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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Application Guide: Dual Mode Fast Transfer Application Guide In normal Grid Connect operation, the output contactor in the C60/C65 is closed and the MicroTurbine is generating power. The MicroTurbine’s generated power flows out to the remainder of the distribution circuit, and is consumed by the building loads. Normally, power is not exported to the Utility grid. In the event of a disturbance on the Utility grid, voltage and current sensing integral to the C60/C65 MicroTurbine will cause the internal contactor to open and the MicroTurbine to go through a shutdown procedure. The response time will, of course, depend on the type and severity of the disturbance and the protective relay settings in the MicroTurbine. Refer to Technical Reference 410033 for details on these protective relay functions and setpoints. With the MicroTurbine output contactor open, Utility voltage can still be sensed by the C60/C65 circuitry. When Utility voltage returns, the MicroTurbine senses it and an internal “reconnect” timer is started. UL 1741 requires that the MicroTurbine not reconnect to the grid for at least 5 minutes after the Utility voltage and frequency have been restored to the normal operating ranges. The Capstone C60/C65 provides for user adjustment of this internal reconnect timer from 5 to 30 minutes. Some local interconnection regulations may also require manual intervention before reconnecting any power source to the Utility grid. To address this case, the C60/C65 MicroTurbine firmware also provides for a manual command on the display or through the RS232 communications port. When this manual Utility reconnect control function is enabled, the MicroTurbine will reconnect to the grid as soon as a manual command has been sent to permit reconnection. Capstone’s CRMS remote monitoring software provides a user interface for issuing this manual “permission to reconnect” command. A communications command can also be transmitted through the RS232 port in the case that a PLC or other digital control equipment is used. The C60/C65 MicroTurbine display also provides for this manual reconnection using the “Start” command. When the conditions have been met to allow reconnection to the Utility grid, the MicroTurbine will automatically close its output contactor, use the Utility grid to start the MicroTurbine, and begin generating power again in Grid Connect mode. Figure 2 shows a timeline of this sequence for a typical Utility fault, followed by an outage. Utility Fault Normal Operation Fault Detection Grid Connect Utility Returns 5 - 30 min > 2 min Normal Operation Grid Connect Utility Voltage MicroTurbine Output MicroTurbine State Voltage Sensing Reconnect Time Delay 480011 Rev B (February 2006) Page 3 of 14 Warmdown Standby Startup Figure 2. Timeline of Typical Utility Fault 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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