Evaluation of the Mitigation Effect of the Shield Wires on Lightning Induced Overvoltages in MV Distribution Systems Using Statistical Analysis

Brignone, Massimo; Mestriner, Daniele; Procopio, Renato; Piantini, Alexandre; Rachidi, Farhad

doi:10.1109/temc.2017.2779184

Cited by 39 publications

(19 citation statements)

References 28 publications

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“…The literature review shows that not only the aforementioned works but also, to the best of our knowledge, the other existing works solely focus on optimally designing, installing, and operating the commonly-used overvoltage protection devices. On the other hand, the medium voltage distribution lines and, more specifically, the lines up to 20 kV that do not have a shielding wire are more likely to be struck by direct lightning [21], while having the shield wire also mitigates the lightning-induced overvoltages of MV networks effectively [5]. Therefore, some modification in the existing protection devices is required to protect the transformers against direct lightning.…”

Section: Of 23mentioning

confidence: 99%

“…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%

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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: Of 23mentioning

confidence: 99%

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 OHSWs are grounded at some poles by a constant equivalent ground admittance G g . Propagation along the ground lead and its electrical parameters are neglected here [39].…”

Section: Numerical Formulationmentioning

confidence: 99%

Analysis of Metal Oxide Varistor Arresters for Protection of Multiconductor Transmission Lines Using Unconditionally-Stable Crank–Nicolson FDTD

et al. 2020

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Surge arresters may represent an efficient choice for limiting lightning surge effects, significantly reducing the outage rate of power lines. The present work firstly presents an efficient numerical approach suitable for insulation coordination studies based on an implicit Crank–Nicolson finite difference time domain method; then, the IEEE recommended surge arrester model is reviewed and implemented by means of a local implicit scheme, based on a set of non-linear equations, that are recast in a suitable form for efficient solution. The model is proven to ensure robustness and second-order accuracy. The implementation of the arrester model in the implicit Crank–Nicolson scheme represents the added value brought by the present study. Indeed, its preserved stability for larger time steps allows reducing running time by more than 60 % compared to the well-known finite difference time domain method based on the explicit leap-frog scheme. The reduced computation time allows faster repeated solutions, which need to be looked for on assessing the lightning performance (randomly changing, parameters such as peak current, rise time, tail time, location of the vertical leader channel, phase conductor voltages, footing resistance, insulator strength, etc. would need to be changed thousands of times).

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“…Their protection requires an accurate evaluation of the insulation coordination system [2] as well as a correct computation of the number of dangerous events striking the line per year. The latter parameter is usually computed through the lightning performance procedure-a high number of lightning events, each of them characterized by different parameters extracted from their own Probability Density Function (PDF), is generated and their effects on the power system are computed through a simplified method [1,3,4] or through a numerical code [5][6][7][8][9]. The number of events that exceeds a threshold value depending on the line Critical Flashover value (CFO) is considered dangerous.…”

Section: Introductionmentioning

confidence: 99%

Corona Effect Influence on the Lightning Performance of Overhead Distribution Lines

Mestriner

Brignone

2020

Applied Sciences

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Overhead distribution lines can be seriously damaged from lightning events because both direct and indirect events can cause flashovers along the line. The lightning performance of such power lines is usually computed neglecting the effect of corona discharge along the conductors: in particular, the corona discharge determined by the indirect lightning event is taken into account only by few researchers because it can have meaningful impacts only in few cases. However, when we deal with overhead distribution lines with high Critical Flashover value (CFO) and small diameters, the corona discharge caused by indirect events has to be taken into account. This paper shows the effects of corona discharge in the lightning performance computation of overhead distribution lines. The analysis will involve different configurations in terms of line diameter and air conditions, focusing on the negative effect of corona discharge in the number of dangerous events that determine line flashovers.

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Evaluation of the Mitigation Effect of the Shield Wires on Lightning Induced Overvoltages in MV Distribution Systems Using Statistical Analysis

Cited by 39 publications

References 28 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

Analysis of Metal Oxide Varistor Arresters for Protection of Multiconductor Transmission Lines Using Unconditionally-Stable Crank–Nicolson FDTD

Corona Effect Influence on the Lightning Performance of Overhead Distribution Lines

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