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Дисертації з теми "621.316.925"
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.
Повний текст джерелаDissertation 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.
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.
Повний текст джерелаDissertation 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.
Дривецький, Станіслав Ігорович. "Захист ліній електропередавання з захищеними проводами від наведених блискавкою перенапруг". Thesis, Національний технічний університет "Харківський політехнічний інститут", 2019. http://repository.kpi.kharkov.ua/handle/KhPI-Press/41326.
Повний текст джерелаDissertation for the degree of a candidate of technical sciences in specialty 05.14.02 - Electric power stations, networks and systems. - National Technical University "Kharkiv Polytechnic Institute", Ministry of Education and Science of Ukraine, Kharkiv, 2019. Annotation content. The dissertation is devoted to solving the actual scientific and applied problem in the field of lightning protection of transmission lines with protected wires of middle classes of voltage from the lightning suppressors supplied by lightning strikes near the electric transmission line. The urgency of the topic of the dissertation paper is as follows. At present, protected wiring for PL is gaining widespread in Ukraine, due to the technical policy of the Ministry of Fuel and Energy. Wires in the protective cover for air lines of 6-35 kV were designed to increase the reliability of distribution and transmission of electricity. The use of wires in a protective shell has several significant advantages, namely: reliability, economic feasibility. With obvious advantages, there is a deficiency that is determined by the need to protect the submarine from lightning surges. The concept of lightning protection is so versatile that the methods of choosing suitable protection from threats are different in different regions. The factors that determine the method of protection are the thunder activity and its intensity in each particular region. An analysis of the operation experience of distribution electrical networks shows that their reliability is lower than in the networks of higher voltage classes. Damage in distribution networks causes most of the damage associated with interruptions in consumer electricity supply. One of the main causes of accidents and violations is the storm surges on the air lines (PL), causing impulse overlays and the destruction of insulators and lead to arc closures, with associated equipment damage, trips of lines. Emergency trips of 6-35 kV overhead transmission lines due to lightning surges make up 40% of the total number of trips. Due to low impulse strength, the isolation of distribution networks is subject to overheating both from overvoltages in direct lightning bursts, and from inductive surges when lightning is near the line. The latter are the main cause of the thunderstorms and damage to the equipment of networks 6-35 kV, amounting in some cases up to 90%, and when passing the route of the submarine in the forest area and up to 100% of their total. Thus, the reliability of electricity supply to consumers largely depends on the effectiveness of lightning protection measures.
Гончаров, Євген Вікторович. "Підвищення експлуатаційних показників надпровідникового обмежувача струму короткого замикання індуктивного типу". Thesis, НТУ "ХПІ", 2015. http://repository.kpi.kharkov.ua/handle/KhPI-Press/19828.
Повний текст джерелаThe dissertation for competition of the scientific degree of the candidate of technical sciences on a specialty 05.09.01 – electrical machines and apparatus. – National Technical University "Kharkov Polytechnic Institute", Kharkov, 2016. The dissertation is devoted to theoretical and experimental research aimed to improving operational performance high-temperature superconducting fault current limiter in-inductive type. The developed design of high-temperature superconductive fault current limiter of inductive type with superconducting screen, superconducting coil and the core, which are placed in the general cryostat that provides energy savings up to 85%. The method of calculation of basic parameters of the magnetic system of current limiter, which takes into account the coefficient of the voltage drop. The proposed mathematical models allow us to analyze the current-limiting characteristics with definition of the critical parameters required superconducting current limiter. An experimental investigation was that the power loss in the nominal mode in the core of the superconducting current limiter of inductive type are negligible that is consistent with previous theoretical calculations and confirmed the feasibility and cost-effectiveness of the proposed technical solution. The experimental results confirmed the theoretical position and developed mathematical models.
Гончаров, Євген Вікторович. "Підвищення експлуатаційних показників надпровідникового обмежувача струму короткого замикання індуктивного типу". Thesis, НТУ "ХПІ", 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/19653.
Повний текст джерелаThe dissertation for competition of the scientific degree of the candidate of technical sciences on a specialty 05.09.01 – electrical machines and apparatus. – National Technical University "Kharkov Polytechnic Institute", Kharkov, 2016. The dissertation is devoted to theoretical and experimental research aimed to improving operational performance high-temperature superconducting fault current limiter in-inductive type. The developed design of high-temperature superconductive fault current limiter of inductive type with superconducting screen, superconducting coil and the core, which are placed in the general cryostat that provides energy savings up to 85%. The method of calculation of basic parameters of the magnetic system of current limiter, which takes into account the coefficient of the voltage drop. The proposed mathematical models allow us to analyze the current-limiting characteristics with definition of the critical parameters required superconducting current limiter. An experimental investigation was that the power loss in the nominal mode in the core of the superconducting current limiter of inductive type are negligible that is consistent with previous theoretical calculations and confirmed the feasibility and cost-effectiveness of the proposed technical solution. The experimental results confirmed the theoretical position and developed mathematical models.
