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Full-Text Articles in Engineering
Development And Performance Analysis Of A Saturated Core High Temperature Superconducting Fault Current Limiter, Jeffrey W. Moscrop, Scott Hopkins
Development And Performance Analysis Of A Saturated Core High Temperature Superconducting Fault Current Limiter, Jeffrey W. Moscrop, Scott Hopkins
Faculty of Engineering - Papers (Archive)
Recent international activity in the field of high voltage Fault Current Limiters (FCLs) has intensified since the North American blackout of 2003. A number of national and international peak body groups in the USA, Europe and Japan have been established to assess the need for FCLs and the issues associated with their design, specification, operation, protection and integration into the electricity grids. This paper details the development of a prototype 3-phase saturated core High Temperature Superconducting (HTS) FCL in Australia. Through experimental analysis, the performance of this device is characterised in terms of DC saturation, steady state performance, and fault …
Design And Development Of A 3-Phase Saturated Core High Temperature Superconducting Fault Current Limiter, Jeffrey W. Moscrop, Frank Darmann
Design And Development Of A 3-Phase Saturated Core High Temperature Superconducting Fault Current Limiter, Jeffrey W. Moscrop, Frank Darmann
Faculty of Engineering - Papers (Archive)
The occurrence of fault currents and system sensitivity to fault currents are both increasing in modern power systems. Along with extensive damage to network hardware, considerable consumer losses (due to network unavailability) can result from fault current events. One device that is designed to reduce the impact of fault currents and increase network availability is the fault current limiter (FCL). This paper describes the design and development of a 3-phase saturated core high temperature superconducting (HTS) FCL. This particular type of FCL exhibits negligible power losses during the un-faulted state and also provides instantaneous reaction and recovery during fault events. …
Quantitative Description Of Critical Current Density In Ybco Films And Multilayers, Alexey V. Pan, Serhiy Pysarenko, S X. Dou
Quantitative Description Of Critical Current Density In Ybco Films And Multilayers, Alexey V. Pan, Serhiy Pysarenko, S X. Dou
Faculty of Engineering - Papers (Archive)
The vortex pinning model based on the presence of the large number of edge dislocations in high quality YBa2Cu3O7 (YBCO) films and multilayers has been refined. By introducing the pinning potential of a chain of individual edge dislocations, we have been able not only to describe the critical current density dependence on the applied magnetic field over its entire range, but also to extract the microstructural parameters in the films, such as inter-dislocation spacing and average domain size, without employing sophisticated microstructural analysis. The model applicability and its results have been verified with the help …
Stretching Induced Hall Current And Conductance Anisotropy In Graphene, A R Wright, Chao Zhang
Stretching Induced Hall Current And Conductance Anisotropy In Graphene, A R Wright, Chao Zhang
Faculty of Engineering - Papers (Archive)
We evaluate the effect of stretching on the optical conductance of a single layer graphene sheet. It is found that the low energy (Dirac regime) isotropy that leads to the `universal conductance' is lost. More significantly, due to the loss of C_3 symmetry, a non-zero Hall conductance emerges for stretching along chiral directions, reaching a maximum at a stretching angle of 45 degrees, and being as high a S_0 = e2/4h at van Hove singular point for bond angle changes of about 2 degrees.
A Comparative Study On Field, Temperature, And Strain Dependences Of The Critical Current For Doped And Undoped Mgb2 Wires Based On The Percolation Model, Sangjun Oh, Jung Ho Kim, Kyuhwan Cho, Chulhee Lee, Chan-Joong Kim, S. X. Dou, M Rindfleisch, Mike Tomsic, Jung-Ho Ahn
A Comparative Study On Field, Temperature, And Strain Dependences Of The Critical Current For Doped And Undoped Mgb2 Wires Based On The Percolation Model, Sangjun Oh, Jung Ho Kim, Kyuhwan Cho, Chulhee Lee, Chan-Joong Kim, S. X. Dou, M Rindfleisch, Mike Tomsic, Jung-Ho Ahn
Faculty of Engineering - Papers (Archive)
Field, temperature, and strain dependences of the critical current for a SiC doped multifilamentary in situ MgB2 wire have been studied. Measurement results were compared with that of the undoped wire, and the origin of the difference in the critical current is discussed. The critical current can be calculated with the percolation model considering the effect of anisotropy. The temperature dependence of the fitting parameters, the upper critical field along the ab-plane, and c-axis is compared with the dirty-limit two-gap theory. To assess the validity of the fitting parameters, resistive transition has been measured especially to …
A Correlation Between Transport Current Density And Grain Connectivity In Mgb2/Fe Wire Made From Ball-Milled Boron, X Xu, J H. Kim, S X. Dou, S Choi, J H. Lee, H W. Park, M Rindfleish, M Tomsic
A Correlation Between Transport Current Density And Grain Connectivity In Mgb2/Fe Wire Made From Ball-Milled Boron, X Xu, J H. Kim, S X. Dou, S Choi, J H. Lee, H W. Park, M Rindfleish, M Tomsic
Faculty of Engineering - Papers (Archive)
Studies of the magnetic field dependence of the transport critical current density (Jct) and the grain connectivity of MgB2/Fe wires fabricated from ball-milled boron have been conducted in detail, and strong correlations have been found, as evidenced by differences in grain size, critical transition temperature, and resistivity. It was observed that the samples fabricated by ball milling had relatively small grain sizes, resulting in a strong field dependence of the Jct in the high field region. On the other hand, the ball-milled boron was associated with poor connectivity between adjacent grains. It is clearly …