http://ea.donntu.ru/handle/123456789/23132 2013 г. 2026-03-07T21:39:26Z http://ea.donntu.ru/handle/123456789/23514 Title: ЕКСПЕРИМЕНТАЛЬНЕ ДОСЛІДЖЕННЯ НАПРУГИ НУЛЬОВОЇ ПОСЛІДОВНОСТІ РОЗПОДІЛЬНОІ МЕРЕЖІ В ЧАСТОТНІИ ОБЛАСТІ Authors: Лисенко, В.А.; Лысенко, В.А.; LYSENKO, V.A. Abstract: Наведено результати експериментальних досліджень напруги нульовоі послідовності в розподільних електричних мережах. Досліджено вплив частотних складових на роботу автоматики систем компенсації ємнісного струму однофазного замикання на землю. Запропоновано заходи щодо зменшення негативного впливу частотних складових і математичну модель напруги нульовоі послідовності в частотніи області. Description: In resonance earthed medium voltage network, the tumng of the Petersen coil is a critical issue for system performance. For resonance grounded network it is necessary to continues match the coil with the network capacitance to earth. This paper is based on testing results of real network. This paper investigates zero sequence voltage interference affecting the Petersen coil automatic tumng device. We cover devices that implement the “frequency” principle of Petersen coil control. Appropriate limits for the study of zero-sequence voltage in the frequency domain are defined. The causes of noise appearing in zero-sequence voltage electric network with ungrounded neutral are analyzed. Time harmomcs are produced by induction motors as a result of the harrnomc content of the m.m.f. distribution. Harmomcs can also occur as a result of electrical asymmetry. Consider an electrically unbalanced rotor winding, the stator winding being balanced such that the supply voltage produces a pure rotating field. Slip frequency e.m.f. is induced in the rotor, but since the rotor winding is unbalanced, both positive and negative phase sequence currents will flow, giving fields in the forward and reverse directions. Integral Cycle Control thyristors regulator, also called ‘burst-firing’ regulator is based on the switching of entire voltage half-cycles. That integral cycle control produces no harrnomc frequencies. It does, however, produce inter-harrnomc and subharmomc frequencies. Zero sequence voltage data are acquired in July, 2011. The analysis is carried out using the software PyLab, MATLAB. The analysis is based on Discrete Fourier transform (DFT) algorithm. The Zero sequence voltage was sampled at 44.1-kHz sampling rate and interfaced to a PC using sound card «Realtek High Defimtion Audio». Typically, voltage power spectra are based on a 4096-points FFT. The results of experiment in the real distributing electrical networks are presented. The acquired data are used to generate a model. Zero-sequence voltage noise consists of the main generated (or fundamental) sine signal, third and higher odd harmomcs of the fundamental sine, white noise, pink flicker noise. Referred noise model can be used in the construction of Petersen coil automatic tuning device that implements the “frequency” principle. 2013-01-01T00:00:00Z http://ea.donntu.ru/handle/123456789/23513 Title: ОЦІНКА ЕФЕКТИВНОСТІ ЗАСТОСУВАННЯ ЛОКАЦІИНОГО МЕТОДУ ДЛЯ ВИЗНАЧЕННЯ МІСЦЯ ПОШКОДЖЕННЯ В МЕРЕЖАХ НАПРУГОЮ 6-35 кВ Authors: КУТІНА, М.В.; КУТИНА, М. В.; KUTINA, M. V. Abstract: Запропоновано застосування локаціиного методу для визначення місць пошкоджень в мережах напругою 6-35 кВ зі складною топологією. Дано оцінку ефективності застосування локаційного методу при порівнянні його з існуючими методами пошуку місць пошкоджень в мережах напругою 6-35 кВ зі складною топологією. Description: In this article the evaluation of the effectiveness of location method for fault location in distribution power networks with complex topology voltage 6-35 kV. Evaluation of the effectiveness of location method is carried out by deterrmmng and comparing the reliability of the proposed method for deterrmmng the damage with two basic, which elected based on the need to achieve a certain effect. As a first basic option are used devices Search-l", "wave", "probe", "VPI-l" and others. As a second basic variant of the method proposed successive divide network with optimized algorithm. The calculations for 10 real substations from which retreated 73 lines showed that the application of location method, except social effect to enhance safety operation of distribution networks, allowing comparison with the first base variant, reducing the average search time of the injury site at 2 times the coefficient efficiency is 1.98, increase availability factor by an average of 0.6%, lower coefficient of downtime on average by 40%, increase the ratio of technical applications and operational readiness rate by an average of 0.7%. Compared with the second base variant, using location method reduces loss electricity almost 3 times , coefficients efficiency of decreasing search time location of the damage and loss of electricity are respectively 9.99 and 2.91. 2013-01-01T00:00:00Z http://ea.donntu.ru/handle/123456789/23512 Title: ОПТИМІЗАЦІЯ ПАРАМЕТРІВ ПРИСТРОЮ КОНТРОЛЮ ШВИДКІСНИХ ХАРАКТЕРИСТИК ВИСОКОВОЛЬТНИХ ВИМИКАЧІВ Authors: Кутін, В.М.; Кутин, В.М.; KUTIN, V. M.; Рубаненко, О.Є.; Рубаненко, О.С.; RUBANENKO, O.E.; Мисенко, С.