Development of the superconducting transformer is arguably the most difficult of the ac power applications of superconductivity - this is because of the need for very low ac losses, adequate fault and surge performance, and the rigors of the application e...

... the powers which are maximum under the conditions of retaining the superconducting state and of the steady-state stability of power transmission ...

In order to apply widely the superconductivity technology to electric power equipments, the development and evaluation on the AC superconducting cables have been conducted in the Central Research Institute of Electric Power Industry. The superconducting c...

A superconduction power storage apparatus includes a superconduction coil for storage and release of electrical energy, and a separately excited thyristor conversion unit having d.c. terminals connected to the said superconduction coil and a.c. terminals connected to an ...

... was developed and implemented to study these discharges under conditions found in proposed ac superconducting power-transmission lines. ...

... Abstract : Test measurements on polymer insulation materials for Brookhaven National Laboratory's (BNL's) ac superconducting power ...

... ALTERNATORS, USSR, ARMATURES, TRANSLATIONS, MAGNETS, ELECTRIC GENERATORS, ELECTRIC COILS, CRYOSTATS. ...

Work reported is on the development of a 30 MJ superconducting magnetic energy storage (SMES) unit for use by the Bonneville Power Administration (BPA) to stabilize power oscillations on their Pacific AC Intertie. The 30 MJ superconducting coil manufactur...

A superconducting magnetic energy storage coil connected in parallel between converters of two or more ac power systems provides load leveling and stability improvement to any or all of the ac systems. Control is provided to direct the charging and independently the discharging of the ...

The 30-MJ superconducting magnetic-energy-storage (SMES) system was devised as an alternate means to modulate the Bonneville Power Administration (BPA) Pacific AC Intertie, a part of the Western US Power System, to prevent undamped power oscillations at 0...

The patent application describes a high power density, low frequency superconducting transducer which includes an electro-dynamic drive wherein a superconducting magnet provides the primary driving force for two AC-driven copper coils. Each of the copper ...

... Title : Superconducting Electric Machines for Ship Propulsion. ... superconducting AC machine concepts were ... MIT on superconducting AC machines. ...

The objective of the program was to study the feasibility of Nb3Ge being used as an AC superconducting power transmission cable material. Specifically, the program was to measure AC losses in available samples of Nb3Ge and find under what conditions the l...

Development of the superconducting transformer is arguably the most difficult of the ac power applications of superconductivity - this is because of the need for very low ac losses, adequate fault and surge performance, and the rigors of the application environment. This paper briefly ...

This paper presents the results of theoretical and experimental development of a new dc-ac-dc converter for superconducting magnet power supplies. The basic operating principles of the circuit are described followed by a theoretical treatment of the dynam...

The design and testing of a cryogenic bushing for the termination of a 138 kV 3-phase superconducting power transmission line are discussed. Three combined voltage and current bushings have been tested. Vacuum leaks and refrigerator capacity have limited ...

The purpose of the work was the creation of an electrical generator with a superconducting inductor with 100 kW power for verification of the work capacity and effectiveness of the basic structural units. In addition, interest was shown in a comparison of...

This paper presents the preliminary design of poloidal field power supply system of HT-7U super-conducting tokamak. With an emphasis on AC/DC power converter, DC circuit breaker, quench protection, harmonic suppression and static var. compensation, and AC power system, the ...

The winding technology with high current capacity is one of the important factors in power application of 20 MVA/66 kV-class superconducting power transformers. High-current power transformer is achieved by transposed conductors made of Rare Earth-based superconducting coated conductors. By ...

The patent application describes a high power density, low frequency superconducting transducer which includes an electro-dynamic drive wherein a superconducting magnet provides the primary driving force for two ac-driven copper coils. Each of the copper coils is rigidly attached to a corresponding movable piston. ...

The SSC collider is designed to have circumference of 87 km. The superconducting magnets along the collider ring are grouped into ten sectors. Each sector, a string of average length of 8.7 km,m is powered by one power source located near the center of the sector. Because of the alternating-current (ac) electrical ...

