Abstract
We proposed a superconducting DC circuit breaker that can reliably cut off the fault currents in preparation for the DC system. It consists of a superconducting element and a mechanical DC circuit breaker. The mechanical DC circuit breaker is connected in parallel with a mechanical high-speed switch, an LC divergence oscillation circuit, and a surge arrester. This provides stable cutoff operation due to the fault-current-limiting operation of the superconducting element and the artificial current zero point of the mechanical DC circuit breaker. In this paper, the operating principle of the LC divergence oscillation circuit that creates an artificial current zero point was reviewed based on the theory. We used experimental data to model the time constant of the initial fault current, the arc model generated by the mechanical high-speed switch, and the experimental equipment. As a result, the LC divergence oscillation circuit was confirmed in the simulation, and simulation modeling was reviewed based on the theoretical principle of generation.
Highlights
In many countries, HVDC, MVDC, and LVDC level systems are being operated, with different purposes of use, depending on each system level
We researched a cutoff technology to quickly and safely cut off the fault current that occurs in the transient state, and we proposed a superconducting DC circuit breaker that combines a superconducting element and a mechanical DC circuit breaker
We sought to examine this technique based on theory through PSCAD/EMTDC simulation
Summary
HVDC, MVDC, and LVDC level systems are being operated, with different purposes of use, depending on each system level. Unlike AC, DC fault current does not have a cutting-off zero point; there is difficulty in breaking it at a high current level. In the HVDC system, the hybrid DC cutoff technology has been commercialized and is in operation [6,7,8,9]. This is typically a structure in which a power semiconductor or superconducting current-limiting element is combined with a mechanical
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