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CHAPTER 9 Capstone PROTECTIVE RELAY FUNCTIONS The UL1741 requirement for this function is: The device should cease to energize the output within 0.16 seconds when any of the phase voltages is lower than 139 VL-N while the other phase voltages remain at 277 VL-N As shipped, each microturbine is tested to verify that it meets the UL1741 requirement to cease power export to the grid within 160 ms if the phase-to-neutral voltage drops to 139 VL-N. The Fast Under Voltage Trip level may be adjusted upwards as indicated in Table 9-1 and still comply with UL1741. The duration to the Fast Under Voltage Trip may also be adjusted downwards as indicated in Table 9-1 and still comply with UL1741. The Under Voltage protective functions are illustrated in Figure 9-2. The under voltage trips are programmed into the microturbine as phase-to-phase voltages. Voltages indicated in Figure 9-2 are phase-to-phase voltages. However, the actual trip functions are based on phase-to-neutral voltages with equivalent trip levels. Table 9-1. Under Voltage Protective Function Parameters Display Mode Parameter Description Parameter Value Initial Factory Setting RS-232 Command to read the settings Grid Connect Menu Under Voltage If the voltage on any phase falls below this setting for greater than Under Voltage Time, the system will shut down. 352 to Over Voltage (L-L) 422 UNDVLT Under Voltage Time Establishes the time period allowed for any phase voltage to fall below the Under Voltage limit. 0.01 to 10 seconds 2.00 UVLTTM Fast Under Voltage The system will cease to export power to the grid within 1 msec if any phase voltage drops below this voltage for greater than Fast Under Voltage Time. 0 to Under Voltage (L-L) 240 FSTUVL Fast Under Voltage Time Establishes the time period allowed for any phase voltage to fall below the Fast Under Voltage limit. 0.03 to 1.00 seconds 0.16 UVFSTM 410066 Rev C (June 2009) 9-3 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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