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.

scholarly journals Effect of indirect lightning strike to 66kV transmission line in Java-Bali system

2018 ◽  
Vol 197 ◽  
pp. 11001
Author(s):  
Aristo Adi Kusuma ◽  
Putu Agus Aditya Pramana ◽  
Brian Bramantyo S.D.A. Harsono ◽  
Buyung Sofiarto Munir
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
Lightning Strike ◽  
Actual Condition ◽  
Peak Current ◽  
Lightning Strikes ◽  
Detection Systems ◽  
Current Magnitude ◽  
Lightning Detection ◽  
Insulator Flashover

Based on Java-Bali grid disturbance data, the 66kV transmission lines that is close to or intersect with 150kV or 500kV transmission line is often experienced earth fault due to insulator flashover. The insulator flashover can be caused by indirect lightning strike since lightning strikes tend to strike higher structure. Therefore, this paper will determine the effect of indirect lightning strike on 150kV or 500kV transmission line to 66kV transmission line by modeling and simulation using application of transient analysis. Variation of lightning peak current magnitude and gap between 66kV transmission line and transmission line with higher voltage is performed during simulation. The range of peak current magnitude follows the data from lightning detection systems, while the value of gap follows the data from actual condition. It is found that higher current peak and closer gap will cause higher transient overvoltage on insulator of 66kV transmission line thus insulator flashover may occur more frequent. Addition of earth wire on 66kV transmission line and gap between each transmission by organizing the sag of conductor can be performed to minimize the insulator flashover.

Development and Verification of Indirect Lightning-Induced Transient Protection Circuit for Avionics System

2021 ◽  
Vol 36 (6) ◽  
pp. 670-675
Author(s):  
Sung-Yeon Kim ◽  
Jeong-Su Park ◽  
Wang-Sang Lee
Keyword(s):  
Metal Oxide ◽  
Noise Suppression ◽  
Reference Voltage ◽  
Lightning Strike ◽  
Lightning Strikes ◽  
Protection Circuit ◽  
Transient Voltage ◽  
Metal Oxide Varistor

In this paper, an indirect lightning-induced transient protection circuit for avionics system is proposed, and its effectiveness is verified. The proposed circuit consists of a metal oxide varistor (MOV), a transient voltage suppression (TVS) diode, and a resistor. Compared with the conventional circuits (MOV or TVS diode), the improved noise suppression of the proposed circuit against indirect lightning strikes are experimentally verified in accordance with radio technical commission for aeronautics (RTCA) DO-160G Sec. 22. The highest attenuation levels of indirect lightning strike WF5A reference voltage and current signals are approximately 91.0% and approximately 98.4% for the input lightning signals, respectively.

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.

scholarly journals KAJIAN PEMASANGAN LIGHTNING ARRESTER PADA SISI HV TRANSFORMATOR DAYA UNIT SATU GARDU INDUK TELUK BETUNG

2018 ◽  
Vol 9 (2) ◽  
pp. 168-179
Author(s):  
Redaksi Tim Jurnal
Keyword(s):  
Power Supply ◽  
Power Transformer ◽  
Lightning Strike ◽  
Transmission Channel ◽  
Lightning Strikes ◽  
Transformer Protection ◽  
Nominal Voltage ◽  
System Requirements ◽  
Power Centers ◽  
Power Center

Generally, The power centers are connected to the air transmission line, and the airborne transmission channel is susceptible to disturbances that are affected from outside the system, one of which is a lightning strike. Lightning strikes are harmful to the components present in the central power supply. And therefore, the protection from the lightning strikes is required, so that the components in the power center is not damaged when exposed to lightning surges. In this research we discussed the power transformer protection (60MVA) on the Teluk Betung substation so that the power transformer is safe from the over voltage caused by the lightning surge. The specification of the arresters mounted on the HV side of the power transformer unit one of Teluk Betung substation with nominal voltage of 144 kV has been in accordance with the system requirements. The maximum distance between the arrester and the allowable power transformer is 28.5 meters. Distance in the field is 3 meters, the voltage that arrives at the power transformer is 480 kV and still below the Basic insulation level of the transformer, so that the protection of the power transformer against the lightning surge is very good.

scholarly journals Ufer Grounding System to Minimize Risk of Lightning Strike using Concrete Mixed with Bentonite and Coconut Fiber

2020 ◽  
Vol 9 (1) ◽  
pp. 133-140 ◽  
Author(s):  
Yul Martin ◽  
Diah Permata ◽  
Annisa Ulya ◽  
Dikpride Despa ◽  
Marwansyah Marwansyah ◽  
...  
Keyword(s):  
Electrical Engineering ◽  
Lightning Strike ◽  
Coconut Fiber ◽  
Lightning Strikes ◽  
Grounding System ◽  
Grounding Resistance ◽  
Human Safety ◽  
Resistance Value ◽  
Coated Electrodes

