Gotowe bibliografie tematyczne / SHORT CIRCUIT LEVELS

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Gotowa bibliografia na temat „SHORT CIRCUIT LEVELS”

Autor: Grafiati
Data publikacji: 11 września 2023

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Artykuły w czasopismach na temat "SHORT CIRCUIT LEVELS"

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ALI, Assist Prof Dr Inaam I., i Mohanad Sh Tarad AL-AASAM. "REDUCING SHORT CIRCUIT LEVELS BY USING SYSTEM SPLITTING STRATEGIES". Al-Qadisiyah Journal for Engineering Sciences 11, nr 3 (31.01.2019): 309–31. http://dx.doi.org/10.30772/qjes.v11i3.563.

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Preliminary studies on Iraqi power system show a significant increase in the short circuit level at some of the grid substations and some power stations. This increasing results from the growth of the power generation and transmission systems in size and complexity. Islanding or splitting is dividing the power system into several islands inorder to reduce short circuit levels and avoiding blackouts. The main islanding problem is determining the location of proper splitting points and load balance and satisfaction of transmission capacity constraints for each islands.This paper mainly introduces new proposed splitting strategies of large-scale power systems by using (PSS™E version 30.3 PACKAGE PROGRAME), such that, make re-interconnection of 400KV super high voltage substation based on three-phase load flow to be minimum flow at splitting point and infeed fault current details method to control short circuit levels in Iraq power system without islanding the power system into isolated islands. Controlled islanding or splitting scheme is frequently considered as the final solution to avoid blackouts of power system.Simulation IEEE-25 bus and Iraqi power system used as the test systems for this method. Furthermore, simulation results show significant effectiveness on reducing short circuit levels with same time give stable splitting islands with same frequency for preventing the system blackouts.
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V., DAVYDENKO, i DAVYDENKO L. "ANALYSIS OF ELECTROMAGNETIC TRANSITIONAL PROCESSES IN THE DISTRIBUTION NETWORK OF 10 KV INDUSTRIAL ENTERPRISE." Journal of Electrical and power engineering 27, nr 2 (28.11.2022): 10–14. http://dx.doi.org/10.31474/2074-2630-2022-2-10-14.

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The article is devoted to the issue of short-circuit analysis in the high-voltage network of the power supply system of an industrial enterprise. A short-circuit analysis is based on the methodology recommended by the IEC 60909 International Standard. The method of equivalent voltage source at a shortcircuit point was used to calculate a short-circuit current. The necessity to analyze short-circuit currents at all levels of the power supply system was used as justification of the feasibility of automation of the calculation process. Module "Shortcircuit analysis" of the ETAP software was used as an analysis tool. The nominal parameters of the elements of the power supply system of the industrial enterprise and its topological structure are the initial data for the calculation. A single-line scheme of a 10 kV distribution network of power supply system is designed in ETAP program for implementation of the calculation process. The calculation of the value of the initial and maximum current for symmetric (three-phase) and asymmetrical ("phase-phase" and "phase-land") short circuits at the specified points of the electrical network, as well as the detection of inconsistency of characteristics installed equipment to short-circuit currents and displaying inadequate places are the result of the module "Short-circuit analysis" of the ETAP program. The results of the analysis of short circuit in the investigated distribution network of the 10 kV industrial enterprise did not find inconsistencies of the equipment characteristics of the requirements for the stability of short-circuit currents.
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Abbas, Zainab Nadhim, i Firas Mohammed Tuaimah. "Stability Improvement of The Iraqi Super Grid (400kV) using High Voltage Direct Current (HVDC) Transmission". Journal of Engineering 27, nr 11 (1.11.2021): 64–74. http://dx.doi.org/10.31026/j.eng.2021.11.05.

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This research analyzes the level of the short circuit effect of the Iraqi super network and decides the suitable location for the High Voltage Direct Current (HVDC) connections in order to obtain the best short circuit reduction of the total currents of the buses in the network. The proposed method depends on choosing the transmission lines for Alternating current (AC) system that suffers from high Short Circuit Levels (SCLs) in order to reduce its impact on the transmission system and on the lines adjacent to it and this after replacing the alternating current (AC) line by direct current (DC) line. In this paper, Power System Simulator for Engineering (PSS/E) is used to model two types of HVDC lines in an effective region of Iraqi networks and to perform comparative studies to test the location of Short Circuit Levels (SCLs) between an actual AC and AC/DC case study in a portion of the Iraqi national network. The results proved the effectiveness of this method in eliminating severe faults and unwanted short currents, and the results showed that the bipolar type is better in reducing Short Circuit Levels of the Iraqi network.
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Tomczyk, Marcin, Ryszard Mielnik, Anna Plichta, Iwona Gołdasz i Maciej Sułowicz. "Application of Genetic Algorithm for Inter-Turn Short Circuit Detection in Stator Winding of Induction Motor". Energies 14, nr 24 (17.12.2021): 8523. http://dx.doi.org/10.3390/en14248523.

