GE B30 Instruction Manual page 199

5 SETTINGS
offset possibly greater than 10 µs from the international time standard, the CLOCK UNSYNCHRONIZED FlexLogic oper-
and is activated.
The
SYNCHRONIZING SOURCE
ures the priority sequence of the time synchronization source, to determine which of the available external time sources to
use for time synchronization. A setting of None causes the RTC and the synchrophasor clock to free-run until the clock is
changed from the front panel or from communications protocols. A setting of PP/IRIG-B/PTP/SNTP, IRIG-B/PP/PTP/SNTP,
or PP/PTP/IRIG-B/SNTP causes the relay to track the first source named that is enabled and operational, or free-run if
none of these are available. Here, PP means a time source that is strictly compliant with PP, and PTP means a time source
that is not strictly compliant with PP. When a time source fails or recovers, the relay automatically transfers synchronization
as required by this setting.
When the relay does not have the IEEE 1588 software option and this setting does not display, it uses IRIG-B when
enabled and operational, then failing that SNTP when configured and operational, and otherwise it free-runs unless the
clock is changed from the front panel or from communications protocols.
Whenever a time synchronization message is received through any of the active protocols, the UR clock updates. However,
given that IEC 60870-5-103, IEC 60870-5-104, Modbus, and DNP are low accuracy time synchronization methods, avoid
their use for synchronization when better accuracy time protocols, such as IRIG-B and PTP, are active in the system.
See the 
COMMANDS SET DATE AND TIME
The
REAL TIME CLOCK EVENTS
records the RTC time before the adjustment. A Date/Time Changed event is generated when:
• The real time clock changed from SNTP/PTP/IRIG-B and the time difference is more than one second
• The real time clock changed from the front panel or via Modbus register. The relay always generates this event regard-
less of the time difference.
• The Daylight Saving Time (DST) setting gets enabled and the current relay time is already in the DST zone
• The real time clock enters or leaves DST
To enable IRIG-B synchronization, the input
synchronization can be disabled by making this setting None.
To configure and enable PTP and/or SNTP, or to set local time parameters (for example time zone, daylight savings), use
the following sections.
b) PRECISION TIME PROTOCOL (1588)

PATH: SETTINGS PRODUCT SETUP
 PRECISION TIME
 PROTOCOL (1588)
MESSAGE
MESSAGE
MESSAGE
MESSAGE
GE Multilin
setting displays when the relay includes the IEEE 1588 software option. The setting config-
menu section of this manual to manually set the RTC.
setting allows changes to the date and/or time to be captured in the event record. The event
IRIG-B SIGNAL TYPE
 
REAL TIME CLOCK
STRICT POWER PROFILE:
Disabled
PTP DOMAIN NUMBER
0
PTP VLAN PRIORITY
4
PTP VLAN ID
0
 PTP PORT 1

B30 Bus Differential System
must be set to DC Shift or Amplitude Modulated. IRIG-B
PRECISION TIME PROTOCOL (1588)
Range: Enabled, Disabled
Range: 0 to 255
Range: 0 to 7
Range: 0 to 4095
5.2 PRODUCT SETUP
5
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