In the opinion of EPRI and ERDA this 46 month program to develop an ac super-conducting power transmission line was unsuccessful in meeting most of its specific objectives. The technical and economic problems pursued are outlined. Unforeseen difficulties ...

New dielectric tapes were developed for a superconducting, flexible, ac power cable. Preliminary aging tests were performed. Tests show that the proposed system withstood frequency accelerated aging at a cable stress of 10 MV/m for an equivalent 60 Hz tim...

The development of a suitable polymeric tape for use as insulation on ac superconducting cables is a challenging engineering problem for the designer of plastic films. No commercially available tape simultaneously fulfills all of the electrical, mechanica...

The EPR instrument includes an X band klystron used to generate microwave power that is transmitted to a superconductive waveguide cavity resonator. The cavity is placed between the pole pieces of a large d-c magnet and small a-c magnetic coils energized ...

The characteristics and economics of superconducting power transmission cables are described. At present Austria is the only European country continuing this research. The USSR has an active program and U.S. efforts are concentrated at the Brookhaven Laboratory which is constructing a 100 m long 138 kV test facility.

The nonlinear diffusion of magnetic flux into a superconducting sample can be studied by measuring the relaxation of the magnetisation after application of a step field or by measuring the ac susceptibility, (chi)(sub 1) and its third harmonic, (chi)(sub ...

The present invention is for a compact superconducting power transmission cable operating at distribution level voltages. The superconducting cable is a conductor with a number of tapes assembled into a subconductor. These conductors are then mounted co-planarly in an elongated dielectric to produce a 3-phase cable. The arrangement ...

The following appendices to a final research report on a proposed superconducting cable system for ac power transmission are included: technical background of the cryogenic envelope and refrigeration system; method for calculating envelope heat leak; construction procedures and costs for the installation of ...

The ac free-electron laser (ac FEL) uses an ac (temporally oscillating but spatially uniform) field as the pump source with the hope that electromagnetic radiation will be produced with wavelength shorter than that can be generated by a conventional magnet FEL. The ac field can be provided by a ...

Work reported is on the development of a 30 MJ superconducting magnetic energy storage (SMES) unit for use by the Bonneville Power Administration (BPA) to stabilize power oscillations on their Pacific AC Intertie. The 30 MJ superconducting coil manufacture was completed. Design of the seismic ...

This paper proposes a new magnetic levitation scheme which is able to generate levitation force for all speeds including a standstill. Auxiliary wheels which are needed in EDS MAGLEV vehicle can be eliminated. This scheme uses AC superconducting magnets to generate levitation force. In this paper, magnetic fields, forces and power ...

Projects with large offshore wind farms (up to 500 MW) are in progress. Connecting the parks to the power grid with conventional AC transmission technique is difficult due to non-controllable power flow and voltage stability problems. A new concept for connecting remotely located wind farms is suggested and described. The concept is ...

The possibility of employing superconductors for the field windings of large AC generators, providing essentially unlimited field capability and eliminating field ohmic losses is discussed. Some of the benefits and challenges in reducing this exctting new technology to practice in large AC generators are outlined. The discussion was directed ...

We have manufactured a small circular superconducting coil impregnated with epoxy fibreglass. The coil was wound from a Bi-2223/Ag superconducting wire and it was tested in liquid nitrogen at 77 K. Current-voltage characteristic and the AC losses of the coil were measured and compared with the measurements on the original tape. The ...

... Title : AC LOSSES OF SUPERCONDUCTING COMPOSITES WITH 8 MU-M NBTI FILAMENTS IN A DC MAGNETIC FIELD WITH A ...

... are superconducting. The design of such a machine is dominated by the AC losses which occur in the armature. Most superconducting ...

A 30 MJ superconducting magnetic energy storage (SMES) system was designed and developed for application in the Western US Power System to damp power oscillations that limit high voltage ac transmission. The system is in place at the Bonneville Power Administration (BPA) Tacoma Substation and ...

An inductor-converter bridge (ICB) is a solid state DC-AC-DC power converter system for bidirectional, controllable, energy transfer between two coils. The ICB is suitable for supplying large pulsed power to such magnets as the superconducting equilibrium field coil of the proposed tokamak ...

