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PRELIMINARY Protective Relay Settings Protective Relay Settings establish voltage and frequency operating limits for the Capstone 60. The range of these adjustments are based on what the Capstone 60 hardware can tolerate. The settings are adjustable to allow the user to narrow or restrict the operating envelope to local regulatory requirements. The under voltage and over voltage functions are currently applicable to Grid Connect only, however the settings are unique and must be established for the Grid Connect mode. The settings for Grid Connect are found in submenus in the Grid Connect top-level menu. The Fast Overvolts and Fast Undervolts functions are applicable only to the Grid Connect mode. Grid Connect Protective Relay Functions Utilities commonly require that protective relaying devices be installed with generators connected to their grids. The primary purpose of these devices is to ensure that utility wires de-energized by the utility will not be energized by the local generator. Historically, these protective relaying devices have been dedicated relays or dedicated solid state power analyzers that provide control signals to disconnecting relays. The Capstone 60 has protective relaying functions built in. The algorithms used to operate the Capstone 60 provide excellent protection against islanding of the unit in the absence of utility-supplied grid voltage. Near short or near open islands are detected within milliseconds through loss of current control. Islands whose loads are more closely matched to the Capstone 60 output will be detected through one or more of the following protective functions: Under Voltage, Over Voltage, Over/Under Frequency, or Rate of Change of Frequency. When a Grid Fault Shutdown is initiated by one or more of the protective functions described below, the following events occur: • Output power flow ceases within 1 msec • The power output contactor is opened within 100 msec • Fuel flow to the MicroTurbine ceases A warm shutdown ensues during which control power is supplied from the Capstone 60 as it slows down. The warm-down lasts 1 to 2 minutes before the rotor is stopped. The control software does not allow a restart until grid voltage and frequency are within permitted limits. Configuring the System A4 511519-001PDF Image | C60 Mech
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