| Title |
Failure Characteristics Analysis of DC Circuit Breaker According to Type of Current Limiting Unit Using Superconductor |
| Authors |
구희석(Hui-Seok Gu) ; 박상용(Sang-Yong Park) ; 최효상(Hyo-Sang Choi) |
| DOI |
https://doi.org/10.5370/KIEE.2019.68.12.1669 |
| Keywords |
Transformer; Fault current; Circuit breaker; DC Circuit breaker; Superconductor; Quench |
| Abstract |
This study proposes two types of current-limiting DC circuit breakers coupled with a superconductor. The first superconductive DC circuit breaker limits the size of the fault current by quenching the superconductor when a fault occurs. Then the limited fault current is blocked by the DC circuit breaker. The second transformer-type superconductive DC circuit breaker limits the fault current and performs blocking operation through the impedance characteristics of the transformer and the quench characteristics of the superconductor. This study analyzes the blocking characteristics of the two types of current-limiting DC circuit breakers. The blocking performance, current limiting rate, and power sharing ratio of the breakers were analyzed using the same simulation conditions for each type of breaker.
The simulation results showed that the transformer-type superconductivity DC circuit breaker has the highest fault current limiting rate. Furthermore, the superconductive DC circuit breaker completed the fault current blocking operation the fastest. Finally, it was verified that the applied power burden to the superconductor is lowest at the transformer-type superconductive DC circuit breaker. |