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The advantages of dc microgrids are considerable, the protection of dc distribution systems has posed many challenges, such as autonomously locating a fault within a microgrid, breaking a dc arc, dc protective equipment, and certainly the lack of standards, guidelines, and experience. The Figure shows a fault detection, isolation, and identification of fault location scheme for a low-voltage dc ring bus microgrid system that can be implemented for the positive and negative pole in bipolar systems. Also, is interesting to talk about that exist two types of faults exist in dc systems: 1) line to line and 2) line to ground.

Conceptual diagram of the proposed protection scheme in source

[Source: S. Vimalraj, P. Somasundaram. «Fault detection, isolation and identification of fault location in low-voltage DC ring bus microgrid system». International Journal of Advanced Research in Electrical, Electronics and Instrumentation Engineering. Vol. 3, Special Issue 2, April 2014. ISSN (Online): 2278-8875].

Dr. Jorge Luis Mírez Tarrillo – PERU
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