Relevant bibliographies by topics / Switching overvoltage

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Switching overvoltage'

Author: Grafiati
Published: 4 June 2021
Last updated: 16 June 2025

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Journal articles on the topic "Switching overvoltage"

1

Keitoue, Samir, Ivan Murat, Božidar Filipović-Grčić, Alan Župan, Ivana Damjanović, and Ivica Pavić. "Lightning caused overvoltages on power transformers recorded by on-line transient overvoltage monitoring system." Journal of Energy - Energija 67, no. 2 (2022): 44–53. http://dx.doi.org/10.37798/201867279.

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Transient overvoltages generated by lightning strikes or switching operations represent a significant risk to bushings and windings of power transformers. They cause stress on the insulation system and can, over time, cause dielectric failure and damage to power transformers. Many transformer failures are reported as dielectric failures and they are not necessarily linked to any particular event when they occur but may be the result of prior damage from transient overvoltage events. Lightning and switching overvoltage waveforms appearing at transformer terminals in real operating conditions may significantly differ from standard impulse voltage waveforms used during laboratory testing. The number and amplitudes of overvoltages which stress the insulation depend on various parameters such as the lightning strike density in the considered area, since it determines how often the transformer is stressed by lightning overvoltages. Since the overvoltage amplitudes at transformer terminals are usually unknown, an on-line overvoltage transient recorder can be used with the ability to sample, analyse and store transients in real-time. In this paper, an on-line transient overvoltage monitoring system (TOMS) for power transformers is presented that is capable to continuously record in real-time various kinds of transient overvoltages such as lightning or switching overvoltages. Special attention is paid to lightning caused transient overvoltages recorded at the terminals of 150 MVA power transformer. Recorded waveforms originating from lightning strikes to overhead lines are correlated with data from the lightning location system (LLS) and supervisory control and data acquisition (SCADA) system. Collected data about overvoltage stresses can be used as the basis for the assessment of the transformer insulation condition, estimation of health index and for analysis of various kinds of events such as faults or equipment failures.
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Furgał, Jakub, Maciej Kuniewski, and Piotr Pająk. "Analysis of Internal Overvoltages in Transformer Windings during Transients in Electrical Networks." Energies 13, no. 10 (2020): 2644. http://dx.doi.org/10.3390/en13102644.

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Due to the increasing requirements for the reliability of electrical power supply and associated apparatus, it is necessary to provide a detailed analysis of the overvoltage risk of power transformer insulation systems and equipment connected to their terminals. Exposure of transformer windings to overvoltages is the result of the propagation condition of electromagnetic waves in electrical networks and transformer windings. An analysis of transformer winding responses to transients in power systems is of particular importance, especially when protection against surges by typical overvoltage protection systems is applied. The analysis of internal overvoltages in transformers during a typical transient related to switching operations and selected failures is of great importance, particularly to assess the overvoltage exposure of insulation systems in operating conditions. The random nature of overvoltage phenomena in electrical networks implies the usage of computer simulations for the analysis of overvoltage exposures of electrical devices in operation. This article presents the analysis of the impact of transient phenomena in a model of a medium-voltage electrical network during switching operations and ground faults on overvoltages in the internal insulation systems of transformer windings. The basis of the analysis is simulations of overvoltages in the windings, made in the Electromagnetic Transients Program/Alternative Transients Program (EMTP/ATP) using a model with lumped parameters of transformer windings. The analysis covers the impact of the cable line length and the ground fault resistance value on internal overvoltage distributions.
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Al-Tak, Mazyed A., Mohd Fadzil Ain, Omar Sh Al-Yozbaky, and Mohamad Kamarol Mohd Jamil. "Effect of shunt reactor rating on the switching transients overvoltage in high voltage system." Bulletin of Electrical Engineering and Informatics 13, no. 1 (2024): 38–49. http://dx.doi.org/10.11591/eei.v13i1.6100.

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This paper includes a computer simulation of switching transient overvoltages during the disconnecting of shunt reactors (SR). Based on the results of the transient simulations, two reactors (150 MVAr and 50 MVAr) were examined. Reactor current interruption causes significant overvoltages, especially across the reactor and the circuit breaker (CB). The severity of these overvoltages may surpass the voltage level, which might endanger the reactor’s insulation and accelerate the CBs ageing process. For this reason, a significantly modified circuit model is proposed. The results of the field testing showed that the proposed modified circuit technique was successful. The transient overvoltages were computed using ATP-draw simulations of the equivalent circuit during switching. Successful synchronous switching could decrease the electromagnetic and mechanical stress generated during frequent switching operations. The model was examined the switching transient overvoltage for different values of current chopping (0-20) A. The proposed model proved that the reduction of the overvoltage was 86% in case of (50 MVAr) shunt reactor rating and 87% in case of (150 MVAr) shunt reactor rating.
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Zhang, Wen, Zhe Yu Zhang, Fred Wang, Leon M. Tolbert, Daniel Costinett, and Benjamin Blalock. "Characterization and Modeling of a SiC MOSFET’s Turn-Off Overvoltage." Materials Science Forum 924 (June 2018): 827–31. http://dx.doi.org/10.4028/www.scientific.net/msf.924.827.

