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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Application Guide: Dual Mode Fast Transfer Application Guide Normal operation is when the Utility grid is providing stable electrical power, isolation switch M1 is closed, and the C60/C65 MicroTurbine is providing power in Grid Connect mode. Figure 8 provides a schematic of the control logic used by the DMC to toggle the GC Enable, SA Enable, and Start/Stop signals. When the Utility grid experiences an undervoltage disturbance, the UVR in the Dual Mode Controller closes output relay contact RL1 in Figure 8. The auxiliary contacts M1-A3 in the motor operated isolation switch are normally open and contact M1-A4 normally closed, so the SA Enable and GC Enable signals are not yet toggled. Not shown in Figure 8 is the circuit that also uses an output command from the UVR to trip the motor operated isolation switch M1 open within about 2 seconds. When M1 opens, auxiliary contacts M1-A3 and M1-A4 toggle so that M1-A3 is now closed and M1-A4 is open (as shown in Figure 8). If the manually operated DMC switch contacts S1B and S2A are also closed, then SA Enable is activated and GC Enable is deactivated. The Start/Stop signal is also activated. This will cause the MicroTurbine to transition from Grid Connect mode to Stand Alone mode, as shown in Figure 9. Note that the use of the auxiliary contacts in the isolation switch M1 assures that the MicroTurbine will not be commanded to the Stand Alone mode unless it is isolated from the Utility grid. The complete transition from initial Utility voltage fault to Stand Alone will typically take less than 10 seconds, depending on the severity of the fault, protective relay delay settings in the MicroTurbine and the time delay in the DMC’s UVR control circuit. Figure 8. Control Circuit to Toggle GC and SA Enable Signals Once the Utility voltage has returned to normal, the UVR will open contact RL1 in Figure 8. This will inactivate the SA Enable input to the MicroTurbine, as shown in Figure 9. After a fixed one-minute delay, the MicroTurbine will automatically transition to Hot Standby mode, and the SA Load output signal will go inactive. The DMC uses the SA Load inactive signal to allow the isolation switch M1 to close. Once M1 closes, the Start/Stop signal is opened by auxiliary switch contact M1-A3 causing it to become inactive, and the GC Enable signal is activated through aux switch M1-A4 (reference Figure 8). These inputs cause the MicroTurbine to begin the reconnect sequence to Grid Connect mode while the Utility grid powers the protected load. Figure 9 shows the timeline for this sequence. Note that the total time the protected load is without normal voltage is typically less than 10 seconds after the initial Utility fault, and less than 2 seconds when the DMC transfers back to Utility Grid Connection (M1 closes). Utility faults can occur for many reasons, resulting in a variety of transient voltage conditions. The most frequent faults are sags of relatively short duration due to short circuits on the distribution network. Depending on the impedance of the short circuit and its distance from the MicroTurbine, the resulting voltage sags are often less than 1 second, and quickly return 480011 Rev B (February 2006) Page 10 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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