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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Capstone MicroTurbine Electrical Installation Electrical Connections – Grid Connect Figure 1 presents the various allowable connections for the Grid Connect mode. The upper section of the figure shows the allowable grid connections that are UL1741 compliant, and the lower section shows the allowable connections that are permissible (safe) for the Capstone MicroTurbine but are NOT UL1741 compliant. For details on each configuration, refer to the figure number shown for that configuration. LEGEND: 3P = 3-Phase 3W = 3-Wire 4W = 4-Wire MT = MicroTurbine w/o = without GC = Grid Connect SA = Stand Alone Allowable Grid Connections UL1741 Compliant 1,2 Y-Service, with Neutral 3 - Service See Fig 7 -Service See Fig 12 480V (400-480) See Fig 4 Non-Isolated (Y or Service) 480V (400-480) Non-480V See Fig 8 See Fig 9 Notes: Non-480V See Fig 5 Non-Isolated Isolated See Fig 6 Direct Connection (3P-4W) Y-Autotransformer (3P-4W) Allowable Grid Connections NOT UL1741 Compliant 1,5 Isolated Direct Connection w/o Neutral (3P-3W) Y-Autotransformer w/o Service Neutral (3P-3W to Service) Y- Transformer (Y to MT) See Fig 10 Y-Service See Fig 11 See Fig 12 1(a). The MicroTurbine chassis ground must always be solidly connected to the same earth ground as that at the Utility Service. 1(b). An electrical disconnect device, with over-current protection (fuses or circuit breaker), must be installed within sight of the MicroTurbine. 1(c). Phase-to-groundvoltageattheMicroTurbinemustneverexceed480Vrms,or277Vrmsforthe Model C30 Stand Alone Units (+10% high-line allowed). 2. The Utility Service must be ground referenced, either through solid or resistance grounding. 3. The Utility Service Neutral must be solidly connected to the MicroTurbine Neutral or to the service side of any Transformer Neutrals. 4. The MicroTurbine side Transformer Neutral must be solidly connected to ground and to the MicroTurbine Neutral. 5. Model C30 GC (Not SA) and Model C60 Units may be operated corner grounded (not recommended). Figure 1. Allowable Grid Connections 410009-001 Rev C (September 2003) Page 5 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. Y-Y Transformer 4 (3P-4W) -Y Transformer ( toMT) - Transformer ( toMT) Y- Transformer 4 (Y to MT) - Transformer ( toMT)PDF Image | Technical Reference Capstone MicroTurbine Electrical Installation Introduction
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