Fault location identification of a hybrid HVDC-VSC system containing cable and overhead line segments using transient data

Identifying the exact fault location within a HVDC system is critical in order to perform rapid system restoration for enhanced system reliability and operation. A method is proposed to locate faults using transient system data generated by the fault with system measurements at the HVDC converter terminals. The proposed method can locate temporary and permanent faults on a hybrid HVDC-VSC system, where the transmission medium consists of long segments of both underground cable and overhead line. The proposed routine is based on modeling the behavior of the traveling wave and making use of Rogowski coils for measurements.