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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Protective Relay Functions for Capstone MicroTurbines 4.7. Power Foldback on Over Frequency The Power Foldback on Over Frequency function provides power reduction at a selected ramp rate between a minimum frequency setpoint and the Over Frequency setting. This function complies with Verband der Elektrotechnik (VDE-AR-N 4105) specifications for low voltage grid connections, and it must be activated for use in microturbines that have the appropriate software. The “minimum frequency setpoint,” i.e. crossover frequency setting, establishes the frequency, when exceeded, at which the microturbine will begin reducing power before grid frequency reaches the Over Frequency limit. The “minimum frequency setpoint” should not be confused with the Under Frequency setting described in paragraph 4.3. Both the Under Frequency and Over Frequency settings must be set to specific values in order to be VDE-AR-N 4105 compliant, as shown in Table 3. Power Foldback on Over Frequency settings are provided in Table 5. NOTE: The Power Foldback on Over Frequency settings are available for CE systems only, and they can only be applied if the turbine software is compatible. The software versions that accept power factor settings are as follows: 1. Software version 5.40 (gaseous) or 2.20 (liquid fuel) and higher for C65 microturbines. 2. Software version 1.80 (gaseous) and higher for C200 microturbines and C600/C800/C1000 turbine assemblies. NOTE: Ensure that the over frequency and under frequency limits (paragraph 4.3) are set prior to setting the Power Foldback on Over Frequency parameters. The over frequency limit must be set in order for this function to work, and if the installation requires VDE-AR-N 4105 compliance, the under frequency limit must be set as specified in Table 3. Table 5. Power Foldback on Over Frequency Parameters Display Mode Grid Connect Menu Parameter Description Parameter Value Default RS-232 Command Enable/Disable Enables and Disables Power Foldback on Over Frequency function. 0: Disabled 0 1: Enabled APSCOF Minimum Frequency Minimum Frequency setpoint in Hz. When grid frequency crosses over this setpoint, microturbine begins power reduction sequence. 0to100.0in0.1Hz increments For VDE compliance, this setting must be 50.2 Hz. 50.2 APCMNF Power Reduction Gradient Power reduction gradient expressed as percentage of power reduction per Hz. 0 to 100 in 1% increments For VDE compliance, this setting must be 40%. 40 APSCGR 410033 Rev H (December 2013) Page 16 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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