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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Protective Relay Functions for Capstone MicroTurbines Rate of Change of Frequency (Anti-Islanding Protective Function) The Power Controller contains integrated active anti-islanding protective functions. These include an excessive Rate of Change of Frequency protective function, which will cause a Grid Fault Shutdown. The anti-islanding protection is tested and verified as part of the UL1741 listing. Table 3. Over/Under Frequency Protective Function Parameters Display Mode Grid Connect Menu Parameter Description Parameter Value Default RS-232 Command Under Frequency If the grid frequency falls below this value for greater than Under Frequency Time, the system will shut down 45 Hz to Over Frequency 59.3 UNDFRQ Under Frequency Time Establishes the time period allowed for the Frequency to fall below the Under Frequency limit. 0.06 to 10 seconds 0.09 UFRQTM Over Frequency If the grid frequency rises above this value for greater than Over Frequency Time, the system will shut down Under Frequency to 65 Hz 60.5 OVRFRQ Over Frequency Time Establishes the time period allowed for the Frequency to rise above the Over Frequency limit. 0.06 to 10 seconds 0.09 OFRQTM Over Current and Fault Current In the Grid Connect mode, the total fault current capacity at the installation site is the sum of the fault current from the electric utility grid and that produced by all the on-site generators, including MicroTurbines. The rating of fault current interrupting devices at the site should be checked to ensure that they are capable of interrupting the total fault current available. The electric utility grid operator will usually wish to be informed of the MicroTurbine fault current contribution in order to assess the impact of the additional fault current on the electric utility grid and customers connected to it. At most installation sites the addition of a Capstone MicroTurbine may not result in a significant increase in the total fault current. However, the potential impact of the increase in fault current should be assessed. When operating in Grid Connect mode, the Power Controller operation is controlled to deliver current corresponding to the power delivery set point (but less than the nominal current limit of 46 A for the Model C30, or 105 A for the Model C60/C65). 410033 Rev. D (February 2006) Page 8 of 10 This information is proprietary to Capstone Turbine Corporation. Neither this document nor the information contained herein shall be copied, disclosed to others, or used for any purposes other than the specific purpose for which this document was delivered. Capstone reserves the right to change or modify without notice, the design, the equipment specifications, and/or the 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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