The successful application of superconductivity to motors and other power system components depends on the characterization and subsequent minimization of the ac loss in the superconductor used for fabrication of the component. The superconductive component, excited by an ac ...

The makeup of a superconducting three-phase ac cable with coaxial eonductor pairs is described. Thermal insulation can be ensured by means of techniques already used in the construction of containers for liquids with low boiling points. Suitable superconductor materials are niobium and niobium--tin. The most effective electric insulation is ...

The general characteristics of dc superconducting cables as well as details of two specific designs, one coaxial and the other double monopolar, are discussed. The special advantages of these cables lie in the relative simplicity of construction, their extremely high operating efficiency, and their compactness when compared with other ac or dc ...

If a through fault causes overheating of a superconducting cable, the cable cannot be used until the normal operating temperature is re-established. Since this could take more than a day, the cable must be designed so that the largest through fault expected will not overheat the cable system. A description is given of: (1) a theoretical analysis of the behavior of a ...

A small-scale Superconducting Magnetic Energy Storage (SMES) unit was constructed using small magnets and a high-voltage converter, and the characteristics of this unit were examined. The high output voltage of the converter makes it possible for even a small magnet to charge and discharge large power. Moreover, converter control provides adequate ...

With the extensive application of DC power systems, suppression of DC fault current is an important subject that guarantees system security. This paper presents an active superconducting DC fault current limiter (DC-SFCL) based on flux compensation. The DC-SFCL is composed of two superconducting windings wound on a single iron core, ...

This paper presents the results of theoretical and experimental development of a new dc-ac-dc converter for superconducting magnet power supplies. The basic operating principles of the circuit are described followed by a theoretical treatment of the dynamics and control of the system. The successful results of the first experimental ...

The design of a superconducting magnetic energy storage coil is presented. The purpose of this coil is to stabilize low frequency power oscillations in long high voltage ac power lines. The practical application for this specific coil will be the installation in the Pacific intertie between Washington State and Los ...

Results are presented of experiments aimed at developing advanced, high-capacity, power transmission conductors using superconducting materials derived from Nb/sub 3/Ge. Successful efforts for producing a model superconducting (Nb/sub 3/Sn) joint for use in superconducting lines are described. Realistic theoretical ...

This work focuses on the development of high power density generators for airborne applications by bridging the chasm between generator and high temperature superconducting (HTS) wire developmental efforts. Benefits of HTS power generation include improved efficiency, thermal management reduction, improved power ...

We investigate the AC loss of a high-0953-2048/10/8/004/img2 superconducting power-cable conductor with four layers and interlayer insulation. The electric-circuit model is applied for the calculation of the AC loss of the conductor. The result of a calculation for the AC loss shows that the ...

... FOR A SUPERCONDUCTING, ROTATING, ELECTRIC GENERATOR. ... Descriptors : *ELECTRIC POWER ... SUPERCONDUCTIVITY, GENERATORS, ...

The 30 MJ, 10 MW superconducting magnetic energy storage (SMES) system was devised to interact in the Western U.S. Power System as an alternate means to damp unstable oscillations at 0.35 Hz on the Pacific HVAC Intertie. The SMES unit was installed at the Tacoma Substation of the Bonneville Power Administration (BPA). The operating ...

The behavior of a high current, low voltage dc system is studied. The dc system is made up of superconducting cables connected in a meshed configuration. The system could be made up of several large rectifiers feeding hundreds of small inverters connected to points in one or more ac systems. A unique aspect of this superconducting ...

A simple way to obtain true ac losses with a resonant circuit containing a superconductor, using the decay of the circuit current, is described. For the measurement a capacitor is short circuited with a superconducting cable. Energy in the circuit is provided by either charging up the capacitors with a certain voltage, or letting a dc flow in the ...

Progress in the development of dc superconducting cables suggests these systems will provide an attractive alternate among cable options where long lengths of high-capacity underground transmission lines are required. The general characteristics of dc superconducting cables as well as details of two specific designs, one coaxial and the other double ...