The increasing frequency of lightning strikes endangers human safety and life. The grounding system was introduced to face the lightning strikes. This research aimed to understand the changes of grounding resistance value using concrete mixed with bentonite and coconut fiber. The research was conducted in the Laboratory of Electrical Engineering, University of Lampung. The research was started from October 2017 to April 2018. This research used the Ufer grounding system. Concretes with (25 x 25 x 30) cm3 in volume were planted at a depth of 50 cm with copper-coated electrodes that were 16 mm in diameter. 4 concrete was produce with different component T1= concrete, 30% bentonite, T2= concrete, 30% bentonite, 1.5% coconut fiber, T3= concrete, 30% bentonite, 0.75% coconut fiber, T4= concrete + 1.5% coconut fiber. The results show that the lowest grounding resistance values were 45.896 Ω on the concrete with bentonite: cement: sand: gravel = 0.3: 0.7: 2: 4. By adding 1.5% coconut fiber, the grounding resistance value is 3.5 times smaller than the grounding resistance values of the soil (161.2 Ω). Adding bentonite and coconut fiber can decrease the grounding resistance values

scholarly journals Development and Application of Live Replacement of Insulator Suspension Tool Components for Transmission Lines

2019 ◽  
Vol 136 ◽  
pp. 04010
Author(s):  
Ma Jun ◽  
Yu Liang ◽  
Shi Yonggang ◽  
Dong Gang ◽  
Gong Fuxing ◽  
...  
Keyword(s):  
Transmission Lines ◽  
Power Supply ◽  
Operation Mode ◽  
Operation Time ◽  
Benefit Analysis ◽  
Lightning Strikes ◽  
The Stability ◽  
Insulation Performance ◽  
Tool Assembly

Transmission line insulators will reduce the insulation level and become low-value insulators because of lightning flashover. Toughened glass insulators are used in 500kV Tongfeng 1 and 2 lines in Tonghua area. Most umbrella skirts will break and fall off after lightning flashover, which greatly reduces the insulation performance. It needs to be replaced in time, but frequent blackouts will bring great losses and reduce the reliability of power supply. Aiming at the frequent lightning hazards and lightning strikes on transmission lines in Tonghua area, a tool assembly for live replacement of insulators for transmission lines is developed. Through the application of this tool, the live operation mode is adopted to eliminate such defects. The operation time can be arranged and implemented in a very timely manner, which avoids the threat of long-term defects, effectively reduces the outage time of equipment, enhances the stability of power grid, and greatly improves the reliability of power supply of lines. Finally, taking the live line insulator suspension tool as an example, the economic benefit analysis is given, and the feasibility and correctness of the tool are verified..

Electric Field Analysis of 220 kV Composite Material Tower Lines

2012 ◽  
Vol 516-517 ◽  
pp. 1517-1520
Author(s):  
Jian Xun Hu ◽  
Gong Da Zhang ◽  
Hong Yu Zhang ◽  
Xiao Qin Zhang
Keyword(s):  
Composite Material ◽  
Electric Field ◽  
Field Distribution ◽  
Transmission Lines ◽  
Electric Field Distribution ◽  
Field Analysis ◽  
Electric Field Effect ◽  
Transmission Tower ◽  
Element Analysis ◽  
Electric Field Analysis

Using the finite element analysis, this work analyzed the electric field distribution of 220kV transmission steel tower with double-circuit and composite material transmission tower with the same size, and compared the electric field effect of two materials transmission tower for surroundings. And this work compared the vertical and axial electric field distribution along transmission line of the two materials transmission tower. The results indicate the composite material tower can improve the environment of electric field near the transmission lines.

An experimental investigation on mechanical performances of 3D printed lightweight ABS pipes with different cellular wall thickness

2021 ◽  
Vol 15 (2) ◽  
pp. 8169-8177
Author(s):  
Berkay Ergene ◽  
İsmet ŞEKEROĞLU ◽  
Çağın Bolat ◽  
Bekir Yalçın
Keyword(s):  
Compressive Strength ◽  
Energy Absorption ◽  
Wall Thickness ◽  
Lattice Structure ◽  
Honeycomb Structure ◽  
Cellular Structures ◽  
Compression Tests ◽  
Absorbed Energy ◽  
Great Opportunity ◽  
3D Printed

In recent years, cellular structures have attracted great deal of attention of many researchers due to their unique properties like exhibiting high strength at low density and great energy absorption. Also, the applications of cellular structures (or lattice structures) such as wing airfoil, tire, fiber and implant, are mainly used in aerospace, automotive, textile and biomedical industries respectively. In this investigation, the idea of using cellular structures in pipes made of acrylonitrile butadiene styrene (ABS) material was focused on and four different pipe types were designed as honeycomb structure model, straight rib pattern model, hybrid version of the first two models and fully solid model. Subsequently, these models were 3D printed by using FDM method and these lightweight pipes were subjected to compression tests in order to obtain stress-strain curves of these structures. Mechanical properties of lightweight pipes like elasticity modulus, specific modulus, compressive strength, specific compressive strength, absorbed energy and specific absorbed energy were calculated and compared to each other. Moreover, deformation modes were recorded during all compression tests and reported as well. The results showed that pipe models including lattice wall thickness could be preferred for the applications which don’t require too high compressive strength and their specific energy absorption values were notably capable to compete with fully solid pipe structures. In particular, rib shape lattice structure had the highest elongation while the fully solid one possessed worst ductility. Lastly, it is pointed out that 3D printing method provides a great opportunity to have a foresight about production of uncommon parts by prototyping.

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