Relevant bibliographies by topics / Medium Voltage Network

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

Academic literature on the topic 'Medium Voltage Network'

Author: Grafiati
Published: 4 June 2021
Last updated: 11 February 2022

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Journal articles on the topic "Medium Voltage Network"

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Zhu, Yanping, Jianbo Gong, and Xin Sun. "The Reliability Improvement Strategy of Medium Voltage Distribution Network Based on Network Frame Optimization." International Journal of Electrical Energy 7, no. 2 (December 2019): 58–61. http://dx.doi.org/10.18178/ijoee.7.2.58-61.

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Su, Shiwei, Yiran You, and Yu Zou. "COMPREHENSIVE METHOD FOR EVALUATION OF MEDIUM- AND LOW-VOLTAGE DISTRIBUTION NETWORK OPERATING STATE." Tekhnichna Elektrodynamika 2020, no. 6 (October 21, 2020): 47–56. http://dx.doi.org/10.15407/techned2020.06.047.

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With the development of intelligent distribution networks and access to distributed energy, the solving the problem of timely and accurate determination of the operating state of the distribution network is an urgent task. Based on an improved analysis of the principle components of the network and statements of a self-organizing neural network, this article proposes the method to evaluate the operating state of medium- and low-voltage distribution networks. At the first step, the system of evaluating indices of the network is formed by advanced component analysis. The evaluation system is grounded on four aspects, including safety, reliability, quality and economy. Next, the self-organizing neural network is used to identify and clean up the data regarding the operating state of the distribution network. At the next step, the indicators are modeled at all levels; the entropy method is applied to calculate the total weight of all indicators. Then the value of each indicator is found and the weak links of the distribution network are determined. At the final stage, the comprehensive assessment of the real operation of the distribution network in Guangxi province is carried out. As shown, the method can effectively reduce the effect of abnormal data and subjectivity factor on the results of evaluating the state of the distribution network. That confirms the feasibility and practicability of the proposed method. References 22, figures 6, tables 6.
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Firis, Fatma Avli. "Determining the optimum medium voltage level by analysis of different voltage levels." World Journal of Environmental Research 10, no. 2 (December 31, 2020): 37–49. http://dx.doi.org/10.18844/wjer.v10i2.5344.

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Electric energy, which is the main input of the growing world economy, depending on the consumption of the rapidly increasing world population and the devices fed with this energy, have become more indispensable in our lives with each passing day. In the consumption of electrical energy, determining the voltage level plays an important role in planning distribution systems that will directly affect consumers. Distribution systems in our country have been established at different levels for technical and financial reasons. Incorrect choices that can be made during the determination of the voltage level in distribution systems may increase energy unit costs and network losses, and may cause insulation and reliability problems. The aim of this study is to determine the optimum voltage level in distribution systems. A pilot region was determined for a local electricity distribution network in our country, and modeling and analysis were carried out at different voltage levels in the region with the help of a numerical analysis program. According to the results achieved, Insulation and reliability problems at low voltages are few and economic in terms of investment costs, but it has been observed that the operating load and cost are high due to high network losses. In high voltages, although the operating burden and cost are relatively low, it has been observed that the investment costs are high and the isolation and reliability problems are high. Keywords: cost; distribution; investment; operating ;Voltage
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Sudha Letha, Shimi, Angela Espin Delgado, Sarah K. Rönnberg, and Math H. J. Bollen. "Evaluation of Medium Voltage Network for Propagation of Supraharmonics Resonance." Energies 14, no. 4 (February 19, 2021): 1093. http://dx.doi.org/10.3390/en14041093.

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Power converters with high switching frequency used to integrate renewable power sources to medium and low voltage networks are sources of emission in the supraharmonic range (2 to 150 kHz). When such converters are connected to a medium voltage (MV) network these supraharmonics propagate through the MV network and can impact network and customer equipment over a wide range. This paper evaluates an existing Swedish MV electrical network and studies the pattern of supraharmonic resonance and the propagation of supraharmonics. The MV network consists of eight feeders including a small wind farm. Simulations reveal that, the bigger the MV network, the more resonant frequencies, but also the lower the amplitude of the resonance peaks in the driving point impedance. It was also identified that for short feeders as length increases, the magnitude of the transfer impedance at supraharmonic frequency decreases. For further increment in feeder length, the magnitude increases or becomes almost constant. For very long feeders, the transfer impedance further starts decreasing. The eight feeders in the network under study are similar but show completely different impedance versus frequency characteristics. Measurements at the MV side of the wind farm show time varying emissions in the supraharmonic range during low power production. The impact of these emissions coupled with system resonance is examined.
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Simiyu, Patrobers, Ai Xin, Kunyu Wang, George Adwek, and Salman Salman. "Multiterminal Medium Voltage DC Distribution Network Hierarchical Control." Electronics 9, no. 3 (March 19, 2020): 506. http://dx.doi.org/10.3390/electronics9030506.