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This paper presents a new method of inter-turn short-circuit detection in cage induction motors. The method is based on experimental data recorded during load changes. Measured signals were analyzed using a genetic algorithm. This algorithm was next used in the diagnostics procedure. The correctness of fault detection was verified during experimental tests for various configurations of inter-turn short-circuits. The tests were run for several relevant diagnostic signals that contain symptoms of faults in an examined cage induction motor. The proposed algorithm of inter-turn short-circuit detection for various levels of winding damage and for various loads of the examined motor allows one to state the usefulness of this diagnostic method in normal industry conditions of motor exploitation.
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Idoniboyeobu, D. C., S. L. Braide i Wigwe Elsie Chioma. "Fault Assessment and Mitigation of the 132kV Transmission Line in Nigeria using Improved Resonant Fault Current Limiting (RFCL) Protection Scheme". European Journal of Engineering Research and Science 3, nr 10 (17.10.2018): 38–44. http://dx.doi.org/10.24018/ejers.2018.3.10.796.

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This research work proposed an improved Resonant Fault Current Limiting (RFCL) protection scheme to reduce the impact of three-phase short-circuit faults in a power system sub-transmission network. The model used an interpolator-extrapolator technique based on a Resonant Fault Current Limiter (RFCL) for automating the procedure of predicting the required reactor value that must be in resonant circuit to limit the short-circuit current values to permissible values. Using the developed model, short-circuit fault simulations on the three phases of the transmission line (Phase A-C) were performed in the MATLAB-SIMULINK environment. Simulation results were obtained by varying the resonant inductance (reactor) parameter of the RFCL circuit for each of the phases to obtain permissible short-circuit current levels and the values used to program a functional interpolator-extrapolator in MATLAB; the resonant values were typically set to values of inductance equal to 0.001H, 0.01H and from 0.1H to 0.5H in steps of 0.1H. Simulation results revealed the presence of very high short-circuit current levels at low values of the resonant inductor. From the results of simulations, there are indications that the RFCL approach is indeed very vital in the reduction of the short circuit current values during the fault and can safeguard the circuit breaker mechanism in the examined power system sub-transmission system. In addition, lower fault clearing times can be obtained at higher values of inductances; however, the clearance times start to converge at inductance values of 0.1H and above.
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Idoniboyeobu, D. C., S. L. Braide i Wigwe Elsie Chioma. "Fault Assessment and Mitigation of the 132kV Transmission Line in Nigeria using Improved Resonant Fault Current Limiting (RFCL) Protection Scheme". European Journal of Engineering and Technology Research 3, nr 10 (17.10.2018): 38–44. http://dx.doi.org/10.24018/ejeng.2018.3.10.796.

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This research work proposed an improved Resonant Fault Current Limiting (RFCL) protection scheme to reduce the impact of three-phase short-circuit faults in a power system sub-transmission network. The model used an interpolator-extrapolator technique based on a Resonant Fault Current Limiter (RFCL) for automating the procedure of predicting the required reactor value that must be in resonant circuit to limit the short-circuit current values to permissible values. Using the developed model, short-circuit fault simulations on the three phases of the transmission line (Phase A-C) were performed in the MATLAB-SIMULINK environment. Simulation results were obtained by varying the resonant inductance (reactor) parameter of the RFCL circuit for each of the phases to obtain permissible short-circuit current levels and the values used to program a functional interpolator-extrapolator in MATLAB; the resonant values were typically set to values of inductance equal to 0.001H, 0.01H and from 0.1H to 0.5H in steps of 0.1H. Simulation results revealed the presence of very high short-circuit current levels at low values of the resonant inductor. From the results of simulations, there are indications that the RFCL approach is indeed very vital in the reduction of the short circuit current values during the fault and can safeguard the circuit breaker mechanism in the examined power system sub-transmission system. In addition, lower fault clearing times can be obtained at higher values of inductances; however, the clearance times start to converge at inductance values of 0.1H and above.
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Pantielieieva, Iryna, i Alyona Glushko. "Ways to limit the levels of short circuit currents in electrical grids". Bulletin of the National Technical University «KhPI» Series: New solutions in modern technologies, nr 4(6) (31.12.2020): 54–59. http://dx.doi.org/10.20998/2413-4295.2020.04.08.

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Romaniuk, F. A., E. V. Buloichyk i M. A. Shevaldin. "Determination of the Fault Zone by the Level of Short-Circuit Currents". ENERGETIKA. Proceedings of CIS higher education institutions and power engineering associations 61, nr 5 (4.10.2018): 396–407. http://dx.doi.org/10.21122/1029-7448-2018-61-5-396-407.

