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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Protective Relay Functions for Capstone MicroTurbines Table 2. Over Voltage Protective Function Parameters Display Mode RS-232 Grid Connect Menu Parameter Description Parameter Value Default Command Over Voltage If the voltage on any phase rises above this setting for greater than Over Voltage Time, the system will shut down. Under Voltage to 528 V (L-L) 524 OVRVLT Over Voltage Time Establishes the time period allowed for any phase voltage to rise above the Over Voltage limit. 0.3 to 10 seconds 1.90 OVLTTM Fast Over Voltage The system will cease to export power to the grid within 1 msec if any phase voltage rises above this voltage for greater than Fast Over Voltage Time. Over Voltage to 634 V (L-L) 600 FSTOVL Fast Over Voltage Time Establishes the time period allowed for any phase voltage to rise above the Fast Over Voltage limit. 0.03 to 1.000 seconds 0.032 OVFSTM Over/Under Frequency (Protective Function 81 O/U) The Over Frequency is adjustable from Under Frequency to 65 Hz; in 0.1 Hz increments (Default = 60.5 Hz). The time period is adjustable from 0.06 to 10.00 seconds in 0.01 second increments (Default = 0.09 seconds) The UL1741 requirement for Over Frequency function is: Thedeviceshouldceasetoenergizetheoutputwithin6cycleswhenthegrid frequency is higher than 60.5 Hz. The Under Frequency is adjustable from 45 Hz to Over Frequency, in 0.1 Hz increments. (Default = 59.3 Hz). The time period is adjustable from 0.06 to 10.00 seconds in 0.01 second increments. (Default = 0.09 seconds) The UL1741 requirement for Under Frequency function is: Thedeviceshouldceasetoenergizetheoutputwithin6cycleswhenthegrid frequency is lower than 59.3 Hz. Asshipped,eachPowerControlleristestedtoverifythatitmeetstheUL1741 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 100 ms. The Over Frequency trip limit may be adjusted downwards as indicated in Table 3 and still comply with UL1741. The Under Frequency trip limit may be adjusted upwards as indicated in Table 3 and still comply with UL1741. The duration to trip may also be adjusted downwards as indicated in Table 3 and still comply with UL1741. 410033 Rev. D (February 2006) Page 7 of 10 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 specifications, 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 | Technical Reference Protective Relay Functions for Capstone MicroTurbines
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