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The overvoltage during hard switching limits the full utilization of devices due to higher blocking voltage requirement. The faster switching speed of SiC MOSFET worsens the trade-off, and the understanding of the overvoltage’s mechanism is crucial for the better utilization. In this paper, experimental characterizations on the influence of circuit parasitic parameters and gate resistances on overvoltage are performed. Furthermore, a SPICE-based device behavioral model is built and found to able to accurately predict the overvoltage. The same method could be applied to device rating selection in converter design.
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Florkowski, Marek, Jakub Furgał, Maciej Kuniewski, and Piotr Pająk. "Overvoltage Impact on Internal Insulation Systems of Transformers in Electrical Networks with Vacuum Circuit Breakers." Energies 13, no. 23 (2020): 6380. http://dx.doi.org/10.3390/en13236380.

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Vacuum circuit breakers are increasingly used as switching apparatus in electric power systems. The vacuum circuit breakers (VCBs) have very good operating properties. VCBs are characterized by specific physical phenomena that affect overvoltage exposure of the insulation systems of other devices. The most important phenomena are the ability to chop the current before the natural zero crossing, the ability to switch off high-frequency currents, and the rapid increase in dielectric strength recovery. One of the devices connected directly to vacuum circuit breakers is the distribution transformer. Overvoltages generated in electrical systems during switching off the transformers are a source of internal overvoltages in the windings. The analysis of the exposure of transformers operating in electrical networks equipped with vacuum circuit breakers is of great importance because of the impact on the insulation systems of switching overvoltages (SO). These types of overvoltages can be characterized by high maximum values and atypical waveforms, depending on the phenomena in the circuit breaker chambers, system configuration, parameters of electrical devices, and overvoltage protection. Overvoltages that stress the internal insulation systems are the result of the windings response to overvoltages at transformer terminals. This article presents an analysis of overvoltages that stress the transformer insulation systems, which occur while switching off transformers in systems with vacuum circuit breakers. The analysis was based on the results of laboratory measurements of switching overvoltages at transformer terminals and inside the winding, in a model medium-voltage electrical network with a vacuum circuit breaker.
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Belsky, R. A., V. Y. Frolov, R. I. Zhiligotov, and E. P. Safonov. "Peducing the frequency of switching overvoltage in generator networks." Power engineering: research, equipment, technology 26, no. 3 (2024): 96–107. http://dx.doi.org/10.30724/1998-9903-2024-26-3-96-107.

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THE PURPOSE of the study is to study the problem of switching overvoltages in 10 kV generator networks. Using the Matlab Simulink package, create a model of common auxiliaries of a 10/0.4 kV power station, calculate the overvoltage at different sections of the current, evaluate the effect of vacuum switches on each other, evaluate the effectiveness of nonlinear overstrain limiters, with parallel switching.THE SCIENTIFIC SIGNIFICANCE consists in obtaining a method for calculating transients with simultaneous switching of several switches. THE PRACTICAL SIGNIFICANCE lies in the possibility of using the resulting model for a more accurate selection of protective equipment.METHODS. To create a model of common auxiliaries of 10/0.4 kV and the calculations of transition processes, it used a Matlab Simulink package. RESULTS. The article discusses switching overvoltages in their own needs of 10/0.4 kV. The influence of parallel switching of vacuum circuit breakers on the increase in the multiplicity of overvoltages is estimated. The influence of the specific energy intensity of nonlinear surge limiters on the multiplicity of overvoltages was also evaluated.CONCLUSION. This model showed that the parallel switching of two vacuum circuit breakers can increase the frequency of overvoltage by 20-40 %, which can lead to an increase in wear of both insulation of the protected equipment and the probability of re-breakdown in a vacuum chamber. Moreover, the higher the current cut, the higher the increase in the frequency of the overstrain, the multiplicity will also increase if the shutdown time between the switches is reduced. The main means of protection against switching overvoltages is a non -linear overstrain limiter, but when they are selected, the nominal working voltage is primarily taken into account, which leads to the fact that the increase in the frequency of overstrain from parallel switching can level the effectiveness of a nonlinear limiter.
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Lyakhomskii, A. V., S. V. Kuzmin, S. V. Petukhov, and A. P. Kudryashov. "Accident rate dynamics and enhanced phase-to-ground fault protection in 6-10 kv network and electrics in open pits and quarries." Mining informational and analytical bulletin, S64 (October 20, 2018): 134–44. http://dx.doi.org/10.25018/0236-1493-2018-12-64-134-144.

