Time Synchronization of the Line Differential Protection Measured Values with Millisecond Accuracy
The measured values of the line differential protection for the various line ends are synchronized with each
other with microsecond accuracy via the mechanisms of the protection interface. The protection interface
displays this state with the RAISING indication
Protection interface synchronized
.
If communications problems occur, it is possible that the measured values may not be properly synchronized.
In this case, the protection interface generates the CLEARED indication
Protection interface
synchronized
. The line differential protection is blocked. This state can be corrected only by manual inter-
vention.
NOTE
You can reset the synchronization of the protection interface directly in the device. Proceed as follows:
Device functions > x Device protection comm. > Protection interface y > Reset synchron.
Synchronization via GPS Second Pulse
Millisecond-accurate synchronization of the devices (1*10E-06 s), connected via protection interfaces, can
take place via a high-precision GPS second pulse at the time-synchronous port G for special differential protec-
tion applications or synchrophasor measuring devices. As a result, the transmission time of the communica-
tion route can be measured and displayed separately in the directions forward and reverse. This ensures that
the maximum responsivity can be obtained during differential protection, even if transmission times are
unbalanced in the communication networks. Different transmission times are insignificant for the transmis-
sion of protection data with a protection communication of type 2.
Initialization and Configuration of the Protection Interface in DIGSI 5
If the device is provided with modules, proceed as follows:
•
Select the desired communication module in the rear view of the device.
•
Use the Communication protocols text box to select the protection interface. A text box entitled Protec-
tion interface will then appear.
[scconfcp-241110-01.tif, 1, en_US]
Figure 3-54 Selection of the Communication Protocol
3.5.2.4
System Functions
3.5 Protection Communication
108 SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017
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