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Capstone Turbine Corporation 21211 Nordhoff Street Chatsworth CA 91311 USA Technical Reference: Capstone MicroTurbine Electrical Installation Table 5. Grid Connect Allowable Configurations Matrix 9XXX None Figure No. Standards Compliance Utility Service Transformer Type UL1741 CE/Other Wye Delta 10 X X X 11 X X X 12 X X X X Autotransformer with Grounded Neutral Wye/Wye Isolation Wye/Delta Isolation Autotransformer with Floating Neutral 13 X 4.1. Phase Sequence The output phase sequence is L1 to L2 to L3. Notice that improper phase sequence connections may cause the microturbine to trip. It is the installer’s responsibility to verify the proper phase connections between the microturbine and the grid. 4.2. Transformer Applications and Impedance A voltage transformer for the microturbine will be required if the circuit voltage is outside the 400 to 480 Volts AC range. All GC mode installations with transformers between the microturbine and the grid6 must consider maximum grid impedance. Proper sizing of transformers in the installation is required to limit the impedance seen by the microturbine. For impedance limits required for installation of each microturbine model, refer to the Electrical Specification documents referenced in Table 1. Refer to Input Impedance on page 30 for example calculation of the impedance of the line run and transformers to the utility source. 4.3. Allowable Connections Figure 9 through Figure 13 present the permitted utility (or transformer) connections for Capstone products. 6 To a point in the distribution grid where the voltage is 6 kV or higher 410009 Rev F (October 2013) Page 17 of 31 Capstone reserves the right to change or modify, without notice, the design, specifications, and/or 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
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