Дривецький, Станіслав Ігорович. "Захист ліній електропередавання з захищеними проводами від наведених блискавкою перенапруг". Thesis, Національний технічний університет "Харківський політехнічний інститут", 2019. http://repository.kpi.kharkov.ua/handle/KhPI-Press/41325.
Повний текст джерелаDissertation for the degree of candidate of technical sciences in specialty 05.14.02 - Electric power stations, networks and systems. National Technical University "Kharkiv Polytechnic Institute", Kharkiv, 2019. The thesis is devoted to the solution of an actual scientific and applied problem in the field of lightning protection of overhead power lines with protected wires medium voltage classes from lightning induced overvoltages arising from lightning strikes near a power line. It has been experimentally proved that the lines of electric transmission with protected wires at lightning strikes near the line, pointing at their phase wires, overvoltages are much smaller than the lines of the same class of voltage only with non-insulated wires. This is due to the protective shell of protected wires, since the conditions of an overvoltage which can pierce the garland of insulators are much less likely. Current methods for calculating the number of thunderstorms in the lines of the class of voltage 6-35 kV, do not take into account the type of wire on the PL, which leads to incorrect calculations of the number of thunderstorms and, as a consequence, the number of offsets of the line. The obtained results allowed to create a new approach to lightning protection of PL with protected wires, to create a device for protection of electric lines without the cost of its production and installation. The generated model of the protective device was experimentally tested, no induced overvoltage failed to break the wire isolation.
Глєбов, Олег Юрійович. "Вдосконалення заземлювальних пристроїв електричних підстанцій для забезпечення безаварійної роботи вторинних кіл". Thesis, Національний технічний університет "Харківський політехнічний інститут", 2019. http://repository.kpi.kharkov.ua/handle/KhPI-Press/40844.
Повний текст джерелаThesis for granting the Degree of Candidate of Technical sciences in speciality 05.14.02 – electric stations, networks and systems. – National Technical University "Kharkiv Polytechnic Institute", Kharkiv, 2019. The dissertation is devoted to the improvement of grounding systems of substations with voltage 330 (220) / 150 (110) kV on the criterion of prevention of damage to the insulation of current protection cables with a lightning strike and with short-circuit on the bus of the switchgear of the specified voltage classes. On the basis of the analysis of experimental data obtained at 80 operating substations of Ukraine, independent factors are determined, as well as insignificant from a number of independent ones. On the basis of four- and five-factor experiments, a model was developed to determine the grounding systems resistance. A comparative analysis of the obtained model with known computational methods was carried out. The value of the resistance, determined by the formula of the normative document, for most substations is less than determined by the received model, therefore, is an estimate from below. On the basis of a sixfactor experiment, a model for determining the voltage on the cable insulation of the secondary circuits of the current transformer is obtained, which is the most distant from the relay panels hall, with a short circuit on the bus of the switchgear. In the paper, the procedure for the experimental determination of voltage on cable isolation during simulation of short circuit was developed. In this work a method is developed and examples are given for determination of constructive parameters and material costs of grounding systems with the use of the mathematical models obtained in the work on the criterion of prevention of damage to insulation of secondary circuits with short circuit, and according to the of prevention the false triggering of current protection in the event of damage to the cable insulation.
Глєбов, Олег Юрійович. "Вдосконалення заземлювальних пристроїв електричних підстанцій для забезпечення безаварійної роботи вторинних кіл". Thesis, Національний технічний університет "Харківський політехнічний інститут", 2019. http://repository.kpi.kharkov.ua/handle/KhPI-Press/40840.
