Time Synchronization; Time Master Supervision Gnrlltms - ABB RELION REC615 Technical Manual

Basic functions
Name Type
Programmable LED 9 Enum
Programmable LED 10 Enum
Programmable LED 11 Enum
3.5

Time synchronization

3.5.1

Time master supervision GNRLLTMS

3.5.1.1 Function block
Figure 20: Function block
3.5.1.2 Functionality
The protection relay has an internal real-time clock which can be either free-running
or synchronized from an external source. The real-time clock is used for time
stamping events, recorded data and disturbance recordings.
The protection relay is provided with a 48 hour capacitor backup that enables the
real-time clock to keep time in case of an auxiliary power failure.
The setting
If it is set to "None", the clock is free-running and the settings
be used to set the time manually. Other setting values activate a communication
protocol that provides the time synchronization. Only one synchronization method
can be active at a time. IEEE 1588 v2 and SNTP provide time master redundancy.
The protection relay supports SNTP, IRIG-B, IEEE 1588 v2, DNP3 and Modbus to
update the real-time clock. IEEE 1588 v2 with GPS grandmaster clock provides the
best accuracy ±1 µs. The accuracy using IRIG-B and SNTP is ±1 ms.
The protection relay's 1588 time synchronization complies with the IEEE
C37.238-2011 Power Profile, interoperable with IEEE 1588 v2. According to the power
profile, the frame format used is IEEE 802.3 Ethernet frames with 88F7 Ethertype
as communication service and the delay mechanism is P2P.
determines the format of PTP announce frames sent by the protection relay when
acting as 1588 master, with options "Basic IEEE1588" and "Power Profile". In the
70
Values (Range)
0=None
1=Ok
3=Alarm
0=None
1=Ok
3=Alarm
0=None
1=Ok
3=Alarm
Synch source determines the method to synchronize the real-time clock.
Unit Description
Status of programma-
ble LED 9
Status of programma-
ble LED 10
Status of programma-
ble LED 11
Date and Time can
PTP announce mode
1MRS758755 C
REC615 & RER615
Technical Manual