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The methods of determination the fault zone according to the parameters of the emergency mode, which can be used to improve the performance of technical perfection of current protection lines of distributive 6–10 kV one-way power networks, are considered. The advantage of the algorithm of determination the zones of short circuit (SC) according to the level of emergency currents as compared to the remote unilateral method addressing the parameters of the damaged loop corrupted loops (loops) is noted. Calculation of the estimated distance to the point of SC on the basis of difference of damaged phase currents has been proposed, that enables the independence of the obtained result on the type of the fault. A technique for increasing the reliability of the method for determination the short-circuit zone by the level of emergency currents based on information about the type of damage has also been proposed. The effect of load currents and contact resistances of different levels on the magnitude and nature of the changes in the errors of the calculated distance to the short circuit was investigated by the method of computational experiment. The levels of contact resistances relative to the total resistance of the line depending on the place of SC occurrence are determined that provides reliable determination of the fault zone; it is demonstrated that the nature of their alteration is approximately the same for lines of medium and long length. The expediency of correction of the calculated distance to the fault location in many cases of short circuits through the contact resistance so to improve the protection capacity of the high-speed current protection stage is demonstrated. Based on the results of the computational experiment, correction factors for the correction of the value of the emergency current have been obtained; on the basis of the latter the fault zone is determined. The estimation of efficiency of the proposed method of correction has been carried out; it is shown that its application makes it possible to improve the accuracy of determination the fault zone and to expand the zone of instantaneous shutdown of short circuit. The dynamic properties of the proposed algorithm for different modes of the line operation have been investigated; it is ascertained that, in the worst case, the determination of the short circuit zone for a time not exceeding 27 ms is provided.
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Berry, Jonathan, Ali Kazerooni i Michael Eves. "Impact of low-carbon technologies on short-circuit levels in medium voltage networks". CIRED - Open Access Proceedings Journal 2017, nr 1 (1.10.2017): 2334–37. http://dx.doi.org/10.1049/oap-cired.2017.0738.

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Antipov, K. M., A. A. Vostrosablin, V. V. Zhukov, E. P. Kudryavtsev, I. P. Kryuchkov, Yu P. Kuznetsov, K. V. Mozgalev i in. "The Problem of Coordination of Levels of Short-Circuit Currents in Power Systems". Power Technology and Engineering 39, nr 3 (maj 2005): 166–78. http://dx.doi.org/10.1007/s10749-005-0304-6.

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Rozprawy doktorskie na temat "SHORT CIRCUIT LEVELS"

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Peres, Wesley. "Contribuições ao estudo de recomposição fluente de sistemas elétricos de potência". Universidade Federal de Juiz de Fora, 2012. https://repositorio.ufjf.br/jspui/handle/ufjf/1784.

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Este trabalho apresenta uma metodologia baseada em Fluxo de Potência Ótimo (FPO) e Análise de Sensibilidade para a definição da configuração mínima de rede necessária para garantir, com segurança, o processo de recomposição fluente de corredores radiais de transmissão. Nos instantes iniciais de recomposição, devido à baixa capacidade de geração que o sistema se encontra, uma estratégia importante consiste em elevar a Capacidade de Curto Circuito das barras. Neste sentido, a metodologia proposta baseia-se na incorporação, na função objetivo do FPO, da maximização da potência de curto circuito das barras. Para tanto, uma Análise de Sensibilidade é realizada a cada iteração do processo iterativo para determinar os fatores de ponderação de alocação associados à impedância equivalente permitindo a inclusão no FPO da maximização da potência de curto circuito das barras. Na metodologia proposta os reatores que mais reduzirem a impedância receberão menores fatores de ponderação de alocação. Adicionalmente, o FPO contempla a modelagem das máquinas síncronas, curva de capabilidade e o estudo de cada cenário de recomposição em regime permanente, pré e pós rejeição de carga. O programa desenvolvido em MATLAB é utilizado para a simulação de corredores de recomposição fluente do sistema elétrico brasileiro. Os resultados obtidos apontam para uma ferramenta eficaz ao estudo de recomposição fluente.
This work presents a methodology based on Optimal Power Flow (OPF) and Sensitivity Analysis to define a minimum network configuration for a power system fluent restoration taking security issues into account. At this early restoration stage, the system has low Short-Circuit Capacity due to the low generation capacity. An important strategy is to increase the Short Circuit Capacity at this operation stage through search network configurations with low bus equivalent impedance. In this work, the Short-Circuit Capacity is incorporated in the objective function of the OPF formulation by using sensitivity analysis which yields lowest allocation factors for more suitable reactors to reduce the equivalents impedances. The proposed OPF takes into account the synchronous machine model, the capability curves and the set of overvoltage critical restoration scenarios following load rejection. The restoration scenarios are represented at steady state prior and after load rejection. The computational tool is developed in the MATLAB platform and it is used to conduct case studies for fluent restoration branches of Brazilian Electric System. The results show that the proposed methodology is effective.
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Pasca, Bogdan Mihai. "Calcul flottant haute performance sur circuits reconfigurables". Phd thesis, Ecole normale supérieure de lyon - ENS LYON, 2011. http://tel.archives-ouvertes.fr/tel-00654121.