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In this research study, a multiterminal voltage source converter (VSC) medium voltage DC (MVDC) distribution network hierarchical control scheme is proposed for renewable energy (RE) integration in a co-simulation environment of MATLAB and PSCAD/EMTDC. A DC optimal power flow (DC OPF) secondary controller is created in MATLAB. In PSCAD/EMTDC, the main circuit containing the adaptive DC voltage droop with a dead band and virtual synchronous generator (VSG) based primary controller for the VSCs is implemented. The simulation of the MVDC network under the proposed hierarchical control scheme is investigated considering variations in wind and solar photovoltaic (PV) power. The network is also connected to the standard IEEE-39 bus system and the hierarchical scheme tested by assessing the effect of tripping as well as restoration of the REs. The results show that during random variations in active power such as increasing wind and PV power generation, a sudden reduction or tripping of wind and PV power, the primary controller ensures accurate active power sharing amongst the droop-based VSCs as well as regulates DC voltage deviations within the set range of 0.98–1.02 pu with an enhanced dynamic response. The DC OPF secondary control optimizes the system’s losses by 38% regularly giving optimal droop settings to the primary controllers to ensure proper active power balance and DC voltage stability. This study demonstrates that the hierarchical control strategy is effective for RE integration in the MVDC distribution network.
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Inagaki, Junichi, and Yasuhiro Hayashi. "Experimental Analysis on Influences of Harmonic Voltage at High-Voltage Network on Harmonic Current at Medium-Voltage Network." Journal of International Council on Electrical Engineering 2, no. 2 (April 2012): 146–52. http://dx.doi.org/10.5370/jicee.2012.2.2.146.

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El-Sayed Gouda, Osama, and Noura Ahmed Elshesheny. "Simulation of the Lightning Back-Flashover for Medium Voltage Distribution Network." Indonesian Journal of Electrical Engineering and Computer Science 3, no. 2 (August 1, 2016): 264. http://dx.doi.org/10.11591/ijeecs.v3.i2.pp264-272.

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Lightning strikes represent a considerable cause of short interruptions in electrical overhead line networks. The over voltages caused by lightning cannot be avoided but their influence can be limited by appropriate over voltage protection. This paper presents analysis study on some factors affecting the back flashover of Egyptian 66 kV distribution lines using Alternative Transient Program (ATP). The study includes the modeling of 66 kV distribution lines, the effects of magnitude and the front and tail times of lightning wave on the back flashover voltages, the effects of the striking distance, and the using of counterpoise wires on the back flashover on the 66 kV line towers. In this paper the 66 kV lines sag is neglected and the soil ionization by the flow of the stroke current is considered.
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Toader, Dumitru, Stefan Haragus, and Constantin Blaj. "Detection of broken conductor with ground contact faults in medium voltage power networks." Facta universitatis - series: Electronics and Energetics 19, no. 3 (2006): 429–38. http://dx.doi.org/10.2298/fuee0603429t.

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A major problem concerning the operation of medium voltage power networks refers to the neutral-point grounding system. Several technical solutions are in use, none of them being completely satisfactory. One criterion to appreciate the efficiency of a grounding system is the ability of the network?s protective system to accurately detect various types of faults such as broken conductor with ground contact faults. This type of fault make a relatively important figure (3 to 10 %) in the total faults statistics for a medium voltage network. In order to detect such faults, the sensed variables are the zero-sequence voltage and the neutral-grounding current. In this paper an analytical and computational analysis is performed to see how various fault and network parameters affect these variables, assuming different grounding systems. Measurements made in two real medium voltage networks show good agreement with the theoretical results.
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Kacejko, Piotr, and Paweł Pijarski. "Optimal Voltage Control in MV Network with Distributed Generation." Energies 14, no. 2 (January 17, 2021): 469. http://dx.doi.org/10.3390/en14020469.

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The article presents the concept of voltage control in a medium-voltage network, using the classical control of a HV/MV (High Voltage/Medium Voltage) transformer and active participation of distributed generation sources. The proposed solution is based on the results of the optimization process. The objective function is considered as a single-criterion—the voltage quality indicator or value of power losses in the network, and optionally as two-criteria (voltage quality and losses combined, with appropriately selected weight factors). The analysis carried out for random selection of independent variables, using the original heuristic algorithm, indicated a very high efficiency of the proposed control process, compared to the traditional approach. A significant improvement in the voltage quality index and reduction of losses was found, which justifies the advisability of looking for new solutions in the field of voltage control in MV networks, taking into account active participation of distributed generation.
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Silva, Artur de Araujo, Claudio Floridia, and Joao Batista Rosolem. "Study of a Current and Voltage Polarization Sensor Network." Sensors 21, no. 13 (July 1, 2021): 4528. http://dx.doi.org/10.3390/s21134528.

