This paper describes a operating characteristics of contactless power transfer (CPT) system from normal conducting coil to HTS based on the electromagnet resonance coupling. The basic principle is that two separate coils with same frequency are possible form resonant high magnetic coupling and exchange energy in efficiency. CPT technique electromagnetic has been expected as useful option for charge storage devices. Since technology using sensitive tune impedance matching, efficiency limited....

This paper deals with fabrication and development of a high temperature superconducting (HTS) fault current limiter (FCL) based on YBCO coated conductor (CC) wire for distribution systems. The capacity the developed HTS FCL is 8.3 MVA its rated voltage 13.2 kV which corresponds to three-phase power equipment class 22.9 kV. Tests prototype were conducted at Korea Electrotechnology Research Institute (KERI) accredited as testing laboratory by Laboratory Accreditation Scheme (KOLAS). A...

Recently super high-speed magnetic levitation (MAGLEV) using high-temperature superconducting (HTS) magnet has been expected as next-generation transportation since can keep mighty force. The at MAGLEV train should be continually charged with high power in order to stronger and stable Practically, conventional supply unit attached HTS the MAGLEV, a large thermal loss is indispensably caused by transfer wires joints, those have one of essential obstacles train. As wireless (WPT) technology...

It is well known that arterial hypoxia can occur with chronic liver disease in adults as children.1-3 The clinical syndrome of association has been called hepatopulmonary (HPS) or intrapulmonary vasodilative disease.3,4 In its classic form, HPS a triad abnormal oxygenation, hepatic dysfunction, and pulmonary vascular dilation. primary underlying the hepatobiliary system mainly cirrhosis other disease.4,5 caused by either right-to-left shunting through arteriovenous connections within lungs...

This paper deals with the current decay characteristics of a high-T <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</sub> superconducting (HTS) coil operated in persistent mode (PCM) under alternating magnetic field. In synchronous machine applications, such as linear motor (LSM), coils are designed to operate PCM obtain steady-magnetic field DC transport current. operates on direct current, but it can be exposed due armature winding. When...

Rotary HTS flux pumps are suitable for cryogenic applications, where it is difficult to implement direct physical connections between the device in question and an external power supply. Here we examine proportional-integral-derivative (PID) control of a rotary pump compensate change current field coil synchronous motor under operating conditions. The must be maintained constant prevent output fluctuation motor. In this context, prototype with rotating tape constructed study. A 600-turn...

Vanadium trioxide (V <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> O xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> ) exhibits a negative temperature dependency in its electrical resistivity, phenomenon known as the metal-to-insulator transition (MIT). This study investigates implications of this property, particularly noting that V 's resistivity significantly decreases above approximately 150K, reaching levels comparable to...

As a part of the 21st Century Frontier R&D Program in Korea being performed from 2004, non-inductive winding type superconducting fault current limiter (SFCL) is developed. The target second year phase II program to develop 220 V/300 A class SFCL as prototype for 13.2 kV/630 class, final goal II. This has three solenoid non-inductively wound coils series using 2G high temperature (HTS) wire and it was tested sub-cooled nitrogen 65 K, 1 atm. coil which composed four parallel windings bobbin...

Since resistive superconducting fault current limiters (SFCLs) are inserted to a power system directly, it is necessary recover instantly after the clearance of fault. Most SFCLs using BSCCO bulk or thick film have recovery time tens seconds. An SFCL YBCO coated conductor (CC) has large surface area contacted liquid nitrogen. Joule heat flux smaller than that other types when occurs. Therefore, important for employing CC investigate time. In this paper, characteristics with respect applied...

This paper deals with design and operating test of a novel hybrid FCL. The FCL system consists coil, fast switch resistor for bypassing the fault current. is driven by non-inductive coil suggested in this but an extra driving required existing We used two kinds HTS wire coil. impedance was negligible normal operation. But different quench characteristics wires caused asymmetric current distribution which induced effective magnetic flux during faults. opened repulsive force from response to...

