We present the general principles for the calculation of the parameters for a
current-limiting transformer based on the superconducting–normal state transition in a
superconducting short-circuited winding. The relationships between the parameters
of the magnetic system (core diameter and number of turns in the windings)
and the limited current, losses and temperature in the superconducting element
are investigated. The parameters of a 15 MVA current-limiting transformer are
evaluated. The performance of the superconducting winding in the form of an
HTS hollow cylinder is analysed. The problems of the transition into the normal
state and recovery of the superconducting state in a superconducting cylinder are
discussed.
One promising option for the current limiter is a device based on a fast transition of a superconducting material from the superconducting state with zero resistance to the normal state with pronounced resistance. The superconducting current limiting device being developed by us is based on an idea of inductive coupling of an active high critical temperature superconducting element to the power network We present the results of theoretical investigation of the device's influence on the electromagnetic processes in the circuit to be protected. We have performed a simulation of a 13.8 kV device performance with the use of a mathematical model that takes into account both, electromagnetic and thermal processes in the device. We have introduced the inhomogenities of the ring properties into the model and investigated their influence on the transient characteristics of the device. The basic properties of the current limiter were e x p e r h " J I y investigated using 5 0 V / l U~ and 1000V125A prototypes.
Entangled quantum states are an important element of quantum information techniques. We determine the requirements for states of quadrupolar nuclei with spins >1/2 to be entangled. It was shown that entanglement is achieved at low temperature by applying a magnetic field to a quadrupolar nuclei possess quadrupole moments, which interacts with the electricfield gradient produced by the charge distribution in their surroundings.
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