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At the current development stage of power supply in mines, the main causes of emergency power cutoffs are connected with phase-to-ground faults which are 3.9 times more often than short-circuits. This article analyzes origins of phase-to-ground faults and short-circuits in 6-10 kV networks in mines. The main causes are switching overvoltage, overvoltage under phase-to-ground faultо and natural ageing of insulation. It is shown that over a period of 2005 to 2015, once secondary switching overvoltages became one of the main causes of phase-toground faults. The authors emphasize the requirement of efficient limitation of switching overvoltages while reduction in grouped de-energization needs effective decrease in switching overvoltages under phase-to-ground faults and 100% selectivity of protections. Furthermore, phase-to-ground faults in 6-10 kV networks of quarries and open pit coal mines contributes to natural insulation aging governed by process and climatic factors. In terms of Chernogorsky open pit coal mine, the correlation dependence is obtained between total number of emergency power cutoffs and operation life. It is highlighted that the period of 2016 to 2018 shows a trend of reduction in phase-to-ground faults and short-circuits by 9 and 13%, respectively.
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Leman, Jon T., and Robert G. Olsen. "Bulk FDTD Simulation of Distributed Corona Effects and Overvoltage Profiles for HSIL Transmission Line Design." Energies 13, no. 10 (2020): 2474. http://dx.doi.org/10.3390/en13102474.

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Power system load growth and transmission corridor constraints are driving industry activity in the area of high surge impedance loading (HSIL). Examples include compact structure design and uprating existing transmission lines. Recent research relating electric field uniformity to transmission line capacity and critical flashover voltage underscored the need for better overvoltage data to quantify insulation margins for HSIL design. To that end, this work extends the finite difference time domain (FDTD) method with distributed corona losses to transmission lines with bundled conductors. The model was adapted for practical use in high-volume statistical transient simulation and applied to an example 500 kV line. Transients included line energization and trapped charge reclosing. Overvoltage profiles and statistical distributions were generated from 9500 simulations obtained by random breaker close timing and variation in line length and altitude. Distributed corona losses reduced 98th percentile line-to-ground switching overvoltages by 4%–14% of nominal. The estimated line-to-ground switching surge flashover probability was 54%–80% lower with corona loss. Corona had less impact on line-to-line overvoltages, but the effects were still notable. Results highlight the importance of considering detailed overvoltage profiles and accounting for corona loss attenuation when seeking to carefully quantify insulation design margins.
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Bayu Lopari, Argia, Zulhajji Zulhajji, and Yunus Tjandi. "ANALYSIS OF TRANSIENT OVERVOLTAGES DUE TO LIGHTNING SURGES AT 150KV MAKALE TANA TORAJA SUBSTATION." Jurnal Media Elektrik 22, no. 2 (2025): 167–77. https://doi.org/10.59562/metrik.v22i2.4508.

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Transient overvoltage is a phenomenon in the power system that can be caused by lightning or switching surges. These overvoltages have large amplitudes and short durations, potentially damaging equipment, especially the Circuit Breaker, leading to failure in power distribution. As such, analyzing transient overvoltage is critical for understanding its impact and for designing systems that can withstand such surges. This study investigates transient overvoltages at PT PLN (Persero) 150 kV Makale Tana Toraja Substation, calculating the highest possible transient overvoltage that could affect Circuit Breakers. The research employs a quantitative descriptive approach with an Ex-Post Facto design, using the lattice diagram method to analyze the transient overvoltage behavior. Findings reveal that the highest recorded transient overvoltage was 227.231 kV, with values decreasing as the distance from the lightning strike increases. Furthermore, calculations suggest that in the case of properly functioning arresters, transient overvoltage values at Circuit Breakers 1 and 2 are 512.33 kV and 542.514 kV, respectively. However, if the arresters are damaged, these values increase significantly to 1031.94 kV and 1028.814 kV. This study emphasizes the importance of maintaining functional lightning arresters to ensure protection system efficacy. By optimizing the design and operational parameters of protection equipment, this research contributes to strengthening the resilience of substations, ensuring the safety and reliability of critical infrastructure in areas prone to lightning strikes.
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Lobodzinskiy, Vadim, Nikolay Buryk, Lyudmila Spinul, Valeriy Chibelis, and Olga Illina. "Reduction of Overvoltages under Connection on a High-Voltage Cable Line Due to Optimal Controlled Switching." Problems of the Regional Energetics, no. 3(59) (August 2023): 25–32. http://dx.doi.org/10.52254/1857-0070.2023.3-59.03.

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The purpose of the work is to develop a mathematical model of a cable transmission line, which allows modeling and choosing the optimal conditions for controlled switching to limit overvoltage at the development and design stage. The goal is achieved by solving the problem of determining the initial angle of each phase, so that each phase has an initial switching angle equal to zero with a time delay. A high-voltage cable line for a voltage of 330 kV, implemented using Matlab, has been chosen as the object of study. The most significant result is the method of numerical simulation of the cable line that allows you to analyze transients when each phase of a three-phase cable line is connected to a three-phase source with a time delay, the switching angle of all phases is zero. This, in turn, makes it possible to limit switching overvoltages. The significance of the results obtained lies in the possibility of the proposed technique to choose the optimal conditions for controlled switching, which makes it possible to use it in the design of switching nodes, as well as the use of controlled switching to eliminate unwanted electrical transients during planned switching. The simulation results showed that the greatest effect of using numerical simulation is when each phase of a three-phase cable line is connected to a three-phase source with a time delay of 1/150 second, then the switching angle of all phases is zero, which makes it possible to limit switching overvoltages. Keywords: three-phase cable line, switching overvoltage, transient processes, controlled switching, theory of multipoles, modeling of electrical engineering objects.
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Dissertations / Theses on the topic "Switching overvoltage"

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Guneri, Melih. "Reduction Of Switching Overvoltages By Means Of Controlled Switching." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607505/index.pdf.

