Application and Setting Notes
If at least one of 2 parts of an electrical power system is de-energized, the parts of the electrical power system
can be connected together via the following operating modes. The above potential release conditions are
independent of one another and can also be combined.
NOTE
For reasons of safety, the releases have been deactivated in the default setting and are therefore at no.
Even if you wish to apply one of these operating modes, Siemens recommends leaving the setting at no for
reasons of safety. Set the operating mode only dynamically via the assigned binary input signal (for
example >Operating mode 'U1>U2<') (see also Figure 8-70). This prevents one of these operating
modes from being incorrectly activated statically thereby resulting in an incorrect switching.
Parameter: Close cmd. at V1< & V2>
•
Recommended setting value (_:5071:105) Close cmd. at V1< & V2> = no
Settings Description
no
No release for closing is possible via this operating mode.
yes
If part V1of the power system is de-energized and part V2 of the power
system is energized, the release for closure is given upon starting the
synchronization stage after the supervision time has passed.
The setting depends on the operational requirements. Note the above
information.
Parameter: Close cmd. at V1> & V2<
•
Recommended setting value (_:5071:106) Close cmd. at V1> & V2< = no
Settings
Description
no
No release for closing is possible via this operating mode.
yes
If part V1of the power system is energized and part V2 of the power
system is de-energized, the release for closure is given upon starting the
synchronization stage after the supervision time has passed.
The setting depends on the operational requirements. Note the above
information.
Parameter: Close cmd. at V1< & V2<
•
Recommended setting value (_:5071:107) Close cmd. at V1< & V2< = no
Settings
Description
no
No release for closing is possible via this operating mode.
yes
If the parts V1 and V2 of the power system are de-energized, the release
for closure is given upon starting the synchronization stage after the
supervision time has passed.
The setting depends on the operational requirements. Note the above
information.
Parameter: V1, V2 with voltage
•
Recommended setting value (_:5071:104) V1, V2 with voltage = 80 V
The setting value indicates the voltage above which a part of the power system (feeder or busbar) can be
regarded as activated with certainty.
You must set the value below the minimum expected operational undervoltage. Siemens therefore recom-
mends a setting value of approx. 80 % of the rated voltage. All voltages connected according to the parame-
terized measuring-point connection type are subjected to the appropriate Vmin/Vmax test.
8.4.10.2
Control Functions
8.4 Synchronization Function
1156 SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
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