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The current global trend in the distribution networks is to use Distributed Generation (DG). The coordination problem between protection devices is a challenge which faces DG insertion to the distribution network. In this paper, the effect of DG on the distribution networks protection system is investigated. The real network of the North Delta Electric Distribution Company (NDEDC) in northern Egypt is studied. The study focuses on the overcurrent, the earth fault relays and auto-recloser (AR), where they represent the protection system used in distribution networks. The NDEDC real data are implemented with all of the protective devices which are modelled with their practical settings using Matlab/Simulink. Different scenarios for integrating the DG with the studied system have been implemented and discussed. Finally, recommendations are introduced for NDEDC protection systems.