Abstract
In this paper, the fault current limiting (FCL) characteristics of a flux-coupled type superconducting fault current limiter (SFCL) with parallel connection between two windings in a DC system were analyzed. The flux-coupled type SFCL was composed of two coils connected in parallel and a superconducting element (SE), which was connected in series with the secondary coil. The flux-coupled type SFCL works in DC systems similar to those in AC systems. Before a fault occurs, the respective magnetic fluxes generated by the two coils connected in parallel offset each other, maintaining the voltage induced in the two coils at zero. In case of a fault, however, resistance is generated in the SE, preventing the magnetic fluxes generated by the two coils from offsetting each other. Thus, some voltage is induced in the two coils, and this starts to limit the fault current. DC short circuit tests were conducted, and the test results confirmed that the flux-coupled type SFCL with the two parallel connected coils was effective in limiting the fault current in a DC system. Additionally, the effect of the wiring direction of the two coils on the SFCL’s FCL performance and operating current, limiting impedance, and instantaneous power load was further analyzed, and as a result, the performance conditions of the SFCL in a DC system were determined.
Highlights
Accepted: 17 February 2021The fault current of the system has inevitably increased due to the increase of power generation sources to respond to power demand and the system looping for reliable power supply
Paper,aaprototype prototypeflux-coupled flux-coupled type with two coils connected paralislelproposed as a device to limit
An experimental device is proposed as a device to alimit a DCcurrent fault current a DC system
Summary
The fault current of the system has inevitably increased due to the increase of power generation sources to respond to power demand and the system looping for reliable power supply. A hybrid circuit breaker (HCB) is designed to have a mechanical highspeed switch in the conduction path and power semiconductor switch in the commutation path This design reduces conduction losses under normal conditions, and quickly cuts off fault currents when an accident occurs in the DC system. Using the intrinsic rapid quenching nature of superconductors, when a short circuit accident occurs, SFCLs can distribute the fault current in a timely and proper manner and reduce it quickly and efficiently [21,22]. There is a difference from this work in that the superconducting coil is used for the flux-coupling type SFCL and that it is applied to the shipboard MVDC. A flux-coupled type SFCL was employed to reduce the effect of DC short circuit accidents in DC systems. The FCL performance and instantaneous power loss characteristics of the SE for each condition were compared and analyzed
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