scholarly journals Modeling of Positive Switching Impulse Discharge of UHV Transmission Line Air Gaps

2018 ◽  
Vol 8 (12) ◽  
pp. 2594 ◽  
Author(s):  
Jiachen Gao ◽  
Linong Wang ◽  
Qiushi Zhang ◽  
Bin Song
Keyword(s):  
Transmission Line ◽  
Breakdown Voltage ◽  
Transmission Lines ◽  
Test Results ◽  
Discharge Characteristics ◽  
Air Gaps ◽  
Impulse Discharge ◽  
Discharge Model ◽  
Important Basis ◽  
Uhv Transmission Lines

Positive switching impulse discharge characteristics are an important basis for the external insulation design of transmission line towers. At present, the characteristics are obtained mainly by real tower discharge tests. Since the existing research on the discharge model is not perfect, test designs are not reasonable, which results in high costs. The influence of line height and tower width on the discharge characteristics of Ultra High Voltage (UHV) transmission lines air gaps is studied in this paper. The results show that the line height had little influence on the breakdown voltage of air gaps in UHV transmission lines. A tower-width discharge model was obtained by fitting the breakdown voltage of air gaps with different gap lengths and tower widths. By analyzing the gap characteristic factors of different transmission lines, a discharge model of different tower air gaps in UHV transmission lines was presented. The breakdown voltage calculated by the models was in good agreement with the test results, and the errors were not more than 5%.

Switching impulse discharge characteristics of UHV transmission line air gaps

2019 ◽  
Vol 14 (5) ◽  
pp. 735-741 ◽  
Author(s):  
Jiachen Gao ◽  
Linong Wang ◽  
Qiushi Zhang ◽  
Bin Song ◽  
Kai Liu ◽  
...  
Keyword(s):  
Transmission Line ◽  
Discharge Characteristics ◽  
Air Gaps ◽  
Impulse Discharge

The Research of Application Mode of Unmanned Aircraft Patrol in UHV Transmission Lines

2014 ◽  
Vol 536-537 ◽  
pp. 989-992
Author(s):  
Yong Li ◽  
Xin Ge ◽  
Xue Liang Hou
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
Rapid Development ◽  
Unmanned Aircraft ◽  
Structure Characteristics ◽  
Application Mode ◽  
Vehicle Inspection ◽  
Aerial Vehicle ◽  
Ac Transmission ◽  
Uhv Transmission Lines

In the UHV AC transmission lines will be rapid development momentum of main frame China grid, inspection of UHV transmission line for the realization of unmanned aircraft utility,this article makes an analysis for the structure characteristics and defects of the UHV transmission line , finds out the defect characteristics, and summarizes the characteristics of the UAV and inspection instrument. According to the characteristic of UHV defect, we display its properties of unmanned aerial vehicles and inspection instrument, construct the application mode of four kinds of unmanned aerial vehicle inspection, and have a description for each model.

scholarly journals Improved Electrogeometric Model Suitable for EHV and UHV Transmission Lines Developed through Breakdown Testing for Long Air Gaps

Energies ◽  
2017 ◽  
Vol 10 (3) ◽  
pp. 333 ◽  
Author(s):  
Yeqiang Deng ◽  
Yu Wang ◽  
Zhijun Li ◽  
Min Dai ◽  
Xishan Wen ◽  
...  
Keyword(s):  
Transmission Lines ◽  
Air Gaps ◽  
Uhv Transmission Lines ◽  
Electrogeometric Model

Test Research on Phase-to-Ground Air-Gap Discharge Characteristics of UHV Substation

2014 ◽  
Vol 492 ◽  
pp. 162-168
Author(s):  
Qi Ming Ye ◽  
Liang Xie ◽  
Xiao Qing Luo ◽  
Feng Huo
Keyword(s):  
Minimum Distance ◽  
Discharge Voltage ◽  
Air Gap ◽  
Test Results ◽  
Discharge Characteristics ◽  
Voltage Rise ◽  
Test Base ◽  
Impulse Discharge ◽  
Lightning Impulse