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Sensors based on polarization are suitable for application in power grids due to their excellent characteristics, such as high electrical insulation, non-magnetic saturation, oil-free, no risk of explosive failures, and high bandwidth. Utility companies are incorporating new technologies that are driving the evolution of electrical systems. Thus, it is interesting to evaluate the possibility of using polarization sensors in a network configuration. In this work, we present an experimental study of a current and voltage polarization sensor network applied to a medium voltage distribution grid. The current sensor is based on the Faraday effect, and the voltage sensor uses the Pockels effect. Both sensors use a 90° polarization degree between the two output ports to compensate for the various impairments on the measurements by applying the difference-over-sum. The network uses a DWDM topology centered at the 1550 nm range, and both current and voltage sensors in this work used this spectral band. We evaluated the sensor node in terms of accuracy according to IEC standard 61869-10 and IEC standard 61869-11. Considering that an important application of this sensor network is in the aerial cable of medium voltage networks, sensor node accuracy was also estimated in the presence of cable vibration. The calculated power budget of the proposed network indicates that reaching ten nodes of current and voltage sensors in a 10 km optical link is possible, which is enough for a medium urban voltage distribution network.
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Dissertations / Theses on the topic "Medium Voltage Network"

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Tendolkar, Chaitanya. "An Analysis of Geospatial Factors in Medium Voltage Grid Distribution Network Routing." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-264248.

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To provide electricity access to the population currently deprived of it, is one of the sustainable development goals. Although the number is decreasing and is below 1 billion people without access to electricity for the first time in the year 2017, there is still much to be done. At the current rate of electrification an additional approximately 550 million people of those deprived now would have access to electricity by the year 2030, but 650million would still be without electricity access. This report studies the spatial factors that affect how MV network expansion occurs. The motivation for this report comes from studying previous research work using GIS and studying the Open Source Spatial Electrification Tool (OnSSET) which is developed by the division of Energy Systems Analysis at KTH. The objective of this tool is to aid electrification planning by examining options ranging from national grid expansion to off-grid resources such as solar, wind, hydro based on spatial analysis of data. The study is conducted into two parts. First by undertaking a literature review of relevant GIS based electrification and utility planning articles, to identify the factors that contribute to the costs of grid network extension. Thereafter, existing grid networks in Malawi, Nigeria and Uganda have been analyzed to examine the correlation to the different factors identified in the literature review. A qualitative comparison is conducted between the different countries to aid the development of spatial analysis tools such as OnSSET. The observations made studying the countries in the Sub-Saharan Africa region are noted down in the results section depicting similarities in planning and implementation of the grid network. Finally, necessary suggestions are made that might supplement and help the efforts in geospatial electrification network planning tools like OnSSET. The differences between literature review and practical geospatial analysis tools is also mentioned including the challenges faced during this thesis.
Att kunna förse el till befolkningen som för närvarande ej har tillgång till det är ett av de globala hållbarhetsmålen. Även om andelen av befolkningen som inte har tillgång till el sjunker och befinner sig under 1 miljard för första gången år 2017, behöver mer göras. Vid nuvarande tillväxt av antalet människor som får tillgång till el kommer ytterligare 550 miljoner ha tillgång år 2030, men 650 miljoner kommer fortfarande vara utan. Denna rapport studerar de rumsliga faktorerna som påverkar sättet som utbyggnad av MV-nätverk sker. Motiveringen till denna rapport härrör från tidigare forskning med GIS och undersökningar av Open Source Spatial Electrification Tool (OnSSET) vilket är utvecklat av enheten för Energisystemanalys på KTH. Syftet med detta verktyg är att bistå planering för elektrifiering genom att analysera såväl utbyggnad av det nationella elnätet som fristående alternativ som sol-, vind- och vattenbaserade resurser med hjälp av spatiala dataanalyser. Denna undersökning genomförs i två delar. Den första delen behandlar litterära studier av relevanta GISbaserade studier för elektrifikations och nätverksplanering,, för att identifiera faktorer som bidrar till kostnaden av nätverkets expansion. Den andra delen behandlar existerande nätverk i Malawi, Nigeria och Uganda som har analyserats för att analysera korrelationen mellan de faktorer som identifierats i den litterära undersökningen. En kvalitativ jämförelse genomförs mellan de olika länderna för att bidra till utvecklingen av rumsliga analytiska verktyg som OnSSET. Observationerna som gjorts vid undersökningen i delen av Afrika söder om Sahara är noterade i resultatsektionen som skildrar likheter i planering och implementering av rutnätverken. Slutligen är nödvändiga förslag gjorda som möjligen kan bidra till och hjälpa i arbetet för geospatial elektrifikations planeringsverktyg som OnSSET. Skillnader mellan litterära undersökningen och praktiska geospatiala analysverktyg är också nämnd inklusive utmaningarna inför denna avhandling.
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Abbas, Junaid. "Logical selectivity for medium voltage overcurrent protection and its verification via co-simulation tool for the responses of the power and communication network." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/15274/.

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This thesis deals with the modelling and simulation of MV network overcurrent protection using EMTP. Transmission lines 25 Km in length for both radial and loop network with constant parameters operates at 50 Hz and 66 kV line to line voltages are simulated using EMTP. The first part of the thesis discusses the simulation of Radial network with unearthed neutral for analysing the behaviour of the fault current making the comparison with healthy feeder. Second part is to use a Radial network with compensated neutral, Petersen Coil (PC) is used for compensation of the short circuit current making the similar comparison. Third step is to design a 67N directional replay protection in EMTP to trip the circuit breaker in the fault situation. Then using both Radial and Loop network, a comparison and response of the 67N protection in both situations is analysed. Several simulations of Single Line to Ground Faults (SLGF) with different fault locations were carried out to verify the correct operation of the relay based on the developed protection scheme. The results of the simulation the operation of the relay based on its protection scheme and its response time based on the fault location. Finally, delay between the blocking signals are inserted to see the behaviour of the protection system under loop network configuration.
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Marguet, Raphaël. "Improved fault localization method for electrical power distribution networks." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GRENT015/document.

