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3.5
Time synchronization
3.5.1
Time master supervision GNRLLTMS
3.5.1.1
Function block
GUID-52938D64-7CEC-4CFC-BBC1-04FA6860EAD1 V1 EN
Figure 18:
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
Synch source
determines the method to synchronize the real-time clock. If it
is set to “None”, the clock is free-running and the settings
Date
and
Time
can 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 but SNTP provides 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.
PTP announce mode
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 “Power Profile” mode, the TLVs
required by the IEEE C37.238-2011 Power Profile are included in announce frames.
IEEE 1588 v2 time synchronization requires a communication card with
redundancy support (COM0031...COM0037).
1MAC059074-MB A
Section 3
Basic functions
615 series ANSI
83
Technical Manual
Содержание Relion 615 series
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