18.18
SEL-400 Series Relays Instruction Manual Date Code 20171006
Synchrophasors
Synchrophasor Quantities
Synchrophasor Quantities
Relay Word Bits
This subsection describes the Relay Word bits that are related to synchrophasor
measurement.
The Synchrophasor Trigger Relay Word bits in Table 18.7 follow the state of the
SEL
OGIC control equations of the same name. These Relay Word bits are
included in the IEEE C37.118 synchrophasor data frame STAT field. See
Table 18.6 for standard definitions for these settings.
The Time-Synchronization Relay Word bits in Table 18.8 indicate the present sta-
tus of the high-accuracy timekeeping function of the relay.
Table 18.6 User-Defined Digital Status Words Selected by the NUMDSW Setting
NUMDSW Setting Digital Status Words Sent
Tota l N umber of Bytes
Used for Digital Values
0None 0
1 [PSV64, PSV63 … PSV49] 2
2 [PSV64, PSV63 … PSV49]
[PSV48, PSV47 … PSV33]
4
3 [PSV64,PSV63 … PSV49]
[PSV48,PSV47 … PSV33]
[PSV32,PSV31 … PSV17]
6
4 [PSV64,PSV63 … PSV49]
[PSV48,PSV47 … PSV33]
[PSV32,PSV31 … PSV17]
[PSV16,PSV15 … PSV01]
8
Table 18.7 Synchrophasor Trigger Relay Word Bits
Name Description
PMTRIG Trigger (SELOGIC control equation)
TREA4 Trigger Reason Bit 4 (SEL
OGIC control equation)
TREA3 Trigger Reason Bit 3 (SEL
OGIC control equation)
TREA2 Trigger Reason Bit 2 (SEL
OGIC control equation)
TREA1 Trigger Reason Bit 1 (SEL
OGIC control equation)
Table 18.8 Time-Synchronization Relay Word Bits
Name Description
TIRIG Asserts while relay time is based on IRIG-B time source.
PTP Synchronized to a PTP source.
TSOK Time synchronization OK. Asserts while time is based on high-accuracy
IRIG-B or PTP time source (HIRIG or HPTP mode) of sufficient accuracy
for synchrophasor measurement.
PTPSYNC Asserts while the relay is synchronized to a high-quality PTP time source.
PMDOK Phasor measurement data OK. Asserts when the relay is enabled and syn-
chrophasors are enabled (Global setting EPMU := Y).
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