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4.6.10. Active Power Foldback on Over Frequency Capstone Turbine Corporation Model C65 User’s Manual Grid Connect 2/4 Pwr OvFreq Dis 10/10 50.2 Min Freq 40 %/Hz NOTE: The Active Power Foldback on Over Frequency submenu is read only, and no settings can be changed using the display panel. This submenu displays the settings for the Active Power Foldback on Over Frequency function. These settings enable compliance with Verband der Elektrotechnik (VDE) requirements for low voltage grid connections. VDE compliance specifies fixed values for the settings, but they are adjustable (via CRMS) so that the same features can be used in various non-VDE applications as well. The submenu settings are as follows: • Pwr OvFreq Ena/Dis: This indicator displays the status of the Active Power Foldback on Over Frequency function; Dis for disabled, Ena for enabled. • Min Freq: This setting is the Minimum Frequency setpoint in Hz. When the grid frequency crosses over this setpoint, the microturbine software begins the power reduction sequence. Power reduction occurs at the rate specified by the power reduction gradient described below. For VDE compliance, the minimum frequency must be set to 50.2 Hz. • %/Hz: This setting is the Power Reduction Gradient expressed as the percentage of power reduction per Hz. The power reduction ramp occurs between the minimum frequency setting (above) and the maximum frequency. The maximum frequency is the Over Frequency setting described in paragraph 4.6.7. For VDE compliance, the power reduction gradient must be set to 40%. The delta between microturbine power output before and after the minimum frequency crossover is displayed in the Unit Data Menu (paragraph 4.8). At a power reduction gradient of 40%, for example, a microturbine output of 60 kW will be reduced by 40% after grid frequency is 1 Hz above the minimum frequency setpoint. Power output will then the 36 kW and the power reduction delta will be 24 kW. 4.7. Stand Alone Menu The top-level Stand Alone menu establishes voltage and frequency output and is applicable only when the microturbine operates in Stand Alone mode. It also establishes the operational limits for voltage and frequency, and the rates at which voltage and frequency are increased to nominal on start up (Ramp Start). These limits are usually set when the microturbine is commissioned and are not changed once set. Refer to the following reference documents as required: • Stand Alone Operation Technical Reference (410053) • Model C65 Electrical Technical Reference (410001) 400017 Rev C (February 2013) Page 53 of 69 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 | Capstone MicroTurbine Model C65 User's Manual
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