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This thesis analyses the controlled switching methods applied to modern SF6 type circuit breakers for the purpose of reducing switching overvoltages. Main emphasis is placed on controlled switching methods applied at extra high voltage level, since the cost of failures caused by switching overvoltages is highest in this voltage level. After a brief introduction about circuit breakers in general, switching overvoltages and controlled switching methods are analysed. Also a case study about controlled switching of an unloaded overhead line is provided, and success of controlled switching method is evaluated.
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Ölund, Martin. "Electrical Surge Protection at Hydropower Plants." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-310318.

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Hydropower plants contains a lot of vital electrical power technology such as generators and transformers. To prevent damage to this equipment due to overvoltage, they are often protected by surge arrester and in some cases also by surge capacitors. The design and dimension of these components vary between different sites and regions and are often done using a template without considering the actual conditions of the site. In this thesis Simulink and Simscape Power System are used to study the case when a hydropower station is exposed to overvoltage. One of Fortum’s hydropower stations is simulated when being exposed to lightning and switching overvoltage to see how the existing overvoltage protection handles this stress. The results show that the surge arresters mounted in front of the generator managed to keep it safe for all overvoltage scenarios it is exposed to. They also shows that the surge capacitors mounted in front of the generator reduces the gradient of the overvoltage surge. However, as the surge arresters already keeps the overvoltage at safe levels, there is no need of reducing the overvoltage gradient and the surge capacitors becomes excessive in this particular hydropower plant.<br>Vattenkraftverk innehåller många vitala komponenter så som generatorer och transformatorer. För att skydda dessa oftast väldigt dyra komponenter mot överspänningar, används ventilavledare och ibland också överspänningskondensatorer. Utformning och dimensionering av skydden varierar mellan olika anläggningar och regioner. Dimensioneringen av skydden görs ofta schablonmässigt, utan någon väsentlig anpassning till de faktiska förhållandena. I detta examensarbete används simuleringsverktyget Simulink tillsammans med tillägget Simscape Power Systems för att simulera vad som händer när ett vattenkraftverk utsätts för olika överspänningar. Ett av Fortums vattenkraftverk studeras när det utsätts för blixt- och kopplingsöverspänningar för att se vad ventilavledarna samt överspänningskondensatorerna i denna anläggning fyller för funktion. Resultaten visar att ventilavledarna monterade framför generatorn klarar av att hantera alla överspänningar de utsätt för under simuleringarna. Resultaten visade också att överspänningskondensatorerna monterade framför generatorn sänker spänningsgradienten, men eftersom ventilavledarna redan håller spänningen på en säker nivå blir överspänningskondensatorerna överflödiga i denna station.
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Elmas, Erinc Evren. "Protection Of Transmission Lines Against Switching Overvoltages." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/2/12605607/index.pdf.

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Any switching action or lightning stroke on a transmission system causes excessive of voltage, which are propagated through the equipment. The withstand capability of the electrical equipment to these overvoltages is dependent on the rate of rise, peak value and the duration of these overvoltages and are especially critical to information technology (IT) equipment. Whenever there is a probability of these overvoltages appearing across the electrical equipment, they should be limited to a safe value by the application surge arresters of the metal oxide type. However, surge arresters are expensive, an optimal location for these should be found so as to minimise the number of surge arresters used.
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Garbelotti, Marcus Vinicius. "Sistema digital para manobra sincronizada de disjuntores - estudo e especificação funcional." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/3/3143/tde-05092006-133417/.

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Nesta dissertação, discorre-se sobre manobra sincronizada de disjuntores. Entre as atividades desenvolvidas para a sua elaboração estão a análise de transitórios causados por manobras em capacitores, reatores e linhas de transmissão, estudos de sobretensão e estudos para a determinação de instantes favoráveis às manobras, sob o ponto de vista de diminuição de sobretensões. Completa a dissertação a especificação de equipamento de sincronismo que, a partir de medições em tempo real de variáveis elétricas - que interferem nas sobretensões - e de variáveis climáticas - que interferem no tempo de acionamento dos contatos dos disjuntores - calculam o tempo de atraso necessário para o fechamento elétrico em instantes mais convenientes.<br>The scope of this dissertation is the study of synchronized switching of circuit breakers. The transients caused by capacitor, reactor and transmission line switching are analyzed, for overvoltage evaluation and to determined the favorable time in the wave that leads to smallest overvoltages. Finally the specification of an equipment is produced. The equipment acquire, in real time, the values of electrical variables (current and voltages) the ambient temperature and oil pressure in the circuit breaker operating mechanism, voltage in the auxiliary system and assign a delay in the breaker switching time in order to control overvoltages.
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Gregory, Raquel Cristina Filiagi. "Análise computacional do desempenho de estratégia para o religamento controlado de linhas de transmissão." Universidade Federal de Uberlândia, 2016. https://repositorio.ufu.br/handle/123456789/17617.

