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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Capstone MicroTurbine Electrical Installation Appendix A Input Impedance Calculations - Examples Refer to the Model C30 Electrical Technical Reference (410000) and the Model C60 Electrical Technical Reference (410001) for input impedance requirements. Three examples of the total electrical input impedance calculations which detail the values considering the MicroTurbine output looking towards the utility are provided as follows: Example 1: Model C30 - Considering 1 MicroTurbine Total Impedance for all conductors: ZL = 0.5%, ZR = 1.0% 30 KVA MicroTurbine 480 V 208 V 45 kVA 240 V Utility 5 kV ZL1 =5.6% ZL2 =6.4% ZL3 =5% ZR1 = 1.7% ZR2 = 1.9% ZR3 = 1.6% ZL (Total) = 5.6%(30/45) + 6.4%(30/45) + 5%(30/60) + 0.5% = 11% (Value exceeds acceptable limits) ZR (Total) = 1.7%(30/45) + 1.9%(30/45) + 1.6%(30/60) + 1% = 4.22% (Value is within acceptable limits) Example 2: Model C60 - Considering 1 MicroTurbine Total Impedance for all conductors: ZL = 0.5%, ZR = 1.0% 60 KVA MicroTurbine 480 V 208 V 75 kVA 240 V Utility 5 kV 45 kVA 60 kVA ZL1 =5.6% ZL2 =6.4% ZL3 =5% ZR1 = 1.7% ZR2 = 1.9% ZR3 = 1.6% ZL (Total) = 5.6%(60/75) + 6.4%(60/75) + 5%(60/100) + 0.5% = 13.1% (Value exceeds acceptable limits) ZR (Total) = 1.7%(60/75) + 1.9%(60/75) + 1.6%(60/100) + 1% = 4.85% (Value is within acceptable limits) 410009-001 Rev C (September 2003) Page 22 of 24 75 kVA 100 kVA 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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