5-20 W650 Wind Generator Protection System GEK-113032A5.3 SYSTEM SETUP 5 SETTINGS55.3SYSTEM SETUPThis section shows the settings related to the system setup definition.5.3.1 GENERAL SETTINGSThis section determines the settings of the element configuration regarding its connection to the power system.Access to these settings using the EnerVista 650 Setup software is at Setpoint > System Setup > General settings.The corresponding settings are shown on the table below:Table 5–21: GENERAL SETTINGSThe system rated voltage is used as reference by the voltage restraint in the phase timed overcurrent element.The Frequency reference marks the voltage channel to which the system Frequency is measured.The auxiliary voltage setting can be selected between VN and VX.VN means that all elements using neutral voltage will take the value directly from the fourth voltage input.VX means that all elements using neutral voltage will take the value calculated from phase voltages.5.3.2 FLEX CURVESThe relay incorporates 4 user curves called Flex Curve A, B, C and D. The points for these curves are defined by the userin “Setpoint>System Setup>Flex Curves” menu in EnerVista 650 Setup. User defined flex curves can be selected as anoperation curve in all the time overcurrent functions in the relay.In the flex curves menu there are 120 points to define a user curve. 40 points for reset (from 0 to 0.98 times the pickupvalue) and 80 for operate (from 1.03 to 20 times the pickup).SETPOINT > SYSTEM SETUP > GENERAL SETTINGSsetting Description Name Default Value Step RangePhase CT ratio Phase CT Ratio 1.0 0.1 [1.0 : 6000.0]Ground CT ratio Ground CT Ratio 1.0 0.1 [1.0 : 6000.0]Sensitive ground CT ratio Stv Ground CT Ratio 1.0 0.1 [1.0 : 6000.0]Phase VT ratio Phase VT Ratio 1.0 1.0 [1.0 : 1.500.0]Phase VT connection Phase VT Connection WYE N/A [WYE – DELTA]Rated voltage Nominal Voltage 690.0 0.1 [1.0 : 850.0]Rated Frequency Nominal Frequency 50 Hz 1 Hz [50-60]Phase rotation Phase Rotation ABC N/A [ABC – ACB]Frequency reference Frequency Reference VI N/A [VI-VII-VIII]Auxiliary Voltage Auxiliary Voltage VX N/A [VX – VN]Snapshot Event generation Snapshot Events DISABLED N/A [DISABLED – ENABLED]
