Development and Field Application of Metallic Return Protecting Breaker for HVDC Transmission

HVDC Circuit Breakers: A Review Identifying Future Research Needs

“…Breakers where the inductance L c of the commutation path is a separate coil [62] or uses the stray inductance of the path [61] have both been proposed. If the capacitor in the commutation path is precharged, it can be inserted with a spark-gap [67], [68] or a closing switch [52], [69]. The capacitor can be charged with a dedicated charging unit with isolation switch or directly from the line [52], [69].…”

HVDC Circuit Breakers–A Review

“…Given the need for fast dielectric recovery, and high insulation strength in HVDC breaker applications, Vacuum Interrupter (VI) and Sulphur Hexafluoride (SF6) based switches have been favored in practical HVDC breaker designs [36], [49], [51], [70], [89], [90]. Air-blast [32] and oil [91] breakers have also been used as dielectric media in HVDC breakers. However these technologies have fallen into disuse due to the superior dielectric properties of vacuum and SF6 systems.…”