Повний текст джерелаThesis for granting the Degree of Candidate of Technical sciences in speciality 05.14.02 – electric stations, networks and systems. – National Technical University "Kharkiv Polytechnic Institute", Kharkiv, 2019. The dissertation is devoted to the improvement of grounding systems of substations with voltage 330 (220) / 150 (110) kV on the criterion of prevention of damage to the insulation of current protection cables with a lightning strike and with short-circuit on the bus of the switchgear of the specified voltage classes. On the basis of the analysis of experimental data obtained at 80 operating substations of Ukraine, independent factors are determined, as well as insignificant from a number of independent ones. On the basis of four- and five-factor experiments, a model was developed to determine the grounding systems resistance. A comparative analysis of the obtained model with known computational methods was carried out. The value of the resistance, determined by the formula of the normative document, for most substations is less than determined by the received model, therefore, is an estimate from below. On the basis of a sixfactor experiment, a model for determining the voltage on the cable insulation of the secondary circuits of the current transformer is obtained, which is the most distant from the relay panels hall, with a short circuit on the bus of the switchgear. In the paper, the procedure for the experimental determination of voltage on cable isolation during simulation of short circuit was developed. In this work a method is developed and examples are given for determination of constructive parameters and material costs of grounding systems with the use of the mathematical models obtained in the work on the criterion of prevention of damage to insulation of secondary circuits with short circuit, and according to the of prevention the false triggering of current protection in the event of damage to the cable insulation.
Руденко, Сергій Сергійович. "Вдосконалення методів контролю та діагностики заземлювальних пристроїв діючих високовольтних енергооб'єктів України". Thesis, НТУ "ХПІ", 2018. http://repository.kpi.kharkov.ua/handle/KhPI-Press/34461.
Повний текст джерелаThesis for granting Candidate of Technical sciences Degree in specialty 05.09.13 – Technics of Strong Electric and Magnetic Fields. – National Technical University "Kharkiv Polytechnic Institute", 2018. The thesis is devoted to the improvement of existing methods of determination of normalized parameters at each of the stages of electromagnetic diagnostics, as well as the creation of a qualitatively new approach to the issuance of recommendations for reconstruction a grounding grids to improve the safety of personnels on energy objects of Ukraine. The statistic of soil electrical properties to evaluate the optimal technical requirements for equipment for vertical electrical soil sounding when performing diagnostics of grounding systems is used. The model of the grounding device was based on the solution of the problem about the electrical field potential of the point current source, located in a three-layer soil. This model allows to determine the field potential at any point in case of the location of the grounding device in any of the layers of soil. Mathematical model and computer program for analyzing and interpreting results of the soil sounding by Wenner configuration was created on the base of the analytical solution for field of current point source located in four-, three- or two-layer structure. The method of equivalenting with bringing the multilayer soil to the form of the calculated models was improved. The adequacy of developed mathematical models for experimental measurements on more than 70 existing high-voltage power facility’s of Ukraine with voltage classes 35-150 kV has been checked. It was proved that the reconstruction of grounding system for requirements of touch voltage both in terms of electrical safety and in terms of material and labor costs is more effectiveness. The parametric model that allows predicting the probable material and technical costs for the reconstruction was created.
Руденко, Сергій Сергійович. "Вдосконалення методів контролю та діагностики заземлювальних пристроїв діючих високовольтних енергооб'єктів України". Thesis, НТУ "ХПІ", 2017. http://repository.kpi.kharkov.ua/handle/KhPI-Press/34463.
Повний текст джерелаThesis for granting Candidate of Technical sciences Degree in specialty 05.09.13 – Technics of Strong Electric and Magnetic Fields. – National Technical University "Kharkiv Polytechnic Institute", 2018. The thesis is devoted to the improvement of existing methods of determination of normalized parameters at each of the stages of electromagnetic diagnostics, as well as the creation of a qualitatively new approach to the issuance of recommendations for reconstruction a grounding grids to improve the safety of personnels on energy objects of Ukraine. The statistic of soil electrical properties to evaluate the optimal technical requirements for equipment for vertical electrical soil sounding when performing diagnostics of grounding systems is used. The model of the grounding device was based on the solution of the problem about the electrical field potential of the point current source, located in a three-layer soil. This model allows to determine the field potential at any point in case of the location of the grounding device in any of the layers of soil. Mathematical model and computer program for analyzing and interpreting results of the soil sounding by Wenner configuration was created on the base of the analytical solution for field of current point source located in four-, three- or two-layer structure. The method of equivalenting with bringing the multilayer soil to the form of the calculated models was improved. The adequacy of developed mathematical models for experimental measurements on more than 70 existing high-voltage power facility’s of Ukraine with voltage classes 35-150 kV has been checked. It was proved that the reconstruction of grounding system for requirements of touch voltage both in terms of electrical safety and in terms of material and labor costs is more effectiveness. The parametric model that allows predicting the probable material and technical costs for the reconstruction was created.