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CHAPTER 9 Capstone PROTECTIVE RELAY FUNCTIONS Over/Under Frequency (Protective Function 81 O/U) The Over Frequency is adjustable from Under Frequency to 65 Hz; in 0.1 Hz increments (Initial factory setting = 60.5 Hz). The time period is adjustable from 0.01 to 10.00 seconds in 0.01 second increments (Initial factory setting = 0.16 seconds) The UL1741 requirement for Over Frequency function is: The device should cease to energize the output within 0.16 seconds when the grid frequency is higher than 60.5 Hz. The Under Frequency is adjustable from 45 Hz to Over Frequency, in 0.1 Hz increments. (Initial factory setting = 59.3 Hz). The time period is adjustable from 0.01 to 10.00 seconds in 0.01 second increments. (Initial factory setting = 0.16 seconds) The UL1741 requirements for Under Frequency function for devices greater than 30kW rating are: The device should cease to energize the output within (adjustable 0.16 to 300 seconds) when the grid frequency is lower than (59.8 – 57.0 Hz adjustable set point). The device should cease to energize the output within 0.16 seconds when the grid frequency is lower than 57.0 Hz. As shipped, each C200 microturbine is tested to verify that it meets the UL1741 requirement to initiate a Grid Fault Shutdown, if the line frequency is greater than 60.5 Hz or is less than 59.3 Hz for a duration of 160 ms. The Over Frequency trip limit may be adjusted downwards as indicated in Table 9-3 and still comply with UL1741. The Under Frequency trip limit may be adjusted upwards as indicated in Table 9-3 and still comply with UL1741. The duration to trip may also be adjusted downwards as indicated in Table 9-3 and still comply with UL1741. 410066 Rev C (June 2009) 9-6 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 C200 MICROTURBINE TECHNICAL REFERENCE
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