DC Distribution Fault Analysis, Protection Solutions, and Example Implementations

A dc fault current can be approximated by its equivalent fault inductance. DC circuit breaker-based or converter-based protection solutions are different in protective devices and protection methods. Fast fault interruption is essential and critical to dc distribution protection. Specific speed requirements are derived and analyzed for different protection solutions. The effectiveness of different dc protection solutions is demonstrated on a dc distribution system. The issues in dc protection coordination are studied and discussed.

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