Готові списки джерел за темами / Ferroresonance processes

Добірка наукової літератури з теми "Ferroresonance processes"

Автор: Grafiati
Опубліковано: 30 травня 2022
Оновлено: 31 травня 2022

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Статті в журналах з теми "Ferroresonance processes"

1

Kutija, Martina, and Luka Pravica. "Effect of Harmonics on Ferroresonance in Low Voltage Power Factor Correction System—A Case Study." Applied Sciences 11, no. 10 (May 11, 2021): 4322. http://dx.doi.org/10.3390/app11104322.

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Анотація:
This paper presents a case study of three-phase ferroresonance in a low-voltage power factor correction system and investigates the influence of harmonic distortion on the occurrence of ferroresonance. Ferroresonance is an extremely dangerous and rare phenomenon that causes overvoltages and overcurrents in the system and degrades the power quality. The study is carried out on real field measurements in an industrial plant where ferroresonance occurs in the power factor correction (PFC) system at the detuned reactor. The three-phase ferroresonance analysed in this paper is an extremely rare phenomenon that has never been reported in this type of configuration. The measurement results have shown that in this type of configuration the high harmonic distortion is a necessary condition for ferroresonance to occur. In such conditions, switching on the capacitor stage triggers the ferroresonance with quasi-periodic oscillations supported by the medium voltage grid. The main contribution is the analysis of the three-phase ferroresonance in the detuned PFC system and the influence of the harmonics on the occurrence of the ferroresonance in such a case. The possible solutions to this problem and recommendations to avoid this phenomenon are discussed.
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2

Bakhor, Zinovii, Andrii Yatseiko, and Roman Ferensovych. "Assessment of ferroresonance processes in schemes of 6-35 kV electrical grids on the basis of reliability analysis." Energy engineering and control systems 6, no. 2 (2020): 137–45. http://dx.doi.org/10.23939/jeecs2020.02.137.

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Анотація:
The object of research is the choice of the optimal technical solution to prevent the development or the long existence of ferroresonance processes in electrical distribution grids of 6-35 kV, which are operated in isolated neutral mode. A lot of factors such as the grounding mode of a grid neutral, its capacitive current of a short circuit to the ground, the type and number of voltage transformers (VT) etc. influence on the probability of occurrence and duration of ferroresonance processes. According to the results of the research, the values of capacitive currents of a short circuit to the ground at which stable ferroresonance processes occur in electrical distribution grids of 6-35 kV are determined. The values of capacitive earth fault currents of a grid are decisive for the occurrence of a stable ferroresonance, but the nature of its flow is also influenced by additional accidental factors, such as: a grid voltage, an insulation status of power lines, a load of the secondary winding of voltage transformer etc. Therefore, a model for assessment the frequency of occurrence of a stable ferroresonance process in the electrical grid based on the analysis of the reliability of physical objects in the conditions of external actions was developed. In addition, an algorithm for determining the most dangerous scheme configurations of electrical grids concerning to a VT damage by the frequency of occurrence of a stable ferroresonance process in them and the choice of optimal solutions to prevent the VT damage were proposed.
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3

Tovboyev, A. N., D. Sh Mardonov, A. X. Mamatazimov, and S. S. Samatova. "Analysis of subharmonic oscillations in multi-phase ferroresonance circuits using a mathematical model." Journal of Physics: Conference Series 2094, no. 5 (November 1, 2021): 052048. http://dx.doi.org/10.1088/1742-6596/2094/5/052048.

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Анотація:
Abstract The article about solution of system of nonlinear differential equations that are almost impossible to solve by analytical methods by constructing a mathematical model of nonlinear oscillations occurring in three-phase ferroresonance circuits. A system of nonlinear differential equations was formed by approximating the volt-ampere characteristics of a ferromagnetic element in a ferroresonance circuit. Mathematical models for solving technical problems characterizing subharmonic oscillation processes in three-phase ferroresonance circuits and systems using the finite-difference method are expressed in the form of differential equations without appropriate initial conditions. Amathematical model of a system of equations representing subharmonic oscillations in ferroresonance connections depending on the value of the selected parameters in the field of change of any variable is considered.
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4

CAZACU, Emil, and Lucian PETRESCU. "ASPECTE CALITATIVE ȘI CANTITATIVE ALE FENOMENUL DE FEROREZONANȚĂ ÎN INSTALAȚIILE ELECTRICE DE JOASĂ TENSIUNE." "ACTUALITĂŢI ŞI PERSPECTIVE ÎN DOMENIUL MAŞINILOR ELECTRICE (ELECTRIC MACHINES, MATERIALS AND DRIVES - PRESENT AND TRENDS)" 2020, no. 1 (February 10, 2021): 1–14. http://dx.doi.org/10.36801/apme.2020.1.8.