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Ces travaux proposent des améliorations de méthodes de localisation desdéfauts électriques sur les réseaux électriques de distribution. Les réseaux de transportont rapidement été instrumenté en élément de protection. En effet, un incident survenantsur le réseau de transport peut entrainer de graves conséquences s’il n’est pas traité rapidement.Les réseaux de distribution quand à eux possèdent un schéma de protectionminimal. Cependant le développement des smart grids (ou réseaux intelligents) amène denouvelles possibilités avec l’ajout d’équipements de mesures sur le réseau de distribution.Les travaux présentés dans cette thèse développent deux méthodes de localisation de défaut.La première permet de mieux utiliser l’équipement déjà en place (indicateurs depassage de défaut) afin d’isoler de manière rapide et fiable la zone concernée par le défaut.La deuxième permet une localisation précise (en distance) des différents lieux de défautspossibles à partir de mesures électriques
This thesis proposes to improve fault localization methods for electricalpower distribution networks. Transmission networks were quickly equipped with protectionand fault localization equipments. Indeed, faults on the transmission network need tobe dealt with quickly in order to avoid serious consequences. Unlike transmission networks,distribution networks have a minimal protection scheme. The smart grid developmentsbring new possibilities with the installation of new equipments giving access to many newvariables. The work presented in this thesis develop two fault localization method. Thefirst aims in using the equipment already installed (fault indicators) in order to isolatequickly and efficiently the zone concerned by the fault. The second method performs aprecise localization (in distance) of the different possible fault locations from the electricalmeasurements made on the network
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Hunold, Sven. "Algorithmische Bestimmung der Alterungscharakteristik von Mittelspannungskabelmuffen basierend auf diagnostischen Messwerten und Betriebsmitteldaten." Doctoral thesis, Universitätsbibliothek Chemnitz, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-216676.

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Bei der Zustandsbewertung von Kabeln steht derzeit das Mittelspannungsnetz im Fokus der Betrachtungen. Das Mittelspannungsnetz verbindet das Hochspannungsnetz mit dem Niederspannungsnetz und nimmt damit eine besondere Bedeutung ein. Störungen in diesem Netz wirken sich direkt als Versorgungsunterbrechung auf den Letztverbraucher aus. Rund 80 bis 85 % der Versorgungsunterbrechungen resultieren aus Problemen im Mittelspannungsnetz, sodass dortige Aktivitäten den größten Hebel bei der Steigerung der Versorgungsqualität entwickeln. Mittels Zustandsbewertung von Kabeln können verdeckte Fehler aufgedeckt oder deren Alterungszustand bestimmt werden. Nicht jeder diagnostizierte Fehler führt unmittelbar zum Ausfall. Er beschleunigt jedoch die Alterung, die letztendlich zum Ausfall führt. Die Arbeit beschäftigt sich mit der Identifizierung von Fehlern in Mittelspannungskabelmuffen im Zusammenhang mit der Alterung, um die Restlebensdauer auszunutzen und dem Ausfall zuvorzukommen
By evaluating the status of cables, hidden errors can be detected or their aging condition can be determined. Not every diagnosed fault leads directly to failure. However, it accelerates aging, which ultimately leads to failure. The work deals with the identification of faults in medium-voltage cable joints in connection with aging in order to exploit the remaining life and to prevent the failure
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Andersson, Tommy, and Erik Lindell. "Kartläggning av begränsande faktorer vid fellokalisering med pulsekometod på mellanspänningskablar." Thesis, Högskolan Väst, Avd för data- och elektroteknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-6865.

