Flexcurves - GE c60 Instruction Manual

SYSTEM SETUP
The switch element has direct hard-coded connections to the IEC 61850 model as shown in the logic diagram. This allows
remote open/close operation of each switch, using either CSWI or XSWI IEC 61850 logical nodes. IEC 61850 select-before-
operate functionality, local/remote switch functionality, along with blocking open/close commands are provided. Note that
the dwell time for the IEC 61850 trip and close commands shown is one protection pass only. To maintain close/open
command for a certain time, do so either on the contact outputs using the "Seal-in" setting or in FlexLogic.

5.5.6 FlexCurves

5.5.6.1 Settings
SETTINGS  SYSTEM SETUP  FLEXCURVES  FLEXCURE A(D)
 FLEXCURVE A

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
up/down keys) for the required protection curve (A, B, C, or D).
MESSAGE
Table 5-15: FlexCurve table
Reset Time
ms
0.00
0.05
5
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. Take
care 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
NOTE recommended to set the two times to a similar value, otherwise the linear approximation can result in
undesired behavior for the operating quantity that is close to 1.00 pu.
5-128
FLEXCURVE A TIME AT

0.00 xPKP:
Reset 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
Range: 0 to 65535 ms in steps of 1
0 ms
keys) for each selected pickup point (using the
VALUE
Time Operate Time
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
C60 BREAKER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS
Operate 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
Time
ms