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De plus en plus de constructeurs proposent des accélérateurs de calculs à base de circuits reconfigurables FPGA, cette technologie présentant bien plus de souplesse que le microprocesseur. Valoriser cette flexibilité dans le domaine de l'accélération de calcul flottant en utilisant les langages de description de circuits classiques (VHDL ou Verilog) reste toutefois très difficile, voire impossible parfois. Cette thèse a contribué au développement du logiciel FloPoCo, qui offre aux utilisateurs familiers avec VHDL un cadre C++ de description d'opérateurs arithmétiques génériques adapté au calcul reconfigurable. Ce cadre distingue explicitement la fonctionnalité combinatoire d'un opérateur, et la problématique de son pipeline pour une précision, une fréquence et un FPGA cible donnés. Afin de pouvoir utiliser FloPoCo pour concevoir des opérateurs haute performance en virgule flottante, il a fallu d'abord concevoir des blocs de bases optimisés. Nous avons d'abord développé des additionneurs pipelinés autour des lignes de propagation de retenue rapides, puis, à l'aide de techniques de pavages, nous avons conçu de gros multiplieurs, possiblement tronqués, utilisant des petits multiplieurs. L'évaluation de fonctions élémentaires en flottant implique souvent l'évaluation en virgule fixe d'une fonction. Nous présentons un opérateur générique de FloPoCo qui prend en entrée l'expression de la fonction à évaluer, avec ses précisions d'entrée et de sortie, et construit un évaluateur polynomial optimisé de cette fonction. Ce bloc de base a permis de développer des opérateurs en virgule flottante pour la racine carrée et l'exponentielle qui améliorent considérablement l'état de l'art. Nous avons aussi travaillé sur des techniques de compilation avancée pour adapter l'exécution d'un code C aux pipelines flexibles de nos opérateurs. FloPoCo a pu ainsi être utilisé pour implanter sur FPGA des applications complètes.
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Ніценко, Володимир Вікторович. "Підвищення показників ефективності функціонування релейного захисту збірних шин розподільчих установок". Thesis, Запорізький національний технічний університет, 2018. http://repository.kpi.kharkov.ua/handle/KhPI-Press/34557.

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Дисертація на здобуття наукового ступеня кандидата технічних наук (доктора філософії) зі спеціальності 05.14.02 – Електричні станції, мережі і системи. – Національний технічний університет "Харківський політехнічний інститут", Харків, 2018. Дисертація присвячена розв'язанню актуальної науково-прикладної задачі у галузі релейного захисту елементів електроенергетичних систем, що полягає у підвищенні ефективності дії релейного захисту збірних шин розподільчих установок. У роботі вдосконалено метод диференційно-фазного захисту шин, згідно з яким алгоритм порівняння фаз струмів застосовано у якості єдиного засобу забезпечення абсолютно селективної дії захисту в аварійних режимах, та запроваджено групу неконфігурованих параметричних уставок захисту, що сприяє зниженню ймовірності його неселективної дії через допущені персоналом помилки, а також, за рахунок оптимізації умов пуску та спрацювання захисту, підвищується їх успішність за внутрішніх коротких замикань, що дозволяє відмовитись від застосування окремого високочутливого органу захисту. Для поліпшення експлуатаційних характеристик та усунення режимних обмежень застосування пристроїв релейного захисту шин вдосконалено метод компенсації кутових похибок насичених трансформаторів струму у диференційно-фазному захисті шин в частині забезпечення подовження логічних імпульсів напруги, сформованих із напівхвиль спотворених струмів. Обрано робочі уставки параметрів налаштування диференційно-фазного захисту шин, а саме кута блокування ±φбл=900 та рівня формування імпульсів ±ір=(40-50)%·Іамп, за яких забезпечуватиметься його надійна та селективна дія в аварійних режимах. Проведено математичне і імітаційне моделювання поведінки диференційно-фазного захисту шин та лабораторні досліди його макетного зразку, що дозволило підтвердити адекватність розробленої моделі захисту, ефективність її алгоритмів та правильність обраних робочих уставок. Виконано аналіз техніко-економічних показників застосування диференційно-фазного захисту шин, на підставі якого визначені його переваги у порівнянні з пристроями диференційного струмового захисту шин та оцінені показники економічної ефективності його впровадження та експлуатації.
Dissertation for a candidate degree (PhD) in Engineering Sciences of the speciality 05.14.02 – Electric power stations, networks and systems. – National technical university "Kharkiv polytechnic institute", Kharkiv, 2018. The dissertation is devoted to the solution of the actual scientific and practical problem in the field of relay protection of electric power systems elements, which is to increase the efficiency of relay busbar protection of switchgears. In this work, the method of phasedifferential busbar protection has been improved, according to which the currents phases comparison algorithm is applied as the sole means of providing absolutely selective protection in emergency conditions, and a group of non-configured parametric settings is introduced that reduces the probability of its non-selective operation through mistakes made by the personnel, as well as due to optimization start and trip conditions of protection operation, its performance increases at internal faults, which allows to refuse the application a high-sensitive protection relay. In order to improve the performance and eliminate the regime limitation of the use of relay protection devices, the method of compensating angular errors of saturated current transformers in the phase-differential busbar protection in the part of ensuring the extension of logic voltage impulses formed from half-waves of distorted currents is improved. The working parameters of the phase-differential busbar protection have been selected, namely the blocking angle is 900 and the impulse formation level is (40-50)%·Іamp, which will ensure its reliable and selective operation in emergency conditions. The mathematical and simulation modeling of the phasedifferential protection behavior and laboratory experiments of its model was carried out, which allowed to confirm the adequacy of the developed model of protection, the efficiency of its algorithms and the correctness of the selected working settings. There were completed analysis of technical and economic indicators of the phase-differential busbar protection using, on the basis of which were determined its advantages compared with the devices of differential busbar protection and approximate estimates of the economic efficiency of its implementation and operation.
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Ніценко, Володимир Вікторович. "Підвищення показників ефективності функціонування релейного захисту збірних шин розподільчих установок". Thesis, НТУ "ХПІ", 2018. http://repository.kpi.kharkov.ua/handle/KhPI-Press/34554.

