  
Ismael Saeed ◽  
Kamal Sheikhyounis
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
Single Phase ◽  
Single Frequency ◽  
Mathematical Representation ◽  
Medium Voltage ◽  
Overhead Transmission Line ◽  
Earth Fault ◽  
Distributed Parameters ◽  
Selection Of

The modeling and calculation of a single phase-to-earth fault of 6 to 35 kV have specific features when compared with circuits with higher nominal voltages. In this paper, a mathematical analysis and modeling of a 3-phase overhead transmission line with distributed parameters consisting of several nominal T-shaped, 3-phase links with concentrated parameters replaced by 1 nominal T-shaped link were carried out. Further analysis showed that not accounting for the distributed nature of the line parameters did not cause significant errors in the assessment of the maximum overvoltage in the arc suppression in single phase-to-earth faults, and that sufficient accuracy insures the representation of the line by only 1 nominal T-shaped, 3-phase link. Such a modeling technique makes it impossible to identify the location of single-phase faults, which is the property of higher harmonic amplification of individual frequencies. Chain equivalent schemas with constant parameters are valid for a single frequency, thereby providing an opportunity to study the nature of the wave process by the discrete selection of parameters. Next in the mathematical representation, we consider the overhead transmission lines as lines with distributed parameters.

Wire Suspension System Based on Fault Tree Analysis Running Condition Assessment

2014 ◽  
Vol 986-987 ◽  
pp. 1401-1404
Author(s):  
Bing Hao ◽  
Li Zhi
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
Condition Assessment ◽  
Suspension System ◽  
Weak Links ◽  
Tree Analysis ◽  
Overhead Transmission Line ◽  
Wire Suspension

Overhead transmission lines is an important part in the power system and the lifeblood of the transmission system.Important element of the transmission line conductor suspension system namely conductor and insulator, hardware.This paper, by using the fault tree analysis method, establishes the mathematical model of the transmission line conductor suspension system running condition assessment, reliably evaluates the running status of system, find out the weak links and the problems of the various parts, for the evaluation and maintenance of overhead transmission line provide theoretical support.

Lightning Overvoltage Analysis and Calculation of 330kV Overhead Transmission Line

2014 ◽  
Vol 556-562 ◽  
pp. 1588-1591
Author(s):  
Xiu Bin Zhang ◽  
Ding Jun Wen ◽  
Ya Ming Sun ◽  
Hong Gang Chen
Keyword(s):  
Transmission Line ◽  
Equivalent Circuit ◽  
High Voltage ◽  
Transmission Lines ◽  
Equivalent Circuit Model ◽  
Voltage Level ◽  
High Voltage Transmission Line ◽  
Overhead Transmission Line ◽  
Overhead Transmission Lines ◽  
Pollution Flashover

Lighting is one of the important reasons of transmission line trip accident. For 330kV and above ultra high voltage transmission line, lighting flashover more frequently occur. To reduce tripping rate effectively and fundamentally, lightning over voltage level should be analyzed besides anti-pollution flashover. In this paper, a simplified equivalent circuit model of a 330kV overhead transmission lines is established. The lightning over voltage of the transmission is analyzed and calculated. Method to reduce the lightning overvoltage is discussed.

New Methodology of On-Line Monitoring for Transmission Line Galloping

2013 ◽  
Vol 805-806 ◽  
pp. 867-870 ◽  
Author(s):  
Yu Sheng Quan ◽  
Enze Zhou ◽  
Guang Chen ◽  
Xin Zhao
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
Large Scale ◽  
Online Monitoring ◽  
Large Area ◽  
Monitoring Method ◽  
Overhead Transmission Line ◽  
Additional Equipment ◽  
On Line ◽  
Wire Cross Section

When the overhead transmission line is galloping, a variety of natural disasters occur on the role of the natural conditions, the vibration of conductor is one of the more serious harm to the power system. Over the past decade, as the construction of EHV and UHV, wire cross-section, tension, suspension height and span of overhead transmission lines are increasing, and hence the number of conductor vibration is significantly increased. Vibration in a large scale will led to frequent tripping or even broken line or tower collapses, which cause large area power failures and impact security and stability operation. Online monitoring method for overhead transmission line dancing is mostly needed to add additional equipment, however, once situated on the route environment overlying ice or high winds and other inclement weather, online monitoring is difficult to achieve. This paper presents a method, which is made correlation analysis based on the voltage and current acquired from both ends of the transmission lines, online monitoring of line galloping can be achieved.

