GE Multilin F650 Digital Bay Controller 5-19
5 SETPOINTS 5.3 SYSTEM SETUP
5
5.3.2 FLEX CURVES
The relay incorporates 4 user curves called Flex Curve A, B, C and D. The points for these curves are defined by the user
in “setpoints>System Setup>Flex Curves” menu in EnerVista 650 Setup. User defined flex curves can be selected as an
operation curve in all the time overcurrent functions in the relay.
In the flex curves menu there are 120 point to define a user curve. 40 point for reset (from 0 to 0.98 times the pickup value)
and 80 for operate (from 1.03 to 20 times the pickup).
Table 5–20: FLEX CURVE SETPOINTS
The definition of the curve points can be introduced directly in the Flex Curve setpoints menu or create them using the
graphical tool provided by pressing “Edit Curve” in the Flex curves menu.
In the user curve edition screen (see Figure 5–2:), a base curve can be selected, from the Standard Curves menu, as
reference among all the curves implemented in the relay. This curve will be used as a template to create the user curve.
Once the standard curve is viewed, it is possible to make the user curve (operate, reset or both) reconcile the standard
curve, using the Flex curve > set flex curve from the standard curve, and then modifying any of the points by editing in
the table the corresponding value.
The user can also view a different curve model to the one the FlexCurve has been adapted to, and compare both models to
adopt the most appropriate values in each case. If once the user curve has been configured the user wants to store the
information, the “Flex Curve > Exit with Data” menu must be selected. If the results are not to be saved, the Exit without
Data option must be selected. Once the configured curve point values have been stored, for these values to be definitely
stored in the FlexCurve, the information must be saved in the FlexCurve general menu, by clicking on the “Store” option.
This way the selected user curve is definitely stored, so that it can be used by any of the time overcurrent elements
available in the relay.
SETPOINT > SYSTEM SETUP > FLEX CURVES
FLEX CURVES A > FLEX CURVES B> FLEX CURVES C > FLEX CURVES D
setpoint Description Name Default Value Step Range
Values for reset points 0.00 pkp Time 0.00xPKP [RST] 0.000 0.001 s [0.000 : 65.535]
Values for reset points 0.05 pkp Time 0.05xPKP [RST] 0.000 0.001 s [0.000 : 65.535]
……………
Values for reset points 0.97 pkp Time 0.97xPKP [RST] 0.000 0.001 s [0.000 : 65.535]
Values for reset points 0.98 pkp Time 0.98xPKP [RST] 0.000 0.001 s [0.000 : 65.535]
Values for operation points 1.03 pkp Time 1.03xPKP [OP] 0.000 0.001 s [0.000 : 65.535]
Values for operation points 1.05 pkp Time 1.05xPKP [OP] 0.000 0.001 s [0.000 : 65.535]
……………
Values for operation points 19.50 pkp Time 19.50xPKP [OP] 0.000 0.001 s [0.000 : 65.535]
Values for operation points 20.00 pkp Time 20.00xPKP [OP] 0.000 0.001 s [0.000 : 65.535]
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