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Дисертація на здобуття наукового ступеня кандидата технічних наук (доктора філософії) зі спеціальності 05.14.02 – Електричні станції, мережі і системи. – Національний технічний університет "Харківський політехнічний інститут", Харків, 2018. Дисертація присвячена розв'язанню актуальної науково-прикладної задачі у галузі релейного захисту елементів електроенергетичних систем, що полягає у підвищенні ефективності дії релейного захисту збірних шин розподільчих установок. У роботі вдосконалено метод диференційно-фазного захисту шин, згідно з яким алгоритм порівняння фаз струмів застосовано у якості єдиного засобу забезпечення абсолютно селективної дії захисту в аварійних режимах, та запроваджено групу неконфігурованих параметричних уставок захисту, що сприяє зниженню ймовірності його неселективної дії через допущені персоналом помилки, а також, за рахунок оптимізації умов пуску та спрацювання захисту, підвищується їх успішність за внутрішніх коротких замикань, що дозволяє відмовитись від застосування окремого високочутливого органу захисту. Для поліпшення експлуатаційних характеристик та усунення режимних обмежень застосування пристроїв релейного захисту шин вдосконалено метод компенсації кутових похибок насичених трансформаторів струму у диференційно-фазному захисті шин в частині забезпечення подовження логічних імпульсів напруги, сформованих із напівхвиль спотворених струмів. Обрано робочі уставки параметрів налаштування диференційно-фазного захисту шин, а саме кута блокування ±φбл=900 та рівня формування імпульсів ±ір=(40-50)%·Іамп, за яких забезпечуватиметься його надійна та селективна дія в аварійних режимах. Проведено математичне і імітаційне моделювання поведінки диференційно-фазного захисту шин та лабораторні досліди його макетного зразку, що дозволило підтвердити адекватність розробленої моделі захисту, ефективність її алгоритмів та правильність обраних робочих уставок. Виконано аналіз техніко-економічних показників застосування диференційно-фазного захисту шин, на підставі якого визначені його переваги у порівнянні з пристроями диференційного струмового захисту шин та оцінені показники економічної ефективності його впровадження та експлуатації.
Dissertation for a candidate degree (PhD) in Engineering Sciences of the speciality 05.14.02 – Electric power stations, networks and systems. – National technical university "Kharkiv polytechnic institute", Kharkiv, 2018. The dissertation is devoted to the solution of the actual scientific and practical problem in the field of relay protection of electric power systems elements, which is to increase the efficiency of relay busbar protection of switchgears. In this work, the method of phasedifferential busbar protection has been improved, according to which the currents phases comparison algorithm is applied as the sole means of providing absolutely selective protection in emergency conditions, and a group of non-configured parametric settings is introduced that reduces the probability of its non-selective operation through mistakes made by the personnel, as well as due to optimization start and trip conditions of protection operation, its performance increases at internal faults, which allows to refuse the application a high-sensitive protection relay. In order to improve the performance and eliminate the regime limitation of the use of relay protection devices, the method of compensating angular errors of saturated current transformers in the phase-differential busbar protection in the part of ensuring the extension of logic voltage impulses formed from half-waves of distorted currents is improved. The working parameters of the phase-differential busbar protection have been selected, namely the blocking angle is 900 and the impulse formation level is (40-50)%·Іamp, which will ensure its reliable and selective operation in emergency conditions. The mathematical and simulation modeling of the phasedifferential protection behavior and laboratory experiments of its model was carried out, which allowed to confirm the adequacy of the developed model of protection, the efficiency of its algorithms and the correctness of the selected working settings. There were completed analysis of technical and economic indicators of the phase-differential busbar protection using, on the basis of which were determined its advantages compared with the devices of differential busbar protection and approximate estimates of the economic efficiency of its implementation and operation.
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SINGH, GURU SHARAN. "IMPACT OF RENEWABLE ENERGY SYSTEMS ON SHORT CIRCUIT LEVELS IN POWER SYSTEM DISTRIBUTION NETWORKS". Thesis, 2016. http://dspace.dtu.ac.in:8080/jspui/handle/repository/15277.

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The short circuit analysis secures the electrical power systems protection scheme. Thus, in turn ensures the power system reliability, safe mode of operation, and uninterruptable power supply. The impact of distributed generation on the power systems stability, power quality, and short circuit level is still unclear and uncertain. The different characteristics of each distributed generation type, such as synchronous generators, induction generators, power electronics inverters make it more complicated to assess. Studying the effect of the penetration of distributed generation on fault current level of existing distribution networks is crucial. This thesis will examine the impact of implementing distributed generation mix, including wind turbine generators, photovoltaic, and its combination on the fault current level of the distributed network under study. The short circuit analysis is carried out on the IEEE 37-bus distribution test system using ETAP 12.6 software. The simulation results are presented in a comparison between six cases, comparing the impact of the distributed generation mix on the fault current level at different levels of penetration. Moreover, a comparison showing the contribution of each distributed generation type separately as a percentage is presented. The selection of distributed generation technology and location has a significant impact on the fault current.
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CHANG, TSUNG-HSING, i 張宗興. "Specification and Impact Analysis of Minimum Short Circuit Current Level for 69KV Transmission System". Thesis, 1996. http://ndltd.ncl.edu.tw/handle/21702562335080058888.