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I samband med att mellanspänningsnätet kablifieras ökar också kraven vad gäller fellokalisering. För att hålla avbrottstiderna i nätet korta är effektiv felsökning erforderlig. Detta arbete syftar till att kartlägga och redogöra för begränsande faktorer som finns vid fellokalisering med fokus på pulsekometoden. Uppdraget utförs tillsammans med Vattenfall Eldistribution AB. Det har uppdagats problem gällande fellokalisering på mellanspänningskablar med pulsekometoden. Ett flertal faktorer bidrar till denna problematik. Resultatet från studien visar att kabelkonstruktionen är en betydande del i det som begränsar pulsekometodens användningsområden och funktionalitet. Rapporten redogör för grundläggande information kring konstruktion och typer av mellanspänningskablar. Kartläggningen uppvisar hur vattenträd påverkar en kabel negativt. Allmänt redogörs för vad som orsakar vattenträd samt vilka avhjälpande åtgärder som vidtas; trippelextrudering samt mantel- och isolationsprovning. Vidare beskrivs olika feltyper, kabeltyper, kabelgenerationer samt instrument- och metodtyper som alla är påverkande faktorer vid fellokalisering. Dokumentering är i högsta grad väsentligt för en lyckad felsökningsprocedur, vilket klarläggs i rapporten. Utöver dokumentation redogörs för hur kabelns kondition kan påverka felsökningsresultatet. Ett antal mätmetoder och mätinstrument finns till förfogande vid felsökning och provning. Alla har sina egna för- respektive nackdelar. De har även tillhörande användningsområden. Pulsekometerns grundfunktion studeras och förklaras. De övriga mätmetoderna, som används vid fellokalisering och provning, redogörs för endast generellt
As the medium voltage network cables in Sweden is buried down in the earth, the demand of fault localization expertise increases. To keep downtimes in the network short, the importance of effective fault localization is necessary. This work is aimed to map and visualize limiting factors within fault localization with focus on the TDR - Time Domain Reflectometry. This work is a collaboration with Vattenfall Eldistribution AB. Problems with fault localization on medium voltage cables with the TDR have been detected. A multiple factors are contributing to this problem. The results of this study show that the cable construction is a significant part in which extent the TDR can be used. The report are also accounting for basic information about construction and types. The mapping also illustrates water treeing and how it affects cables in a negative way. Visualization of what causes water treeing and several actions such as triple extrusion, jacket testing and insulation testing is included in the essay. Further information about fault types, cable types, cable generations, instrument types and method types is given. All of them are affecting factors within the area of fault localization. Documentation is highly important for a successful fault localization procedure, which is clarified in the report. Besides documentation the cable condition and the influence on it affecting the result of fault localization is stated. A number of measuring methods and instruments are available to use when fault localization and testing are occurring. Every instrument has their own advantages and disadvantages. They also have their own respective area of usage. The basic principle of TDR is studied and explained accordingly. The other measuring methods, which are used in fault localization and testing, are shown more generally
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Khan, Zahir Hoosain. "Improving the reliability performance of medium voltage networks." Master's thesis, University of Cape Town, 2015. http://hdl.handle.net/11427/20047.

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The aim of this dissertation is to investigate alternative, more reliable and cost effective ways of improving the reliability performance of medium voltage networks. Customers are mainly affected by faults on the distribution MV network, to which, consequently, we have to pay particular attention. A major requirement on electricity supply systems is high supply reliability for the customer which is mainly determined by the distribution networks. Power system reliability is an essential factor in the quality of supply and is directly related to the number and duration of outages. By analysing the power system properly, the weaknesses will then be identified and improvements can be introduced to minimise the occurrence of outages. A decrease in the outage rate will result in an improvement in reliability and quality of supply of the distribution MV network. The dissertation focuses on improving the network management by increasing the level of network automation and control which improves the operating efficiency of medium voltage distribution networks. Steps are shown how to equip the network according to progressive investment capability, from Fault Path Indicators (FPIs) and remote control Pulseclosing technologies to automatic FuseSavers and Tripsavers used in a feeder automation scheme to minimise the number of disturbances and the outage durations experienced when they occur. The results of a study analysing the impact of different intelligent automation solutions on the reliability performance of Medium Voltage distribution networks are presented in the dissertation. The respective system topologies are modelled and the resulting system reliability performance is determined by reliability calculations such as the SAIDI and SAIFI values. The results show that the distribution automation technologies can have a very significant impact on both the SAIDI and SAIFI performance of the systems. Further, selected details related to the implementation of such intelligent automation schemes are presented in this dissertation.
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Oliveira, Karina Lino Miranda de. "Otimização da rede coletora de média tensão de parques eólicos utilizando um algoritmo genético modificado." Universidade Federal de Juiz de Fora, 2016. https://repositorio.ufjf.br/jspui/handle/ufjf/1337.

