8 ANSI MEDIUM VOLTAGE METAL-CLAD DIGITAL SWITCHGEAR
Voltage sender protection relays
On the protection relay LHMI go to -> Main
Menu/Configuration/Time/Synchronisation
• PTP priority 1 = 127
• PTP priority 2 = 128-255 to be different in each
protection relay
Check time synchronization status at the voltage
sender protection relay.
On the protection relay LHMI go to -> Main Menu/
Monitoring/IED status/Time synchronization
• Synch source = IEEE 1588 master
In case of Grandmaster clock (Satellite
controlled clock) failure, it is necessary to have
one protection relay defined as the Master
clock and one protection relay as the Backup
master clock. It is a matter of PTP priority
setting. Devices with a lower PTP priority 2
value become the first master clock.
Check the time synchronization status at other
protection relays.
On the protection relay LHMI go to -> Main Menu/
Monitoring/IED status/Time synchronization
• Synch source = IEEE 1588 slave
Notice: If both, Master and Backup
master clocks fails, the protection
relays establish a new primary
source for time synchronization
information automatically.
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04
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05
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06
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07
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04 PTP priority setting
for Master clock
—
05 PTP priority setting
for Slave clock
—
06 IEEE 1588 master
clock status
—
07 IEEE 1588 slave
clock status
Other protection relays
On the protection relay LHMI go to -> Main Menu/
Configuration/Time/Synchronization
• PTP priority 1 = 128
• PTP priority 2 = 128