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Książki na temat "SHORT CIRCUIT LEVELS"

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Popadyuk, Tat'yana, Irina Smirnova, Nataliya Linder, Arkadiy Trachuk, Gayk Nalbandyan, Anastasiya Karikova, Aleksandra Pogosyan i in. Modern electrical substations. ru: INFRA-M Academic Publishing LLC., 2022. http://dx.doi.org/10.12737/1861116.

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The textbook provides general information about the operating modes of electrical systems and substations, methods for calculating short-circuit currents and selecting electrical equipment for substations and power grids, classification of substations is given, designs of manual control transformers, high-voltage and low-voltage substations are considered, issues of their relay protection, requirements of electrical installation rules and technical operation rules for the device and operation of substations. It is intended for students of the training direction 13.03.02 "Electric power and electrical engineering", and can also be useful for students of secondary vocational education, masters and electrical engineers who improve their technical level on the job.
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Części książek na temat "SHORT CIRCUIT LEVELS"

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Jogi, Jay, Chetan Sheth, Vinod Gupta i Krunal Darji. "Reduction of Short-Circuit Level of EHV Substation". W Lecture Notes in Electrical Engineering, 53–63. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-0206-4_5.

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Linh, Pham Thi Thuy, Nguyen Ngoc Bach i Doan Van Binh. "Fault Diagnosis for the Short-Circuit Fault of the Single-phase Five-Level VIENNA Active Rectifier". W Advances in Engineering Research and Application, 452–59. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-64719-3_50.

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Li, Bo, Zhendong Peng, Pengfei Xie i Zhigang Ren. "A Forced Commutation Breaking Method of Dc Circuit Breaker Taking Account of Load Current Occasions". W Advances in Transdisciplinary Engineering. IOS Press, 2022. http://dx.doi.org/10.3233/atde220021.

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In the DC power system, the circuit breaker must not only complete the rapid disconnection and isolation of the high short-circuit fault current, but also undertake the frequent switching tasks of the small load rated current. First of all, this research adopts the topological structure of double-breaker series connection and introduction of auxiliary oscillating branch on the basis of forced commutation.Different control strategies can be adopted according to different current levels, which can realize the rapid breaking of small currents while improving high current breaking performance.Secondly, through the mathematical analysis of the working process of the circuit structure, and based on the PSCAD/EMTDC electromagnetic transient simulation software, the influence of different branch parameters on the breaking process is analyzed, and the circuit parameter optimization design is carried out for the breaking process of different load current levels.
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"Grounding Connections". W Advances in Computer and Electrical Engineering, 84–123. IGI Global, 2018. http://dx.doi.org/10.4018/978-1-5225-3853-0.ch003.

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This chapter sheds light on the following: TT system (earthed neutral), automatic disconnection for TT system, TN system (exposed conductive parts connected to the neutral), TN-C system, TN-S system- TN-C-S system, IT system (isolated or impedance-earthed neutral), IT system (impedance-earthed neutral), grounding transformer connection and design, grounding of industrial and commercial generators, Zigzag grounding transformer earthed systems (solid grounding, resistance grounding, reactance grounding, resonant grounding (ground-fault neutralizer), location of system grounding points selection and grounding locations specified by the NEC and multiple power sources. The chapter contains also the different methods used in determining the levels of short circuit current. It contains also details about the grounding through resistances for transformers and generators and reactances for overhead transmission lines.
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Lamberti, Mirko. "Experiences of Cooperative Learning and Social Learning to Manage Test Anxiety". W Handbook of Research on Didactic Strategies and Technologies for Education, 454–61. IGI Global, 2013. http://dx.doi.org/10.4018/978-1-4666-2122-0.ch040.

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In teaching environments, students that are in the same classroom do not always share the same basic skills. This is also true for ECDL classes. There is a big gap between those who have computers at home and can use them every day and those who do not. In the first case, kids can get distracted because they already know some of the materials and fail to see any new content. In the second case, intimidated by the comparison with more capable peers, learners run the risk of not feeling able to learn the subject. In this experiment, which involved 21 students from a class of the second year of a vocational school, a “short circuit” was put in place between students with different levels of basic skills in order to avoid loss of interest and increase the sense of self-efficacy necessary to take on any examination.
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Kumar, Kamlesh, i Mahesh Kumar. "Impacts of Distributed Generations on Power System". W Handbook of Research on New Solutions and Technologies in Electrical Distribution Networks, 171–90. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-1230-2.ch010.

