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Capstone Turbine Corporation Model C65 Hybrid UPS User’s Manual 2.5.3. Transitions to/from Emergency Mode Once the system is operating, loss of utility power will automatically transition the system into Emergency Mode. Loss of utility power is any condition that causes the utility grid protective relay functions to operate. The Hybrid UPS system will always attempt to power the critical load once the system has completed its start sequence, unless some condition causes a complete shutdown (for example, a severe fault on the critical load bus). Table 2 shows four possible scenarios that can occur if utility power is outside of the preset protective relay limits. Note that scenario 1 is the only condition where reconnection to the utility will occur as soon as the utility voltage is back within limits. All other scenarios involve starting a turbine or keeping a turbine running, and therefore the system must wait for the utility grid reconnect delay. While the battery state of charge will have an impact on whether the turbine is started or not, reconnection to the Utility grid does not depend on it. For systems enabled in the UPS Mode, the turbine will continue operating until battery SOC is above the preset limit before being shut down. If the battery system is provided by others, the UPS Controller may read state of charge from this external system and provide the logic and permissive signals to the Hybrid UPS microturbines to start and stop turbines as shown in Table 2. Table 2. System Transitions to/from Emergency Mode Hybrid UPS Mode Utility Loss Scenario Battery SOC Turbine Start Delay Timeout Turbine Start or Already Running Utility Reconnection Turbine Stop Wait for No Wait Wait for Battery SOC >50% Utility Voltage OK Utility Reconnect Delay 1 >50% NO NO X UPS 2 >50% YES YES X 3 <50% YESorNO YES X Hi Eff 4 ANY N/A RUNNING X X X X X X Turbine Keeps Running The normal scenario for transition to and from Emergency Mode is loss of utility voltage sensed at the incoming connection of all Hybrid UPS system in a group, with the result that all Hybrid UPS systems enter Emergency Mode. However, it is also possible that an individual Hybrid UPS system will respond to a utility grid disturbance, or detect an internal fault condition, and will automatically transition to Emergency Mode while the remaining Hybrid UPS systems stay in UPS Mode or High Efficiency Mode. This provides for maximum availability of power to the critical load bus. The individual Hybrid UPS system will then either automatically transition back to UPS or High Efficiency Mode as shown in Table 2, or if an internal fault caused the transition, will continue operating in Emergency Mode until operator intervention corrects the problem. Page 28 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. NOTE: It is possible to have one or more Hybrid UPS system in Emergency Mode while other systems are in UPS or High Efficiency Mode. Power to the critical load will be shared equally among all Hybrid UPS systems in a MultiPac, regardless of the operating mode of each individual system.PDF Image | Capstone MicroTurbine Model C65 Hybrid UPS User's Manual
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