The merits of hvdc and uhv ac transmission systems were discussed at an international conference of Electrical Engineers in London, Nov. 1973. Environmental aspects are discussed in relation to increased power-transmission ratings. Within the next decades, power generation will be concentrated in huge blocks of ...

An electric motor using thyristor switches to allow connection to an ac supply voltage is described. The thyristor switching is accomplished in part, by the use of a sensor which notes and uses relative positions of the magnetic fields of the armature and of the field to change the gate voltage applied to the thyristor and, in part, by the ac system ...

The design of a shield winding to be placed around a superconductive magnet is discussed. By operating the shield and main winding in parallel, it is possible to transfer energy to and from the magnet system without exposing the superconductive coil to a changing field, thereby eliminating ac losses in the superconductor and ...

The design philosophy and the operating behavior of a 5.5 kA, +-2.5 kV converter, being the electrical interface between a high voltage transmission system and a 30 MJ superconducting coil, are documented in this paper. Converter short circuit tests, load tests under various control conditions, dc breaker tests for magnet current interruption, and converter failure modes are ...

The experimental studies performed under this contract comprised investigation of two principal approaches to achieving very low levels of ac loss in Nb sub 3 Sn produced by the liquid diffusion process. These approaches were inhibition of the formation o...

A calorimeter for measuring ac losses in meter-long lengths of HTS superconducting power transmission line cables is described. The calorimeter, which is based on a temperature difference technique, has a precision of 1 mW and measures single, two-phase (coupling), and three-phase losses. The measurements show significant coupling ...

Superconductors with inhomogeneous or filamentary structures are able to carry current distributed right across their cross sections. Because of flux- trapping properties, the form of current distribution will in general depend on the previous history of the specimen and, if a-c are carried, hysteresis in the current distribution is to be expected. This is equivalent ...

Several superconducting AC machine concepts were studied for ship propulsion applications. These concepts evolved from previous work at MIT on superconducting AC machines. The superconducting machines considered were: (1) multipole, low-speed motors, (2) ...

A 30 MJ (8.4 kWh) Superconducting Magnetic Energy Storage (SMES) unit with a 10 MW converter was installed and commissioned at the Bonneville Power Administration (BPA) substation in Tacoma, Washington. This is the first large-scale application in the US of superconductivity in an electric utility system. The unit, which is capable of ...

The objective of this project is to conduct joint research and development activities related to certain electric power applications of high-temperature superconductivity (HTS). The new superconductors may allow development of an energy-efficient switch to control current to variable speed motors, superconducting magnetic energy ...

Loads with pulse durations greater than several milliseconds are considered. The employed systems utilize a superconductive inductor as a means of energy storage. The charging characteristics of the inductive, pulsed power load are examined and a description is provided of different schemes for interfacing the pulsed load with the storage inductor, taking ...

ABS>Research is being conducted at Brookhaven National Laboratory to develop a superconducting ac cable system leading to the construction of a 1/2 mile model cable of 200 MVA capacity at Brookhaven and a cable of larger (>2000 MVA) capacity for test at a utility testing site. It is a coaxial cable of flexible design using Nb/sub 3/Sn ...

This book presents the papers given at a conference on electric equipment. Topics considered at the conference included inverters, microprocessor control, nonlinear torque control of electric motor drives, MOSFETs, battery discharge regulators, the asymmetrical gating of power converters for superconducting energy storage, ac-to-dc ...

... external connections to the superconducting transformer. Descriptors : *PATENTS, *POWER TRANSFORMERS, ELECTROMAGNETIC SHIELDING ...

The paper considers the choice of conductors and dielectrics for both ac and dc superconducting power transmission cables. The use of Nb3Sn, NbTi and Nb3Ge as the superconductors in ac cables is examined as is the use of pure niobium and specially treated Nb3Sn in three-phase ac cables. The ...

This paper investigates the electromagnetic properties of high-temperature superconductors with a particular focus on the AC loss in coils made from YBCO superconductors. The numerical analysis and finite element modelling of the YBCO superconductors used in Cambridge�s superconducting permanent magnet synchronous motor currently in development is ...