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Conselho Nacional de Desenvolvimento Científico e Tecnológico<br>A busca por soluções mitigatórias, no que tange aos efeitos das sobretensões transitórias atreladas às manobras de energizações e religamentos das linhas de transmissão, contemplam um tema desafiador e com fortes impactos sobre a coordenação de isolamento dos sistemas elétricos. Muito embora o reconhecimento de propostas clássicas e comerciais para a atenuação destes fenômenos, outras possibilidades, certamente, ainda são meritórias de destaque e investigações. Neste contexto, a presente dissertação encontra-se alicerçada na exposição dos fundamentos físicos e matemáticos de uma estratégia baseada em chaveamentos controlados, cujos instantes para o religamento da linha são pré-programados. A avaliação computacional da eficácia da metodologia é realizada utilizando o simulador ATP, no qual são efetuados estudos em um sistema elétrico típico submetido à curtos-circuitos sucedidos por desligamentos e subsequentes religamentos, sob a ação da tecnologia aqui focada e na ausência da mesma.<br>The search for mitigation solutions, with respect to the effects of overvoltages linked to the energization and reclosing maneuvers of transmission lines include a challenging subject with strong impact on the insulation coordination of electrical systems. Although the recognition of classical and commercial proposals to mitigate these phenomena, other possibilities are certainly still worthwhile highlighting and investigations. In this context, the present work is grounded in the exposure of the physical and mathematical foundations of a strategy based on controlled switchings, whose moments to the line reclosing are pre-programmed. The computational evaluation of the effectiveness of the methodology is made using the ATP simulator, which are studies in a typical electrical system subjected to the action of short-circuits fallowed by shutdowns and subsequent reclosing, under the action of technology here focused and lack thereof.<br>Dissertação (Mestrado)
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Felicetti, Roberto. "Voltage Transients in the Field Winding of Salient Pole Wound Synchronous Machines : Implications from fast switching power electronics." Licentiate thesis, Uppsala universitet, Elektricitetslära, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-434652.

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Wound Field Synchronous Generators provide more than 95% of the electricity need worldwide. Their primacy in electricity production is due to ease of voltage regulation, performed by simply adjusting the direct current intensity in their rotor winding. Nevertheless, the rapid progress of power electronics devices enables new possibilities for alternating current add-ins in a more than a century long DC dominated technology. Damping the rotor oscillations with less energy loss than before, reducing the wear of the bearings by actively compensating for the mechanic unbalance of the rotating parts, speeding up the generator with no need for additional means, these are just few of the new applications which imply partial or total alternated current supplying of the rotor winding. This thesis explores what happens in a winding traditionally designed for the direct current supply when an alternated current is injected into it by an inverter. The research focuses on wound field salient pole synchronous machines and investigates the changes in the field winding parameters under AC conditions. Particular attention is dedicated to the potentially harmful voltage surges and voltage gradients triggered by voltage-edges with large slew rate. For this study a wide frequency band simplified electromagnetic model of the field winding has been carried out, experimentally determined and validated. Within the specific application of the fast field current control, the research provides some references for the design of the rotor magnetic circuit and of the field winding. Finally the coordination between the power electronics and the field winding properties is addressed, when the current control is done by means of a long cable or busbars, in order to prevent or reduce the ringing.
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Němec, Ondřej. "Metodika návrhu svodičů přepětí VN pro vzduchem izolované rozváděče." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-220168.

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The purpose of this thesis is to introduce readers with design of a surge arresters in four different categories. In the first part of this thesis is described theory of overvoltage, surge arresters and testing. The second part of this thesis is focused on design of surge arresters to protect from overvoltage due switching capacitive loads. The thesis continued with design of surge arresters in medium voltage network. The next part is design of surge arresters to protect from overvoltage due switching inductive loads. The next point is protective distance of surge arresters in different lighting overvoltages. In the conclusion of this thesis is the appreciation of whole problems about surge arresters.
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Ezzeddine, Kassem, and Robert Oskarsson. "Analys av kondensatorbatteriers tillkopplingsfenomen : Undersökning av de kopplingsfenomen som uppstår vid tillkoppling av kondensatorbatterier och deras påverkan på närliggande komponenter." Thesis, KTH, Data- och elektroteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-208948.

