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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Protective Relay Functions for Capstone MicroTurbines 4.2. Over Voltage (Protective Function 59) 4.2.1. Primary Over Voltage Trip Refer to Table 2 for the adjustable ranges and microturbine defaults for the primary over voltage settings. These settings include the over voltage trip point and the allowable time period before the voltage trip occurs. The primary voltage trip point may be adjusted downwards within the range indicated in Table 2 and still comply with UL1741. The primary duration to trip may also be adjusted downwards as indicated in Table 2 and still comply with UL1741. The UL1741 requirement for this function is: • The device should cease to energize the output within 2 seconds when any of the phase voltages is higher than 305 VL-N while the other phase voltages remain at 277 VL-N. The California Rule 21 requirement for this function is: • The device should cease to energize the output within 1 second when the distribution system voltage exceeds 110% of generating system voltage. 4.2.2. Fast Over Voltage Trip Refer to Table 2 for the adjustable ranges and microturbine defaults for the fast over voltage settings. These settings include the fast over voltage trip point and the allowable time period before the voltage trip occurs. The fast over voltage trip point may be adjusted downwards as indicated in Table 2 and still comply with UL1741. The duration to Fast Over Voltage Trip may also be adjusted downwards as indicated in Table 2 and still comply with UL1741. The UL1741 requirement for this function is: • The device should cease to energize the output within 2 cycles when any of the phase voltages is higher than 379 VL-N while the other phase voltages remain at 277 VL-N. The California Rule 21 requirement for this function is: • The device should cease to energize the output within 0.16 second when the distribution system voltage exceeds 120% of generating system voltage. 4.2.3. Microturbine Over 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 voltage swells to greater than 305 VL-N for duration greater than 2.0 seconds. • Cease power export to the grid within 32 ms if any phase voltage swells to 312 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 over voltage event, then the power controller will resume power export to the grid, otherwise a grid fault shutdown is initiated. The over voltage protective functions are illustrated in Figure 3 and Figure 4. The over 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 H (December 2013) Page 10 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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