1MAC309294-MB F Section 3
Basic functions
RER620 51
Technical Manual
The relay can use one of two SNTP servers, the primary or the secondary server. The
primary server is mainly in use, whereas the secondary server is used if the primary server
cannot be reached. While using the secondary SNTP server, the relay tries to switch back
to the primary server on every third SNTP request attempt. If both the SNTP servers are
offline, event time stamps have the time invalid status. The time is requested from the
SNTP server every 60 seconds.
IRIG-B time synchronization requires the IRIG-B format B000/B001 with IEEE-1344
extensions. The synchronization time can be either UTC time or local time. As no reboot
is necessary, the time synchronization starts immediately after the IRIG-B sync source is
selected and the IRIG-B signal source is connected.
ABB has tested the IRIG-B with the following clock masters:
• Tekron TTM01 GPS clock with IRIG-B output
• Meinberg TCG511 controlled by GPS167
• Datum ET6000L
• Arbiter Systems 1088B
3.5 Parameter setting groups
There are four relay variant specific setting groups. For each setting group, the parameter
setting can be made independently.
The active setting group can be changed by parameter (setting groups 1...6) or via binary
input (setting groups 1...6), if a binary input is enabled for it.
To use a binary input to change setting groups use ACT (Application Configuration Tool)
to program a Hardware Channel Binary input to the Protection block.
Table 32: Active setting group binary input state
The setting group parameter is overridden when a binary input is used for changing the
active setting group.
IRIG-B time synchronization requires a COM card with an IRIG-B input.
Available only with some models.
BI state Active setting group
OFF 1
ON 2
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