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In this paper we present a computational tool for analyzing the dynamic operation of overcurrent relays. The analysis of operation of the overcurrent relay is complex compared to other principles of protection because the time operation is a function of the dynamics of the fault current. The main purpose of this article is geared towards the analysis of the operation of relays with different operating conditions using computational resources. The developed tool allows the evaluation of the design and implementation stages of relay allowing the analysis of the dynamic response to real or simulated events. The application proposal also allows editing of the conventional and unconventional time curves. Finally, we present some case examples to illustrate the activities that are possible to perform with the tool presented.