The setting value indicates the voltage below which a part of the power system (feeder or busbar) can be
regarded as deactivated with certainty.
Siemens recommends a setting value of approx. 5 % of the rated voltage for this. All voltages connected
according to the parameterized measuring-point connection type are subjected to the appropriate Vmin/Vmax
test.
Parameter: Supervision time
•
Recommended setting value (_:5071:109) Supervision time = 0.1 s
The parameter defines a supervision time for which the above additional closing conditions have to be at least
fulfilled at de-energized switching, before the release for closing is given. In order to include transient
phenomena, Siemens recommends a value of 0.1 s.
Parameter: Direct close command
•
Recommended setting value (_:5071:108) Direct close command = no
In this operating mode, the function initiates a closing release without any testing upon start of the synchroni-
zation stage. The closure occurs immediately.
NOTE
For safety reasons, Siemens recommends leaving the setting atno. If a direct close command is necessary,
Siemens recommends only using this operating mode dynamically via the binary input signal >Op. mode
'dir.cls.cmd' (see also Figure 6-93). This prevents this operating mode from being incorrectly acti-
vated statically thereby resulting in an incorrect switching.
Direct Close Command
You can activate the operating mode direct close command statically via the Direct close command
parameter or dynamically with the binary input signal >Op. mode 'dir.cls.cmd' (see Figure 6-92).
[losyndir-140611-01.tif, 1, en_US]
Figure 6-92 Activation of the Operating Mode Direct Close Command
The operating mode Direct close command function initiates a closure release without any testing upon start
of the synchronization stage. The closure occurs immediately.
The combination Direct close command with other operating modes is not recommended, as the other oper-
ating data is bypassed.
If the synchronization function is defective (standby of the sync stage = alarm or warning), a direct close
command is executed or not executed, depending on the type of fault (see also supervisions in chapter
6.4.4.1 Description).
6.4.12
Control Functions
6.4 Synchronization Function
412 SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017
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