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Capstone Turbine Corporation Model C65 Hybrid UPS User’s Manual 2.5.1.2. Utility Voltage Utility voltage must be present and within the GLCM's utility input protective relay settings to allow the system to operate in UPS Mode or High Efficiency Mode. Conversely, loss of stable utility voltage will automatically trigger the GLCM to disconnect utility power and force the Hybrid UPS system into Emergency Mode. 2.5.1.3. Utility Reconnect Delay Once the Hybrid UPS system has been disconnected from the utility for any reason, it must go through a reconnect sequence whenever the turbine is running or has already entered a start sequence. This is a requirement of IEEE 1547, UL 1741, and most electric utilities, and is intended to prevent inadvertent energizing of an unstable utility grid. The system must wait for the utility voltage to remain within the protective relay settings for the set reconnect delay time (refer to paragraph 5.6.7) before the Hybrid UPS system can close its internal power connection to the utility grid. The GLCM is constantly monitoring the utility voltage whenever it is not in Standby Mode, and will start the reconnect delay timer whenever it senses stable conditions. Therefore, there may or may not be a state transition delay in connecting to utility power, depending on the timing of events leading up to the Hybrid UPS system attempting to reconnect to the utility grid. 2.5.1.4. UPS Mode vs. High Efficiency Mode If the system is enabled in UPS Mode, it will not try to start the turbine unless there is a grid-connect outage, which will cause a switch to Emergency Mode. If the system is enabled in High Efficiency Mode, it will always try to run the turbine unless there is some reason it cannot (such as lack of fuel). Therefore, the selected mode of operation will have an impact on what states the system transitions through to get to the desired mode. 2.5.1.5. Microturbine Start Delay Timer The Hybrid UPS systems include a turbine generator start delay timer to prevent systems operating in UPS Mode from immediately starting their engines for every utility disturbance condition. The timer is user adjustable from 0 to 10 minutes (refer to paragraph 5.5.5.2), during which time the system waits for return of stable utility voltage. If utility voltage returns to a stable condition before the end of this time, the turbine generator will not be started and the GLCM will immediately reconnect utility power. If utility voltage does not return to within the programmed GLCM protective relay limits before the end of this time, the turbine generator will be started. Once the turbine start command has been issued, the system must wait for utility voltage to return, and then pass through the utility reconnect delay sequence before reconnecting utility power to the GLCM. Page 26 of 71 400027 Rev B (August 2013) 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 | Capstone MicroTurbine Model C65 Hybrid UPS User's Manual
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