TECH REF C30 Grid Connect Op

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TECH REF C30 Grid Connect Op ( tech-ref-c30-grid-connect-op )

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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Grid Connect Operation – Capstone Models C30 and C60/C65 The Reverse Power Flow Protection dispatch mode requires installation of an external power meter connected to the MicroTurbine. The MicroTurbine alone cannot know where the utility ends and the facility begins. Definition of this point is the job of the external power meter, and the point is determined by the location of the power meter’s current transformers. • CRMS: From the menu, select Settings > Load Management Settings, toggle the Reverse Power Protection switch to ON, and then configure settings. • Display panel: Navigate as follows: Load Management > Reverse Power Protection, enable the feature, and enter the desired time period. Load Management Parameter Description Parameter Value Default Rev Pwr Protect Enables the system to automatically Disable/Enable 0 (Disabled) shutdown if the power meter registers 0 to 120 seconds 120 negative power flow for specified time External Power Meter Installation The Load Following and Reverse Power Flow functions require the installation of a 3-phase power meter at a remote location from the MicroTurbine. MicroTurbine hardware and software is designed to accept signals from a pulse-output power meter. See Figures 6 and 7 for power meter connections. Pulse-output power meters provide a contact closure pulse indicating when a specific amount of energy has passed through the meter. The quantization of energy per pulse is either fixed or programmable depending upon the meter. There are two sets of contact closure inputs. One set provides contact pulses for forward energy flow, and the other set provides energy for reverse energy flow: • Power flow in the forward direction (toward the loads) is measured as +PWR. • Power flow in the reverse direction is measured as –PWR. The external power meter should be placed in a location to produce the demand signal. Loads on the load side of the power meter current transformer location will produce demand signals, load on the utility side will not. The demand on the MicroTurbine will be calculated as the difference between the Utility Power setting entered during this setup and the actual load measured by the power meter. Branch A Branch B Power Meter Utility Power Meter Current Transformers For example, in the illustration above, loads on Branches B and D only will determine the MicroTurbine power output demand. Branch A or C loads have no effect. The Micro-Turbine may be connected at either Breaker location, C or D (or an entirely difference circuit). Power output demand will still be determined by the flow through the power meter current transformers. Breaker C Breaker D MicroTurbine Typical Power Meter Interconnection 410027 Rev F (February 2006) Page 19 of 23 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.

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