Setting Guidelines; System Time; Synchronization - Hitachi Relion 670 Series Applications Manual

Section 22
Basic IED functions
22.13.2

Setting guidelines

All the parameters related to time are divided into two categories: System time and Synchronization.
22.13.2.1

System time

The system time can be set manually via the local HMI under Main menu/Configuration/Time/System
time. The time is set with years, month, day, hour, minute, second and millisecond. In addition, there are
also settings for Day-Light-Saving and adjustment of Time-Zones.
22.13.2.2

Synchronization

The setting parameters for the real-time clock with external time synchronization are set via local HMI or
PCM600. The path for Time Synchronization parameters on local HMI is Main menu/Configuration /
Time/Synchronization . The parameters are categorized as Time Synchronization (TIMESYNCHGEN)
and IRIG-B settings (IRIG-B:1) in case that IRIG-B is used as the external time synchronization source.
Time Synchronization
The time synchronization (TIMESYNCHGEN) parameters are divided in two categories, "general" and
"IEC61850-9-2" parameters.
The general parameters are as follows:
• FineSynchSource
• SynchMaster
FineSynchSource: This parameter is used to select the time synchronization source. The options are
"Off", "GPS", "IRIG-B", or "GPS+IRIG-B". In case that both GPS and IRIG-B are used (GPS+IRIG-B) for
redundant time synchronization, the PMU will automatically select the most accurate time
synchronization source.
SynchMaster: This parameter defines if the IED shall be used as a master clock (SNTP Server) for time
synchronization within a Substation Automation System for IEDs connected on a communication network
(IEC61850-8-1). The options are "Off" or "SNTP-Server".
The IEC61850-9-2 parameters are as follows:
• SyncLostMode
• SynchAccLevel
SyncLostMode: This parameter defines the time synchronization mode when using process bus
applications (IEC61850-9-2). The options are NoBlock, Block, and BlockOnLostUTC. If the parameter is
set to Block or BlockOnLostUTC, then if the time quality is worse than the limit set by SyncAccLevel,
some functions will be blocked in the IED.
SyncAccLevel: This parameter is to define the required time synchronization accuracy for process bus
applications. The options are "Class T5 (1µs)", "Class T4 (4µs)", or "Unspecified". If it is set to
"Unspecified", the time quality will be always accepted and application functions will not be blocked due
to the time quality.
IRIG-B
The IRIG-B parameters have to be set according to the external clock providing the IRIG-B signal to the
IED. The IRIG-B parameters (IRIG-B:1) are as follows:
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