Analysis of the effectiveness of shield wires in mitigating lightning-induced voltages on power distribution lines

Piantini, Alexandre

doi:10.1016/j.epsr.2017.08.022

Cited by 42 publications

(24 citation statements)

References 18 publications

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“…Practical solutions might be renovating and modifying the construction of the equipment or optimal allocation of protection devices. The importance of enhancing the protection of power system equipment against lightning resulted in opening several areas of research [3][4][5][6][7][8]. Li et al, in [3], provided adequate information on the usage of the lightning rod, while [4][5][6][7][8] mainly discussed the arrangements and effectiveness of shield wire on direct and indirect lightning overvoltages protection.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Filtered Spark Gap on the Lightning Protection of Distribution Transformers: Experimental and Simulation Study

et al. 2020

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Protection of transformers, as one of the most expensive equipment in the power system, against lightning overvoltage impulses is a vital task. This paper, for the first time so far, investigates the effects of a filtered spark gap on the protection level of transformers against lightning overvoltage impulses. The filter is an inductor that is placed in series with the transformer and before the spark gap aiming to reduce the voltage at the connection point of the spark gap, and hence, enhancing the protection level of the transformer under lightning overvoltages. The experimental laboratory tests are accomplished on a 400 kVA, 22/0.4 kV, Delta-Star ( Δ − Y ) connection type transformer under 110 kV, and 125 kV overvoltage impulses, whereas the size of the spark gap is set to 80 mm and two inductors of 35 μ H and 119 μ H are considered. In order to perform a more in-depth analysis, a model that works reasonably close to the empirical case is developed in the EMTP-RV software. An optimization algorithm is used to determine the sensitive parameters of the double-exponential function, which is used to reproduce the applied laboratory lightning impulse voltages in the EMTP-RV environment. Moreover, the transformer is modeled according to the Cigre Guidelines (Working Group 02 of Study Committee 33). The behavior of the spark gap is simulated as close as the practical situation using the disruptive effect method. The preciseness of the simulated filtered spark gap model is verified by comparing the results of the simulated model in the EMTP-RV with the results of experimental tests. After verifying the model, different sizes of inductors are studied in the EMTP-RV environment to investigate whether larger or smaller inductors provide better protection for the transformer under lightning conditions. A comparison is performed among the conventional spark gap, surge arrester, and the filtered spark gap to provide a better analysis of the potential of the proposed device. The results indicate that proper sizing of the inductor, within an effective range, slightly enhances the protection level of the transformer.

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Section: Introductionmentioning

confidence: 99%

Evaluation of Filtered Spark Gap on the Lightning Protection of Distribution Transformers: Experimental and Simulation Study

et al. 2020

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“…The great impact of lightning-induced over voltages on the performance and energy quality of distribution systems motivated several studies to better understand their characteristics and to evaluate the effectiveness of the methods that can be used for their mitigation [4][5][6][7][8][9]. The voltages amplitudes and waveforms vary widely and depend on various parameters of the lightning current, the soil resistivity, and the network configuration [1,2,7,8,10,11], but for the analysis of the indirect lightning performance of distribution lines, as well as for the evaluation of the effectiveness of the possible protection measures, it is of great importance to know their main characteristics [1]. Also essential is to understand how power equipment behave when subjected to lightning surges with non-standard wave shapes [12,13].…”

