| Title |
Extension of Cut-off Capacity of DC Circuit Breaker due to Superconducting Coil Application |
| Authors |
최혜원(Hye-Won Choi) ; 최효상(Hyo-Sang Choi) |
| DOI |
http://doi.org/10.5370/KIEE.2019.68.4.593 |
| Keywords |
Circuit breaker ; DC SCB ; Superconducting ; Interruption capacity |
| Abstract |
We proposed a current Interruption type DC superconducting circuit breaker(I-DC SCB), a protection device that combines the current limiting technology of a superconductor with the cut-off technology of circuit breaker. Unlike existing protective devices, the current I-DC SCB is a device that combines two protection functions, notably improving failure probability and operational reliability. It is also applicable to all DC systems, such as HV, MV, and LVDC, due to the ease in capacity increase. The 100 kV I-DC SCB was designed after taking into account the actual power system conditions, followed by an analysis of the transient characteristics and the breaking range of the limiter. The results of the analysis showed that the I-DC SCB had a fault current limit of about 75% at the rated voltage, and completed the cut-off operation within about 20 ms. |