Schweitzer Engineering Laboratories SEL-787 - Page 514

H.6
SEL-787 Relay Instruction Manual Date Code 20081022
Synchrophasors
Settings for Synchrophasors
PHDATAV and VCOMP
PHDATAV selects which voltage synchrophasors to include in the data packet.
Consider the burden on your synchrophasor processor and offline storage
requirements when deciding how much data to transmit. This setting is one of
six settings that determine the minimum port SPEED necessary to support the
synchrophasor data packet rate and size—see Communications Bandwidth on
page H.12 for detailed information.
➤ PHDATAV := V1 will transmit only positive-sequence voltage,
V
1
➤ PHDATAV := ALL will transmit V
1
, V
A
, V
B
, and V
C
➤ PHDATAV := NA will not transmit any voltages
Table H.3 describes the order of synchrophasors inside the data packet.
The VCOMP setting allows correction for any steady-state voltage phase
errors (from the potential transformers or wiring characteristics). See
Synchrophasor Measurement on page H.2 for details on this setting.
PHDATAI, PHCURR, IW1COMP, and IW2COMP
PHDATAI and PHCURR select which current synchrophasors to include in
the data packet. Consider the burden on your synchrophasor processor and
offline storage requirements when deciding how much data to transmit. These
settings are two of the sixsettings that determine the minimum port SPEED
necessary to support the synchrophasor data packet rate and size—see
Communications Bandwidth on page H.12 for detailed information.
➤ PHDATAI := I1 will transmit only positive-sequence current, I
1
➤ PHDATAI := ALL will transmit I
1
, I
A
, I
B
, and I
C
for the
Windings selected by PHCURR
➤ PHDATAI := NA will not transmit any currents
PHCURR selects the source current(s) for the synchrophasor data selected by
PHDATAI.
➤ PHCURR := IW1 uses the currents measured on the IAW1,
IBW1, and ICW1 inputs
➤ PHCURR := IW2 uses the currents measured on the IAW2,
IBW2, and ICW2 inputs
➤ PHCURR:= BOTH uses the currents measured on both the
I_W1 inputs and I_W2 inputs
Table H.3 describes the order of synchrophasors inside the data packet.
The IW1COMP and IW2COMP settings allow correction for any steady-state
phase errors (from the current transformers or wiring characteristics). See
Synchrophasor Measurement on page H.2 for details on these settings.