The influence of an ac current of arbitrary amplitude and frequency on the mixed-state dc-voltage-ac-drive ratchet response of a superconducting film with a dc current-tilted uniaxial cosine pinning potential at finite temperature is theoretically investigated. The results are obtained in the single-vortex approximation, i.e., for ...

Sep 3, 2010 ... SUBTOPIC TITLE: Power Management and Storage. PROPOSAL TITLE: Efficient Lightweight AC-AC Power Control for Solar UAV ...

As an integral effort in the Argonne Tokamak Experimental Power Reactor Conceptual Design, the conceptual design of a 10-tesla, pure-tension superconducting toroidal-field (TF) coil system has been developed in sufficient detail to define a realistic design for the TF coil system that could be built based upon the current state of technology with minimum ...

A Superconducting Magnetic Energy Storage (SMES) system is being developed at the Los Alamos Scientific Laboratory (LASL) for a dynamic stabilizer to be installed in the Bonneville Power Administration (BPA) power system at Tacoma, Washington, by 1982. This unit will be an alternate stabilization method to the dc modulator now used to ...

Attention has been focused recently on superconducting tape conductors because of the possibility of using them in flexible superconducting ac and dc cables and because of the development of the technology of fabricating multifilament tape superconductors...

Electric power systems that have major loads and generation centers separated by large distances may experience low-frequency power oscillations. This type of oscillation has occurred on the Pacific ac intertie that connects southern California and the Pacific Northwest. A separate, almost parallel, dc-transmission line also connects ...

Superconducting transmission cables are important for increasing the capability of electricity networks. We analysed monolayer power transmission cable based on high-temperature superconductors, and we propose a new way to improve its performance in this paper. We studied two important parameters of this cable�critical current and AC ...

To consider the characteristics of SMES and to investigate problems on the operations of SMES in power systems, we carried out some experiments on an experimental network. In the network, a small superconducting magnet is connected to a small synchronous generator through a double thyristorized converter and transformers. The generator is connected to the ...

A noval ac superconducting cable is described. It consists of a composite structure having a superconducting surface along with a high thermally conductive material wherein the superconducting surface has the desired physical properties, geometrical shape and surface finish produced by the steps of depositing a ...

A novel ac superconducting article is described comprising a composite structure having a superconducting surface along with a high thermally conductive material. The superconducting surface has the desired physical properties, geometrical shape and surface finish produced by the steps of depositing a ...

A novel ac superconducting article is described comprising a composite structure having a superconducting surface along with a high thermally conductive material wherein the superconducting surface has the desired physical properties, geometrical shape and surface finish produced by the steps of depositing a ...

A large amount of power (5 GW or more) can be transmitted through a dc superconducting power transmission line (SPTL) which has the highest power density and efficiency of any known transmission line. Although the SPTL has zero resistance to pure dc, it experiences hysteresis and resistive losses under ...

Recently proposed synchrotrons, SF-SPS at CERN and DSF-MR at Fermilab, would operate with a 0.5 Hz cycle (or 2 second time period) while accelerating protons to 480 GeV. We examine possibilities of superconducting magnet technology that would allow for an accelerator quality magnetic field sweep of 2 T/s. For superconducting magnets the cryogenic cooling ...

For near-future applications of REBa2Cu3O7 (REBCO) coated conductors to electric power cables, transformers and Superconducting Magnetic Energy Storage (SMES), the long taped wires with high performance in the transport properties have been designed and fabricated. Moreover, in order to drastically reduce AC losses in perpendicular ...

A two-dimensional numerical diffusion model which estimates self-field ac losses in High-Tc Superconducting (HTS) tapes is developed. The HTS tape is simulated as a nonlinear conductor whose equivalent resistivity is derived from a power law E-J characteristic. Results of various field quantities and ac losses for ...

As a candidate for a low ac-loss bulk power transmission cable, a high-{ital T}{sub {ital c}} superconducting wire in a flux-flow state, which is called a {ital flux}-{ital flow} {ital superconductor} here, is theoretically studied. The electrodynamics of such a wire in a self-excited ac field is formulated, where ...