In order to optimize the design of UHV substation and reduce its construction investment, it is necessary to take further research of UHV substation air-gap discharge characteristics. In this paper, by using sub-conductor and tower to simulate UHV substation air-gap, lightning and switching impulse discharge characteristics tests of UHV substation are taken in the UHV AC test base of SGCC. The results show that, when the distance of conductor between tower is in range of 4m to 7m, the 50% lightning impulse and switching impulse discharge voltage rise along with the rise of air gap distance. As the air-gap increases, the switching impulse discharge voltage presents the trend of saturation. According to the analysis of test results, we can draw a conclusion that the gap factor of switching impulse discharge can be 1.22 when the minimum distance between conductors and tower is 5~8m.

scholarly journals Frequency Selective Properties of Coaxial Transmission Lines Loaded with Combined Artificial Inclusions

2014 ◽  
Vol 2014 ◽  
pp. 1-6
Author(s):  
Francisco Falcone ◽  
Javier Gil
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
Ring Resonators ◽  
Split Ring ◽  
Split Ring Resonators ◽  
Air Gaps ◽  
Potential Applications ◽  
Frequency Selective ◽  
Line Technology

The properties of a modified coaxial transmission line by periodic inclusions will be discussed. The introduction of split ring resonators, conductor stubs, air gaps, and combination of these gives rise to new frequency selective properties, such as stopband or passband behavior, observable in planar as well as volumetric metamaterial structures. These results envisage new potential applications and implementation of devices in coaxial transmission line technology.

scholarly journals Analysis of active interference on radio station from AC UHV power

2018 ◽  
Vol 64 ◽  
pp. 05003
Author(s):  
Jiangong ZHANG ◽  
Zheyuan GAN ◽  
Jun ZHAO ◽  
ying Lu
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
Calculation Method ◽  
Electromagnetic Interference ◽  
Radio Station ◽  
Normal Operation ◽  
Radar Station ◽  
Uhv Transmission Lines

The problems of Electromagnetic Interference in Airborne Intelligence Radar Stations near the AC UHV Transmission Lines are researched in this paper, which is mainly active interference. The calculation method for the interferences is analysed, and then the proper protection distances of the AC UHV transmission line to the radar station are given. The paper analyzed the active interference of AC UHV transmission lines, and focuses on the active interference caused by the line corona on the active radar of nearby airborne intelligence when the transmission line is under normal operation. In the end, this paper proposes the recommended values of active interference protection distance for 1000kV AC UHV transmission lines and airborne intelligence radar stations.

scholarly journals The Research of real-time identification system of types of lightning failures of UHV transmission lines based on UV detection technique

2020 ◽  
Vol 185 ◽  
pp. 01048
Author(s):  
Yunlong Wang ◽  
Lidong Yan ◽  
Yongning Wang ◽  
Guochao Yang
Keyword(s):  
Transmission Line ◽  
Real Time ◽  
High Voltage ◽  
Transmission Lines ◽  
Lightning Discharge ◽  
Lightning Protection ◽  
Identification System ◽  
High Voltage Transmission Line ◽  
Real Time Identification ◽  
Uhv Transmission Lines

Egineering running experience shows that with the increase of the operating voltage of the transmission line, the lightning trip rate is increasing. According to theoretical calculation ， UHV transmission lines should be provided with full lightning protection characteristics；however，running experience shows that the lightning withstand level of UHV transmission lines is high，not completely lightning protection; it puts forward higher requirements for lightning protection design of UHV transmission line in China. UHV transmission line is mainly against direct lightning stroke characteristics， one is caused by lightning counterattack trip，the other is the shielding failure of lightning around the line to strike the wound caused by the wire. The lightning fault type identification is based on the micro topography of UHV transmission tower，accumulation of historical data，the development of a more targeted and high voltage transmission line lightning protection scheme is of great significance. In this paper, a real-time identification system based on UV detection technology, which has high accuracy and fast response time, is proposed for lightning fault types of UHV transmission lines, the systems use ultraviolet light to realize online detection of high-voltage transmission line tower nearby lightning, can effective observation tower near lightning discharge, and it has the characteristics of continuous detection, longdistance, no power supply, no contact and no disassembly, it provides an advanced technology for the detection of lightning discharge in UHV transmission line.

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