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Många elektriska apparater är i behov av reaktiv effekt för att kunna fungera. Transport av reaktiv effekt tar onödig plats av den tillgängliga kapaciteten i elnätet, därför används kondensatorbatterier nära slutanvändaren för att generera reaktiv effekt. Därmed genereras och förbrukas den reaktiva effekten i en avskild del av nätet. Tillkoppling av kondensatorbatterier ger upphov till transienter som kan skada andra närliggande komponenter. Utifrån det verkliga ställverket Stallbacka i Trollhättan har denna rapport analyserat de transienter som uppstår efter tillkoppling av ett kondensatorbatteri inom mellanspänningsområdet. Analysen har innefattat hur stora transienterna blir efter olika förutsättningar och scenarier. Resultatet visade att transienterna i detta fall aldrig nådde upp till några allvarliga nivåer, och därmed klarade komponenterna sig med god marginal. Huruvida transienterna påverkar elkvaliteten är oklart, då det inte finns några definierade krav. Slutligen skulle ett beräkningsverktyg för förutspådda transienter tas fram. Beräkningsverktyget blev aldrig fullständigt på grund av den ohanterliga lösningen som erhölls.<br>Many electrical devices need reactive power to operate. Transmission of reactive power occupies a proportion of the available capacity in the power system and therefore capacitor banks are used near to the end user to generate reactive power. Thus, the reactive effect is generated and consumed in a separate part of the power system. Capacitor banks switching causes transients which may damage the surrounding components. Based on the real substation Stallbacka in Trollhättan, this study has analysed capacitor banks switching transients within the medium voltage level. The analysis has covered the size of these transients according to different conditions and scenarios. The result showed that the transients in this case never reached serious levels, thus there was no impact on the components. It is not clear whether the transients affect the power quality because there are no defined limits.  A calculation tool to the predicted transients was supposed to be created in the process. This calculation tool was never completed due to the unmanageable solution that was obtained.
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Nguyen, The Cong. "Recherche par voie analytique et par simulation numérique des surtensions engendrées lors de la mise sous tension de lignes de transport d'énergie chargées par un transformateur à vide." Grenoble INPG, 1994. http://www.theses.fr/1994INPG0089.

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Cette thèse traite de l'étude analytique et numérique des surtensions de manoeuvre d'un réseau électrique comportant un transformateur à vide raccordé à l'extrémité d'une ligne de transport. Ce traitement permet d'établir des règles aussi simples que possibles pour identifier et éviter des manoeuvres dangereuses, lorsqu'il s'agit par exemple de remettre sous tension un réseau à l'issue d'un incident. Dans une première partie, une analyse de l'ensemble des surtensions de manoeuvre sur la ligne à vide est rappelée, puis une extension du problème avec transformateur à vide à son extrémité est considérée. Dans une deuxième partie, une configuration monophasés simple mais représentative d'un cas réel a été définie permettant d'effectuer une étude analytique des surtondons aux bornes du transformateur. Les résultats obtenus dans le cas linéaire comme dans le cas non linéaire sont qualitativement représentatifs. Ensuite, une simulation numérique triphasée a été réalisée à l'aide du logiciel Morgat. Pour cela, nous avons développé des sous-programmes de gestion des valeurs d'entrée et des résultats simulés permettant d'enchaîner les simulations en modifiant un ou plusieurs paramètres de manière déterministe ou statistique associée à un générateur aléatoire. Les paramètres ayant une influence importante ont été analysés et seuls trois d'entre eux ont été retenus : la fréquence propre du réseau vue des bornes du transformateur, la puissance de la source et la puissance du transformateur cible. L'une des conclusions auxquelles on aboutit est que le rapport des puissances transformateur cible et source doit être adapté si on désire limiter les surtensions. Enfin, une étude statistique de la fermeture aléatoire des trois pôles du disjoncteur autour d'une valeur moyenne a été faite. Ceci nous a permis de définir un critère simplifié caractérisant le domaine des surtensions admissibles en fonction des paramètres d'influence
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Zare, Firuz. "Multilevel converter structure and control." Thesis, Queensland University of Technology, 2001. https://eprints.qut.edu.au/36142/7/36142_Digitsed%20Thesis.pdf.