Section: Introductionmentioning

confidence: 99%

Characteristics of lightning‐induced voltages based on experimental data

Santos

Piantini

2020

High Voltage

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This paper presents an analysis of 64 lightning‐induced voltage waveforms recorded in an experimental system implemented in the campus of the University of São Paulo, Brazil. The voltages were measured on a 10 m high, 2.7 km long un‐energized overhead line consisting of two conductors installed on 6 m crossarms. One of the conductors had surge arresters, while the other one was left unprotected. Strictly speaking, all the recorded voltages on the unprotected conductor were bipolar, but in many cases only one semi‐cycle could be considered important for practical purposes. Different criteria are discussed for the determination of the waveshape parameters, which may differ significantly from those of the standard lightning impulse voltage (1.2/50 μs). Based on the proposed criterion for classifying the induced voltages, unipolar waveforms accounted for 67% of the total and, except for one case, all of them had positive polarity. The median values of the front time and time‐to‐half‐value were, respectively, 5.2 μs and 15.8 μs. Bipolar waveforms were 33% of the total and in approximately 62% of the cases the first semi‐cycle was of positive polarity. In 91% of the cases the voltage peak occurred either in the first or the second semi‐cycle.

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“…All of these studies indicate that lightning-induced voltages' amplitudes and waveshapes vary widely. This is expected, as they depend significantly on the characteristics of the soil and the stroke current, the relative position of the line and stroke location, the observation point, and the network configuration [1], [2], [14] - [19]. Due to the different line lengths, configurations, and termination conditions, in most of the cases the lightning-induced voltages obtained in different experimental studies cannot be compared directly.…”

Section: Wang Et Al Analyzed Inmentioning

confidence: 99%

“…The incidence of lightning flashes to nearby elevated objects and the occurrence of upward leaders can also be considered [67], as well as the presence of equipment such as transformers and surge arresters [18]. The effect of a multigrounded conductor is evaluated by calculating the currents that flow to ground at the various grounding points taking into account the multiple reflections and, then, the voltages associated with these currents that, due to the coupling between the wires, are induced on the phase conductors [14]. The ERM has been validated with experimental data obtained using different techniques: rocket-triggered lightning, lightning flashes to instrumented towers, and reduced scale modeling [10], [18], [56], [67].…”

Section: The Extended Rusck Model (Erm)mentioning

confidence: 99%

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Análise de tensões induzidas por descargas atmosféricas medidas em uma linha experimental aérea casada

Santos¹

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I would like to thank the Universidade Federal do Amapá (Unifap) for the opportunity granted to qualify for a doctorate and to fully withdraw from the position of professor, as well as to all of the Electrical Engineering collegiate who supported me, especially Prof.Alaan Ubaiara and Prof. Kellen Gomes.I thank my family for always being present in my life, my parents, Pedro Paulo and Rosemeire, for the education given to me, and immense gratitude to Aline Thiele who knew how to be a great companion when I could not be there and who gave me the strength to stay focused. I would like to thank my great friend Hellen Paiva for her help in developing the LabVIEW program, which was used as a tool for the development of this Ph.D. Dissertation, without her contribution it would not have the same level of quality. I would like to thank the CENDAT Group, Engineers Acácio Neto and Milton Shigihara who welcomed me on my admission, explaining the experimental system, clearing up my doubts whenever they arose. And Prof. Dr. Arnaldo G. Kanashiro for encouraging my studies, and I also thank Diana for everything I learned with her help and friendship. Finally, I would like to thank the Institute of Energy and the Environment of the University of São Paulo, which provided the conditions for the development of this work, the Financier of Studies and Projects (FINEP), Companhia Paulista de Força e Luz (CPFL) and Rio Grande Energia (RGE), who provided financial support for the development of the two experimental systems (USP/SP System: CPFL Support and URI system: RGE, CPFL and FINEP support)."If you don't know, the thing to do is not to get scared, but to learn."

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Analysis of the effectiveness of shield wires in mitigating lightning-induced voltages on power distribution lines

Cited by 42 publications

References 18 publications

Evaluation of Filtered Spark Gap on the Lightning Protection of Distribution Transformers: Experimental and Simulation Study

Evaluation of Filtered Spark Gap on the Lightning Protection of Distribution Transformers: Experimental and Simulation Study

Characteristics of lightning‐induced voltages based on experimental data

Análise de tensões induzidas por descargas atmosféricas medidas em uma linha experimental aérea casada

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