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Dentre as diversas fontes de energia renovável, a energia eólica se destaca como uma das mais promissoras. Em meio ao cenário de crise energética em muitos países, crescimento da demanda, maior conscientização ambiental e maior exigência por uma energia de qualidade por parte das sociedades modernas, a energia eólica tem ganhado importância econômica e estratégica. No Brasil, os empreendimentos eólicos são contratados por meio de leilões através dos quais são declarados vencedores aqueles empreendimentos que ofertam o menor preço pela energia gerada. Este modelo vigente é responsável por acirrar a concorrência e, consequentemente, instigar a busca pela otimização das propostas. Considerando este aspecto, é de grande interesse o desenvolvimento de ferramentas computacionais que auxiliem profissionais a desenvolver projetos viáveis técnica e economicamente na fase de planejamento, e de preferência otimizados. Parques eólicos são compostos basicamente por aerogeradores, transformadores responsáveis por elevarem a tensão de saída das turbinas para níveis adequados de distribuição, cabos de média tensão e subestações. A construção da rede coletora de média tensão (rede interna), responsável pela interconexão de todos os aerogeradores e subestações, constitui parcela considerável dos custos globais, o que tem motivado diversos pesquisadores a publicar trabalhos que objetivam encontrar a melhor topologia da rede elétrica que, ao mesmo tempo, minimize os custos e respeite os critérios técnicos estabelecidos, tais como: radialidade, conectividade, variação da tensão nos barramentos, máxima condução de corrente pelo condutor (sobrecarga nos ramos), entre outras. Tendo em vista tais considerações, é proposto nesse trabalho um novo algoritmo de solução para otimização da rede coletora de média tensão de parques eólicos, englobando a determinação da topologia de conexão entre os aerogeradores e subestações e o dimensionamento dos condutores, baseado na utilização de um algoritmo genético modificado como método de otimização. Objetiva-se com esse método minimizar os custos com a aquisição de alguns equipamentos e com as perdas de energia ao longo de um horizonte de planejamento. O método proposto foi testado em parques eólicos fictícios e os resultados obtidos comprovam que o modelo elaborado pode ser utilizado para projetar uma arquitetura otimizada da rede de distribuição interna de parques eólicos.
Among the various sources of renewable energy, wind energy stands out as one of the most promising. Amid the energy crisis scenario in many countries, the demand growth, greater environmental awareness and greater demand for energy quality on the part of modern societies, wind energy has gained economic and strategic importance. In Brazil, wind projects are contracted by means of auctions through which are declared winners those projects that offer the lowest price for energy generated. This current model is responsible for increase competition and consequently instigate the search for optimization of the proposals. Considering this aspect, it is of great interest the development of computational tools to assist professionals to develop technical and economically viable projects in the planning stage, and preferably optimized. Wind farms are basically composed of wind turbines, transformers responsible for raise the output voltage of the turbines for adequate levels of distribution, medium voltage cables and substations. The construction of the medium voltage collector network (internal network), responsible for the interconnection of all wind turbines and substations, constitutes a considerable share of the overall costs, which has motivated many researchers to publish works that aim to find the best grid topology of the electrical network that, at the same time, minimizes costs and respects the technical criteria established, such as: radial configuration, connectivity, voltage variation in bus, current conduction maximum through the cable (overhead in the branches), among others. In view of these considerations, it is proposed in this paper a new solution algorithm to optimization of the medium voltage collector network of wind farms, comprising the determination of topology of connection between the turbines and substations and the sizing of conductors, based on the use of a modified genetic algorithm as optimization method. The objective of this methodology is to minimize the costs of acquisition of some equipment and energy losses over a planning horizon. The proposed method was tested on fictitious wind farms and the results show that the model developed can be used to design the optimized architecture of internal distribution network of wind farms.
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Hunold, Sven. "Algorithmische Bestimmung der Alterungscharakteristik von Mittelspannungskabelmuffen basierend auf diagnostischen Messwerten und Betriebsmitteldaten." Doctoral thesis, Universitätsverlag der Technischen Universität Chemnitz, 2016. https://monarch.qucosa.de/id/qucosa%3A20706.

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Bei der Zustandsbewertung von Kabeln steht derzeit das Mittelspannungsnetz im Fokus der Betrachtungen. Das Mittelspannungsnetz verbindet das Hochspannungsnetz mit dem Niederspannungsnetz und nimmt damit eine besondere Bedeutung ein. Störungen in diesem Netz wirken sich direkt als Versorgungsunterbrechung auf den Letztverbraucher aus. Rund 80 bis 85 % der Versorgungsunterbrechungen resultieren aus Problemen im Mittelspannungsnetz, sodass dortige Aktivitäten den größten Hebel bei der Steigerung der Versorgungsqualität entwickeln. Mittels Zustandsbewertung von Kabeln können verdeckte Fehler aufgedeckt oder deren Alterungszustand bestimmt werden. Nicht jeder diagnostizierte Fehler führt unmittelbar zum Ausfall. Er beschleunigt jedoch die Alterung, die letztendlich zum Ausfall führt. Die Arbeit beschäftigt sich mit der Identifizierung von Fehlern in Mittelspannungskabelmuffen im Zusammenhang mit der Alterung, um die Restlebensdauer auszunutzen und dem Ausfall zuvorzukommen.
By evaluating the status of cables, hidden errors can be detected or their aging condition can be determined. Not every diagnosed fault leads directly to failure. However, it accelerates aging, which ultimately leads to failure. The work deals with the identification of faults in medium-voltage cable joints in connection with aging in order to exploit the remaining life and to prevent the failure.
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Dvořáček, Jiří. "Autonomní a dispečerské řízení distribuovaných zdrojů v distribuční síti VN." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-442469.

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Theses focuses on the evaluation of the possible means of active and reactive power control of generating units connected to medium voltage. First part summarizes analysis of Czech Republic medium voltage distribution grid. It summarizes means of autonomous and dispatcher control of generating units with respect to European Comission directive RfG, standard ČSN EN 50549-2 and national implementation PPDS. Following parts provide description of generating unit and distribution grid models used for simulation in PSCAD. Last part focuses on evaluation of results obtained via simulating steady-state scenarios as well as continuous simulation.
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Marvik, Jorun I. "Fault Localization in Medium Voltage Distribution Networks with Distributed Generation." Doctoral thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elkraftteknikk, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-15549.