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With increasing population and urbanization, the demand of electricity also increases day by day; to fulfill this demand, clean and environment-friendly distributed generations are being installed, but these have some issues in power section. With the integration of DG load curve is levelized, feeder voltage is improved; loading effect on the transformer and branches is reduced, and provides electricity with no pollution. This chapter investigates impacts of DGs to the power system; distributed generation means to generate electric power near the power consumption point. Power quality and reliability can be enhanced by the interconnection of distribution generation to an existing distribution system. However, there are so many effects of distributed generation e.g. changing of load losses, increasing of short circuit levels, voltage transient, congestions in the system branches, power quality, and reliability and network protection issues such as false tripping, nuisance tripping, unintentional islanding, neutral shifting is mainly affected.
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Libra, Martin, i Vladislav Poulek. "Physical Principles of the Photovoltaic Energy Conversion". W Handbook of Research on Renewable Energy and Electric Resources for Sustainable Rural Development, 327–51. IGI Global, 2018. http://dx.doi.org/10.4018/978-1-5225-3867-7.ch014.

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This chapter describes how the I-V characteristic of illuminated PV cells varies with temperature changes. The effect is explained according to the solid states theory. The higher temperature, the lower open-circuit voltage and the higher short-circuit current. This behavior is explained on the basis of band theory in solid-state physics. The increasing temperature causes a narrowing of the forbidden gap and a shift of the Fermi energy level toward the center of the forbidden gap. Both of these effects lead to a reduction of the potential barrier in the band diagram of the illuminated PN junction, thus to decrease of the photovoltaic voltage. In addition, the narrowing of the forbidden gap causes higher generation of electron-hole pairs in the illuminated PN junction and short-circuit current increases. The efficiency of the PV energy conversion decreases with the increasing temperature.
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Chander, Sweta, i Sanjeet Kumar Sinha. "Noise Analysis in Nanostructured Tunnel Field Devices". W 21st Century Nanostructured Materials - Physics, Chemistry, Classification, and Emerging Applications in Industry, Biomedicine, and Agriculture. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.100633.

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Tunnel Field Effect Transistors (TFETs) have appeared as an alternative candidate of “beyond CMOS” due to their advantages like very low leakage current and steep sub-threshold slope i.e. <60 mV/dec., etc. From past decades, researchers explored TFETs in terms of high ON current and steep subthreshold slope at low supply voltage i.e. < VDD = 0.5 V. The reliability issues of the device have profound impact on the circuit level design for practical perspectives. Noise is one of the important parameters in terms of reliability and very few research papers addressed this problem in comparison to other parameter study. Therefore, in this chapter, we discussed the impact of noise on Tunnel FET devices and circuits. The detail discussion has been done for the random telegraph noise, thermal noise, flicker noise, and shot noise for Si/Ge TFET and III-V TFETs. Recent research work for both low frequencies as well high frequency noise for different TFET device design has been discussed in details.
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Sunil Kumar, Kanithi, i V. U. P. Lavanya. "Topological and Control Aspects of 3-Phase 2-Level Fault Tolerant Inverter for Induction Motor Application". W Advances in Transdisciplinary Engineering. IOS Press, 2022. http://dx.doi.org/10.3233/atde220754.

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Fault-tolerant inverter plays a vital role to mitigate any short circuit or open circuit fault in the inverter that may be encountered. Additional switches and redundant legs of an inverter are used to design fault-tolerant mechanisms for the inverter. This paper provides the topology aspect and control aspects of a 3-phase 2-level fault-tolerant inverter for induction motor application. Different fault-tolerant topologies and their respective control strategies have been developed in this paper. This work presents an investigation into the topological and control aspects of a fault-tolerant inverter system that is applied to an alternating current motor drive. In this paper, two distinct fault-tolerant inverter topologies, as well as their closed-loop control, are described in greater detail. In order to validate the theoretical part of the work, findings from simulations have been supplied.
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Mebrahtu, Fsaha. "Voltage Drop Mitigation in Smart Distribution Network". W Handbook of Research on New Solutions and Technologies in Electrical Distribution Networks, 64–77. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-1230-2.ch004.

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Voltage dip in the distribution network is caused by disturbance at different voltage levels and experienced by low voltage customers are established. Voltage dips are those disturbances which damage the power quality of the distribution network and causing heavy economic damage to the customers. This chapter investigates procedures of mitigating the voltage dip by reducing the number of faults due to short circuits, lowering the fault clearing time, and changing the power system design and DSTATCOM Compensator with DG and dynamic voltage restorer.
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Streszczenia konferencji na temat "SHORT CIRCUIT LEVELS"

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Egorov, Aleksandr, Stanislav Eroshenko, Aleksandra Khalyasmaa i Kirill Zinovyev. "Research on short-circuit current levels in Sverdlovsk power system". W 2018 IEEE 59th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON). IEEE, 2018. http://dx.doi.org/10.1109/rtucon.2018.8659838.

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Sanodiya, Pradeep Kumar, M. Venkateswara Rao, Chitrankshi Ghangrekar, Vivek Pandey, S. Pushpa i K. Muralikrishna. "Limiting Short circuit levels through network reconfiguration: An experience in India". W 2020 21st National Power Systems Conference (NPSC). IEEE, 2020. http://dx.doi.org/10.1109/npsc49263.2020.9331931.

