R.7.4
SEL-421 Relay Reference Manual Date Code 20111215
Synchrophasors
Introduction
Figure 7.3 shows the SELOGIC settings for the remote relay. Set PSV64 to
indicate that the sending data are correct. These data are sent with the
synchrophasor data in the C37.118 data packet and are received by the local
relay as RTCAD16. The RTCAD16 qualification on line 11 of the local relay
(see Figure 7.2) contains this remote data quality indicator. A local relay
quality indicator also qualifies line 11.
1: PSV64 := TSOK AND PMDOK
Figure 7.3 Remote Relay SELOGIC Settings
Set the remote relay Global settings according to Figure 7.4. Set the number
of digitals (NUMDSW) to one. In this case, the SEL-421 sends SEL
OGIC
values PSV49 through PSV64 in the C37.118 data packet. This is how the
remote TSOK AND PMDOK qualification maps to the local RTCAD16 Relay
Word bit. Set the PMU application (PMAPP) to fast, because this is a
protection application. Therefore, you must choose a filter for faster response.
Also set the synchrophasor enable Global setting to yes (EPMU = Y). The
MRTCDLY and RTCRATE settings are set but not used by the remote relay.
Synchronized Phasor Measurement Settings
MFRMT := C37.118 MRATE := 60 PMAPP := F PHCOMP := Y
PMSTN := "REMOTE RTC"
PMID := 8
PHDATAV := V1 VCOMP := 0.00 PHDATAI := NA IWCOMP := 0.00
IXCOMP := 0.00 PHNR := F PHFMT := P FNR := F
NUMANA := 0 NUMDSW := 1
TREA1 := NA
TREA2 := NA
TREA3 := NA
TREA4 := NA
PMTRIG := NA
MRTCDLY := 100
RTCRATE := 60
Time and Date Management
IRIGC := C37.118
Figure 7.4 Remote Relay Global Settings
Set the local relay Global settings according to Figure 7.5. It is important for
synchrophasors to be enabled (EPMU = Y), the application to be fast
(PMAPP = F), the compensation settings to be set correctly (VCOMP,
IWCOMP, and IXCOMP), and for IRIGC = C37.118.
Set MRTCDLY for the maximum expected communication channel delay in
milliseconds. Any data arriving later than this time are rejected. The
RTCDLYA Relay Word bit indicates this condition. Use the MRTCDLY to
constrain the maximum longest operating time of the system. Set the
RTCRATE to the rate of synchrophasor data being sent by remote relay. This
is the MRATE setting on the remote relay.
The other Global settings are not relevant to this application.
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