GUID-F30E8D82-95A5-4460-AAEE-BBCD9FAD3FEB V1 EN
Figure 400:
Setpoints Successfully Written To The Control Confirmation
Screen
7.3
Voltage reduction
TCC300 allows the selection of either Standard Voltage Reduction or Smart Voltage
Reduction. Standard Voltage Reduction lowers the Bandcenter based on a percentage of
the existing Bandcenter setting. When initiated, the control immediately begins Lower
operations to reduce the voltage until it reaches the new upper band edge (Bandcenter plus
½ the Bandwidth setting). Smart Voltage Reduction will further reduce voltage using a
variety of methods .
The control allows three steps of voltage reduction initiated by external dry contacts, front
panel pushbutton or SCADA. The percentage voltage reduction at each step is adjustable
from 0 to 10% in 0.1% increments. When one or more contacts are closed, the effect is to
shift the bandcenter setpoint lower thus causing the control to lower the voltage.
In addition, voltage reduction functionality can be enabled or disabled using
Communication MODBUS® and DNP protocols.
The Voltage Reduction feature can be turned off by the Voltage Reduction Turnoff Timer
(0 to 999 min). A setting of zero disables the Turnoff Timer.
Recognize that the "effective" bandcenter may have been raised by line drop compensator
action when the voltage reduction is initiated and that the resultant voltage setting will be
the combination of the two effects. Note also that the undervoltage block setting may limit
the lowering of voltage, especially if there is little raising of the local voltage due to LDC
action.
When first initiated, or when a subsequent step of voltage reduction is needed, the control
will respond immediately to the voltage reduction command without regard to either the
intertap time delay setting or the control time delay setting. After the desired voltage
reduction, operation will revert back to normal operation with the time delay.
1VAC388793-MB A
Section 7
Setpoints
TCC300
503
User Manual
Summary of Contents for TCC300
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