[dw_V-constell-2wind-coupl-transf.vsd, 1, en_US]
Figure 6-122
Voltage-Controller Constellation for Grid Coupling Transformers
On-Load Tap Changer
On-load tap changers are used to set the desired tap of a stepped winding of the transformer while under
load. During switchover, the desired tap of the stepped winding is first selected by means of the tap selector.
Next, the on-load tap changer switches over from the current-carrying tap to the selected tap. During this
switchover, one tap of the stepped winding is briefly bridged by an ohmic resistor so that the load switchover
takes place without current interruption. Physically, the tap changer is installed in the transformer tank or in a
separate tank.
Tap Changer
The Tap changer function issues the adjusting commands to the on-load tap changer and receives the corre-
sponding feedback. The function of the tap changer inside the voltage controller corresponds to that of the
separate tap changer. The higher and lower adjusting commands are generated by the voltage controller. The
Check switching authority
,
Control model
,
SBO time-out
, and
Feedback monitoring time
parameters are set only in the voltage controller.
You can find more information in chapter
Voltage Controller
The Voltage controller function controls the voltage within the bandwidth and within the set voltage limits.
Using the
Mode
parameter, you can turn the voltage controller on or off or set it for test mode.
With the
Number of target voltage
parameter, you can specify up to 4 target voltages. You can only
activate one of these target voltages at a time using function key, communication, or a binary input. Use the
Set point mode active
parameter to specify a valid target voltage via a communication network.
If the voltage controller is switched off, adjusting commands cannot be given to the tap changer in automatic
operation or in manual operation. The set on-site or remote switching authority is independent of this.
Control Functions
6.9 Voltage Controller
456
SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017
Summary of Contents for 6MD85
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