Basler Electric DECS-400 - Manual (Page 94)

82 9369700990 Rev R
Figure 47. Limiters Screen, Configuration Tab
OEL Voltage Dependency – dv/dt Level. This setting controls the level of voltage that triggers the OEL
Voltage Dependency function. If the Voltage Dependency function is enabled and the rate of reduction of
terminal voltage exceeds this setting, the High-Level, On-Line OEL setting is enabled. Otherwise, the
High-Level setting is disabled. This per-unit, per second setting has a range of –10.0 to 0. The setting
increment is 0.1.
UEL Mode – UEL. This setting selects either the summing point or takeover style of underexcitation
limiting.
UEL Voltage Dependency. These settings allow the adjustment of the generator voltage dependence on
the underexcitation limiter type UEL2 model from IEEE standard P421.5.
UEL Voltage Dependency – Real Power Exponent. This setting affects how the underexcitation limiter
responds to the level of generator voltage. This setting is used to apply an exponent of 0, 1, or 2 to the
generator voltage.
UEL Voltage Dependency – Real Power Filter Time Constant. This setting is used to apply the time
constant to the low-pass filter for the real power output. A setting of 0 to 20 seconds may be entered in
0.1 second increments.
Summing Point OEL
The Summing Point OEL tab has two setting groups: Primary and Secondary. The Primary and
Secondary buttons select between the primary and secondary Summing Point Overexcitation Limiter
settings. In the default logic schemes provided with the DECS-400, a contact input is used to select either
the primary or secondary Summing Point OEL settings.
Summing Point OEL tab functions are shown in Figure 48 and described in the following paragraphs.
Off-Line – High Level. This setting configures the high-level current setpoint for the summing point off-line
overexcitation limiter. A setting of 0 to 11,999 Adc may be entered in 0.01 Adc increments.
Off-Line – High Time. This setting establishes the time limit for high current limiting by the summing point
off-line overexcitation limiter. A setting of 0 to 240 seconds may be entered in 1 second increments.
Off-Line – Low Level. This setting configures the low-level current setpoint for the summing point off-line
overexcitation limiter. A setting of 0 to 11,999 Adc may be entered in 0.01 Adc increments.
BESTCOMS™ Software DECS-400