This paper describes the implementation of reliability calculations into the routine network planning of a distribution network operator. Firstly, actual developments putting this issue on the agenda are described. Then, it is argued why medium voltage (MV) networks form the logical starting point. Hereafter, the basics of reliability calculations and the approach towards reliability calculations, as it is implemented in the MV network analysis program Vision, are elaborated upon. Finally, the practical implementation and applicability of reliability calculations is discussed. It is argued that the results of reliability calculations must be interpreted carefully, but that they can nevertheless be of good use in specific situations.

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