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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Application Guide: Interconnection for Capstone MicroTurbines Special Applications Dual Mode Operation A Capstone MicroTurbine can be used as an alternative power source to the grid, supplying a critical load. Automatic or manual load transfer from and to a utility source can be accomplished by either traditional auto-transfer switch, or by the Capstone Dual Mode Controller (DMC), serving as a transfer switch and also acting as intertie disconnect between the grid and the load. An intentional island will be created when load is balanced with the MicroTurbine output. The critical load can be supplied from either: Powercompanygrid(LinePower) Both,gridandMicroTurbineinparallel,GridConnect(GC)mode TheMicroTurbine,StandAlone(SA)mode The transfer is initiated automatically by: Undervoltagerelay,builtintotheDMC,incaseofgridoutage,or Manually,byoperatorontheDMCfrontpanel In Grid Connect Mode (GC), a grid outage is detected by the DMC undervoltage relay, which then isolates the utility from the MicroTurbine by opening the DMC motorized switch. When the grid returns to normal operation, the DMC will close the utility line circuit, supplying power to the load. In Stand Alone mode (SA), the MicroTurbine solely supports the load, providing required voltage, active and reactive power. Variable time settings accomplish coordination between DMC and the MicroTurbine protection devices. In case a grid voltage sag is in excess of set time (from 0.2 to 10 seconds) and voltage (from nominal to 50%), the DMC undervoltage relay will cause the DMC switch to open, isolating the critical load and MicroTurbine from the grid. In case of a grid outage, the DMC undervoltage relay will trip the switch immediately. In the latter case, the MicroTurbine protective relays will shut down the unit(s), transferring from GC to SA operations. The DMC can be installed at various locations and voltage levels. In the shown example, the DMC is specified for 208 Volts at the Meter (PCC). Range is from 380 Volts to 540 Volts; time range is from 0.2 to 10 seconds. 480001-001 Rev A (April 2003) Page 8 of 11 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 equipment ratings, 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 | Application Guide Interconnection for Capstone MicroTurbines
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