Siemens 6MD85, Руководство пользователя

Страница: 457 / 1256

You can set the voltage controller operating mode using the
Operating mode
parameter or the Operating
mode command to automatic operation or manual operation. In automatic operation, the voltage is
controlled automatically in accordance with the set parameters.
Three-Winding Transformer Voltage Controller
For the two-winding transformer voltage controller, the measurands that are used to manage the feedback
control are permanently defined.
With the voltage controller for the three-winding transformer, these measurands can be specified using one
parameter (parameter
Winding selection
=
Winding 1
or
Winding 2
) or they can be automatically
selected (
Winding selection
=
WithMaxLoad
).
The winding is automatically selected by evaluating the load current in the windings. If the load current in one
of the two windings is greater than the load current in the other winding by 5 % of the rated current for 10 s,
then the winding voltage is controlled using the larger load current.
Grid Coupling Transformer Voltage Controller
For the two-winding transformer voltage controller, the measurands that are used to manage the feedback
control are permanently defined.
With the grid coupling transformer voltage controller, these measurands can be selected using a parameter
(parameter
Winding selection
=
Winding 1
or
Winding 2
).
You can change the winding selection during operation using the settings group switching.
You can monitor the power-flow direction. If the difference in the power of
Winding 1
and
Winding 2
is
greater than 10 % of the rated power on the control side, the indication
Power-flow superv.
appears and
the function switches to alarm status.
Control Functions
6.9 Voltage Controller
SIPROTEC 5, High-Voltage Bay Controller, Manual 457
C53000-G5040-C015-9, Edition 11.2017