CHAPTER 5: SETTINGS PRODUCT SETUP
T35 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL 5-113
5
5.3.7.4 Local time
SETTINGS PRODUCT SETUP REAL TIME CLOCK LOCAL TIME
The T35 maintains two times: local time and Universal Coordinated Time (UTC). Local time can be provided by IRIG-B
signals. UTC time is provided by SNTP servers.
The real-time clock (RTC) and time stamps reported in historical records and communication protocols can be incorrect if
the Local Time settings are not configured properly.
See the IRIG-B section in the Installation chapter for guidance on these settings when using an IRIG-B source that sets the
IRIG-B control bits according to IEEE Std 1344-1995.
LOCAL TIME OFFSET FROM UTC — Used to specify the local time zone offset from UTC (Greenwich Mean Time) in hours. Time
zones in the eastern hemisphere have positive values; time zones in the western hemisphere have negative values. A value
of zero causes the relay to use UTC for local time. This setting has two uses. When the system RTC is synchronized with a
communications protocol providing only local time or it is free-running, the offset setting is used to calculate UTC from the
local time these provide. When the RTC is synchronized with a communications protocol providing only UTC (such as PTP or
SNTP), the time offset setting is used to determine local time from the UTC provided. PTP
ALTERNATE_TIME_OFFSET_INDICATOR TLVs are not used to calculate local time.
DAYLIGHT SAVINGS TIME and DST — Can be used to allow the relay to follow the DST rules of the local time zone. Note that
when IRIG-B time synchronization is active, the local time in the IRIG-B signal contains any daylight savings time offset and
so the DST settings are ignored.
5.3.8 User-programmable fault report
SETTINGS PRODUCT SETUP USER-PROGRAMMABLE FAULT REPORTS USER-PROGRAMMABLE FAULT REPORT
1(2)
LOCAL TIME
LOCAL TIME OFFSET
FROM UTC: 0.0 hr
Range: –24.0 to 24.0 hr in steps of 0.5
DAYLIGHT SAVINGS
TIME: Disabled
Range: Disabled, Enabled
DST START MONTH:
January
Range: January to December (all months)
DST START DAY:
Sunday
Range: Sunday to Saturday (all days of the week)
DST START DAY
INSTANCE: First
Range: First, Second, Third, Fourth, Last
DST START HOUR:
2:00
Range: 0:00 to 23:00 in steps of one hour
DST STOP MONTH:
January
Range: January to December (all months)
DST STOP DAY:
Sunday
Range: Sunday to Saturday (all days of the week)
DST STOP DAY
INSTANCE: First
Range: First, Second, Third, Fourth, Last
DST STOP HOUR:
2:00
Range: 0:00 to 23:00 in steps of one hour
USER-PROGRAMMABLE
FAULT REPORT 1
FAULT REPORT 1
FUNCTION: Disabled
Range: Disabled, Enabled
PRE-FAULT 1 TRIGGER:
Off
Range: FlexLogic operand
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