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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Capstone MicroTurbine Electrical Installation Grounding and Neutral Connections The neutral-to-ground connection requirements in the Dual Mode operation are identical to those in the Grid Connect mode of operation. The neutral-to-ground bar (if equipped) MUST BE removed from all MicroTurbines in the system. CAUTION It is not possible to connect the DMC to a delta utility service or local transformer. The protected loads must be supplied from a ground-referenced source in both Grid Connect and Stand Alone modes. For a Wye service or transformer, the ground reference exists via the Neutral when the system is running GC with the DMC switch closed or when the system is running SA with the DMC switch open. For a delta service or transformer, the ground reference exists via the phases when the system is running GC with the DMC switch closed, but the ground reference is lost when the system is running SA with the DMC switch open. (The open DMC switch isolates protected loads from the phase to ground connection in the utility service or local transformer.) Therefore, it is not permitted to supply the DMC from a delta utility or local transformer. Figure 15 presents direct connection using the Dual Mode Controller. The DMC is installed between the MicroTurbine and the protected loads, and the utility or local transformer. The neutral-to-ground bar MUST BE removed from the MicroTurbine User Connection Bay. A single neutral-to-ground connection MUST BE made at the local utility. Single Unit Branch or MultiPac Circuit Connections Disconnect Branch Dual Mode Circuit Controller Disconnect Wye Utility Service or Local Transformer L3 L2 L1 N G L3 L2 L1 Protected Loads Ground Figure 15. Dual Mode Connections: Direct Connection 410009-001 Rev C (September 2003) Page 19 of 24 This information is proprietary to Capstone Turbine Corporation. Neither this document nor the information contained herein shall be copied, disclosed to others, or used for any purposes other than the specific purpose for which this document was delivered. Capstone reserves the right to change or modify without notice, the design, the product specifications, and/or the contents of this document without incurring any obligation either with respect to equipment previously sold or in the process of construction.PDF Image | TECH REF Elec Install
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