ОСОБЛИВОСТІ РОБОТИ НАДПРОВІДНОГО ОБМЕЖУВАЧА СТРУМУ ПРИ РАПТОВОМУ КОРОТКОМУ ЗАМИКАННІ

In the article the fault current limiter of inductive type with high-temperature superconducting coil and screen is considered. Main features of transient at occurrence of short circuit are analyzed.В статье рассмотрен ограничитель тока короткого замыкания индуктивного типа с высокотемпературными сверхпроводящими обмоткой и экраном. Проанализированы основные особенности переходного процесса при возникновении тока короткого замыкания.У статті розглянуто обмежувач струму короткого замикання індуктивного типу з високотемпературними надпровідними обмоткою та екраном. Проаналізовано основні особливості перехідного процесу при виникненні струму короткого замикання

ANALYSIS OF THE OPERATION PECULIARITIES OF THE SUPERCONDUCTING INDUCTIVE CURRENT LIMITER WITH ADDITIONAL SUPERCONDUCTING SCREEN

Purpose. The inductances of magnetic system of a current limiter for the nominal operating mode were determined. The aspects of functioning and a design of a superconducting short-circuit current limiter of inductive type with a superconductive main and additional screens, and superconductive winding, which are placed in a general cryostat on a ferromagnetic core, which ensures an improvement of magnetic field dissipation and in energy efficiency are observed. Methodology. The analysis of distribution of magnetic field of the short-circuit current limiter of inductive type with superconducting high-temperature coil and superconducting main and additional screens, using mathematical modeling by the finite element method in math software package FEMM for different modes of operation is carried out. Results. The calculations of magnetic field dissipation in operational modes are carried out. Originality. The investigations aimed to analyze the influence of distribution of the magnetic field in inductive short-circuit current limiter with superconducting additional screen on its operation modes. First calculation of the distribution of magnetic fields in different modes of operation for the short-circuit current limiter in the area between high-temperature superconducting screens. Practical value. The advantage of additional screen of superconducting short-circuit current limiter is to improve screening from dissipation of the magnetic fields of the magnetic system and reducing the power losses at nominal mode. Using the proposed methodology will identify options acceptable to the current limiter mode of operation

ОСОБЛИВОСТІ РОБОТИ НАДПРОВІДНОГО ОБМЕЖУВАЧА СТРУМУ ПРИ РАПТОВОМУ КОРОТКОМУ ЗАМИКАННІ

In the article the fault current limiter of inductive type with high-temperature superconducting coil and screen is considered. Main features of transient at occurrence of short circuit are analyzed.В статье рассмотрен ограничитель тока короткого замыкания индуктивного типа с высокотемпературными сверхпроводящими обмоткой и экраном. Проанализированы основные особенности переходного процесса при возникновении тока короткого замыкания.У статті розглянуто обмежувач струму короткого замикання індуктивного типу з високотемпературними надпровідними обмоткою та екраном. Проаналізовано основні особливості перехідного процесу при виникненні струму короткого замикання

АНАЛІЗ ОСОБЛИВОСТЕЙ РОБОТИ НАДПРОВІДНОГО ІНДУКТИВНОГО ОБМЕЖУВАЧА СТРУМУ З ДОДАТКОВИМ НАДПРОВІДНИМ ЕКРАНОМ

Purpose. The inductances of magnetic system of a current limiter for the nominal operating mode were determined. The aspects of functioning and a design of a superconducting short-circuit current limiter of inductive type with a superconductive main and additional screens, and superconductive winding, which are placed in a general cryostat on a ferromagnetic core, which ensures an improvement of magnetic field dissipation and in energy efficiency are observed. Methodology. The analysis of distribution of magnetic field of the short-circuit current limiter of inductive type with superconducting high-temperature coil and superconducting main and additional screens, using mathematical modeling by the finite element method in math software package FEMM for different modes of operation is carried out. Results. The calculations of magnetic field dissipation in operational modes are carried out. Originality. The investigations aimed to analyze the influence of distribution of the magnetic field in inductive short-circuit current limiter with superconducting additional screen on its operation modes. First calculation of the distribution of magnetic fields in different modes of operation for the short-circuit current limiter in the area between high-temperature superconducting screens. Practical value. The advantage of additional screen of superconducting short-circuit current limiter is to improve screening from dissipation of the magnetic fields of the magnetic system and reducing the power losses at nominal mode. Using the proposed methodology will identify options acceptable to the current limiter mode of operation.Проведено аналіз режимів роботи та конструктивної схеми надпровідного обмежувача струму короткого замикання індуктивного типу з додатковим надпровідним екраном. Проведено математичне моделювання магнітної системи обмежувача струму методом скінченних елементів у програмному середовищі FEMM. Проведено розрахунок розподілу магнітних полів у різних режимах спрацювання обмежувача струму короткого замикання на ділянці між основним і додатковим екранами, що дозволяє визначити параметри обмежувача струму

АНАЛІЗ ОСОБЛИВОСТЕЙ РОБОТИ НАДПРОВІДНОГО ІНДУКТИВНОГО ОБМЕЖУВАЧА СТРУМУ З ДОДАТКОВИМ НАДПРОВІДНИМ ЕКРАНОМ

Purpose. The inductances of magnetic system of a current limiter for the nominal operating mode were determined. The aspects of functioning and a design of a superconducting short-circuit current limiter of inductive type with a superconductive main and additional screens, and superconductive winding, which are placed in a general cryostat on a ferromagnetic core, which ensures an improvement of magnetic field dissipation and in energy efficiency are observed. Methodology. The analysis of distribution of magnetic field of the short-circuit current limiter of inductive type with superconducting high-temperature coil and superconducting main and additional screens, using mathematical modeling by the finite element method in math software package FEMM for different modes of operation is carried out. Results. The calculations of magnetic field dissipation in operational modes are carried out. Originality. The investigations aimed to analyze the influence of distribution of the magnetic field in inductive short-circuit current limiter with superconducting additional screen on its operation modes. First calculation of the distribution of magnetic fields in different modes of operation for the short-circuit current limiter in the area between high-temperature superconducting screens. Practical value. The advantage of additional screen of superconducting short-circuit current limiter is to improve screening from dissipation of the magnetic fields of the magnetic system and reducing the power losses at nominal mode. Using the proposed methodology will identify options acceptable to the current limiter mode of operation.Проведено аналіз режимів роботи та конструктивної схеми надпровідного обмежувача струму короткого замикання індуктивного типу з додатковим надпровідним екраном. Проведено математичне моделювання магнітної системи обмежувача струму методом скінченних елементів у програмному середовищі FEMM. Проведено розрахунок розподілу магнітних полів у різних режимах спрацювання обмежувача струму короткого замикання на ділянці між основним і додатковим екранами, що дозволяє визначити параметри обмежувача струму

Multilayered ZnO Films of Improved Quality Deposited by Magnetron Sputtering

Multilayered ZnO films were deposited by rf magnetron sputtering on silicon and sapphire substrates. The aim of this work is to improve structural quality of ZnO thin films grown on just listed substrates. Presented X-ray diffraction data testify to remarkable relaxation of compressive stress in two- and three-layered ZnO films in comparison with single-layer one