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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Dual Mode System Controller (DMSC) 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 Stand Alone Load Wait timer, adjustable from 0 to 30 minutes, 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 25, the microturbine continues in Stand Alone operation for 0 to 30 minutes 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 in the UCB can be programmed to indicate when the microturbine is supplying power to the load in Stand Alone mode (“SA Load” in Figure 25). 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. 0 - 30 min Inactive Stand Alone Load Wait External Control Actions Protected Load Voltage GC Enable SA Enable Start/Stop Inactive Active Start Active (Closed) 5 - 30 min Active Stop Reconnect Time Delay Hot Standby SA Load (A to B) MicroTurbine Output MicroTurbine State Inactive (Open) Stand Alone Grid Connect Page 59 of 71 Figure 25. Fast Transfer from Stand Alone to Grid Connect 410071 Rev D (January 2010) Capstone reserves the right to change or modify, without notice, the design, specifications, and/or contents of this document without incurring any obligation either with respect to equipment previously sold or in the process of construction.PDF Image | Dual Mode System Controller DMSC
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