GE UR T60, Instruction Manual

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5-98 T60 Transformer Protection System GE Multilin
5.4 SYSTEM SETUP 5 SETTINGS
5
5.4.7 FLEXCURVES™
a) SETTINGS
PATH: SETTINGS

SYSTEM SETUP

FLEXCURVES

FLEXCURVE A(D)
FlexCurves™ A through D have settings for entering times to reset and 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
custom FlexCurve™, enter the reset and operate times (using the VALUE keys) for each selected pickup point (using the
MESSAGE UP/DOWN keys) for the desired protection curve (A, B, C, or D).
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
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.

FLEXCURVE A

FLEXCURVE A TIME AT
0.00 xPKP: 0 ms
Range: 0 to 65535 ms in steps of 1
Table 5–8: FLEXCURVE™ TABLE
RESET TIME
MS
RESET TIME
MS
OPERATE TIME
MS
OPERATE TIME
MS
OPERATE TIME
MS
OPERATE TIME
MS
0.00 0.68 1.03 2.9 4.9 10.5
0.05 0.70 1.05 3.0 5.0 11.0
0.10 0.72 1.1 3.1 5.1 11.5
0.15 0.74 1.2 3.2 5.2 12.0
0.20 0.76 1.3 3.3 5.3 12.5
0.25 0.78 1.4 3.4 5.4 13.0
0.30 0.80 1.5 3.5 5.5 13.5
0.35 0.82 1.6 3.6 5.6 14.0
0.40 0.84 1.7 3.7 5.7 14.5
0.45 0.86 1.8 3.8 5.8 15.0
0.48 0.88 1.9 3.9 5.9 15.5
0.50 0.90 2.0 4.0 6.0 16.0
0.52 0.91 2.1 4.1 6.5 16.5
0.54 0.92 2.2 4.2 7.0 17.0
0.56 0.93 2.3 4.3 7.5 17.5
0.58 0.94 2.4 4.4 8.0 18.0
0.60 0.95 2.5 4.5 8.5 18.5
0.62 0.96 2.6 4.6 9.0 19.0
0.64 0.97 2.7 4.7 9.5 19.5
0.66 0.98 2.8 4.8 10.0 20.0
NOTE