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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Protective Relay Functions for Capstone MicroTurbines 4. Protective Functions The protective functions included in the power controller are described in this section. Voltage sensing and signal processing are illustrated in Figure 2. The Protective Function designator numbers correspond to those published by IEEE3. 4.1. Under Voltage (Protective Function 27) 4.1.1. Primary Under Voltage Trip Refer to Table 1 for the adjustable ranges and microturbine defaults for the primary under voltage settings. These settings include the under voltage trip point and the allowable time period before the voltage trip occurs. The primary voltage trip 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. 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 lower than 244 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 2 seconds when the distribution system voltage drops below 88% of generating system voltage. 4.1.2. Fast Under Voltage Trip Refer to Table 1 for the adjustable ranges and microturbine defaults for the fast under voltage settings. These settings include the fast under voltage trip point and the allowable time period before the voltage trip occurs. The fast under voltage trip point may be adjusted upwards as indicated in Table 1 and still complies with UL1741. The duration to the voltage trip may also be adjusted downwards as indicated in Table 1 and still comply with UL1741. The UL1741 requirement for this function is: • The device should cease to energize the output within 6 cycles when any of the phase voltages is lower than 139 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 seconds when the distribution system voltage drops below 50% of generating system voltage. 3 IEEE C37.90-1989. IEEE Standard relays and Relay Systems Associated with Electric Power Apparatus. Institute of Electrical and Electronics Engineers, New York. 410033 Rev H (December 2013) Page 7 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. NOTE: All protective function measurements and calculations are based on the Line-to- Neutral voltage values. However, for convenience, all protective function settings are entered as equivalent Line-to-Line voltage values.PDF Image | Technical Reference Protective Relay Functions for Capstone Microturbines
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