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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Protective Relay Functions for Capstone MicroTurbines Under Voltage (Protective Function 27) Primary Under Voltage Trip The Primary Under Voltage is adjustable from 360 VL-L up to the Over Voltage set point. (Default = 428 V). The time period is adjustable from 0.3 to 10.00 seconds in 0.01 second increments. (Default = 1.90 seconds) The UL1741 requirement for this function is: Thedeviceshouldceasetoenergizetheoutputwithin2secondswhenanyofthe phase voltages is lower than 244 VL-N while the other phase voltages remain at 277 VL-N As shipped, each Power Controller is tested to verify that it meets the UL1741 requirement to initiate a Grid Fault Shutdown, if any phase-to-neutral voltage sags to less than 264 VL-N for duration greater than 2.0 seconds. The primary trip voltage set point may be adjusted upwards within the range indicated in Table 1 and still comply with UL1741. The primary duration to trip may also be adjusted downwards as indicated in Table 1 and still comply with UL1741. Fast Under Voltage Trip The Fast Under Voltage is adjustable from 0 VL-L up to the Under Voltage set point. (Default = 264V). The time period is adjustable from 0.03 to 1.000 second in 0.001 second increments. (Default = 0.095 seconds) The UL1741 requirement for this function is: Thedeviceshouldceasetoenergizetheoutputwithin6cycleswhenanyof the phase voltages is lower than 139 VL-N while the other phase voltages remain at 277 VL-N As shipped, each Power Controller is tested to verify that it meets the UL1741 requirement to cease power export to the grid within 100 ms if the voltage drops to 139 VL-N. If the grid voltage re-stabilizes to a level between the Primary Under Voltage Trip and the Primary Over Voltage Trip levels within 1.0 second of the initial Fast Under Voltage event, then the Power Controller will resume power export to the grid, otherwise a Grid Fault Shutdown is initiated. The Fast Under Voltage Trip level may be adjusted upwards as indicated in Table 1 and still complies with UL1741. The duration to the Fast Under Voltage Trip may also be adjusted downwards as indicated in Table 1 and still comply with UL1741. The Under Voltage protective functions are illustrated in Figure 3. The under voltage trips are programmed into the Power Controller as phase-to-phase voltages. Voltages indicated in Figure 3 are phase-to-phase voltages. However, the actual trip functions are based on phase-to-neutral voltages with equivalent trip levels. 410033 Rev. D (February 2006) Page 4 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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