Siemens 6MD85, Manual

Page: 475 / 1256

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Figure 6-141 Parameter in the Voltage Controller
The blockings prevent tap positions under abnormal network conditions.
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Figure 6-142 Blocking Logic
1) If transformer differential protection is available
2) If a current measurement is available
3) If parallel proxies are available (max. 7)
For a parallel control, the number of proxies used is taken into account additionally to the blockings present.
Maintenance of Transformers Connected in Parallel
If you want to take the device out of service and disconnect it from the power supply, you must first log off
the device functionally. If you log off the device functionally, all data objects generated in the device (state
and measured values) get the quality attribute
OperatorBlocked
=
TRUE
. This also applies to the output
from CFC charts.
If objects are transferred via a GOOSE message, the receiver devices can analyze the quality. After a switch off
of the transmitting device, the receiver devices detect that the transmitting device has been logged off func-
tionally and did not fail. Now, the receiving objects can automatically be set to defined states.
Table 6-29 Decommissioning
Binary input
Controllable/device display
i i
NOTE
Decommissioning the device is only allowed if the
Parallel mode
of the voltage controller is set to
No
mode
. After the decommissioning, you must commission the voltage controller again.
The decommissioning can be done with binary input indications or via the control.
Control Functions
6.9 Voltage Controller
SIPROTEC 5, High-Voltage Bay Controller, Manual 475
C53000-G5040-C015-9, Edition 11.2017