Designing a reliable protection system for an intentionally islanded Microgrid with multiple grid building units at an early planning stage is a complex engineering task. Necessary investments could be restricted by the help of a supporting planning tool proving the feasibility of using a minimum effort add-on protection system. An according tool is implemented as a proof of concept and is successfully applied to show feasibility in a real world Microgrid. Potentials for further reducing safety margins and complexity of the planning process by a more precisely defined grid building units' fault behaviour in islanded mode become obvious.
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