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This paper deals with the concept development and laboratory testing of an adaptive protection system for distribution networks with distributed energy resources. Adaptation of protection relay settings according to currently available short-circuit current at respective grid nodes, is one solution to cope with the challenges originating from distributed generation. The challenges in conventional protection systems in low and medium voltage grids are discussed and a new concept of an adaptive network overcurrent protection is developed. The soft- and hardware realization of the concept are described and first results of laboratory tests are presented

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Network security assessment is decisively based on the protection security. Dispersed generation is increasing in distribution networks. This development is affecting the protection behaviour adversely. Maloperation of protection relays becomes likely. Thus methods of protection security assessment are necessary to cope with the new network conditions of distributed generation and all their impacts. This paper is presenting such a methodology using fully software assisted procedures. A systematic protection security assessment of variants of network and protection configurations is feasible with a restricted operating expense. For the evaluation and illustration of the big amount of output data, an appropriate graphical approach will be shown.

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