| Title |
A Study on the Adequacy of Reliability Criteria for Simultaneous Double-Circuit Contingencies in 765kV Transmission Lines in Korea |
| Authors |
Eui-Chul Shin ; Kwang-Seo Park |
| DOI |
https://doi.org/10.5207/JIEIE.2026.40.3.189 |
| Keywords |
Double-circuit faults; ENTSO-E; N-2 criterion; NERC; OCCTO |
| Abstract |
This paper evaluates the adequacy of the N-2 reliability criterion for simultaneous double-circuit faults in Korea’s 765kV transmission lines. While international practices treat such events as low-probability contingencies and allow flexible operational measures, Korea applies a deterministic and strict no-interruption criterion. Simulation results indicate that the system remains stable under single-circuit faults, whereas loss of synchronism occurs under double-circuit faults. Although such events have significant system impacts, their occurrence probability is substantially reduced by design and protection measures. Therefore, a risk-based and performance-oriented approach is required to achieve a balanced consideration of reliability and economic efficiency. |