This can be easily verified on the LTC transformer by setting the Tap Information setting
on the TCC300 Control to Motor Direct Drive KeepTrack "INTERNAL KEEPTRACK"
in the control and observing the tap position displayed in the control during both automatic
and manual tap operation in both the Raise and Lower directions. It is very important that
Reverse Power Operation NOT be programmed for "Regulate in Reverse" if this method
is used. "Regulate in Reverse" was designed for Line and Feeder Regulators which have
fixed impedances. Since LTC Transformer impedances are not predictable, incorrect
operation will occur if Reverse Power Operation is set to "Regulate in Reverse".
Motor Direct Drive KeepTrack
™
tap position knowledge for regulators
This feature is applicable to single-phase regulators only.
This feature is only applicable for ±16 tap ranges with neutral tap and
neutral indicator. The source voltage will only be applicable with a tap
range of ±16 taps.
This feature allows the control to keep track of the present tap position. The "INTERNAL
KEEPTRACK" setting is selected for this method.
Do not rely on the tap position indication on the TCC300 Tapchanger
Control display for neutral position when bypassing voltage regulators.
The motor power source for the manual, automatic, or external (SCADA) initiated tap
changes must be the same as the motor power input to the control. The operations counter
and neutral light circuit should be operational. The counter input and power source is
required for detecting tap changes and determining direction of the tap change.
Connecting a regulator neutral tap position indicating contact to the control will reset the
tap position to neutral each time the tap goes through the neutral position. It is
recommended that the indicated tap position be compared to the mechanical tap position
indicator at regular intervals, and that the indicated value be corrected, if necessary.
The tap position stored in memory is not affected by a loss of power. The tap position
record is checked and corrected to neutral, if necessary, with the closure of a neutral
contact (when the neutral tap position contact is connected to the controls).
When the Motor Direct Drive KeepTrack "INTERNAL KEEPTRACK"
tap position method is used, it must be calibrated for proper voltage
control with reverse power operation.
1VAC388793-MB A
Section 6
Configuration
TCC300
457
User Manual
Summary of Contents for TCC300
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