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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Application Guide: Dual Mode Fast Transfer Application Guide respond directly to a Utility fault, the protected loads may actually have more continuity of power if they are not automatically transferred to Stand Alone mode. Figure 5 shows operation of the MicroTurbine from Grid Connect to Stand Alone, where the MicroTurbine initiates the transfer. For simplicity of explanation, the example shows a drop in Utility voltage as the fault. Of course, it could be other fault conditions that cause this operation, such as over or under frequency, over voltage, or anti-islanding protection. Utility Fault External Control Actions < 7 s Inactive Active Start Transition to Stand Alone Normal Active Inactive Fault Utility Voltage GC Enable (2 to grd) SA Enable (3 to grd) Stop Start/Stop (4 to grd) MicroTurbine Output MicroTurbine State Fault Detection Grid Connect Hot Standby Stand Alone Figure 5. Grid Connect to Stand Alone Initiated by MicroTurbine In this case, the MicroTurbine reacts to the fault first, with the external control system toggling the GC Enable, SA Enable, and Start/Stop inputs thereafter. The time delay is controlled by the external system, however there are some conditions that must be considered for this control action. While the GC Enable is active, the MicroTurbine will automatically start its internal reconnect sequence and prepare to reconnect to the Utility grid. During this process, the MicroTurbine will look for presence of stable Utility voltage at its terminals (just as described in the Grid Connect only operation above). As soon as Utility voltage is sensed, the MicroTurbine will start its reconnect timer. If GC Enable is not deactivated prior to reaching the set reconnect time delay (or activation of any manual reconnect controls), the MicroTurbine will automatically resynchronize with and reconnect to the Utility grid. If there is no Utility grid present, the MicroTurbine will continue in Hot Standby mode for up to two hours, waiting for the presence of Utility voltage prior to starting its reconnect time delay sequence. Note that if normal Utility voltage does not return, or a valid control input is not received, before the MicroTurbine completes its Hot Standby timeout, the MicroTurbine will shut down and remain in normal Standby until valid control inputs tell it to restart in Grid Connect or Stand Alone mode. Note that there are two possible scenarios in the transition out of Grid Connect mode: 1. An external control system forces the transition from Grid Connect to Stand Alone, with or without the MicroTurbine responding directly to a Utility fault condition, or 480011 Rev B (February 2006) Page 6 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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