Schweitzer Engineering Laboratories SEL-751 - Table I.2 Synchrophasor Order in Data Stream (Voltages and Currents)

I.6
SEL-751 Relay Instruction Manual Date Code 20170927
Synchrophasors
Settings for Synchrophasors
Table I.2 describes the order of synchrophasors inside the data packet.
The VCOMP and VSCOMP settings allow correction for any steady-state
voltage phase errors (from the potential transformers or wiring
characteristics). See Synchrophasor Measurement on page I.2 for details on
this setting.
PHDATAI and ICOMP
PHDATAI selects 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. This setting is one of
the seven settings that determine the minimum port SPEED necessary to
support the synchrophasor data packet rate and size—see Communications
Bandwidth on page I.15 for detailed information.
➤ PHDATAI := I1 transmits only positive-sequence current, I
1
➤ PHDATAI := ALL transmits I
1
, I
A
, I
B
, I
C
, and I
N
➤ PHDATAI := NA does not transmit any currents
The ICOMP setting allows correction for any steady-state phase errors (from
the current transformers or wiring characteristics). See Synchrophasor
Measurement on page I.2 for details on these settings.
Table I.2 describes the order of synchrophasors inside the data packet.
Synchrophasors are transmitted in the order indicated from the top to the
bottom of the table. Real values are transmitted first and imaginary values are
transmitted second.
Synchrophasors are only transmitted if specified to be included by the
PHDATAV and PHDATAI settings. For example, if PHDATAV := ALL and
PHDATAI := I1, selected phase voltages are transmitted first (See PHVOLT
setting), followed by VS input voltage, positive-sequence voltage, and
positive-sequence current.
Table I.2 Synchrophasor Order in Data Stream (Voltages and Currents)
Synchrophasors
abc
a
Synchrophasors are included in the order shown (for example, voltages, if selected, always
precede currents).
b
Synchrophasors are transmitted as primary values. Relay settings CTR, CTRN, PTR, PTRS
are used to scale the values.
c
When PHDATAV := ALL and DELTA_Y := WYE, phase voltages VA, VB, and VC are transmitted.
Phase voltages VAB, VBC, and VCAX are transmitted when DELTA_Y := DELTA.
Included When Global Settings Are as Follows:
Rectangular
Real Imaginary
V1 V1 PHDATAV := V1 or ALL
VA VA
VB VB PHDATAV := ALL
VC VC
VS VS
I1 I1 PHDATAI := I1 or ALL
IA IA
IB IB PHDATAI := ALL
IC IC
IN IN