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In recent years, multilevel converters are becoming more popular and attractive than traditional converters in high voltage and high power applications. Multilevel converters are particularly suitable for harmonic reduction in high power applications where semiconductor devices are not able to operate at high switching frequencies or in high voltage applications where multilevel converters reduce the need to connect devices in series to achieve high switch voltage ratings. This thesis investigated two aspects of multilevel converters: structure and control. The first part of this thesis focuses on inductance between a DC supply and inverter components in order to minimise loop inductance, which causes overvoltages and stored energy losses during switching. Three dimensional finite element simulations and experimental tests have been carried out for all sections to verify theoretical developments. The major contributions of this section of the thesis are as follows: The use of a large area thin conductor sheet with a rectangular cross section separated by dielectric sheets (planar busbar) instead of circular cross section wires, contributes to a reduction of the stray inductance. A number of approximate equations exist for calculating the inductance of a rectangular conductor but an assumption was made that the current density was uniform throughout the conductors. This assumption is not valid for an inverter with a point injection of current. A mathematical analysis of a planar bus bar has been performed at low and high frequencies and the inductance and the resistance values between the two points of the planar busbar have been determined. A new physical structure for a voltage source inverter with symmetrical planar bus bar structure called Reduced Layer Planar Bus bar, is proposed in this thesis based on the current point injection theory. This new type of planar busbar minimises the variation in stray inductance for different switching states. The reduced layer planar busbar is a new innovation in planar busbars for high power inverters with minimum separation between busbars, optimum stray inductance and improved thermal performances. This type of the planar busbar is suitable for high power inverters, where the voltage source is supported by several capacitors in parallel in order to provide a low ripple DC voltage during operation. A two layer planar busbar with different materials has been analysed theoretically in order to determine the resistance of bus bars during switching. Increasing the resistance of the planar busbar can gain a damping ratio between stray inductance and capacitance and affects the performance of current loop during switching. The aim of this section is to increase the resistance of the planar bus bar at high frequencies (during switching) and without significantly increasing the planar busbar resistance at low frequency (50 Hz) using the skin effect. This contribution shows a novel structure of busbar suitable for high power applications where high resistance is required at switching times. In multilevel converters there are different loop inductances between busbars and power switches associated with different switching states. The aim of this research is to consider all combinations of the switching states for each multilevel converter topology and identify the loop inductance for each switching state. Results show that the physical layout of the busbars is very important for minimisation of the loop inductance at each switch state. Novel symmetrical busbar structures are proposed for multilevel converters with diode-clamp and flying-capacitor topologies which minimise the worst case in stray inductance for different switching states. Overshoot voltages and thermal problems are considered for each topology to optimise the planar busbar structure. In the second part of the thesis, closed loop current techniques have been investigated for single and three phase multilevel converters. The aims of this section are to investigate and propose suitable current controllers such as hysteresis and predictive techniques for multilevel converters with low harmonic distortion and switching losses. This section of the thesis can be classified into three parts as follows: An optimum space vector modulation technique for a three-phase voltage source inverter based on a minimum-loss strategy is proposed. One of the degrees of freedom for optimisation of the space vector modulation is the selection of the zero vectors in the switching sequence. This new method improves switching transitions per cycle for a given level of distortion as the zero vector does not alternate between each sector. The harmonic spectrum and weighted total harmonic distortion for these strategies are compared and results show up to 7% weighted total harmonic distortion improvement over the previous minimum-loss strategy. The concept of SVM technique is a very convenient representation of a set of three-phase voltages or currents used for current control techniques. A new hysteresis current control technique for a single-phase multilevel converter with flying-capacitor topology is developed. This technique is based on magnitude and time errors to optimise the level change of converter output voltage. This method also considers how to improve unbalanced voltages of capacitors using voltage vectors in order to minimise switching losses. Logic controls require handling a large number of switches and a Programmable Logic Device (PLD) is a natural implementation for state transition description. The simulation and experimental results describe and verify the current control technique for the converter. A novel predictive current control technique is proposed for a three-phase multilevel converter, which controls the capacitors' voltage and load current with minimum current ripple and switching losses. The advantage of this contribution is that the technique can be applied to more voltage levels without significantly changing the control circuit. The three-phase five-level inverter with a pure inductive load has been implemented to track three-phase reference currents using analogue circuits and a programmable logic device.
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Book chapters on the topic "Switching overvoltage"

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Wang, Dongju, Hao Zhou, and Jiyuan Li. "Switching Overvoltage of UHVDC System." In Advanced Topics in Science and Technology in China. Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54575-1_16.

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Ji, Rongrong, Hao Zhou, and Xiujuan Chen. "Switching Overvoltage of UHVAC Systems." In Advanced Topics in Science and Technology in China. Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54575-1_6.

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Zhang, Shiyu, Yingqiang Guo, and Dajie Lin. "Analysis of the EMU Switching Overvoltage During Pantograph Raising Base on Multiple Re-strikes Arc Model." In Proceedings of the 6th International Conference on Electrical Engineering and Information Technologies for Rail Transportation (EITRT) 2023. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-99-9319-2_42.

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Nikolaev, A., E. Smirnov, and V. Ochiridnyak. "Development of Improved Electric Arc Model in Vacuum Circuit Breaker for Simulation Switching Overvoltages." In Lecture Notes in Electrical Engineering. Springer Nature Switzerland, 2025. https://doi.org/10.1007/978-3-031-82494-4_21.

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Nikolaev, A., E. Smirnov, and S. Morozov. "Experimental Time Difference Effect Studies of the Vacuum Circuit Breakers in Electric Arc Furnaces on Switching Overvoltages." In Advances in Automation IV. Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-22311-2_41.

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Martin, Patrick, Ludovic Lacheze, Alain Kamdel, and Philippe Descamps. "Characterization of Switching Transistors Under Electrical Overvoltage Stresses." In Embedded Mechatronic Systems. Elsevier, 2019. http://dx.doi.org/10.1016/b978-1-78548-189-5.50005-7.

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Martin, Patrick, Ludovic Lacheze, Alain Kamdel, and Philippe Descamps. "Characterization of Switching Transistors under Electrical Overvoltage Stresses." In Embedded Mechatronic Systems 1. Elsevier, 2015. http://dx.doi.org/10.1016/b978-1-78548-013-3.50005-x.

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"Switching Overvoltages." In High Voltage Circuit Breakers. CRC Press, 2002. http://dx.doi.org/10.1201/9780203910634.ch4.

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"Sheath Overvoltage Due to External Faults in Specially Bonded Cable System." In Advances in Computer and Electrical Engineering. IGI Global, 2016. http://dx.doi.org/10.4018/978-1-4666-6509-5.ch011.

