Complex superconducting fault current limiter

Abstract

The present invention relates to a complex superconducting fault current limiter which adds a current limiting reactor to a superconductor to protect the power line from a fault current, and more particularly, to a complex superconducting fault current limiter using a minimum number of superconducting fault current limiters, while avoiding series and parallel connections of a plurality of superconductors and coils, in order to economically manufacture the fault current limiter in a small size. A superconductor, a high speed switch, and a circuit breaker are connected in series to each other, and a first reactor with a low impedance and a second reactor with a high impedance are connected in parallel to the power line so as to provide a branch circuit for the current to the series circuit. A semiconductor switch is connected in parallel to the second reactor with a high impedance in accordance with the opening high speed switch. A circuit is breaker trip drive controller is configured so as to be connected to the superconductor and the branch circuit, and when a fault current occurs, the fault current is branched into the branch circuit, so that the second reactor limits the fault current. When a fault current occurs, the circuit breaker trip drive controller provides a trip drive signal to the circuit breaker for tripping in accordance with the voltage of the superconductor or the current of the branch circuit.

Description

technical field [0001] The present invention relates to superconducting fault current limiters capable of effectively limiting fault currents occurring on power systems by using superconductors, and more particularly to composite superconducting fault current limiters capable of Connect high-speed switches, semiconductor switches, and reactors in superconductors to minimize the time that superconductors withstand large currents and high voltages when fault currents occur, so as to economically manufacture small fault current limiters. Background technique [0002] Superconductors rarely resist the current flowing on the power line until the current reaches a predetermined threshold current, but when the current exceeds the threshold current, the resistance increases sharply. Because of this property, superconductors can act as fault current limiting elements that limit fault currents in power systems, such as short circuit currents. [0003] Typically, superconducting fault...

AI Technical Summary

Problems solved by technology

Therefore, when manufacturing defects and poor performance are found in the process of manufacturing or operating a superconductor, the superconductor is damaged and thus likely to cause failure of the superconducting fault current limiter

In other words, a localized failure of a superconductor could seriously affect the overall operation of a superconducting fault current limiter, which would lead to unstable reliability

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