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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Application Guide: Dual Mode Fast Transfer Application Guide The transition time between Grid Connect and Stand Alone modes is less than seven seconds, but will be delayed if the sensed voltage at the MicroTurbine output is maintained above 50V peak (for example by rotating machines with high inertial loads). The transfer from Grid Connect to Stand Alone operation is extremely fast, and may not necessarily provide the desired total system functionality. For example, if an external control system toggles the input signals as noted in Figure 3, but the associated isolation device has not completely disconnected from the Utility grid within the transition time of the MicroTurbine, a fault condition may exist that could damage equipment. For this reason, the operation of the input signals should assure that conditions are right for the Fast Transfer operation. Capstone’s Fast Transfer firmware allows an intentional delay time between Grid Connect and Stand Alone operation by using the SA Enable and Start/Stop inputs as shown in Figure 4. For the MicroTurbine to discontinue operation in Grid Connect mode, only the GC Enable input needs to become inactive. For transition to Stand Alone operation, both the SA Enable and the Start/Stop inputs must become active (the example shows both operating at the same time, but it is possible to have either one lead the other). Until both SA Enable and Start/Stop become active, the MicroTurbine will operate in “Hot Standby” mode for up to two hours, or until the batteries are completely recharged, whichever is longer. In this Hot Standby mode, the engine is on (flame is lit) and the output contactor is open. Power from the MicroTurbine is used to recharge the batteries, as needed, but no power is exported. Note that this “Hot Standby” mode is termed the “Stand Alone – Recharge” state in Technical Reference 410028. When the SA Enable and Start/Stop inputs become active, the MicroTurbine enters the transition state and will begin exporting power in Stand Alone mode within seven seconds. Note that if 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. < 50ms Inactive < 7s GC Enable (2 to grd) SA Enable (3 to grd) Stop Start/Stop (4 to grd) MicroTurbine Output MicroTurbine State Active Start Active Inactive Grid Connect Hot Standby Transition to Stand Alone Stand Alone Figure 4. Grid Connect to Stand Alone with Intentional Delay The above scenarios explain how an external system can use inputs to the MicroTurbine to force transition from Grid Connect to Stand Alone operation with or without intentional delay. However, the MicroTurbine itself includes built in protective relay functions that may operate before any external control system has responded. This is, in fact, the more probable scenario, and is Capstone’s recommended operating scheme. By letting the MicroTurbine 480011 Rev B (February 2006) Page 5 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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