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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Protective Relay Functions for Capstone MicroTurbines The output power requirements for voltage and current including fault limits can be found in the Model C30 Electrical (410000) and Model C60/C65 Electrical (410001) Technical Reference documents. Voltage and current harmonics of the power controller conform to IEEE 519-19921 at rated power. Other Power Controller functions include: SupervisorycontroloftheMicroTurbineoperation(includingprotectiverelayfunctions) MicroTurbinesafetysupervision Fuelflowcontrolandcombustionmanagement Internalcommunicationswithauxiliaries Externalcommunicationswiththeuserandwithotherequipment Grid Connect Features When connected to an energized grid, the Power Controller inverter supplies current into the grid. Under these conditions, the Power Controller follows the prevailing grid voltage and frequency. Due to line and/or transformer impedance, the current produced by the Capstone MicroTurbine may change the voltage at the point of connection. Power delivered by the Power Controller is proportional to the product of current flow and the line voltage. The Power Controller will deliver constant power, subject to Power Controller hardware current limits, until the user initiates a control change or one of the protective relay functions described below becomes active. The algorithms used to operate the Power Controller provide excellent protection against islanding2 in the absence of utility-supplied grid voltage. Near short or near open islands are detected within a few cycles through loss of current control. Islands whose loads are more closely matched to the Power Controller output will be detected by the Rate of Change of Frequency and built-in Active Anti-Islanding protection. 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. 1 IEEE 519-1992. IEEE Recommended Practices and Requirements for Harmonic Control in Electrical Power Systems. Institute of Electrical and Electronics Engineers, New York. 2 Islanding: “A condition in which a portion of the utility system that contains both load and operating generation, which is not under utility control, remains energized while isolated from the remainder of the utility system. 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. D (February 2006) Page 3 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. NOTE 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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