GE Multilin W650, Instruction Manual, Page: 178 / 622

5-38 W650 Wind Generator Protection System GEK-113032A
5.4 PROTECTION ELEMENTS 5 SETTINGS
5
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/Ipickup 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 > Ipickup) or the reset (for I < Ipickup) is required,
Table 5–39: 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 will be 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