5-12 BESTCOMS Software DECS-200
Option 1 activates the on-line OEL settings when either the 52J/K contact or 52L/M contact is opened.
The off-line OEL settings are activated when both the 52J/K and 52L/M contacts are closed. When the
52L/M contact input is jumpered, the 52J/K input can be used to switch between the on-line OEL and off-
line OEL. If var/PF modes are disabled, a closed 52J/K contact enables AVR mode and an open 52J/K
contact enables droop compensation.
Option 2 configures the 52J/K contact to define when the off-line and on-line limiters are active. When the
52J/K contact is closed, the off-line OEL settings are active. When the 52J/K contact is open, the on-line
OEL settings are active. This configuration is intended for cross-compound generator applications where
both machines are paralleled at low rotational speed. Therefore, droop compensation needs to be active
(open 52L/M contact) as the speed of the machines is increased. However, both machines need active,
off-line overexcitation limiting protection.
Option 3 activates the on-line OEL at all times. This configuration enables the DECS-200 to operate in
AVR mode (stand-alone application) without restriction from the off-line OEL settings. The active on-line
OEL is able to limit excitation current if needed. This configuration also eliminates the need for the DECS-
200 to operate in Droop mode when applied in a single-unit application. Therefore, generator voltage
should not droop as reactive load increases.
OEL (Summing)
Summing-Point Overexcitation Limiter tab settings are illustrated in Figure 5-16 and described in the
following paragraphs.
Figure 5-16. System Settings Screen, OEL (Summing) Tab
Off-Line OEL Setting, High Current Level.
Establishes the high-level current setpoint for the off-line,
summing-point, overexcitation limiter. A setting of 0 to 30 Adc may be entered in 0.1 Adc increments.
Off-Line OEL Setting, High Current Time.
Sets the duration for the high current setpoint of the off-line,
summing-point, overexcitation limiter. A setting of 0 to 10 seconds may be entered in 1 second
increments.
Off-Line OEL Setting, Low Current Level.
Establishes the low-level current setpoint for the off-line,
summing-point, overexcitation limiter. A setting of 0 to 15 Adc may be entered in 0.1 Adc increments.
On-Line OEL Setting, High Current Level.
Establishes the high-level current setpoint for the on-line,
summing-point, overexcitation limiter. A setting of 0 to 30 Adc may be entered in 0.1 Adc increments.
On-Line OEL Setting, Medium Current Level.
Establishes the medium-level current setpoint for the on-
line, summing point, overexcitation limiter. A setting of 0 to 20 Adc may be entered in 0.1 Adc increments.
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