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This paper analyzes the effect of the implementation of photovoltaic systems interconnected to a branch circuit of an electricity distribution network in the city of Bogota. By computational simulations NEPLAN tool, connecting the photovoltaic system to the network, the change is evidenced in the direction of power flow, the variation in the levels of voltage, current and power losses, which are then compared with voltage values obtained from Colombian rule governing maximum and minimum levels in the distribution network. Somehow this article contributes to the increase of projects with renewable energy such as developing it demonstrates the improvement that would be implemented in story to operating conditions of the distribution network, improving voltage profiles, complying with the limits established by regulation voltage, and decreasing the amount of current flowing through the conductors, which generates an increase of the useful life thereof. It should be noted that these results are valid under the conditions previously established, and that in a different context can present a different performance.