New Methodology of Fault Identifier for the Double Circuit Line on the same Tower

2014 ◽  
Vol 521 ◽  
pp. 330-333
Author(s):  
Yu Sheng Quan ◽  
En Ze Zhou ◽  
Hua Gui Chen ◽  
Xin Zhao
Keyword(s):  
Power System ◽  
Transmission Line ◽  
Transmission Lines ◽  
Social Economy ◽  
Criterion Function ◽  
Transient Fault ◽  
Permanent Fault ◽  
Overhead Transmission Line ◽  
Practical Engineering ◽  
The Stability

High voltage overhead transmission line is an important part of the power system to ensure the safe operation of the entire power system, which is of great significance. Power line fault not only has adverse effects to the social economy, and it may also affect the stability of the power system. Transmission line faults including permanent fault and transient fault are identified quickly and accurately, which has important practical engineering significance. This paper presents a method which can be used to identify the permanent fault and transient fault of double-circuit transmission line on the same tower, fault transient voltages and currents extracted from both ends of transmission lines are as a signal source which is decomposed into a series of harmonics in order to establish a criterion function, and then the transient and permanent fault can be identified based on the changes of criterion function value.

scholarly journals Distribution of Magnetic Field in 400 kV Double-Circuit Transmission Lines

2020 ◽  
Vol 10 (9) ◽  
pp. 3266 ◽  
Author(s):  
Ramūnas Deltuva ◽  
Robertas Lukočius
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Transmission Line ◽  
Magnetic Field Strength ◽  
Transmission Lines ◽  
Power Transmission ◽  
Power Transmission Line ◽  
Overhead Transmission Line ◽  
The City ◽  
The Magnetic Field

A high-voltage AC double-circuit 400 kV overhead power transmission line runs from the city of Elk (Poland) to the city of Alytus (Lithuania). This international 400 kV power transmission line is potentially one of the strongest magnetic field-generating sources in the area. This 400 kV voltage double-circuit overhead transmission line and its surroundings were analyzed using the mathematical analytical methods of superposition and reflections. This research paper includes the calculation of the numerical values of the magnetic field and its distribution. The research showed that the values of the magnetic field strength near the international 400 kV power transmission line exceed the threshold values permitted by relevant standards. This overhead power line is connected to the general (50 Hz) power system and generates a highly intense magnetic field. It is suggested that experimental trials should be undertaken in order to determine the maximum values of the magnetic field strength. For the purpose of mitigating these values, it is suggested that the height of the support bars should be increased or that any individual and commercial activities near the object under investigation should be restricted.

Simulation of the ice accretion process on a transmission line cable with differential twisting

2007 ◽  
Vol 34 (2) ◽  
pp. 147-155 ◽  
Author(s):  
Ping Fu ◽  
Masoud Farzaneh
Keyword(s):  
Transmission Line ◽  
Computer Modelling ◽  
Air Pressure ◽  
Ice Accretion ◽  
Validity And Reliability ◽  
Overhead Transmission Line ◽  
Accretion Process ◽  
Ice Loads ◽  
Modelling Methods ◽  
Modelling Simulation

Cable rotation caused by ice accretion was specifically modelled and simulated for this paper. Both ice loads and wind-on-ice loads were taken into account during the modelling, and the quantity for the wind-on-ice loads was obtained by integrating air pressure and air shear along the airflow boundary. Air pressure and air shear were both evaluated through time-dependent airflow computations. Two types of overhead transmission line cables, namely, the Bersimis cable and an overhead ground wire, were examined using the new model, and a number of conclusions were drawn. The validity and reliability of the modelling methods were confirmed by comparing the simulation results with those obtained from experimental measurements.Key words: airflow computation, cable rotation, ice accretion, computer modelling, simulation.

The Research and Design of Overhead Transmission Line Temperature Monitoring Technology Based on ZigBee

2013 ◽  
Vol 846-847 ◽  
pp. 578-582
Author(s):  
Hong Liang Wang ◽  
Min Cao ◽  
Da Da Wang ◽  
Peng Li ◽  
Shao Quan Zhang
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
High Reliability ◽  
Temperature Monitoring ◽  
Software Systems ◽  
Wireless Data ◽  
Information Platform ◽  
Overhead Transmission Line ◽  
Zigbee Protocol ◽  
Line Temperature

Overhead transmission line temperature monitoring system for the protection of the safe operation of the transmission line is important, this paper introduces the ZigBee protocol level and the network topology, using the existing hardware platform designed and implemented programming ZigBee protocol stack, and then studied and designed based on ZigBee technologies overhead Transmission Lines temperature wireless data collection, gives the overall system architecture and hardware circuits, software systems, and do the experiment. After the unified information platform and experiment, the method is proved to be effective and feasible. The technology has high reliability, scalability, and low operating costs, especially for remote areas of Yunnan, China's high-voltage transmission line temperature monitoring.

scholarly journals Again about reliability characteristics of electrical power grids elements

2018 ◽  
Vol 58 ◽  
pp. 01002
Author(s):  
Abdula Abdurakhmanov ◽  
Sergey Glushkin ◽  
Vladislav Plotnikov ◽  
Andrey Shuntov
Keyword(s):  
Statistical Analysis ◽  
Transmission Line ◽  
Transmission Lines ◽  
Electrical Power ◽  
Power Grids ◽  
Overhead Transmission Line ◽  
Overhead Transmission Lines ◽  
Network Layout ◽  
Reliability Characteristics ◽  
Technical Solutions

The reliability characteristics of the (auto)transformers and overhead transmission lines of the unified national electric grid are subjected to statistical analysis. It is shown that their scheduled outages for scheduled or unscheduled repairs, as well as maintenance, weaken the network layout much more than emergency repairs. At the same time, there was a noticeable deterioration in the (auto)transformers and overhead transmission line reliability indexes over the last 30 years, which requires the development and adoption of appropriate organizational and technical solutions.

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