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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 Service Bulletin: C30 Stand Alone Corner Grounding Recommended Solution To prevent failure, an installation configured corner-grounded delta must be reconfigured to the Wye configuration. Per Capstone approved installation, replace the Delta transfer with a Wye transformer connecting the high voltage wiring as shown in Figure 2. When configured in a Wye configuration, the MicroTurbine will be operating in its designed configuration and comply with UL1741 standard for grid interconnection. MicroTurbine Connections Branch Circuit Disconnect Utility L1 L2 L3 N G Solid Connection or Resistor with R=100 Ohms or Less Ground Alternative Solution Figure 2. Wye-to-Wye Transformer Configuration An alternative solution to continue uninterrupted operation with a Delta transformer for existing installations only is shown in Figure 3 below. To modify the configuration, remove the corner ground from the Delta winding and connect a neutral-to-ground connection at the branch circuit disconnect. Any external power metering equipment may only be installed on the utility Wye, and not between the MicroTurbine and Delta transformer. As described in the MicroTurbine Electrical Installation (410009) manual, a MicroTurbine installed in a Delta configuration does not comply with UL1741 standard for grid interconnection. MicroTurbine Connections Branch Circuit Disconnect Utility L1 L2 L3 N G L1 L2 L3 Ground Figure 3. Revised Delta-to-Wye Transformer Configuration (does not conform with UL1741) 450012-001 Rev A (December 2002) Page 2 of 3 SB0047 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 | Reconfigure Corner Grounded Delta Configuration
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