4.1. ERMUSR 12-17-2019 - Laserfiche WebLink

Home Browse Search

SCHEDULE 3 - DISTRIBUTED ENERGY RESOURCES INTERCONNECTION PROCESS 4.Interconnection Issues and Technical Requirements A)General Requirements - The following requirements apply to all interconnected generating equipment. The Area EPS shall be interconnection requirements. i)Visible Disconnect - A disconnecting device shall be installed to electrically isolate the Area EPS from the Generation System. The only exception for the installation of a visible disconnect is if the generation is interconnected via a mechanically interlocked open transfer switch and installed per the NEC (702.6) prevent the inadvertent interconnection of normal and alternate sources of supply in any operation of the transfer The visible disconnect shall provide a visible air gap between Interconne Generation and the Area EPS in order to establish the safety isolation required for work on the Area EPS. This disconnecting device shall be readily accessible 24 hours per day by the Area EPS field personnel and shall be capable of padlocking by the Area EPS field personnel. The disconnecting device shall be lockable in the open position. approved, manual safety disconnect switch of adequate ampere capacity. The visible disconnect shall not open the neutral when the switch is open. A draw-out type circuit breaker can be used as a visual open. The visible disconnect shall be labeled, as required by the Area EPS Operator to inform the Area EPS field personnel. ii)Energization of Equipment by Generation System The Generation System shall not energize a de- energized Area EPS. The Interconnection Customer shall install the necessary padlocking (lockable) devices on equipment to prevent the energization of a de-energized electrical power system. Lock out relays shall automatically block the closing of breakers or transfer switches on to a de-energized Area EPS. iii) Power Factor - The power factor of the Generation System and connected load shall be as follows; (1) Inverter Based interconnections shall operate at a power factor of no less than 90%.at the inverter terminals. (2) Limited Parallel Generation Systems, such as closed transfer or soft-loading transfer systems shall operate at a power factor of no less than 90%, during the period when the Generation System is parallel with the Area EPS, as measured at the Point of Common Coupling. (3) Extended Parallel Generation Systems shall be designed to be capable of operating between 90% lagging and 95% leading. These Generation Systems shall normally operate near unity power factor (+/-98%) or as mutually agreed between the Area EPS operator and the Interconnection Customer. iv)Grounding Issues (1) Grounding of sufficient size to handle the maximum available ground fault current shall be IEEE Guide for Safety in AC Substation , ANSI/IEEE Standard 80. (2) It is the responsibility of the Interconnection Customer to provide the required grounding for the Generation System. A good standard for this is the IEEE Std. 142-1991 338