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Being part of a larger research project named “Distribution 2020”, the focus of this work has been on increasing the automation of the fault handling in distribution networks, taking into consideration the increasing number of distributed generation (DG) units. The main goal of this work has been to investigate, and further develop methods for locating short circuit faults in distribution networks, with possible presence of DG-units. Also, the developed methods should be simple, and the use of measurements communicated from other locations than the substation should be kept at a minimum. Finally, the fault localization methods should be applicable for a general network. The development of such general methods is meant to be a step towards a more automated fault handling in distribution networks, leading to increased network reliability and reduced outage costs. Fault data have been generated through simulations in the transient electromagnetic program PSCAD, where a simple model of a medium voltage (MV) distribution network was developed. Short circuit data from a real network was not available for this work. A distribution network may have various appearances, as the total length, number of branches, loading, short circuit capacity and other parameters may vary greatly, and generalizing the characteristics for a typical distribution network is not possible. The model parameters are chosen based on real network data, but the model is typically simplified compared to a real network. This work has focused on short circuit faults. Fault simulations have been performed for a feeder without DG, with one DG- and with three DG-units. The impacts of various parameters on the distance estimate obtained by use of conventional distance relays have been investigated. Focus in the investigation was to find which parameters that impact most on the accuracy, and on quantifying the errors in the estimates. It is shown how load and DG introduce substantial errors in the distance estimates from traditional distance relays, and that there is a need for methods to compensate for these impacts in order to obtain a fault localization of sufficient accuracy. Two methods for compensation of the impact from the load and DG-unit(s) on the distance estimates are presented. Both methods make use of pre-fault measurements from the DG-unit together with pre-fault substation measurements, and make rough estimations of the pre-fault load distribution on the feeder. In method 1 the required DG-quantities during fault are estimated, while in method 2 the DG voltage- and current- magnitude and the power factor angle are available from measurements. Requiring only magnitude values from the DG allows for simple communication solutions. In both method 1 and 2 a simple lumped feeder model is utilized for analytical estimation of unknown quantities. This includes estimation of the DG voltage phasor angle referred to the substation voltage. The estimated DG currents during fault in method 1 are quite accurate, especially for twophase short circuits, as seen in Ch. 6.2.5. For three-phase short circuits the estimated currents are generally a bit higher than the simulated. This results in overcompensation of the impact due to the DG in the distance-to-fault estimation. Despite of the overcompensation, the accuracy is improved with compensation 1 in most cases. The improvement is however dependent on the DG location. With a three-phase short circuit at the end of a 30 km long feeder, the largest improvement is seen when the DG is located close to (5 km) the substation, with a reduction of the error from +7.8 km to -1 km. The lowest accuracy of the compensated estimate is obtained when the DG is located at the middle of the feeder. The error is then -1.9 km, which still is an improvement compared to worst case without compensation. The estimates obtained at high load are only slightly more accurate than for low load, despite of the larger difference without compensation. If the DG location is fixed and the fault location is varied, the accuracy of the compensated estimate is decreasing as the fault is moved away from the substation, and the lowest accuracy is obtained when the fault is at the feeder-end. Generally, compensation method 1 results in larger improvement of the accuracy for twophase short circuits, than for three-phase. In method 2, measurements of the DG current- and voltage- magnitudes and the power factor angle during fault are utilized, and very accurate distance estimates are obtained for all cases (largest error with compensation 2 for the shown cases is 0.7 km). The DG-voltage phasor angle relative to the substation voltage is estimated from the lumped feeder model, like in the pre-fault state. The distance estimates are very accurate for all fault cases, so to have measurements from the DG during fault is very advantageous. If the DG voltage magnitude is available during fault it can be utilized for finding the correct faulted branch if there is more than one candidate location. A method where the corresponding DG voltage is estimated for each possible fault location has been suggested. For the example feeder the smallest difference between the estimated and simulated voltage magnitudes corresponded to the correct fault location in all cases. Measurements from the DG-unit during fault result in both more accurate distance estimates and can be used to decide the correct faulted branch, and to have such measurements is therefore very beneficial.
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Books on the topic "Medium Voltage Network"

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Islam, Md Rabiul, Youguang Guo, and Jianguo Zhu. Power Converters for Medium Voltage Networks. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-662-44529-7.

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Islam, Md Rabiul, Youguang Guo, and Jianguo Zhu. Power Converters for Medium Voltage Networks. Springer, 2014.

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Book chapters on the topic "Medium Voltage Network"

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Hubana, Tarik, Elma Begić, and Mirza Šarić. "Voltage Sag Propagation Caused by Faults in Medium Voltage Distribution Network." In Lecture Notes in Networks and Systems, 409–19. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-71321-2_37.

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Meng, Lingmin, Dawei Song, Jie Chen, Fuqiang Mu, and Zhigang Liu. "Research on Reactive Power Optimization Scheme of Metro Medium Voltage Power Supply Network Based on the Medium Voltage Energy Feeding Device." In Lecture Notes in Electrical Engineering, 285–94. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-2862-0_27.

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Luong, Hoang N., Marinus O. W. Grond, Peter A. N. Bosman, and Han La Poutré. "Medium-Voltage Distribution Network Expansion Planning with Gene-pool Optimal Mixing Evolutionary Algorithms." In Lecture Notes in Computer Science, 93–105. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-11683-9_8.

