Light duty dc circuit breakers have been in use since long. However, there is lack of suitable circuit breakers for HVDC systems. At present most of the HVDC systems are with two terminals and in a two terminal HVDC system, HVDC circuit breakers are not required because fault current can be controlled or eliminated by controlling the firing angle of the converters. In multi-terminal HVDC systems, the need of HVDC circuit breakers will arise.
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