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A DC circuit breaker based on superconducting current-limiting technology

There are various kinds of HVDC circuit breakers (CBs) so far, however, their current interrupting capability is limited. Therefore, A DC circuit breaker (DCCB) based on superconducting current-limiting technology and self-excited oscillation technology is proposed to enhance the current interrupting capability. The proposed DCCB has two modules in series, which are superconducting current-limiting module and dc interrupting module, respectively. The current-limiting module includes superconductor and parallel resistor which limits extremely high short-circuit current to a low value. Then the DC interrupting module using self-excited method interrupts the limited current. The objective of this paper is to determine the characteristics of the current limit module of the proposed DCCB. Experimental research work shows that superconductor has great current limiting property and current, voltage distribution capability that can be used in parallel and series. The duration of current does not influence current distribution property of current-limiting module.