Results 261 to 270 of about 124,007 (302)

Quench Characteristic of Superconducting Transformer by Inrush Current

IEEE Transactions on Applied Superconductivity, 2007
As well known, an inrush current of transformer reaches about several times larger than the rated current. When such a large inrush current flows into a superconducting transformer, it will induce a quench of superconducting windings. In this paper, we fabricated a small experimental superconducting transformer, and investigated the behavior of ...
S. Nishimiya, T. Ishigohka, A. Ninomiya, K. Arai   +3 more
openaire   +1 more source

Quench currents of AC superconductor in supercritical helium

IEEE Transactions on Appiled Superconductivity, 1995
Supercritical helium (SHE) is proposed as a coolant for AC superconducting fault current limiters because it provides better electrical insulation than conventional pool-boiling helium. However, the effect of SHE cooling on the current carrying capacity of AC devices is presently unknown.
P.C. Michael, K. Ryu, O. Tsukamoto
openaire   +1 more source

Mechanism of the current quenching phenomenon in pseudospark discharge

20th International Symposium on Discharges and Electrical Insulation in Vacuum, 2003
Experimental data on the current quenching phenomenon in the pseudospark discharge in typical conditions of EUV source operation (extremely short pulse duration and high current) are presented. The mechanism of the phenomenon is proposed.
Yu.D. Korolev, O.B. Frants, V.G. Geyman, R.V. Ivashov, N.V. Landl, I.A. Shemyakin, K. Frank, R. Bischoff, M. Iberler, J. Urban   +9 more
openaire   +1 more source

Methods to increase quench currents of superconducting magnets

Cryogenics, 1996
Abstract Methods to increase quench currents of superconducting magnets and to make them more predictable are discussed. Some of the methods are well known while others are unusual (like that of ‘electrodynamic treatment’). The results of practical implementation of all methods under discussion are presented.
O.P. Anashkin, V.E. Keilin, A.V. Krivykh
openaire   +1 more source

Quench current in conduction-cooled HTS magnets

Superconductor Science and Technology, 2003
The quench current of a superconducting magnet, Iq, is the current at which a thermal runaway occurs. In trained LTS magnets Iq can be estimated from a short sample critical current, Ic, due to a steep electric field (E)–current density (J) characteristic. Anisotropy and the slanted E(J)-characteristic make the situation more complicated in HTS magnets.
Aki Korpela, Jorma Lehtonen, Risto Mikkonen   +2 more
openaire   +1 more source

Study of the quench conditions in superconducting current limiters

IEEE Transactions on Appiled Superconductivity, 2001
A peculiarity of the operation of superconducting current limiters is that the resistance appearing in a superconductor influences the current in the circuit. Using an analytical approach, we analyze the conditions of the normal state formation and return into the superconducting state.
V. Sokolovsky, V. Meerovich, S. Goren, I. Vajda   +3 more
openaire   +1 more source

Optical quenching of lock-on currents in GaAs:Si:Cu switches

Nineteenth IEEE Symposium on Power Modulators, 2002
Infrared quenching of lock-on currents has been demonstrated in a photoconductive GaAs:Si:Cu switch. After quenching of the persistent photocurrent, the current recovers in about 25 ns to a constant value. The persistent photo and dark currents are considered to be due to double injection of carriers through the ohmic contacts of the photoconductive ...
R.A. Roush, M.S. Mazzola, K.H. Schoenbach, V.K. Lakdawala   +3 more
openaire   +1 more source

Quench characteristics of HTS tapes with alternating currents above their critical currents

IEEE Transactions on Appiled Superconductivity, 2003
In this study, the dependence of quench characteristics of HTS tapes on the amplitude of current and duration time was investigated by applying alternating current (AC) that is several times over the critical currents of HTS tapes. When the applied AC/sub peak/ was up to three times of critical current, the joule heat was not cooled down by LN/sub 2 ...
null Seong-Woo Yim, null Hyo-Sang Choi, null Ok-Bae Hyun, null Si-Dole Hwang, null Byoung-Sung Han   +4 more
openaire   +1 more source

Interplay of current crowding and current self-quenching effects in planar cold cathodes

Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures Processing, Measurement, and Phenomena, 2001
In planar cold cathodes making use of semimetallic thin films to achieve low or negative electron affinity, the effects of dc current crowding can be affected by the trapping of electrons being reflected towards the cathode as a result of space-charge effects in the vacuum gap between cathode and anode.
Y. Modukuru, M. Cahay
openaire   +1 more source

Relation between different critical current criteria and quench current in HTS magnets

Physica C: Superconductivity, 2002
Abstract In practice, the critical current of an HTS magnet is the current at which a thermal runaway (quench) occurs. The stability analysis required to determine the quench current, Iq is often a time consuming numerical problem. Usually the short sample critical current, Ic is measured by using some electric field criterion. In trained LTS magnets
A Korpela, T Kalliohaka, J Lehtonen, R Mikkonen, J Pitel, P Kováč   +5 more
openaire   +1 more source