5-14 BESTCOMS Software DECS-200
creates a UEL curve based on the first point setting of the absorbed, reactive power level. This function
operates in all modes except FCR.
UEL Settings, Real Power.
Up to five setting fields may be used to establish up to five real-power (kW)
points of the underexcitation limiter curve. The UEL Curve Type Selection must be set to “Customized” in
order for these setting fields to be enabled. Not all setting fields need be used. For example, entering kW
values in three of the five setting fields produces a three-point UEL curve. The range for each setting field
is based on the generator ratings entered on the Rated Data tab of the System Configuration screen.
UEL Settings, Reactive Power.
When the UEL Curve Type Selection is set to “Customized”, these five
setting fields establish the five reactive power points of the underexcitation limiter curve. Not all setting
fields need be used. For example, entering kvar values in to of the five setting fields produces a two-point
UEL curve. When the UEL curve Type Selection is set to “Internal”, only the first setting field is enabled
and a UEL curve is internally generated based on the value entered in the field. The range for each
setting field is based on the generator ratings entered on the Rated Data tab of the System Configuration
screen.
Curve points are plotted in the UEL graph as values are entered through BESTCOMS. All kW and kvar
settings can also be sent at the same time using the Send all UEL Settings to DECS button.
Internal Curve and Customized Curve Buttons.
These buttons can be clicked and held to preview the
corresponding UEL curve.
Figure 5-18. Setting Adjustments Screen, UEL Tab
SCL
Stator Current Limiter tab settings are illustrated in Figure 5-19 and described in the following paragraphs.
Stator Current Limiter, High SCL Current Level.
Configures the high-level current setpoint for the stator
current limiter. A setting of 0 to 66,000 Aac may be entered in 1.0 Aac increments.
Stator Current Limiter, High SCL Current Time.
Sets the time limit for high-level current limiting by the
stator current limiter. A setting of 0 to 60 seconds may be entered in 1 second increments.
Stator Current Limiter, Low SCL Current Level.
Configures the low-level current setpoint for the stator
current limiter. A setting of 0 to 66,000 Aac may be entered in 1 Aac increments.
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