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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Application Guide: Dual Mode Fast Transfer Application Guide Note that if the Utility voltage experiences disturbances outside the protective relay limits during the reconnect time delay, the MicroTurbine will wait until sensed voltage is back within limits and then restart the reconnect sequence. Also note that the MicroTurbine may not continue in Hot Standby for more than two hours, and will shut down if it is not able to either transition to Grid Connect mode or if it is not commanded to go back to Stand Alone operation. Also note that Capstone has included a second timer that is initiated when the SA Enable signal goes inactive, in order to prevent repeated cycling between Stand Alone and Hot Standby modes. If the MicroTurbine is commanded to transition to Hot Standby, and subsequently is commanded to return to Stand Alone, this second timer delays transition back to Hot Standby for ten minutes after the initial SA Enable signal went inactive. External Controller Concerns Since control of the MicroTurbine is now being set by external signals, it is important that the logic and sequence of operations be correct to avoid misapplication. CAUTION: Causing the Grid Connect and Stand Alone enable inputs to be connected at the same time will cause automatic shutdown of the MicroTurbine and faults to be logged. To avoid this, make sure that the control logic to the mode-enable inputs does not allow simultaneous activation of Grid Connect and Stand Alone enable signals. CAUTION: Commanding the MicroTurbine to operate in an incorrect mode will also cause it to automatically shut down and log the appropriate fault history. For example, the MicroTurbine will not provide voltage output to support a Stand Alone load if it is commanded to operate in Grid Connect mode. To avoid this, make sure the control logic is enabling the correct mode of operation. CAUTION: Commanding a MicroTurbine to reconnect to the Utility grid may violate Utility interconnection regulations that require a manual reconnect procedure. To avoid this, any external control logic must be commanded to operate in accordance with local Utility interconnection regulations. WARNING: Externally connecting a MicroTurbine operating in Stand Alone mode to an energized Utility grid may cause damage to loads that are being powered by the MicroTurbine if they are not reconnected in phase with the Utility source. Other equipment may also be damaged as a result, including the distribution system and even the MicroTurbine itself. To avoid this, make sure that power connection is not made to a Utility source when the MicroTurbine is operating in Stand Alone mode. Capstone has developed an external accessory that properly addresses the application issues noted above – the Dual Mode Controller (or DMC). The section below describes how this DMC operates to command the MicroTurbine modes and isolate protected loads from the Utility grid. Dual Mode Controller Functionality Capstone offers a Dual Mode Controller (DMC) accessory that provides the external control and isolation functions to take advantage of the MicroTurbine’s Fast Transfer functionality described above. Figure 7 shows a simple one-line diagram of the DMC with Utility grid, C60/C65 MicroTurbine, and protected load. The DMC includes a motor-operated isolation switch M1, an undervoltage relay (UVR) that senses the Utility grid voltage, and control logic to operate M1 and send and receive signals from the C60/C65 MicroTurbine. 480011 Rev B (February 2006) Page 8 of 14 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 - Model C60/C65 Dual Mode – Fast Transfer
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