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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Protective Relay Functions for Capstone MicroTurbines 4.8. Shutdown When one or more of the protective relay functions initiates a Grid Fault Shutdown, the microturbine enters the warmdown state and the following events occur: • The power controller contactor (Figure 2) is opened within 100 ms; output power flow ceases • Fuel flow to the turbogenerator stops A warm shutdown ensues during which control power is supplied from the microturbine generator as it slows down. The warmdown lasts 1-2 minutes before the rotor is stopped. The control software provides for an optional automatic restart when grid voltage and frequency are within permitted limits for a programmable period of time (from 5 to 60 minutes). When a Normal Shutdown is initiated by the Reverse Power Flow function, the microturbine enters the cooldown state and the following sequential events occur: • Fuel flow to the turbogenerator stops • A cooldown of the engine takes place lasting up to 10 minutes. (During cooldown, the grid power is used to motor the engine.) • The power controller contactor (Figure 2) is opened upon completion of cooldown. 410033 Rev H (December 2013) Page 17 of 17 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 | Technical Reference Protective Relay Functions for Capstone Microturbines
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