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Анотація:
The phenomenon of ferroresonance is generated by the interaction between nonlinear magnetic devices and capacitive elements in an electrical installation in which losses are reduced and which are constantly supplied by at least one energy source. Feroresonance is manifested by the appearance of overvoltages and overcurrents in the installation with strongly distorted waveforms. Also, the phenomenon is accompanied by other disturbances of the quality of electricity (voltage fluctuations, asymmetries, noise, etc.), which propagate in the network affecting the proper functioning of the entire installation. In addition, unlike linear resonance, ferroresonance allows the manifestation of several stable states (modes) for the same parameters of the network, these being imposed by the initial conditions in the installation and the moment of occurrence of the phenomenon. Thus, the vulnerability to low resonance of a low voltage installation has become an indicator of electricity quality. This paper presents a procedure for calculating and investigating this phenomenon based on the analysis of numerical solutions of systems of differential equations (nonlinear and non-autonomous), which models the transient phenomena that initiate the appearance of ferroresonance (usually switching processes). Also, modern means of investigation are used (3D visualizations in the phase plan or Poincaré diagrams), imposed by the difficulty of the quantitative analysis both in dynamic regime and in stationary regime of ferroresonance. In addition, methods and procedures are proposed to mitigate the effects of the ferroresonance phenomenon on equipment or network elements in electrical distribution installations.
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5

Hanus, Oleksii, and Kostiantyn Starkov. "STUDY OF THE NATURE OF OVERVOLTAGES IN THE ELECTRICAL NETWORK ARISING FROM VOLTAGE TRANSFORMERS." Bulletin of the National Technical University "KhPI". Series: Energy: Reliability and Energy Efficiency, no. 1 (2) (July 2, 2021): 28–36. http://dx.doi.org/10.20998/2224-0349.2021.01.05.

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Анотація:
A non-linear dynamic mathematical model of voltage transformer has been considered and overvoltages arising on the elements of voltage transformer equivalent circuit during transient processes have been investigated. The influence of voltage transformer secondary circuit capacitance on overvoltage multiplicity in the primary circuits and the duration of transients has been determined. The advantages of approximation of nonlinearity of voltage transformers by hyperbolic sine are used. Mathematical expressions determining the nature of changes in the forced and free components of the transient process in an electrical network with a voltage transformer have been obtained. It is shown that with the increase of the electric network capacitance the duration of the transition process damping increases and the frequency of the forced oscillations and the level of overvoltage decrease. It is proved that even small, in comparison with the primary nominal sinusoidal voltage, aperiodic components of the voltage transient process can lead to significant overvoltages during voltage transformer outages. It has been substantiated that both the secondary resistance and the switching torque influence the overvoltage multiplicity arising in the primary winding of voltage transformers. It is shown that the closed secondary winding worsens the disconnection process of non-linear inductance of voltage transformers. The values to which overvoltages increase in this case are determined. According to the results of calculations it is determined that with open secondary winding of voltage transformers the duration of transient process significantly increases. It has been found that the decrease of frequency of forced oscillations, which occurs in this case, is accompanied by an increase of currents in the primary winding of the voltage transformer, which is dangerous in terms of thermal stability of the winding insulation. It is shown, that closing the secondary winding of voltage transformers leads to significant reduction of transient damping time. It is suggested that this algorithm can be used to provide a rapid breakdown (suppression) of ferroresonant processes. The effectiveness of such a measure of stopping of ferroresonance processes as short-term shunting of secondary winding of voltage transformers has been investigated. The correlation of parameters of electric networks (capacity of busbar sections, nonlinearity of characteristics of voltage transformers, disconnection torque, etc.) at which ferroresonance process may occur and consideration of which may allow, in terms of prevention of ferroresonance processes, to identify substations (electric networks) that require more detailed research has been determined. The results of analytical studies were tested in the electric networks of JSC "Kharkivoblenergo" and used in the electricity distribution system for the selection of specific voltage transformers for certain configurations of electrical networks.
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6

Yang, Ming, Wenxia Sima, Pan Duan, Mi Zou, Daixiao Peng, Qing Yang, and Qichang Duan. "Electromagnetic transient study on flexible control processes of ferroresonance." International Journal of Electrical Power & Energy Systems 93 (December 2017): 194–203. http://dx.doi.org/10.1016/j.ijepes.2017.05.026.