Reducing AC loss in a superconducting apparatus is one of the most important issues, and the precise measurement and estimation of AC losses are essential to reduce them. The four-terminal method is universally used as an electric measurement method of AC losses for superconducting tapes and ...

The authors report single-phase ac loss measurements on 8, 4, and 3-layer, multi-strand, HTS prototype conductors for power transmission lines. They use both calorimetric and electrical techniques. The agreement between the two techniques suggests that the interlayer current distribution in one-meter long conductors are representative of those in long ...

The present paper first proposes a new type of superconducting current limiter comprising a non-inductively wound AC superconducting coil (trigger coil) connected in parallel with a limiting coil. Furthermore, a model electric power system for the application of this type of superconducting ...

A two-phase full-wave superconducting rectifier has been developed as a small cryogenic power supply of superconducting magnets for magnetically levitation trains. Those magnets are operated in the persistent current mode. However, small ohmic loss caused at resistive joints and ac loss induced by the vibration of ...

Electric power systems that have major loads and generation centers separated by large distances may experience low-frequency power oscillations. This type of oscillation has occurred on the Pacific AC Intertie that connects southern California and the Pa...

Superconductors based upon Nb sub 3 Ge have been fabricated by the chemical vapor deposition (CVD) process in long lengths in a configuration suitable for an ac power transmission line. This material exhibits a transition temperature T/sub c/ greater than...

While the performance of YBa{sub 2}Cu{sub 3}O{sub 7-x} (YBCO)-based coated conductors under dc currents has improved significantly in recent years, filamentization is being investigated as a technique to reduce ac loss so that the 2nd generation (2G) high temperature superconducting (HTS) wires can also be utilized in various ac ...

In this paper we investigate the effectiveness of an alternative design scheme to reduce the AC losses in high temperature superconducting (HTS) power transmission cables made of non-ferromagnetic HTS coated conductors. With this design, the adjacent tapes of each layer of the cable overlap each other up to a certain distance from ...

The theory and calculation of a.c. losses in type II superconducting materials and superconducting coils are presented. The calculated losses are compared to loss-measurements in solenoids performed by several laboratories. Methods of loss measurements are described. (author)

Superconducting synchronous generators are being developed world wide. Early results etablished the feasibility of these machines and showed that the best configuration is a rotating superconducting field inside a normally conducting armature in the stator. Extensive analytical development is providing a sound basis for the design of ...

Many alternative energy power generation systems create dc electricity. Also, many devices consume dc converted from ac. Therefore, it may be possible to reduce conversion losses and CO2 emissions by adopting dc distribution. We assume that superconducting cables will be used for dc distribution because their electrical resistance is ...

A superconducting tape having reduced AC losses. The tape has a high temperature superconductor layer that is segmented. Disruptive strips, formed in one of the tape substrate, a buffer layer, and the superconducting layer create parallel discontinuities in the superconducting layer that separate the ...

This dissertation presents the development of new power-conditioning systems for superconducting magnetic energy storage (SMES), which can regulate fast and independently the active and reactive powers demanded in the ac network. Three new power-conditioning systems were developed through a ...

This dissertation presents the development of new power-conditioning systems for superconducting magnetic energy storage (SMES), which can regulate fast and independently the active and reactive powers demanded in the ac network. Three new power-conditioning systems were developed through a ...

The effects of metallurgical processing on 60 Hz ac losses and dc critical currents in Nb/sub 3/Sn tapes fabricated by the solid state diffusion technique were investigated. An addition of Al to the Cu--Sn alloy for the matrix resulted in large reduction in the ac losses of Nb/sub 3/Sn tapes, but the highest linear critical current densities were observed ...

The effects of metallurgical processing on 60 Hz ac losses and dc critical currents in Nb/sub 3/Sn tapes fabricated by the solid state diffusion technique were investigated. An addition to Al to the Cu-Sn alloy for the matrix resulted in large reduction in the ac losses of Nb/sub 3/Sn tapes, but the highest linear critical current densities were observed ...

