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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Protective Relay Functions for Capstone MicroTurbines Table 2. Over Voltage Protective Function Parameters Display Mode Grid Connect Menu RS-232 Command Parameter Description Parameter Value Default Over Voltage If the voltage on any phase rises above this setting for greater than Over Voltage time, the system will shut down. Under Voltage to 528 V (L-L) in 1 Volt increments C30: 524 C65/C200: 528 OVRVLT Over Voltage Time Establishes the time period allowed for any phase voltage to rise above the Over 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: 1.00 OVLTTM Fast Over Voltage The system will cease to export power to the if any phase voltage rises above this voltage for greater than Fast Over Voltage time. Over Voltage to 635 V (L-L) in 1 Volt increments C30: 600 C65/C200: 576 FSTOVL Fast Over Voltage Time Establishes the time period allowed for any phase voltage to rise above the Fast Over Voltage limit. C30: 0.03 to 1.00 sec C65/C200: 0.01 to 300 sec Adjustable in 0.01 second increments C30: 0.032 C65/C200: 0.03 OVFSTM 4.3. Over/Under Frequency (Protective Function 81 O/U) Refer to Table3 for the adjustable ranges and microturbine defaults for the over/under frequency settings. These settings include the frequency trip points and the allowable time period before the frequency trip occurs. The over frequency trip limit may be adjusted downwards as indicated in Table 3 and still comply with UL1741. The under frequency trip limit may be adjusted upwards as indicated in Table 3 and still comply with UL1741. The duration to trip may also be adjusted downwards as indicated in Table 3 and still comply with UL1741. The UL1741 [Rule 21] requirement for over frequency function is: • The device should cease to energize the output within 6 [10] cycles when the grid frequency is higher than 60.5 Hz. The UL1741 [Rule 21] requirement for under frequency function is: • The device should cease to energize the output within 6 [10] cycles when the grid frequency is lower than 59.3 Hz. As shipped, each power controller is tested to verify that it meets both UL1741 and California Rule 21 requirements to initiate a grid fault shutdown, if the line frequency is greater than 60.5 Hz or is less than 59.3 Hz for a duration of 100 ms. 410033 Rev H (December 2013) Page 11 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: Ensure that the over frequency and under frequency limits are set prior to setting the Power Foldback on Over Frequency parameters (paragraph 4.7). The over frequency limit must be set in order for the power foldback to work, and if the installation requires VDE-AR-N 4105 compliance, the under frequency limit must be set as specified in Table 3.PDF Image | Technical Reference Protective Relay Functions for Capstone Microturbines
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