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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Capstone MicroTurbine Electrical Installation Electrical Connections – Dual Mode Dual Mode electrical interconnections are presented in the following paragraphs. Electrical Cables and Switchgear If the Capstone MicroTurbine is equipped with the Stand Alone option, it is capable of either Grid Connect operation or Stand Alone operation, and may be converted from one to the other simply and easily. An installation designed to switch between Grid Connect and Stand Alone operation is identified as a Dual Mode installation. Loads on the same circuit with the MicroTurbine and which may be powered either by the grid or by the MicroTurbine in Stand Alone mode are defined as Protected Loads. Conversion from one mode to the other requires the following: 1. A shutdown of the MicroTurbine, followed by a 2. Transfer of the electrical connections, and then 3. A reconfiguration of the interlocks and software, and finally, 4. A restart of the MicroTurbine. These steps may be accomplished manually, or automatically. Automatic transfer and reconfiguration may be accomplished with the Capstone Automatic Dual Mode Controller. Refer to the Dual Mode Controller Application Guide (513000) for additional details. Whether manual or automatic, the electrical conversion from one mode to the other must be planned with care, particularly the neutral and ground connections. Safety requirements, code requirements, and functional requirements must all be met. Sizing Protected Loads Notice that Protected Loads in a Dual Mode application must be sized as though the MicroTurbine will operate on the loads in the Stand Alone mode, where the cumulative load to each phase is current-limited. Phase Rotation Dual mode applications must match the phase rotation of the MicroTurbine in the Stand Alone mode with the phase rotation of the grid, to prevent load phase reversal when switching modes. Therefore, the output from the MicroTurbine MUST BE connected L1-L2-L3 counterclockwise. 410009-001 Rev C (September 2003) Page 18 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 | Technical Reference Capstone MicroTurbine Electrical Installation Introduction
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