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Liu, Xingdong, Daolin Xu, Hui Peng, Xiaochuan Xu, and Huideng Liu. "Research on Medium Voltage Distribution Network Planning Method Based on Improved Genetic Algorithm." In 2020 International Conference on Data Processing Techniques and Applications for Cyber-Physical Systems, 1479–84. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-1726-3_192.

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Šarić, Mirza, Tarik Hubana, and Elma Begić. "Fuzzy Logic Based Approach for Faults Identification and Classification in Medium Voltage Isolated Distribution Network." In Lecture Notes in Networks and Systems, 44–54. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-71321-2_4.

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Wan Salman, Wan Syaza Ainaa, Mohd Rafi Adzman, Muzamir Isa, N. S. B. Jamili, M. H. Idris, and M. Amirruddin. "Effect of Distributed Generation to the Faults in Medium Voltage Network Using ATP-EMTP Simulation." In Lecture Notes in Electrical Engineering, 1067–82. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-5281-6_76.

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Jamili, N. S. B., Mohd Rafi Adzman, Wan Syaza Ainaa Wan Salman, M. H. Idris, and M. Amirruddin. "Fault Localization and Detection in Medium Voltage Distribution Network Using Adaptive Neuro-Fuzzy Inference System (ANFIS)." In Lecture Notes in Electrical Engineering, 1039–52. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-5281-6_74.

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Lin, Guosong, Sascha Eichstädt, Dirk Turschner, and Hans-Peter Beck. "A New Approach to the Analysis of Network Observability in Medium and Low Voltage Electrical Grids." In Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 122–31. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-61813-5_12.

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Stifter, Matthias, Stefan Übermasser, and Sawsan Henein. "Agent-Based Impact Analysis of Electric Vehicles on a Rural Medium Voltage Distribution Network Using Traffic Survey Data." In Communications in Computer and Information Science, 405–16. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-38061-7_38.

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Mašić, Fatima, Belmin Memišević, Adnan Bosović, Ajla Merzić, and Mustafa Musić. "Implementation of Microgrid on Location Rostovo with Installation of Sustainable Hybrid Power System (Case Study of a Real Medium-Voltage Network)." In Advanced Technologies, Systems, and Applications III, 224–42. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-02574-8_18.

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Conference papers on the topic "Medium Voltage Network"

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Haitao Liu, Jian Song, Bingzhen Zhao, and Xiao Li. "Channel Study for Medium-Voltage Power Network." In 2006 IEEE International Symposium on Power Line Communications and Its Applications. IEEE, 2006. http://dx.doi.org/10.1109/isplc.2006.247469.

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Chung, Y. h., H. j. Kim, G. h. Kwon, T. b. Park, S. h. Kim, K. s. Kim, and J. i. Moon. "Medium Voltage Dynamic Voltage Restorer with Neural Network Controlled Voltage Disturbance Detector." In 2006 International Conference on Power System Technology. IEEE, 2006. http://dx.doi.org/10.1109/icpst.2006.321897.

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Kovac, Miroslav, Peter Bracinik, Marek Hoger, and Marek Roch. "Autonomous power restoration of medium voltage distribution network." In 2012 ELEKTRO. IEEE, 2012. http://dx.doi.org/10.1109/elektro.2012.6225640.

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Fleckenstein, M., M. Eisenreich, and G. Balzer. "Energy storage system in the medium-voltage network." In 2013 12th International Conference on Environment and Electrical Engineering (EEEIC). IEEE, 2013. http://dx.doi.org/10.1109/eeeic.2013.6549622.

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Survilo, Josifs. "Factors affecting the value of network medium voltage." In 2015 56th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON). IEEE, 2015. http://dx.doi.org/10.1109/rtucon.2015.7343112.

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Booth, C., J. R. McDonald, and P. Verster. "Dynamic network reconfiguration for medium voltage system automation." In 1999 IEEE Transmission and Distribution Conference (Cat. No. 99CH36333). IEEE, 1999. http://dx.doi.org/10.1109/tdc.1999.756143.

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Popovic, D., L. Glamocic, M. Nimrihter, M. Tanaskovic, D. Vukotic, and D. Damljanovic. "Optimal automation level of medium voltage distribution network." In 18th International Conference and Exhibition on Electricity Distribution (CIRED 2005). IEE, 2005. http://dx.doi.org/10.1049/cp:20051136.

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Chollot, Y., J. m. Biasse, and A. Malot. "Feeder automation improves medium voltage network operating efficiency." In CIRED Seminar 2008: SmartGrids for Distribution. IEE, 2008. http://dx.doi.org/10.1049/ic:20080450.

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Lichtinghagen, J., M. Sieberichs, A. Moser, and A. Kubler. "Medium voltage network planning considering the current network and geographical restrictions." In 2017 6th International Conference on Clean Electrical Power (ICCEP). IEEE, 2017. http://dx.doi.org/10.1109/iccep.2017.8004765.

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Hong Liu, Shaoyun Ge, and Xuemei Jiang. "Research on voltage level configuration in medium voltage network of new area." In 2008 Third International Conference on Electric Utility Deregulation and Restructuring and Power Technologies. IEEE, 2008. http://dx.doi.org/10.1109/drpt.2008.4523617.

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