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7

IBADULLAEV, Muhtarhan, Akrom N. TOVBAEV, and Azamat Zh ESENBEKOV. "On the General Theory for Analysis of Subharmonic Oscillations in Three-Phase Ferroresonance Circuits and Systems." Elektrichestvo, no. 12 (2021): 35–44. http://dx.doi.org/10.24160/0013-5380-2021-12-35-44.

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Анотація:
The general theory for analysis of subharmonic oscillations at a frequency of ω/3 in three-phase ferroresonance circuits is presented. The occurrence and existence of ferroresonance oscillations at subharmonic frequencies in power transmission lines and power supply systems is highly undesirable, since they cause overvoltages at various frequencies. At the same time, there is an extensive class of nonlinear electrical circuits in which the excitation of autoparametric oscillations at the frequency of subharmonics forms the basis of phase-discrete frequency converting devices serving as secondary power sources. To study the regularities of excitation and maintaining of subharmonic oscillations at a frequency of ω/3 in three-phase ferroresonance circuits, theoretical and experimental studies of an equivalent model of a three-phase circuit with nonlinear inductance were carried out. A generalized nonlinear differential equation for a three-phase circuit with mixed connection of its elements is derived. The steady-state mode of subharmonic oscillations at a frequency of ω/3 is analyzed using the small parameter (averaging) method, which made it possible to determine their existence domains and circuit critical parameters. A mathematical model and algorithm for calculating autoparametric oscillations have been developed to study the subharmonic oscillation excitation processes at a frequency of ω/3 in three-phase ferroresonance circuits depending on the initial conditions, circuit parameters and input voltage. The theoretical study results have been confirmed experimentally.
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8

Podbereznaya, Irina, and Aleksandr Tkachev. "Simulation of Ferroresonance Modes in Nonlinear Electrical Circuits Taking Into Account Magnetic Hysteresis." Известия высших учебных заведений. Электромеханика 65, no. 1 (2022): 13–24. http://dx.doi.org/10.17213/0136-3360-2022-1-13-24.

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Анотація:
The article provides a solution to the problem of numerical simulation of the resonant modes of voltages and cur-rents in electrical circuits arising from the serial and parallel connection of nonlinear inductive and capacitive elements. The Weber-ampere characteristic of the inductive element is set taking into account the hysteresis. Fer-roresonance modes arise in electrical circuits containing capacitive and nonlinear inductive elements, including power transformers, arc-extinguishing reactors, current and voltage measuring transformers, electric motors. The nonlinearity of the characteristics of inductive elements is the reason that when their magnetic systems are saturated, differential inductances change, resulting in ferroresonance, often abnormal and even emergency modes. A modified inverse Jiles-Atherton model is used to simulate magnetic hysteresis. Numerical integration of differential equations describing dynamic processes in electrical circuits is performed by the explicit Euler meth-od. As a result of the calculations performed, it is shown that as a result of ferroresonance, a trigger effect oc-curs, which manifests itself in the form of an abrupt change in the state of the circuit caused by the ambiguous nature of the volt-ampere characteristic for the input voltage and current. The proposed method of modeling transient and steady-state modes in nonlinear electrical circuits, taking into account magnetic hysteresis, can be generalized to the case of arbitrary circuits, including those with complex topology.
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9

Kazhekin, Ilia Evgenievich. ". Generating maximum overvoltages in ferroresonant processes during single-phase arc shorts in ship low-voltage electrical systems." Vestnik of Astrakhan State Technical University. Series: Marine engineering and technologies 2020, no. 1 (February 17, 2020): 115–24. http://dx.doi.org/10.24143/2073-1574-2020-1-115-124.

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Анотація:
The article discusses processes with single-phase faults in shipboard low-voltage electrical plants with a neutral grounded through a reactor. In such electrical plants, ferroresonant oscillations occur if one of the phases closes to the housing. The oscillations have an influence on the process of generating maximum arc overvoltages during single-phase shorts on the housing. The conditions for appearing ferroresonant phenomena in low-voltage ship electrical networks are studied. The processes in the ferroresonant circuit have been analyzed, the initial conditions necessary for their excitation have been identified. The processes causing the initial conditions in the power supply network that are sufficient for generating ferroresonant oscillations when the phase is closed to the housing have been considered. The conditions favorable for ferroresonant excitation are created due to the behavior of the low-voltage grounding arc and subsequent transient processes in the zero sequence circuit. Maximum overvoltages accompanied by ferroresonant processes occur when the grounding arc is burned in accordance with the theory of Peters and Slepian, that is, when it is extinguished at a moment close to the transition through the zero value of the forced component of the single-phase current short. The arc causes the increased voltages on the neutral grounding elements. As a result, the neutral bias voltage at a constant potential increases significantly. Based on the magnitude of the neutral bias voltage at a constant potential, the effect of ferroresonant oscillations on the maximum overvoltages arising in strong phases is estimated. The quoted formulas help to calculate the maximum values of arc overvoltages. The reliability of the proposed methodology for calculating overvoltages is confirmed by the studies performed on the physical model of the ship electrical network.
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10

