Carrel Precision Model T-R Series transducer (or equivalent) can be used in new
installations or to replace failed obsolete transducers. The scheme can be used with all
TCC600 Series Load Tap Changer models. This output can then be provided to a
M-2025B(D) Current Loop Interface Module and then input to a TCC300 using the
XFMR EXT #3 configuration setting.
The regulator (REG #3) setting is designed to be used with a Toshiba resistive voltage
divider.
The positive knowledge by voltage divider method (REG External #3) is used on
regulators that have +/– 16 taps, a voltage divider tap position sensor, and a separate raise/
lower output. The Tap Max and Tap Min can only be set to 16 raise and 16 lower,
respectively, while in the REG External #3 tap mode. The voltage divider method is
designed to read a tap position sensor that contains 18 resistors in a voltage divider
network. Each tap position will give a specific output voltage from the tap position sensor.
The voltage from the sensor will only be read into the TCC300 control once one (1) second
has elapsed after the counter input has toggled. The tap position sensor will not be read
again until another tap change occurs, causing the counter input to toggle once more. Also,
an external input to the control will be read to determine if a raise or lower condition exists.
The raise/lower input and the voltage from the divider network will be used to determine
what position the tap is on.
The tap position calibration must be performed at or above the 4 raise tap,
but to obtain the best accuracy, it should be calibrated at or above the 8
raise tap.
6.4.1.5
Motor Direct Drive KeepTrack
™
Motor Direct Drive KeepTrack
™
tap position knowledge for LTCs
In most Load Tap Changer applications, the TCC300 control does not directly energize
the LTC motor. Instead it energizes interposing relays which energize the motor in the
raise or lower direction.
Some LTC Transformers however, have been designed such that the control does directly
energize the motor similar to a Line or Feeder Voltage Regulator. TCC300 and later ABB
controls contain a Motor Direct Drive KeepTrack method for Line and Feeder Regulators
which may be applicable to these LTC Transformers.
Reverse Power Operation must NOT be programmed for "Regulate in
Reverse" if the "INTERNAL KEEPTRACK" method is used. Incorrect
operation will occur.
Section 6
1VAC388793-MB A
Configuration
456
TCC300
User Manual
Summary of Contents for TCC300
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