6–62 350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
S3 PROTECTION CHAPTER 6: SETPOINTS
Figure 15: Flexcurve™ configuration settings
The following settings are available for each custom Flexcurve™.
Select Curve
Range: ANSI Moderately Inverse, ANSI Very Inverse, ANSI Extremely Inverse, IEEE Normally
Inverse, IEC Curve A, IEC Curve B, IEC Curve C, IEC Short Inverse, IAC Extreme Inv, IAC Very
Inverse, IAC Inverse, IAC Short Inverse, User Curve, FlexCurve B (Note: For FlexCurve A, you
can select FlexCurve B as the setpoint, and vice versa for FlexCurve B.)
Default: Extremely Inverse
This setting specifies a curve to use as a base for a custom FlexCurve™. Must be used
before Initialization is implemented (see Initialization below).
Multiply
Range: 0.01 to 30.00 in steps of 0.01
Default: 1.00
This setting provides selection for Time Dial Multiplier by which the times from the
inverse curve are modified. For example if an ANSI Extremely Inverse curve is selected
with TDM = 2, and the fault current was 5 times bigger than the PKP level, the operation
of the element will not occur before a time elapse of 495 ms from pickup.
Initialization
Used after specifying a curve to use as a base for a custom FlexCurve™ (see Select
Curve and Multiply above). When the Initialize FlexCurve button is clicked, the pickup
settings will be populated with values specified by the curve selected in this setting.
Courtesy of NationalSwitchgear.com
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