4.209
Date Code 20170814
Instruction Manual
SEL-700G Relay
Protection and Logic Functions
Global Settings (SET G Command)
IRIGC
IRIGC defines whether IEEE C37.118 control bit extensions are in use.
Control bit extensions contain information such as Leap Second, UTC time,
Daylight Saving Time, and Time Quality. When your satellite-synchronized
clock provides these extensions, your relay adjusts the synchrophasor time
stamp accordingly.
➤
IRIGC := NONE will ignore bit extensions
➤
IRIGC := C37.118 will extract bit extensions and correct
synchrophasor time accordingly
Coordinated Universal Time (UTC) Offset Setting
The SEL-700G has a Global setting UTC_OFF, settable from –24.00 to 24.00
hours, in 0.25 hour increments. The relay uses the UTC_OFF setting to
calculate local (relay) time from the UTC source when configured for Simple
Network Time Protocol (SNTP) updating via Ethernet. When a time source
other than SNTP is updating the relay time, the UTC_OFF setting is not
considered because the other time sources are defined as local time.
Automatic Daylight-Saving Time Settings
The SEL-700G can automatically switch to and from daylight-saving time, as
specified by the eight Global settings DST_BEGM through DST_ENDH. The
first four settings control the month, week, day, and time that daylight-saving
time shall commence, while the last four settings control the month, week,
day, and time that daylight-saving time shall cease.
Once configured, the SEL-700G will change to and from daylight-saving time
every year at the specified time. Device Word bit DST asserts when daylight-
saving time is active.
The SEL-700G interprets the week number settings DST_BEGW and
DST_ENDW (1–3, L = Last) as follows:
➤
The first seven days of the month are considered to be in week 1.
➤
The second seven days of the month are considered to be in
week 2.
➤
The third seven days of the month are considered to be in
week 3.
➤
The last seven days of the month are considered to be in
week “L”.
This method of counting of the weeks allows easy programming of statements
like “the first Sunday”, “the second Saturday”, or “the last Tuesday” of a month.
As an example, consider the following settings:
DST_BEGM = 3
DST_BEGW = L
DST_BEGD = SUN
DST_BEGH = 2
DST_ENDM = 10
DST_ENDW = 3
DST_ENDD = WED
DST_ENDH = 3
Summary of Contents for SEL-700G Series
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