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H.9
Date Code 20081022
Instruction Manual
SEL-787 Relay
Synchrophasors
Synchrophasor Relay Word Bits
The SEL-787 automatically sets the TREA1–TREA4 or PMTRIG Relay
Word bits based on their default SEL
OGIC
equation. To change the operation
of these bits they must be programmed.
These bits may be used to send various messages at a low bandwidth via the
synchrophasor message stream. Digital Status Words may also be used to send
binary information directly, without the need to manage the coding of the
trigger reason messages in
SEL
OGIC
.
Use these Trigger Reason bits if your synchrophasor system design requires
these bits. The SEL-787 synchrophasor processing and protocol transmission
are not affected by the status of these bits.
IRIGC
Defines if IEEE C37.118 control bit extensions are in use. Control bit
extensions contain information such as Leap Second, UTC time, Daylight
Savings Time, and Time Quality. When your satellite-synchronized clock
provides these extensions your relay will be able adjust the synchrophasor
time-stamp accordingly.
➤
IRIGC := NONE will ignore bit extensions
➤
IRIGC := C37.118 will extract bit extensions and correct
synchrophasor time accordingly
Synchrophasor Relay Word Bits
and
list the SEL-787 Relay Word bits that are related to
synchrophasor measurement.
The Synchrophasor Trigger Relay Word bits in
follow the state of
the
SEL
OGIC
control equations of the same name, listed at the bottom of
. These Relay Word bits are included in the IEEE C37.118
synchrophasor data frame STAT field. See
for standard definitions
for these settings.
1
0
0
0
0x08
User
1
0
0
1
0x09
User
1
0
1
0
0x0A
User
1
0
1
1
0x0B
User
1
1
0
0
0x0C
User
1
1
0
1
0x0D
User
1
1
1
0
0x0E
User
1
1
1
1
0x0F
User
a
When PMTRIG is asserted. The terminology comes from IEEE C37.118.
Table H.6
PM Trigger Reason Bits—IEEE C37.118 Assignments
(Sheet 2 of 2)
TREA4
TREA3
TREA2
TREA1
Hexadecimal
Meaning
a
(bit 3)
(bit 2)
(bit 1)
(bit 0)
Содержание SEL-787
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