4.1 ERMUSR 02-13-2018 - Laserfiche WebLink

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SCHEDULE 3—INTERCONNECTION PROCESS,TECHNICAL REQUIREMENTS,AND OPERATING PROCEDURES D) Engineering Studies During the process of design of a Generation System interconnection between a Generation System and an Area EPS, there are several studies which many need to be undertaken. On the Local EPS (Customers side of the interconnection)the addition of a Generation System may increase the fault current levels, even if the generation is never interconnected with the Area EPS's system. The Interconnection Customer may need to conduct a fault current analysis of the Local EPS in conjunction with adding the Generation System. The addition of the Generation System may also affect the Area EPS and special engineering studies may need to be undertaken looking at the Area EPS with the Generation System included.Appendix D, lists some of the issues that may need to receive further analysis for the Generation System interconnection. While, it is not a straightforward process to identify which engineering studies are required, we can at least develop screening criteria to identify which Generation Systems may require further analysis. The following is the basic screening criteria to be used for this interconnection process. 1) Generation System total Nameplate Capacity does not exceed 5%of the radial circuit expected peak load.The peak load is the total expected load on the radial circuit when the other generators on that same radial circuit are not in operation. 2) The aggregate generation's total Nameplate Capacity,including all existing and proposed generation,does not exceed 25%of the radial circuit peak load and that total is also less than the radial circuit minimum load. 3) Generation System does not exceed 15%of the Annual Peak Load for the Line Section, which it will interconnect with.A Line Section is defined as that section of the distribution system between two sectionalizing devices in the Area EPS. 4) Generation System does not contribute more than 10%to the distribution circuit's maximum fault current at the point at the nearest interconnection with the Area EPS's primary distribution voltage. 5) The proposed Generation System total Nameplate Capacity,in aggregate with other generation on the distribution circuit,will not cause any distribution protective devices and equipment to exceed 85 percent of the short circuit interruptingcapability. 6) If the proposed Generation System is to be interconnected on a single-phase shared secondary, the aggregate generation Nameplate Capacity on the shared secondary, including the proposed generation,does not exceed 20kW. 7) Generation System will not be interconnected with a "networked"system Interconnection Process for Distributed Generat g Systems