В.; MYSENKO, S.V. Abstract: Обґрунтовується необхідність вдосконалення методів та засобів технічного діагностування високовольтних вимикачів для підвищення іх надійності в умовах експлуатації. Показано залежність зміни падіння напруги на сенсорі пристрою контролю швидкісних характеристик від частоти високочастотного сигналу. Визначено оптимальне значення частоти високочастотного сигналу при якому отримується найбільше значення падіння напруги на опорі сенсора. Description: In electrical transmission systems and high voltage switching device auto major steps which are performed by any change in current circuits at all possible at this point the system modes are switches. Typical switching operations for switches are off current overload and short circuit, switch to short circuit shutdown by dividing asynchronous operating systems, disable the capacitive currents idling routes, off inductive currents unloaded transformer. Reliable performance of l1igh-voltage circuit breakers largely depends on the technical condition of arc chutes and drive mechamsm. During shutdown short circuit in arc chutes are heavy thermal processes, the nature of which depends on passing speed arcing contact, maximum magmtude and nature of change of pressure gaseous environment in the working volume, flow characteristics arcing environment in the area extinguishing the arc in separate stages electric unlocking , rate of stretching and moving logs arc. All above mentioned characteristics arc devices depend on the type and the operating principle of the drive mechamsm, the deterioration of which may not switch off or irregular his work. Currently, the speed characteristics are deterrmned mainly by Olivet breakers and some types of Logic switches using sensors of angular and linear displacement. In other types of switches deterrmne speed characteristics limited design features. Therefore, the proposed control parameters passing test RF signal through a contact chamber air and gas insulated switches during their operation. Consideration of these parameters at different frequencies can improve the accuracy of control for the qualitative detection of the aforementioned defects at an early stage of their development. Changing parameter RF signal is hopping, so you need to optimize the parameters of momtoring device speed performance for more informative test results, namely a smooth change of the controlled parameter. To optimize the parameters of l1igh-frequency signal was found optimal frequency RF signal, which is 150 kHz. 2013-01-01T00:00:00Z http://ea.donntu.ru/handle/123456789/23511 Title: ОПИСАНИЕ УСТРОИСТВ РЕЛЕИНОИ ЗАЩИТЫ И АВТОМАТИКИ СТРУКТУРНО-ИНФОРМАЦИОННЫМ МЕТОДОМ Authors: Никифоров, Андрей Петрович; Нікіфоров, Андрій Петрович; NIKIFOROV, A.P.; Смирнова, Мария Александровна; Смірнова, Марія Олександрівна; SMIRNOVA, M.A. Abstract: Показано, что известные устройства и терминалы релейной защиты и автоматики (РЗиА) возможно заменить обобщенной эквивалентной структурной схемой двухвходового устройства. Такая упрощающая абстракция позволяет эффективно решать задачи анализа, синтеза, оптимизации, совершенствования, унификации, обучения и др. в области РЗиА. Абстракция помогает оперировать потоками информации во множестве связанных объектов управления и защиты, к которым сводятся участки электрических сетей разных классов напряжений для традиционных и смарт-грид построений. Двухвходовое, а в пределе одновходовое устройство, является многопараметрическим обработчиком потока информации и относится к области технического интеллекта. Приводится описание структурно-информационного метода, на основе которого получена предлагаемая абстракция. Description: Combination of many factors: expansions of multi-criteria terminals of Relay Protection and Automatics (RPA), building smart-grid electrical networks, problems of RPA solving for specific objects of control and protection (OCP) showed the necessity to operate by the information flows to a higher abstract level with reservation the information about OCP and RPA in the description. OCP groups in power industry usually work together and are connected energetically, galvanically and informationally. In this regard, there is possibility to allocate a separate type of OCP - array of associated OCP (AAOCP). It is shown in the paper that the well-known devices and terminals of RPA can be replaced by a generalized equivalent structural circuit (GEC) of two-input device. GEC device consists of two elements: generalized filter and threshold umt. This simplifying abstraction gives possibility to effectively solve problems of the analysis, synthesis, optimization, development, standardization, traimng, etc. of RPA. Abstraction helps to operate with the information flows in AAOCP where the parts of electrical networks of various voltage classes of traditional and smart grid constructions are thrown together. Two-terrninal, and in the lin1it one-terminal GEC-device, is a multi-parameter processor of the information flow and relates to the field of technical intellect. A structure-information (SI) method is described in the paper. On the basis of this method the proposed abstraction is obtained. A theoretical basis of SI method and evidence of its effectiveness are developed. SI method involves structural-operator, structural-linguistic and structural-l1ierarcl1ical methods. SI-method is umversal and can perform various tasks related to the analysis, synthesis and control of the flow of sense situations in the research object. In this paper one more element of SI method’s theoretical basis, rationale of use of GEC device, is developed. According to SI method, a generalized tree, for recognition of known schemes the balanced discriminators and detectors, is made. Grammar, a list of rules "Yes-No" are compiled. Grammar allows the study the quality of the well-known devices, the devices under development and RPA systems. The hierarchical line of solutions design of discriminators from "simple" to "perfect" is built. The line enables to perform qualitative and quantitative evaluations of the effectiveness of RPA devices and count indicators of developed RPA devices. Relative action device, balanced discriminator or phase detector (PD), is in the basis of the evolution line of RPA devices. In this case absolute action device of RPA are simplification of GEC device.The proposed in the article smart detector "Yes-No" turns the most perfect". Joint-work of GEC device and AAOCP in the unified intellectual smart grid automatic control system is discussed. The examples of structural circuits of smart control systems in the smart-grid electric networks are presented. 2013-01-01T00:00:00Z