Testing Of Protection Relay Operation - ABB RELION REX640 Operation Manual

Section 7
Commissioning
7.5
116
Table 22: 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):
Set the DST on day (weekday) and DST off day (weekday) to
"reserved" to 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 in use parameter to "False".

Testing of protection relay operation

The protection relay has to be in the test mode before the digital outputs and certain
output signals of protection and other functions can be activated.
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
1MRS759118 A
REX640
Operation Manual