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In chapter 10, It is shown that the types of the bonding are one of the important factors which affect the sheath losses in single-core cables, and it is concluded that both single-point bonding and cross bonding, which are known as special bonding, introduce the lowest losses in the metallic sheath of the cable. To take the advantages of the specially bonded cable systems it is necessary to insulate the cable sheath from earth to avoid corrosion. This is achieved by having an extruded serving of PVC or PE on the cables and housing the joints in compound filled fiberglass boxes to insulate them from the surrounding soil. The use of special bonding gives rise to sheath over-voltages at sheath sectionalizing insulators in cross bonded cable system and insulators in a single-point bonded cable system due to lightning, switching surges or faults. One of the factors affecting the sheath losses in single-core underground power cables in case of special bonding types is the sheath overvoltage. Those over-voltages may cause the sheath multi-points break-down which result in a large sheath currents and losses and hence may cause overheating of the cables and finally leading to operation faults. As mentioned before, faults are one of reasons which cause sheath over-voltages. System faults may be divided into internal faults occurring within the cables themselves and external faults for which the cables carry some or the entire fault current. The sheath voltages resulting from internal faults may greatly exceed those caused by external faults. A fault in the cables themselves inevitably involves repair work and hence it is not so important if the sheath insulation adjacent to the fault is also damaged. The sheath bonding design should preclude the damage cascading to other parts of the cable system i.e. the cable installation must clearly be capable of safely withstanding the effects of any fault in the system external to the cables . So it is important to consider the performance of special sheath bonding methods in relation to power frequency external fault currents.
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Hileman, Andrew R. "Switching Overvoltages, Substations." In Insulation Coordination for Power Systems. CRC Press, 2018. http://dx.doi.org/10.1201/9781420052015-5.

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Conference papers on the topic "Switching overvoltage"

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Arafat, Easir, and Mona Ghassemi. "Switching Overvoltage Analysis in Conventional and Unconventional Transmission Lines." In 2024 IEEE Kansas Power and Energy Conference (KPEC). IEEE, 2024. http://dx.doi.org/10.1109/kpec61529.2024.10676135.

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Wang, Liudan, Siyuan Liu, Yifan Chen, Ziao Yuan, Zhiyuan Liu, and Yingsan Geng. "Investigation on Switching Overvoltage of ±550kV DC GIS in Offshore Wind Farm." In 2024 7th International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST). IEEE, 2024. https://doi.org/10.1109/icepe-st61894.2024.10792454.

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Li, Wanjie, Nan Wang, Denghui Zhai, Weihua Xie, Kun Zhang, and Wenlong Ren. "Simulation Analysis of Switching Overvoltage in 220kV/300MW Flexible Low Frequency Transmission System." In 2025 7th Asia Energy and Electrical Engineering Symposium (AEEES). IEEE, 2025. https://doi.org/10.1109/aeees64634.2025.11019362.

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Sadoughi, Milad, Fariba Fateh, and Behrooz Mirafzal. "Overvoltage Stress on AC Motor Winding Insulations Driven by Fast-Switching Inverters: A Study." In 2024 IEEE Kansas Power and Energy Conference (KPEC). IEEE, 2024. http://dx.doi.org/10.1109/kpec61529.2024.10676263.

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Zhang, Yaonan, Jian Pi, Changgui Zheng, Huawei Feng, and Fan Jiang. "Research on Overvoltage Detection Method of Flyback Switching Power Module Based on Time Relay." In 2024 IEEE 6th International Conference on Power, Intelligent Computing and Systems (ICPICS). IEEE, 2024. https://doi.org/10.1109/icpics62053.2024.10796035.

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Zhan, Huamao, Fengyuan Lu, Genyuan Cao, Hongbin Su, Weijie Wang, and Tong Wu. "Research on Switching Overvoltage Operation and Protection Configuration of Extra High Voltage Pumped Storage Power Station." In 2024 4th International Conference on Energy, Power and Electrical Engineering (EPEE). IEEE, 2024. https://doi.org/10.1109/epee63731.2024.10875465.

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Chen, Shen, Yang Xu, Yang Chen, et al. "Reconstruction of switching overvoltage waveform measuring in a 500kV substation using electro-optical E-field sensor." In 2024 IEEE 8th Conference on Energy Internet and Energy System Integration (EI2). IEEE, 2024. https://doi.org/10.1109/ei264398.2024.10991510.

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Torres, Renato Amorim, Suresh Gopalakrishnan, Chandra Namuduri, and Thomas Luo. "Novel Low-Loss Filter for Overvoltage Mitigation in WBG-based Hard Switching Electric Drives with AC cables." In 2024 IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 2024. https://doi.org/10.1109/ecce55643.2024.10861642.

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Chen, Zhiwei, Zonghao Li, Jilong Qiu, and Jie Wang. "Research on the Suppression of Overvoltage Caused by Switching of Parallel Capacitor Banks Using Resistance Capacitance Protectors." In 2024 4th International Conference on Intelligent Power and Systems (ICIPS). IEEE, 2024. https://doi.org/10.1109/icips64173.2024.10900294.

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Lou, Ying, Binqiang Xia, Guowen Hao, et al. "Study on Closing No-Load Line Switching Overvoltage of Outgoing Lines of 500kV Pumped Storage Power Station." In 2025 7th Asia Energy and Electrical Engineering Symposium (AEEES). IEEE, 2025. https://doi.org/10.1109/aeees64634.2025.11020574.

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