ABB RELION REX640 Operation Manual page 137

1MRS759118 D
7.4.3.5 Setting system time and time synchronization
• Select Configuration > Time > System time to set the system time and time
zone.
• Select Configuration > Time > Synchronization > Synch source to set the
synchronization source.
Setting daylight saving time
The protection relay can be set to determine the correct date for the DST shift every
year. The local time is used to set the DST.
1.
2.
REX640
Operation Manual
DST on day (weekday) and DST off day (weekday) parameters to define
Set the
on which week day the time shift occurs.
DST on date (day) , DST on date (month) and DST off date (month)
Set the
parameters to define on which month and week the time shift occurs.
The DST on/off date must precede the selected DST on/off day and be within
the same week as the DST shift.
Table 27: Possible date values for DST change on Sunday
Day of the DST shift
First Sunday of the month
Second Sunday of the month
Third Sunday of the month
Fourth Sunday of the month
Last Sunday, if the month has 30 days
Last Sunday, if the month has 31 days
For example, if DST on time shift occurs on the last Sunday in March, at 03:00
local time and DST off time shift occurs on the last Sunday in October, at 04:00
local time, the settings are the following.
DST on time (hours):
DST on time (minutes):
DST on date (day):
DST on date (month):
DST on day (weekday):
DST off time (hours):
DST off time (minutes):
DST off date (day):
DST off date (month):
DST off day (weekday):
DST on day (weekday) and DST off day (weekday) to "reserved" to
Set the
determine the exact date and time for the DST shift. Repeat the setting
yearly, as the time for the DST shift is not on the same date every year.
To disable the DST, set the
DST on/off date (day)
1
8
15
22
24
25
3 h
0 min
25
March
Sunday
4 h
0 min
25
October
Sunday
DST in use parameter to "False".
Commissioning
137