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Bhagwatikar, G. R., i W. Z. Gandhare. "Impact of Voltage and Short Circuit Level on Harmonics Generated by Wind Turbines". W ASME 2005 Power Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/pwr2005-50121.

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The paper presents the measurements at wind power project and 220/33 kV sub-station, which is dedicated for wind power evacuation, Satara district of Maharashtra State, India for the comparison of voltage harmonics generated by grid connected wind turbines, at different voltage levels: 415 V, 33 kV and 220 kV to see the effect of voltage and short circuit level of the grid. The parameters like voltage distortion factor, harmonics and crest factor are monitored. The short circuit level of the grid network is very high than the wind power penetration into the network, the impact of wind turbines on power quality is not significant. A trend in wind power quality parameters is seen even though the measurements could not be taken simultaneously on all voltage levels.
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Singh, Manohar, i Vishnuvardhan Telukunta. "Adaptive over current relay coordination algorithm for changing short circuit fault levels". W 2015 IEEE Innovative Smart Grid Technologies - Asia (ISGT ASIA). IEEE, 2015. http://dx.doi.org/10.1109/isgt-asia.2015.7387175.

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Castelli, G. "About the quasistationary behaviour during a short circuit between different voltage levels". W 18th International Conference and Exhibition on Electricity Distribution (CIRED 2005). IEE, 2005. http://dx.doi.org/10.1049/cp:20051191.

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Afifi, S. N., i M. K. Darwish. "Impact of hybrid renewable energy systems on short circuit levels in distribution networks". W 2014 49th International Universities Power Engineering Conference (UPEC). IEEE, 2014. http://dx.doi.org/10.1109/upec.2014.6934697.

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G. Lopes, Vinicius, i Fabricio L. Lirio. "Power Systems Performance Evaluation on High Renewable Penetration Levels". W Simpósio Brasileiro de Sistemas Elétricos - SBSE2020. sbabra, 2020. http://dx.doi.org/10.48011/sbse.v1i1.2370.

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The paper proposes a novel approach for system performance measurement and evaluation on asynchronous generation high penetration levels scenarios. The concept of the Multi-Infeed Interaction Short Circuit Ratio (MISCR) is extended for multiple asynchronous sources. Different scenarios combining wind power penetration levels and capability factors are analyzed, considering the IEEE benchmark 39-Bus system modified and a simplified full converter (FC) wind generation model. The results suggests that the traditional approaches from the Short Circuit Ratio (SCR) be more conservative than the proposed methodology.
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Landfors, Fred, Gunnar Ingestrom, Goran Stromberg i Somnath Chakraborty. "Series Capacitor Made Less - or not at all Sensitive to Increasing Short Circuit Levels". W 2008 Joint International Conference on Power System Technology and IEEE Power India Conference (POWERCON). IEEE, 2008. http://dx.doi.org/10.1109/icpst.2008.4745177.

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Afifi, S. N., H. Wang, G. A. Taylor i M. R. Irving. "Impact of DFIG wind turbines on short circuit levels in distribution networks using ETAP". W 2013 48th International Universities' Power Engineering Conference (UPEC). IEEE, 2013. http://dx.doi.org/10.1109/upec.2013.6714976.

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Eroshenko, S. A., A. O. Egorov, M. R. Zagidullin i M. D. Senyuk. "The indicators system for the short circuit currents levels assessment in the power systems". W 2017 15th International Conference on Electrical Machines, Drives and Power Systems (ELMA). IEEE, 2017. http://dx.doi.org/10.1109/elma.2017.7955419.

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Raporty organizacyjne na temat "SHORT CIRCUIT LEVELS"

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VanZomeren, Christine, Kevin Philley, Nia Hurst i Jacob Berkowitz. Wildrice (Zizania palustris; Manoomin) biology, functions and values, and soil physiochemical properties affecting production : a review of available literature. Engineer Research and Development Center (U.S.), sierpień 2023. http://dx.doi.org/10.21079/11681/47513.

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Wildrice (Zizania palustris L.) is an annual aquatic emergent plant primarily distributed across portions of Minnesota, Wisconsin, Michigan, and Canada. Wildrice requires narrow environmental conditions that vary throughout its life cycle. Environmental conditions required include water levels between 15 and 90 cm, slow flowing water, anaerobic soil, and circum-neutral pH. Wildrice production and abundance is most often limited by nitrogen availability. Both short- and long-term changes in local conditions impact distribution and abundance of wildrice at local and regional scales. Reported declines in wildrice production have increased interest in evaluating changing environmental conditions, specifically within the Upper Peninsula of Michigan. Wildrice, or manoomin, is an important food and cultural resource, and remains important to native peoples throughout the region, including the Lac Vieux Desert Band of Lake Superior Chippewa Indians. This report provides a review of literature related to wildrice and examines potential factors affecting its production in the Upper Peninsula of Michigan. This report highlights cultural and traditional values, functions and values of wildrice, and unique chemical and physical aspects of the environment where wildrice grow. Additionally, this report synthesizes the data gathered in the literature review, identifies knowledge gaps, and provides research opportunities for improved wildrice production in the Great Lakes region.
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