Shaymatov, Bobokul, Maktuba Rakhmatova, Sardor Komilov, and Dilnoza Qurbonova. "The use of frequency converters on three-circuit ferroresonant circuits." E3S Web of Conferences 264 (2021): 05019. http://dx.doi.org/10.1051/e3sconf/202126405019.

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Анотація:
In this paper, the processes of formation of low-frequency currents in the circuits of ferromagnetic oscillations are analyzed, and the theory of the formation of secondary amplitude frequencies of soft excitation of parallel and series-connected ferroresonant chains is developed. Based on this, considering the use of frequency dividers in the irrigation system shown in Figure 1, it is possible to carry out experiments on the study of multi-circuit frequency dividers. Therefore, the study of spontaneous (soft) vibration processes in multi-circuit ferroresonant electric circuits of periodic changes in the parameters of a ferromagnetic element generated by the resulting harmonic oscillations (HA) and their development and application of improved sources of harmonic signals for telecontrol of the system in power lines, switchgears and drainage networks.
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Дисертації з теми "Ferroresonance processes"

1

Заболотній, Денис Ігорович. "Методи виявлення ферорезонансних процесів в електричних мережах з великими струмами замикання на землю". Master's thesis, КПІ ім. Ігоря Сікорського, 2019. https://ela.kpi.ua/handle/123456789/31661.

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Анотація:
Магістерська дисертація складається з пояснювальної записки та графічної частини. Пояснювальна записка виконана на 216 сторінках формату А4, в яку входять 87 таблиць та 75 рисунків. Графічна частина містить 8 аркушів технічних креслень формату А1. В магістерській дисертації виконано проект районної електричної мережі напругою 110 кВ та електричної частини підстанції 110/35/10 кВ. Розроблено стартап-проект, розглянуто питання релейного захисту та охорони праці. Досліджено застосування ферорезонансних процесів.
The master's dissertation consists of an explanatory note and a graphic part. The explanatory note is made on page 216 of A4 format, which includes 87 chart and 75 figures. The graphic part contains 8 sheets or technical drawings of A1 format. In the master's thesis the project of the district electric network 110 kV and the electrical part of the substation 110/35/10 kV was executed. A startup project has been developed, issues of relay protection and labor protection have been considered. The application of ferroresonance processes is investigated.
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Тези доповідей конференцій з теми "Ferroresonance processes"

1

Tugai, Yurii I., and Iryna Y. Tugai. "A combined method for study of ferroresonance processes in voltage transformer." In 2014 IEEE International Conference on Intelligent Energy and Power Systems (IEPS). IEEE, 2014. http://dx.doi.org/10.1109/ieps.2014.6874205.

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2

Kadomskaya, K. P., A. V. Ivanov, and O. I. Laptev. "Ferroresonance processes in electrical networks caused by saturation of voltage-transformer cores." In 2005 IEEE Russia Power Tech. IEEE, 2005. http://dx.doi.org/10.1109/ptc.2005.4524388.

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3

Gusev, O. Y., Y. P. Gusev, and A. E. Yuzhanin. "FERRORESONANCE PROCESSES CAUSED BY SINGLE-PHASE EARTH FAULTS IN DISTRIBUTION NETWORKS WITH COMPENSATED NEUTRAL." In Актуальные проблемы электроэнергетики. Нижний Новгород: Нижегородский государственный технический университет им. Р.Е. Алексеева, 2021. http://dx.doi.org/10.46960/44170389_2021_337.

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4

Tygai, Yurii I., and Alexander B. Besarab. "The mathematical model of voltage transformers for the study of ferroresonant processes." In 2014 IEEE International Conference on Intelligent Energy and Power Systems (IEPS). IEEE, 2014. http://dx.doi.org/10.1109/ieps.2014.6874207.

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