Contactless power transfer (CPT) technology is an available option to realize the possibility of delivery and storage with connector-free devices across air gap. The CPT system based on a strong resonance coupling, which consists four separate coils same frequency, can possibly exchange energy within 2 m. We propose combination HTS receiver coils, call it superconducting contactless (SUCPT) system. SUCPT technique expected be noble for transferring electric from room temperature very low...

The rotary flux-pump using HTS tape has been studied for superconducting rotating machinery application. charging speed and saturation current of the is closely related to magnetic flux linkage passing through tape. To analyze parameters that effect pumping rate flux-pump, methods changing speed, shape permanent magnet, width tape, intensity have investigated in previous studies [1]- [3]. In this paper, we tried test three cases investigate current: 1) two different background materials,...

Abstract This paper deals with the fabrication and performance testing of a prototype machine for world’s first implementation new type high-temperature superconducting rotating (HTSRM), which is charged operated by application contactless excitation technique rotary-type HTS flux pump based on permanent magnet. Although this has been actively applied in stationary applications, its practical demonstration rotary namely, machines, not yet conducted or reported. Therefore, laboratory-scale...

This paper presents a numerical analysis on MW-class high-temperature superconducting (HTS) synchronous generator, especially focusing damper layer design. Our research program to develop large-scale HTS wind turbine generator (WTG) core technology, two-dimensional electromagnetic FEM model of the direct-drive WTG, comprised 24 air-core type race track coils (24 poles), has been built. The is used for stable operation field coil against varying magnetic by change rotation speed. designed...

A cooling system is an essential part of high-temperature superconducting (HTS) rotating machine manufacturing. Moreover, thermal behavior a crucial parameter the that shows unique characteristics superconductivity below specific temperature to maintain state. Therefore, many experiments have been performed investigate new reliable cryogenic systems for large-scale HTS machine. The motivation study our recent development using trigger switches; it effectively minimizes non-operational...

In general case of DC reactor type superconducting fault current limiter (SFCL), a gradually increases during the fault. It takes above 5 cycles to cut off in existing power system installed conventional circuit breakers (CBs). Therefore, even if SFCL is installed. This paper proposes technique for decaying with function detection and control converter SFCL. Using proposed method, can decay after 1-2 when occurs. To analyze this technique, three-phase 6.6 kV/200 A was fabricated. The has...

This paper deals with analysis of the operational characteristics a resistive non-inductive winding type based superconducting fault current limiter (SFCL) by using YBa <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Cu xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> O xmlns:xlink="http://www.w3.org/1999/xlink">y</sub> (YBCO) coated conductor (CC), and its are analysed through experiments. A SFCL system has solenoid coils wound YBCO...

High Temperature Superconducting (HTS) synchronous motors consist mainly of rotational (HTS coil) and stationery (copper parts. The HTS coil running at a speed is not influenced by the magnetic field generated stator but affected considerably initial or transient operation. Therefore, computational analysis to determine optimal design damper an important factor in protecting motor. This paper presents parameters for 5 MW motor using characteristics current, which proportional alternating coil.

The prototype high-T <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</sub> superconducting electromagnet (HTS-EM) for high-speed EMS Maglev was successfully demonstrated in system up to the vehicle running speed of 500 km/h. EM designed interface with existing propulsion used German Maglev. rating levitation force correspond weight at a 20 mm gap. Electromagnetic forces were simulated and compared test results order verify design feasibility...

A general high-temperature superconducting synchronous motor (HTSSM) is designed and manufactured with an air-core structure, which eliminates the laminated iron core to concentrate linkage flux in conventional rotor stator. In a nonmagnetic material such as glass fiber-reinforced plastic (GFRP) used armature winding supports avoid saturation of magnetic field density stator reduce weight harmonics motor. However, GFRP supporters make heat dissipation difficult due very low thermal...

Objective: Hemodynamic abnormalities and refractory atrial arrhythmias in patients late after the Fontan operation result significant morbidity mortality. We reviewed our experience with conversion concomitant arrythmia surgery. Methods: Between January 1996 February 2004, 16 underwent arrhythmia Mean age at initial was 5.1±3.5 (range: 2–15) years mean 17.0±5.8 6–30). The operations were atriopulmonary connections 14 patients, extracardiac lateral tunnel 1, intracardiac 1. types of included...