The faster performance of FRT requirements than protective equipment during a fault may cause some distributed generation sources (DGs) to disconnect from the network. This has created serious challenges in terms of reliability and load supply of the network. Therefore, the Fault Ride Thruogh (FRT) requirements of distributed generation play an important role in the reliability and performance of protective equipment in the distribution network during a fault. A solution to this problem is to select an index with criteria that are affected by FRT requirements for the presence of DGs in the network. In this paper, three criteria are proposed to select the best proposed index. In the proposed index, the unsupplied energy (ENS) is a criterion for determining the impact of DG presence from the perspective of FRT requirements. Also, by comparing the FRT operation time with the protection equipment operation time, a criterion for the performance of protection equipment from the perspective of FRT requirements is presented. With the presence of DG, the fault current passing through the protective equipment will change and, consequently, the operating time of the protective equipment will also change, so the time interval between the operation time of the main and backup equipment will be a suitable criterion for determining the effect of the presence of DG in the network. This index determines the impact of FRT requirements on each of the criteria. By considering all these criteria, the proposed index will examine the impact of FRT requirements on the presence of DG in different network buses. The proposed index can be used to determine the best bus with the least impact of FRT requirements. The smaller the proposed index, the less impact the ENS criteria, main protection, and coordination constraints will have on FRT requirements. In other words, a smaller value of the proposed index means a reduction in outages and an increase in the operating speed of the protective equipment. The proposed index has been simulated on a sample test system. The presented results demonstrate the ability of the proposed method to increase the FRT requirements while maintaining protection coordination and increasing reliability. Examination of the proposed index under different conditions shows that the proposed method is well capable of measuring the effectiveness of the criteria under different conditions including changing DG capacity and fault type.