CHAPTER 5: SETPOINTS
5.4 PROTECTION ELEMENTS
GEK-106310-AF
F650 DIGITAL BAY CONTROLLER
5-55
5.4.2.8 User curves - FlexCurves A/B/C/D
The relay incorporates 4 user curves called User Curve A, B, C and D. The points for these curves are defined by the user.
Each of the four curves has an operation characteristic (operate), defined by 80 points, and a reset characteristic, defined
by 40 points. Each point is defined as a time value for each I/I
pickup
value (number of times the pickup current) given on the
table. The user can assign values between 0 and 65.535 seconds in steps of 1 ms.
The following table details the 120 points as well as the characteristic for each of them, and a blank cell where the user can
write the time value when the operation (for I > I
pickup
) or the reset (for I < I
pickup
) is required,
Table 5-30: User curve characteristics
The two first columns (40 points) correspond to the RESET curve. The other 4 columns, with 80 points in total, correspond to
the OPERATE curve. The reset characteristic values are between 0 and 0.98, and the operation values are between 1.03
and 20.
The final curve is created by means of a linear interpolation from the points defined by the user. This is a separate process
for the RESET and the OPERATE curve.
The definition of these points is performed in a separate module from the relay, using a configuration program included in
the EnerVista 650 Setup, which incorporates a graphical environment for viewing the curve, thus making it easy for the
user to create it. This module can be accessed from the “Edit Curve” option in the FlexCurve menu, at
Setpoint > System
Setup > Flex Curves
.
RESET
(xPKP)
Time
(s)
RESET
(xPKP)
Time
(s)
OPERATE
(xPKP)
Time
(s)
OPERATE
(xPKP)
Time
(s)
OPERATE
(xPKP)
Time
(s)
OPERATE
(xPKP)
Time
(s)
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
Summary of Contents for F650
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