Flexcurves - GE UR Series Instruction Manual

5.3 SYSTEM SETUP
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PATH: SETTINGS SYSTEM SETUP
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FLEXCURVE A
„
FlexCurves™ A and B have settings for entering times to Reset/Operate at the following pickup levels: 0.00 to 0.98 / 1.03
to 20.00. This data is converted into 2 continuous curves by linear interpolation between data points. To enter a custom
FlexCurve™, enter the Reset/Operate time (using the
MESSAGE keys) for the desired protection curve (A or B).
Table 5–9: FLEXCURVE™ TABLE
RESET TIME RESET
MS
0.00
0.05
0.10
0.15
0.20
0.25
5
0.30
0.35
0.40
0.45
0.48
0.50
0.52
0.54
0.56
0.58
0.60
0.62
0.64
0.66
The relay using a given FlexCurve™ applies linear approximation for times between the user-entered
points. Special care must be applied when setting the two points that are close to the multiple of pickup of
NOTE
1, i.e. 0.98 pu and 1.03 pu. It is recommended to set the two times to a similar value; otherwise, the linear
approximation may result in undesired behavior for the operating quantity the is close to 1.00 pu.
5-34
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FLEXCURVES

FLEXCURVE A TIME AT
0.00 xPKP:
TIME OPERATE
MS
0.68 1.03
0.70 1.05
0.72 1.1
0.74 1.2
0.76 1.3
0.78 1.4
0.80 1.5
0.82 1.6
0.84 1.7
0.86 1.8
0.88 1.9
0.90 2.0
0.91 2.1
0.92 2.2
0.93 2.3
0.94 2.4
0.95 2.5
0.96 2.6
0.97 2.7
0.98 2.8
L90 Line Differential Relay
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FLEXCURVE A
Range: 0 to 65535 ms in steps of 1
0 ms
VALUE keys) for each selected pickup point (using the
TIME OPERATE TIME OPERATE
MS MS
2.9
3.0
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
4.0
4.1
4.2
4.3
4.4
4.5
4.6
4.7
4.8
5 SETTINGS
5.3.7 FLEXCURVES™
TIME OPERATE
MS
4.9 10.5
5.0 11.0
5.1 11.5
5.2 12.0
5.3 12.5
5.4 13.0
5.5 13.5
5.6 14.0
5.7 14.5
5.8 15.0
5.9 15.5
6.0 16.0
6.5 16.5
7.0 17.0
7.5 17.5
8.0 18.0
8.5 18.5
9.0 19.0
9.5 19.5
10.0 20.0
GE Power Management
TIME
MS