Increased distributed generation (DG) in systems always brings about the impacts on maintaining the operation of protection systems. This paper concentrates on the impact on the protection reach reduction and proposes a solution to eliminate this impact by using a suitable DG transformer in parallel with a grounding reactance at the neutral point of the transformer's winding. Based on this, a Tabu search algorithm is proposed to maximize DG when the system operating limits and the protection reach reduction are considered as constraints. In order to illustrate the effectiveness of this algorithm, a case study is performed through an IEEE 34 Node Test Feeder. connection. Section 3 analyzse this issue, and then an appropriate connection type is proposed. After analyzing impacts of DG on the reach of relay in Section 4, a practical and robust algorithm for maximizing DG is developed in Section 5 using a sensitivitybased method. This method gradually increases the size of DG until the constraints of system operating limits and protection reach reduction are reached. To extend the method to several DG systems, the multivariable optimization problem is developed by using the Tabu search algorithm, which is presented in Section 6. Then, these two algorithms are applied to an IEEE 34 Node Test Feeder in Section 7.Dao Van Tu (Student member) received the Engineer degree and master's degree in power systems from Ha Noi