Resistive superconducting fault current limiter

Abstract

A resistive superconducting current limiter, by using a magnetic field generating device separated from the circuit of the power system, the current of the power system cannot flow to the linear coil of the resistive superconducting fault current limiting device when the normal current flows to the power system. It is possible to strengthen the current of the superconducting device, prevent the heat generated on the linear coil, and eliminate the magnetic field generated by the linear coil when the normal current is applied to the power system, and it is possible to use not only the BISCCO-based superconducting device, but also the YBCO-based superconducting device. guide device. The current limiter includes: a superconducting fault current limiting module, which is composed of at least one superconducting fault current limiting device; a magnetic field application unit, which is installed in a circular shape to surround the periphery of the superconducting fault current limiting module, with for applying a magnetic field to the superconducting fault current limiting module; and a current transformer for contactlessly inducing a current converted from a current flowing on a circuit of a power system, thereby applying the induced current to the magnetic field applying unit.

Description

technical field [0001] The present invention relates to superconducting fault current limiters, and in particular to resistive superconducting fault current limiters. Background technique [0002] In power systems including power stations, power transmission lines, substations, and distribution lines used for power generation, transmission, and distribution, fault current limiters (FCLs) are used when short-circuit faults, ground faults, and other fault currents occur. Devices designed to limit mechanical, thermal and electrical stress applied to busbars, insulators, circuit breakers, etc. Because fault currents are continuously increasing and it is difficult to develop power installations that are not affected by fault currents, the demand for fault current limiters is increasing. However, the development of fault current limiters for power systems has been delayed due to technical and commercial difficulties. [0003] Since the discovery of high-temperature superconducto...

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Problems solved by technology

However, the described method cannot solve the following problems: the influence on the stability of the power system; when the current flows to the magnetic field applying unit, induction heat is generated on the coil of the magnetic field applying unit; and the influence of the reactance of the coil of the magnetic field applying unit on the system

Therefore, the efficiency and effectiveness become worse in terms of the size and number of turns of the linear coil

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