Analysis on Lightning Withstand Level of Back Striking Flashover for Double-Circuit Transmission Line

2014 ◽  
Vol 1070-1072 ◽  
pp. 1050-1055 ◽  
Author(s):  
Shi Jun Xie ◽  
Jian Ming Li ◽  
Yu Han Jiang ◽  
Yu Zhang
Keyword(s):  
Power System ◽  
Simulation Model ◽  
Transmission Lines ◽  
Physical Mechanism ◽  
Transient Simulation ◽  
Lightning Strike ◽  
Significant Component ◽  
The Earth ◽  
Model Combining ◽  
The Stability

The double-circuit transmission lines have already been the significant component of power system. Because of the symmetric insulation of the two circuits, the case that both circuits trip out often happens when the tower suffer lightning strike. And it harms the stability of power system and causes serious impacts to power equipments. In this paper, an electric-magnetic transient simulation model was established. Using this model, combining the analysis of physical mechanism of back striking trip-out, the influences of earth resistance, height of tower and length of insulator on the lightning withstand level of back striking (LWLBS) were clarified. The LWLBS of high tower is much low, therefore the relative high tower should be paid more attention to defense the back striking. Reducing the earth resistance and increasing the length of insulator can both upgrade the LWLBS observably. Especially, reducing the earth resistance can enhance the effect of upgrading the LWLBS by increasing the length of insulator.

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.

Study on Dynamic Stability, Commutation Failure of Multi-Infeed HVDC Power Transmission System

2011 ◽  
Vol 347-353 ◽  
pp. 2717-2723
Author(s):  
Zhi Dong Wang ◽  
Lian Guang Liu
Keyword(s):  
Simulation Model ◽  
Dynamic Stability ◽  
Transmission Lines ◽  
Large Scale ◽  
Transmission System ◽  
Simulation Software ◽  
Transient Simulation ◽  
Electromagnetic Transient ◽  
Commutation Failure ◽  
Electromagnetic Transient Simulation

The electromagnetic transient modeling method was presented for the system, the system equivalent and model treatment were also concerned. The EMTDC (electromagnetic transient simulation software) was used to establish the simulation model covered a total of 5 HVDC transmission lines, including a ±800kV UHVDC transmission system from Yunnan to Guangdong. The use of detailed converter model can solve the problem of limitations in previous studies. The research focused on the dynamic stability and commutation failure when kinds of faults occurred in AC/DC system. The result of the work has provided a theoretical foundation for such system, also provided a feasible way for the dynamics study of large-scale multi-infeed HVDC system by using of the electromagnetic transient simulation model.

scholarly journals Lightning Performance of Unshielded 220kV Transmission Lines Equipped with Metal-oxide Arresters

2021 ◽  
Vol 242 ◽  
pp. 03009
Author(s):  
Pengkang Xie ◽  
Zhen Fang
Keyword(s):  
Metal Oxide ◽  
Simulation Model ◽  
Energy Absorption ◽  
Transmission Lines ◽  
Power Supply ◽  
Lightning Strike ◽  
Transmission Tower ◽  
Absorbed Energy ◽  
Lightning Strikes ◽  
Grounding Resistance

Overhead ground wires have been proved to be effective to protect conductors from direct lightning strikes, but breakouts of ground wires have been frequently reported. In order to prevent ground wire breakout incidents to happen, unshielded 220kV lines equipped with metal oxide arresters (MOAs) whole line have been proposed in this paper. After cancelling ground wire, lightning strike risk of transmission lines becomes much higher. In order to improve the anti-lightning abilities of unshielded transmission lines, it is necessary to obtain the lightning energy absorption ability of these MOAs. In this paper, simulation model of MOA equipped unshielded 220kV transmission line was built, the influences of lightning parameters, striking occurrence point and grounding resistance of transmission tower on the absorbed energy of MOAs were calculated, and the suggested energy absorption ability of MOA was given, which can give references for the improvement of power supply reliability of transmission lines.

Effects of GIC in Power System and Control Measures

2012 ◽  
Vol 182-183 ◽  
pp. 676-680
Author(s):  
You Jie Ma ◽  
Dong Fang Wu ◽  
Xue Song Zhou
Keyword(s):  
Power System ◽  
Transmission Lines ◽  
Large Scale ◽  
Geomagnetic Storms ◽  
Neutral Line ◽  
Power Grid ◽  
Electric Power System ◽  
Control Measures ◽  
Long Distance ◽  
The Earth

The geomagnetic storm which is caused by the sun's activity is a global natural disaster. For the transformer neutral line connects to the earth directly, the geomagnetic storms can induce GIC in the loop formed by the earth and the transmission lines with long distance. The GIC has very big effect on the safe operation of electric power system when it flows in power grid. It includes the main damages on power system equipment caused by the GIC, the introduction of the GIC generation principle, main features, analysis algorithm and some control measures in this paper. Finally, point out that the GIC of the long distance transmission system and large-scale power grid should be paid more attention.

scholarly journals Transient Stability Improvement of the Power Systems

2018 ◽  
Vol 12 (3) ◽  
pp. 916
Author(s):  
Zaid H. Al-Tameemi ◽  
Hayder H. Enawi ◽  
Karrar M. Al-Anbary ◽  
Hussam M. Almukhtar
Keyword(s):  
Power Systems ◽  
Power System ◽  
Transmission Lines ◽  
Transient Stability ◽  
Electrical Power ◽  
Limiting Factor ◽  
Stable Operation ◽  
Electric Power Networks ◽  
Matlab Package ◽  
The Stability

<p>During the last few decades, electrical power demand enlarged significantly whereas power production and transmission expansions has been brutally restricted as a result of restricted resources as well as ecological constrains. Consequently, many transmission lines have been profoundly loading so the stability of power system became as Limiting factor for transferring electrical power. So, maintaining a secure and stable operation of the electric power networks is deemed an imporatant and challenge issue.transient stability of a power system has been gained a considerable attention from researchers dute to it importance . Therefore,this paper sheds light on A substantial number of the adopted techniques, including an inclease in  inertia constant of generator, shunt capacitor, reduction reactance of the transmission line to acheive this purpose. A 7-Machine CIGRE system has been considered a case study. Matlab package has been employed to implement this study. The simulation results show that the transient stability of the repective system enhanced considerably with these techniques.</p>

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