GE Power Management 750/760 Feeder Management Relay 9-
5
9 S2 SYSTEM SETUP 9.5 FLEXCURVES
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9.5 FLEXCURVES 9.5.1 DESCRIPTION
Two user programmable FlexCurves™ can be stored in the relay. These can be used for time overcurrent pro-
tection in the same manner as ANSI, IAC, and IEC curves. The custom FlexCurve™ has setpoints for entering
times to trip at the following current levels: 1.03, 1.05, 1.1 to 6.0 in steps of 0.1, and 6.5 to 20.0 in steps of 0.5.
The relay then converts these points to a continuous curve by linear interpolation between data points.
9.5.2 SETTINGS
The following table shows all the pickup levels for which a trip time must be entered.
■ FLEXCURVE A
■ [ENTER] for more
The FlexCurve A setpoints path is:
\ SETPOINTS \ S2 SYSTEM SETUP \ FLEXCURVE A
CURVE A TRIP TIME AT
1.03 x PU: 0 ms
Range: 0 to 65535 in steps of 1 ms
Enter the required trip time for the listed current level. There are eighty more
trip time settings following this one; see the table below for a complete listing.
■ FLEXCURVE B
■ [ENTER] for more
The FlexCurve B setpoints path is:
\ SETPOINTS \ S2 SYSTEM SETUP \ FLEXCURVE B
CURVE B TRIP TIME AT
1.03 x PU: 0 ms
Range: 0 to 65535 in steps of 1 ms
Enter the required trip time for the listed current level. There are eighty more
trip time settings following this one; see the table below for a complete listing.
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