Configuration
5-58
7SA6 Manual
C53000-G1176-C156-2
5.7 Date and Time Stamping
Integrated date and time stamping allows an exact evaluation of the sequence of
events (e.g. event logs and trip logs or limit violations). The following clock settings are
available:
• Internal RTC clock (R
eal Time Clock),
• External synchronization sources (DCF, IRIG B, SyncBox, IEC 60870-5-103),
• External minute impulses via binary input.
For the Distance Protection System with two or three 7SA6-devices connected via
protection data interface (order variant) the time usually is synchronized in only one
device, the so-called “Real-Time-Master” device; generally it is the device with index
1. It synchronizes the other device (or other devices for more than 2 ends) via the
protection communication. Thus it can be assured that all devices of the protection
system operate on the same time basis. Only in case of communication failure each
device is influenced by one of the mentioned time sychronization sources.
Time
Synchronization
Settings for time synchronization may be found in DIGSI
®
4 under Settings →
Time synchronization (Figure 5-56).
Figure 5-56 Setting Window in DIGSI
®
4 – example
Note:
The device is delivered from the factory with the internal RTC clock selected as the
time source, independent of whether the device is equipped with a SCADA interface
or not. If time synchronization is to be carried out from an external apparatus, the latter
has to be indicated.
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