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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Protective Relay Functions for Capstone MicroTurbines 4.1.3. Microturbine Under Voltage Implementation As shipped, each power controller is tested to verify that it meets both UL1741 and California Rule 21 requirements to do the following: • 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. • 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 Under Voltage protective functions are illustrated in Figure 3 and Figure 4. 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. Table 1. Under Voltage Protective Function Parameters Display Mode Grid Connect Menu RS-232 Command Parameter Description Parameter Range Default 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) in 1 Volt increments C30: 428 C65/C200: 422 UNDVLT Under Voltage Time Establishes the time period allowed for any phase voltage to fall below the Under Voltage limit. C30: 0.3 to 10 sec C65/C200: 0.01 to 300 sec Adjustable in 0.01 second increments C30: 1.90 C65/C200: 2.00 UVLTTM Fast Under Voltage The system will cease to export power to the grid if any phase voltage drops below this voltage for greater than Fast Under Voltage Time. 0 to Under Voltage (L-L) in 1 Volt increments C30: 264 C65/C200: 240 FSTUVL Fast Under Voltage Time Establishes the time period allowed for any phase voltage to fall below the Fast Under Voltage limit. C30: 0.03 to 1.00 sec C65/C200: 0.01 to 300 sec Adjustable in 0.01 second increments C30: 0.095 C65/C200: 0.100 UVFSTM 410033 Rev H (December 2013) Page 8 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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