In particle accelerators quasi-DC superconducting magnets are used to keep particles in desired tracks. The needed rapid field variations of these high energy magnets require large energy bursts. If these bursts are taken from and fed back to the utility grid, its voltage is distorted and the quality of the electricity degrades. In addition, these bursts may decrease operation ...

Future use of coated conductors in electric power applications like transmission cables, transformers or fault current limiters is sensitive to the amount of dissipation in the AC regime. This paper analyses factors controlling AC loss of coated conductors in typical configurations: the self-field case when transport current generates ...

A general review and technology assessment of superconducting magnets for energy storage and superconducting cables for power transmission are presented. It is concluded that the technology is now available for applying superconductivity in the power industry. (TFD)

As an integral effort in the Argonne Experimental Power Reactor design studies, a scoping-study was made on the equilibrium coil system. Various design options were investigated. The reference design is a superconducting equilibrium field coil system located outside the toroidal field coils for reasons of ease of coil assembly, disassembly, coil ...

Work is reported on the development of two superconducting magnetic energy storage units. One is a 30-MJ unit for use by the Bonneville Power Administration to stabilize power oscillations on their Pacific AC Intertie, and the second is a 1- to 10-GWh unit for use as a diurnal load-leveling device. Emphasis has ...

In the opinion of EPRI and ERDA this 46 month program to develop an ac superconducting power transmission line was unsuccessful in meeting most of its specific objectives. The technical and economic problems pursued are outlined. Unforeseen difficulties were encountered with power losses in the superconductor, eddy ...

In the opinion of EPRI and ERDA this 46 month program to develop an ac superconducting power transmission line was unsuccessful in meeting most of its specific objectives. The technical and economic problems pursued are outlined. Unforeseen difficulties were encountered with power losses in the superconductor, eddy ...

The low-field dependence of electrical power absorption and ac susceptibility--temperature measurements are performed on three ceramic superconductors of the Tl{sub 2}Ba{sub 2}Ca{sub {ital L}{minus}1}Cu{sub {ital L}}O{sub 4+2{ital L}} family using modulated and direct microwave and ac methods. Below a critical temperature all samples ...

The low-field dependence of electrical power absorption and ac susceptibility-temperature measurements are performed on three ceramic superconductors of the Tl2Ba2CaL-1CuLO4+2L family using modulated and direct microwave and ac methods. Below a critical temperature all samples exhibit a large increase in ac and ...

... Descriptors : *SUPERCONDUCTIVITY, ELECTRIC POWER PRODUCTION, ELECTRONIC COMMUTATORS, ELECTRIC MOTORS, PINCH ...

... Title : SUPERCONDUCTING ELECTRICAL MACHINERY AS A MEANS OF POWER TRANSMISSION IN AIRCRAFT. Descriptive Note : Final rept.,. ...

... Abstract : This is the final report for the development of a superconducting magnet system for magnetohydrodynamic power generation. ...

... is a bibliography of ... SUPERCONDUCTORS, *BIBLIOGRAPHIES, * SUPERCONDUCTIVITY, POWER ... NIOBIUM ALLOYS, SCIENTIFIC RESEARCH. ...

A superconducting ac power cable has been developed using Nb/Cu/Invar composite conductors and shields in a coaxial configuration with pressurized He at 4.7 K as the primary dielectric. Two major concerns for this cable system were the accommodation of fault currents and the differential thermal expansion between the conductor ...

This paper details several techniques of inductive voltage compensation developed for quench detection in superconducting magnet systems with multiple coils and power supplies, with particular application for the Large Coil Test Facility (LCTF). Sources of noise, their magnitudes, and the sensitivity required for normal zone detection to avoid damage to ...

A study has been made of ac loss characteristics of type-II superconductors due to hysteresis losses in the superconducting material and eddy current losses in the normal matrix in the absence of an applied field. Losses were measured for Nb$sub 3$Sn tapes, a Nb multifilament conductor, and NbTi multifilament and single-core conductors at 60 Hz ...