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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Protective Relay Functions for Capstone MicroTurbines Table of Contents 1. Introduction ...........................................................................................................................4 2. Power Controller Operation Overview ...................................................................................5 2.1. Power Controller Components and Function................................................................6 3. Grid Connect Features ..........................................................................................................6 4. Protective Functions..............................................................................................................7 4.1. Under Voltage (Protective Function 27) .......................................................................7 4.1.1. Primary Under Voltage Trip .............................................................................7 4.1.2. Fast Under Voltage Trip ..................................................................................7 4.1.3. Microturbine Under Voltage Implementation....................................................8 4.2. Over Voltage (Protective Function 59) .......................................................................10 4.2.1. Primary Over Voltage Trip .............................................................................10 4.2.2. Fast Over Voltage Trip ..................................................................................10 4.2.3. Microturbine Over Voltage Implementation....................................................10 4.3. Over/Under Frequency (Protective Function 81 O/U) .................................................11 4.4. Stand Alone to Grid Reconnect Condition ..................................................................13 4.5. Rate of Change of Frequency (Anti-Islanding Protective Function) ............................13 4.5.1. Over Current and Fault Current.....................................................................13 4.6. Reverse Power Flow (Protective Function 32)............................................................14 4.6.1. Power Meter with Pulse Outputs ...................................................................15 4.6.2. Power Meter with Modbus Output .................................................................15 4.6.3. Reverse Power Relay with Trip Signal...........................................................15 4.7. Power Foldback on Over Frequency (C65 CE only)...................................................16 4.8. Shutdown ...................................................................................................................17 List of Figures Figure 1. Capstone Microturbine Grid Connect System Configuration........................................ 4 Figure 2. Capstone Microturbine – Functional Block Diagram for C30, C65 and C200 Models .. 5 Figure 3. Grid Fault Shutdown Trip Limits for Over/Under Voltage Events (C65/C200) .............. 9 Figure 4. Grid Fault Shutdown Trip Limits for Over/Under Voltage Events (C30) ....................... 9 List of Tables Table 1. Under Voltage Protective Function Parameters............................................................ 8 Table 2. Over Voltage Protective Function Parameters.............................................................11 Table 3. Over/Under Frequency Protective Function Parameters .............................................12 Table 4. Stand Alone to Grid Reconnect Condition Parameters................................................13 Table 5. Power Foldback on Over Frequency Parameters ........................................................16 410033 Rev H (December 2013) Page 3 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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