Using apparent resistance for fault discrimination in multi-terminal DC systems

Apparent resistance can be used by each power distribution element - supply converters and power circuit contactors - to identify and respond to faults in multi-terminal dc power systems. Each element can take appropriate independent action based on its own local measurements: Supply converters can go into current limiting or shut-down modes and (non-fault breaking) contactors can segment and/or reconfigure the distribution system. Use of local measurements permits the system to take immediate action without relying on communication networks. Faults can be identified with high certainty within 10 to 20 ms if the resistance measurement accuracy is 1% or lower.