Abstract
In this paper, a bridge type superconducting fault current limiter (SFCL) with a single high-temperature superconducting (HTSC) element is proposed to allow fault current limiting operation in direct current (DC) conditions. First, the principle of operation of the bridge type SFCL with a single HTSC element using flux-coupling was presented. After the fault occurrence, the fault current limiting operation and voltage characteristics, the power load characteristics of each device, and the energy consumption of the two coils and the HTSC element were analyzed in the proposed SFCL. As a result, it is confirmed that in the case of the additive polarity winding, the power consumption and the energy consumption of the HTSC element were lower than those in the subtractive polarity winding, and the fault current limiting characteristics were excellent.
Highlights
Today, power distribution facilities in low-voltage systems utilize a switching arc function to control fault current
4 shows the fault current limiting characteristics and and voltage waveforms of a bridge typetype a single element using flux-coupling when the two windings are connected to the withwith a single element using flux-coupling when the two windings are connected to the subtractive polarity winding the additive polarity winding at input the input voltage source ofV40 subtractive polarity winding and and the additive polarity winding at the voltage source of 40
The fault current limiting characteristics, instantaneous power, and energy consumption of a bridge type superconducting fault current limiter (SFCL) with a single high-temperature superconducting (HTSC) element were compared according to the wiring direction between the two coils during the fault period
Summary
Power distribution facilities in low-voltage systems utilize a switching arc function to control fault current. The fault current does not increase rapidly due to the inductance of the coil, but gradually increases, so that even if a short circuit accident occurs, it does not significantly affect the system at the beginning In this way, the system can be protected when the circuit break (CB) is operated in a situation where the current is not increased to disconnect the circuit from the power supply. A bridge type SFCL applied with a thyristor or an insulated gate bipolar transistor (IGBT) switch instead of a diode, and a DC resistance type in which a superconducting coil capable of being quenched is added to the diode bridge has been proposed [14–25]. When the connection direction between the two coils was different during the fault cycle, the fault current limiting operation due to the quench of a single HTSC element, the voltage characteristics of each element, the magnetic flux and instantaneous power of two windings, and the energy consumption were compared with each other
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