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2. Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Application Guide: Dual Mode Fast Transfer Application Guide An external control system does not force a transition from Grid Connect to Stand Alone, but the MicroTurbine responds directly to a Utility fault, and then automatically enters its reconnect sequence to transition back to Grid Connect operation. Scenario 1 represents “Fast Transfer” between the two modes of operation. In this case, any protected loads will see an interruption in power of several seconds going to Stand Alone operation (depending on the control system), followed by another interruption of several seconds when the system transfers back to Grid Connect mode. Scenario 2 represents a Utility disturbance only. The protected load will see the transient that caused the MicroTurbine to disconnect, and may not see any power interruption at all. Stand Alone to Grid Connect Mode The transfer back from Stand Alone to Grid Connect operation includes a one minute fixed time delay after the SA Enable signal becomes inactive, followed by the standard reconnect sequence used for any transfer to Grid Connect operation. As shown in Figure 6, the MicroTurbine continues in Stand Alone operation for one minute after the SA Enable signal goes inactive, then automatically stops power output and goes into Hot Standby mode. As an interlock control signal, one of the output relays on UCB terminal J15 can be programmed to indicate when the MicroTurbine is supplying power to the load in Stand Alone mode (“SA Load” in Figure 6). The opening of the selected SA Load output relay terminals A to B can initiate an external logic sequence that reconnects the MicroTurbine and protected loads to the Utility grid, activates the GC Enable input to the MicroTurbine, and switches the Start/Stop input to Stop. This will cause the Utility voltage to be sensed at the MicroTurbine output terminals, and the MicroTurbine will now begin its reconnect time delay sequence, resynchronize, and output power in Grid Connect mode if the Utility voltage remains within the protective relay setting limits for the reconnect time delay. 1 min Inactive Fixed Time Delay External Control Actions 5 - 30 min Normal Active Stop Protected Load Voltage Inactive GC Enable (2 to grd) Active Start SA Enable (3 to grd) Start/Stop (4 to grd) SA Load (A to B) MicroTurbine Output MicroTurbine State Inactive (Open) Active (Closed) Reconnect Time Delay Stand Alone Hot Standby Grid Connect Page 7 of 14 Figure 6. Fast Transfer from Stand Alone to Grid Connect 480011 Rev B (February 2006) 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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