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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Protective Relay Functions for Capstone MicroTurbines 4.4. Stand Alone to Grid Reconnect Condition The C65, C200, and C1000 series microturbine models provide protective relay functions during the transition from Stand Alone to Grid Connect mode. These protective relay functions establish parameters to specify the conditions at which the microturbine can reconnect to the grid. Refer to Table 4 for the adjustable ranges and microturbine defaults for grid reconnect condition settings. Table 4. Stand Alone to Grid Reconnect Condition Parameters Display Mode Grid Connect Menu Parameter Description Parameter Value Default RS-232 Command Minimum Grid Voltage Maximum Grid Voltage Minimum Grid Frequency Maximum Grid Frequency Minimum grid voltage at which the microturbine will connect to the grid. Maximum grid voltage at which the microturbine will connect to the grid. Minimum grid frequency at which the microturbine will connect to the grid. Maximum grid frequency at which the microturbine will connect to the grid. 480 V to Under Voltage in 1 Volt increments 480 V to Over Voltage in 1 Volt increments 60 Hz to Under Frequency in 0.1 Hz increments 60 Hz to Over Frequency in 0.1 Hz Hz increments 424 N/A 508 N/A 59.30 N/A 60.50 N/A 4.5. 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. 4.5.1. 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. It will be less than the steady state current limit as defined in the electrical specifications of each product. 410033 Rev H (December 2013) Page 13 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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