Flexcurves - GE L60 Instruction Manual

5.3 SYSTEM SETUP
a) SETTINGS
PATH: SETTINGS SYSTEM SETUP
FLEXCURVE A
5
FlexCurves™ A through D have settings for entering times to reset/operate at the following pickup levels: 0.00 to 0.98 and
1.03 to 20.00. This data is converted into two continuous curves by linear interpolation between data points. To enter a cus-
tom FlexCurve™, enter the reset/operate time (using the VALUE keys) for each selected pickup point (using the MES-
SAGE UP/DOWN keys) for the desired protection curve (A, B, C, or D).
Table 5–6: FLEXCURVE™ TABLE
RESET TIME RESET
MS
0.00
0.05
0.10
0.15
0.20
0.25
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; that is, 0.98 pu and 1.03 pu. It is recommended to set the two times to a similar value; otherwise, the lin-
ear approximation may result in undesired behavior for the operating quantity that is close to 1.00 pu.
5-60

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
L60 Line Phase Comparison Relay
FLEXCURVE A(D)
Range: 0 to 65535 ms in steps of 1
0 ms
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
5.3.5 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 Multilin
TIME
MS