Topic
Magnetic core
About: Magnetic core is a research topic. Over the lifetime, 30011 publications have been published within this topic receiving 155247 citations.
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08 Jan 1996
TL;DR: The power conversion system (PCS) developed by the author is a new technology that efficiently transforms power between AC and DC as mentioned in this paper, which is accomplished using solid state switching devices, capacitors, air-core inductors and an intelligent control system.
Abstract: The power conversion system (PCS) developed by the author is a new technology that efficiently transforms power between AC and DC. The conversion process permits the input voltage level to be stepped up or down without the use of magnetic core transformers. The transformation is accomplished using solid state switching devices, capacitors, air-core inductors and an intelligent control system. The technology is based on the property of resonance charging, thereby permitting the use of self commutating switches. The current through the switches, being sinusoidal in nature, has a low dI/dt. This permits the use of slower, less expensive thyristors, similar to those used in high voltage phase control applications. Using these components, a highly efficient inverter can be constructed for a variety of large utility applications.
104 citations
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TL;DR: In this article, the authors report the technical data and testing results of a 3 phase lab testing model of a 35 kV/100 MVA SFCL and some key design parameters of the 35 kv/100 mVA prototype are presented.
Abstract: We have been carrying out a saturable iron core reactive type superconducting fault current limiter (SFCL) development program since 2002. The major two disadvantages that people used to be foretold for a saturable iron core reactive type SFCL are the massive use of iron (resulting in large size, heavy weight, and high cost) and the high induced voltage hazard to the dc superconducting coil (this may damage the current supply of the dc bias) as a fault takes place. We have found the ways to deal with these two problems, making such kind of equipment reliable and cost effective. In this paper, we will report the technical data and testing results of a 3 phase lab testing model. Some key design parameters of the 35 kV/100 MVA prototype will also be presented.
103 citations
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24 Oct 1991TL;DR: An induction heating device for heating electrically-conducting material to temperatures of up to at least 300°C is described in this paper, where magnetic flux concentrator tubes of electricallyconductive material are disposed about the coil and close to the core embedded in a thermo-conductive electrically insulating material.
Abstract: An induction heating device for heating electrically-conducting material to temperatures of up to at least 300° C. The device comprises an open core of ferrite material. A coil of Litz wire is wound around the core. A power source is connected across the coil to produce an excitation current in the coil, within a frequency range from 12 to 25 kHz, to generate a variable magnetic field when energized. Magnetic flux concentrator tubes of electrically-conductive material are disposed about the coil and close to the core embedded in a thermo-conductive electrically-insulating, material in the intend of maximizing the useful flux. A cooling fluid circulates through the concentrator tubes for cooling the tubes, the core and the coil. An induction zone is defined by said magnetic field generated between the opposed poles of the core and penetrating at the surface of the body to be heated. The body is heated by the eddy currents generated by the variable magnetic field on the surface.
103 citations
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TL;DR: In this article, a magnetic shielding type superconducting fault current limiter is developed in the authors' research on Superconducting Fault Current limiters. But this limiter consists of a copper primary winding, a super-conducting cylinder, an iron core and a control coil.
Abstract: Superconducting fault current limiters for electric power systems have been researched. A magnetic shielding type superconducting fault current limiter is developed in the authors' research on superconducting fault current limiters. This limiter consists of a copper primary winding, a superconducting cylinder, an iron core and a control coil. The superconducting cylinder has a Bi2212 thick film on a MgO substrate. The control coil consists of some metallic rings, and the fault level can be adjusted by changing the number of the rings. To design a prototype limiter, the AC magnetic shielding and loss characteristics of small models were measured. The prototype limiter is 6600 V in rated voltage and 400 A in rated current. The superconducting cylinder is 0.45 m in diameter and about 1 m in height. Only the superconducting cylinder was designed to be cooled by liquid nitrogen. The experimentally manufactured limiter is about 1.3 m in width, about 0.6 m in depth and about 2 m in height.
103 citations
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25 Jul 1994TL;DR: In this paper, an electromagnetic device which includes a magnetic flux producing apparatus for producing magnetic flux path loop is described, where a magnetic core is surrounded by electrical windings and a strip of electrically conductive material is disposed such that it passes through the magnetic path loop and overlies the windings.
Abstract: The present invention discloses an electromagnetic device which includes a magnetic flux producing apparatus for producing a magnetic flux path loop. The magnetic flux producing apparatus preferably comprises a magnetic core 20 surrounded by electrical windings 22. A strip of electrically conductive material 24 is disposed such that it passes through the magnetic flux path loop and overlies the windings 22. The strip 24 has a width which is substantially greater than its thickness. The device may further include an antenna 16 which is electrically coupled to the strip 24.
103 citations