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Islanding protection is an essential and one of the more challenging aspect of distributed generation interconnection protection. This article demonstrates how intelligent relays, employing multivariate analysis and data mining techniques, can be used for the islanding protection of synchronous distributed generation in the presence of high-speed reclosing. The developed methodology is outlined and its application is illustrated for a number of diverse system operating states. The performance of the intelligent relays is assessed and compared against currently used islanding protection devices.