ABB ret650, Руководство по применению, Страница: 198 / 392

Automatic voltage control for tap changer, TR1ATCC or TR8ATCC is a function
designed to automatically maintain the voltage at the LV-side side of a power
transformer within given limits around a set target voltage. A raise or lower
command is generated whenever the measured voltage, for a given period of time,
deviates from the set target value by more than the preset deadband value (degree
of insensitivity). A time delay (inverse or definite time) is set to avoid unnecessary
operation during shorter voltage deviations from the target value, and in order to
coordinate with other automatic voltage controllers in the system.
TCMYLTC and TCLYLTC are an interface between the Automatic voltage control
for tap changer, TR1ATCC or TR8ATCC and the transformer load tap changer
itself. More specifically this means that it gives command-pulses to a power
transformer motor driven load tap changer and that it receives information from the
load tap changer regarding tap position, progress of given commands, and so on.
TCMYLTC and TCLYLTC also serve the purpose of giving information about tap
position to the transformer differential protection.
Control location local/remote
SEMOD159053-30 v3
The tap changer can be operated from the front of the IED or from a remote place
alternatively. On the IED front there is a local remote switch that can be used to
select the operator place. For this functionality the Apparatus control function
blocks Bay control (QCBAY), Local remote (LOCREM) and Local remote control
(LOCREMCTRL) are used.
Information about the control location is given to TR1ATCC or TR8ATCC
function through connection of the Permitted Source to Operate (PSTO) output of
the QCBAY function block to the input PSTO of the TR1ATCC or TR8ATCC
function block.
Control Mode
SEMOD159053-35 v4
The control mode of the automatic voltage control for tap changer function,
TR1ATCC for single control and TR8ATCC for parallel control can be:
• Manual
• Automatic
The control mode can be changed from the local location via the command menu
on the local HMI under
Main menu/Control/Commands/
TransformerVoltageControl(ATCC,90) , or changed from a remote location via
binary signals connected to the MANCTRL, AUTOCTRL inputs on TR1ATCC or
TR8ATCC function block.
Measured Quantities
SEMOD159053-61 v4
In normal applications, the LV side of the transformer is used as the voltage
measuring point. If necessary, the LV side current is used as load current to
calculate the line-voltage drop to the regulation point.
Section 11
1MRK 504 169-UEN A
Control
192 Transformer protection RET650 2.2 IEC
Application manual