Sel SEL-787 - Synchrophasor Relay Word Bits

H.9
Date Code 20150130 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
SELOGIC.
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-
Saving 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
Table H.7 and Table H.8 list the SEL-787 Relay Word bits that are related to
synchrophasor measurement.
The Synchrophasor Trigger Relay Word bits in Table H.7 follow the state of
the
SELOGIC control equations of the same name, listed at the bottom of
Table H.1. These Relay Word bits are included in the IEEE C37.118
synchrophasor data frame STAT field. See Table H.5 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)