Improving the protective effect of surge arresters by optimizing the electrical property of ZnO varistors

Meng, Pengfei; Yuan, Chao; Xu, Heng; Wan, Shengpeng; Xie, Qingyun; He, Jiaqing; Zhao, Hongfeng; Hu, Jun; He, Jinliang

doi:10.1016/j.epsr.2019.106041

Cited by 20 publications

(11 citation statements)

References 15 publications

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“…It consists of two steps. First, we solve Equations (12) and (16) for the unknowns v n+1 and i n+1 through a linear tri-diagonal system as in Equation (6). The matrix A is left unchanged regardless the possible presence of surge arresters; this is done by replacing the current generatorŝ i mov in Equation (16) with their approximation i n mov at the previous time-step t = n∆t.…”

Section: Mov Numerical Modelmentioning

confidence: 99%

“…First, we solve Equations (12) and (16) for the unknowns v n+1 and i n+1 through a linear tri-diagonal system as in Equation (6). The matrix A is left unchanged regardless the possible presence of surge arresters; this is done by replacing the current generatorŝ i mov in Equation (16) with their approximation i n mov at the previous time-step t = n∆t. Then, we use the current values i n+1 k± 1 2 at the N span + 1 tower nodes to solve the non-linear Equations (14) and (16) and compute the MOVs variables, update the v n+1 k voltages at the tower nodes, and compute the current generators i n+1 mov to be used at the successive time-step.…”

Section: Mov Numerical Modelmentioning

confidence: 99%

“…According to recent studies [15], overvoltage limiting devices consisting of surge arresters or Metal Oxide Varistor (MOV) [16] arresters can be effectively located along the power lines. Optimized surge arrester allocation based on genetic algorithm or other techniques have been proposed (e.g., [17]).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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Section: Mov Numerical Modelmentioning

confidence: 99%

Section: Mov Numerical Modelmentioning

confidence: 99%

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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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“…Diversity of structures and the excellent physical properties of metal oxide (MO) semiconductors offer a wide range of favorable features to be used in plethora of optoelectronic devices [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Multifractal analysis of ZnO thin films doped with Mg deposited by sol-gel spin coating on a glass substrate

Ţălu

Boudour

Bouchama

et al. 2021

Preprint

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A multifractal analysis has been performed on the three-dimensional surface microtexture of the ZnO thin films doped with Mg deposited by sol-gel spin coating on glass substrates. The effects of Mg doping element with amounts of 0, 2, 4, and 5 % on structural and morphological properties of the coated films were investigated. From the X-ray diffraction pattern analysis, it was found that the obtained thin films had a polycrystalline hexagonal wurtzite structure with preferential c-axis orientation and increased grain size with increasing the Mg doping. From scanning electron microscopy (SEM) analysis, it can be concluded that the surface of coated thin films had dense and uniformly distributed grains of nanoscale without any cracks over all surfaces of coated firms. From atomic force microscope (AFM) analysis, it can be also concluded that the surface of coated thin films had a dense columnar grain growth uniformly distributed over the entire 1 µm ⋅ 1 µm - scanned area. The surface microtexture was characterized in terms of multifractal analysis.

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“…In the literature, there exist several works that either only conventional surge arresters are considered to protect MV transformers against lightning, or some external or internal modifications are made aiming at enhancing the protective performance of surge arresters. In internal modifications, the microstructure and electrical properties of surge arresters are optimized to withstand different overvoltage conditions [12][13][14][15]. In external modifications, which is the focus of our work, more often than not, only other protective devices are combined with surge arresters, or different sides of the transformer are chosen for installing the surge arresters aiming at enhancing the protection outcome [6].…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Protective Performance of Surge Arresters against Indirect Lightning Strikes via an Inductor-Based Filter

Pourakbari‐Kasmaei

Lehtonen

2020

Energies

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Preventing the medium voltage (MV) transformer fault by protecting transformers against indirect lightning strikes plays a crucial role in enhancing the continuous service to electricity consumers. Surge arresters, if selected properly, are efficient devices in providing adequate protection for MV transformers against transient overvoltage impulses while preventing unwanted service interruptions. However, compared to other protective devices such as the spark gap, their prices are relatively high. The higher the surge arrester rating and energy absorption capacity are, the higher the prices go. This paper proposes an inductor-based filter to limit the energy pushed into the surge arrester, and consequently to prevent any unwanted failure. An energy-controlled switch is proposed to simulate the fault of the surge arrester. Surge arresters with different ratings, e.g., 12 kV, 18 kV, 24 kV, 30 kV, 36 kV, and 42 kV with two different classes of energy, namely, type a and type b, are tested under different indirect lightning impulses such as 100 kV, 125 kV, 150 kV, 175 kV, 200 kV, 250 kV, 300 kV, and 500 kV. Furthermore, these surge arresters are equipped with different filter sizes of 100 μH, 250 μH, 500 μH, and 1 mH. Results prove that equipping a surge arrester with a proper filter size enhances the performance of the surge arrester significantly such that a high rating and somewhat expensive surge arrester can be replaced by a low rating and cheap surge arrester while providing similar or even better protective performance for MV transformers. Therefore, such configurations not only enhance the protective capability of surge arrester, but also reduce the planning and operating costs of MV networks.

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Improving the protective effect of surge arresters by optimizing the electrical property of ZnO varistors

Cited by 20 publications

References 15 publications

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

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

Multifractal analysis of ZnO thin films doped with Mg deposited by sol-gel spin coating on a glass substrate

Enhancing the Protective Performance of Surge Arresters against Indirect Lightning Strikes via an Inductor-Based Filter

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