Schweitzer Engineering Laboratories SEL-787-2 Manual page 16

16
59.996 Hz
60.003 Hz
Pullman, WA Chicago, IL Philadelphia, PA
60.015 Hz 60.0 Hz
Monterrey, Mexico San Antonio, TX
Figure 15 View of System Angle at Multiple Locations
Send synchrophasor data using IEEE C37.118-2005
protocol to SEL synchrophasor applications. These
include the SEL-3378 Synchrophasor Vector Processor
(SVP), SEL-3530 Real-Time Automation Controller
(RTAC), and the SEL-5078-2
Visualization and Analysis Software suite.
The SEL-3373 Station Phasor Data Concentrator (PDC)
and the SEL-5073
SYNCHRO
correlate data from multiple SEL-787 relays and
concentrate the result into a single output data stream.
These products also provide synchrophasor data
archiving capability. These SEL-3378 SVP enables
control applications based on synchrophasors. Directly
measure the oscillation modes of your power system and
then act on the result. Use wide-area phase angle slip and
acceleration measurements to properly control islanding
of distributed generation. With the SVP, you can
Improve Situational Awareness
Provide improved information to system operators.
Advanced synchrophasor-based tools produce a real-time
view of system conditions. Use system trends, alarm
points, and preprogrammed responses to help operators
prevent a cascading system collapse and maximize sys-
tem stability. Awareness of system trends provides opera-
tors with an understanding of future values based on
measured data.
➤
Increase system loading while maintaining adequate
stability margins.
➤
Improve operator response to system contingencies
such as overload conditions, transmission outages, or
generator shutdown.
➤
Advance system knowledge with correlated event
reporting and real-time system visualization.
➤
Validate planning studies to improve system load bal-
ance and station optimization.
SEL-787-2, -3, -4 Data Sheet
59.996 Hz
Tampa Pullman
60.007 Hz
Tampa, FL
®
WAV Central
SYNCHRO E
WAV PDC software
E
customize a synchrophasor control application according
to the unique requirements of your power system.
The data rate of SEL-787 synchrophasors is selectable
with a range of 1–60 messages per second. This
flexibility is important
communication capacity.
The SEL-787 phasor measurement accuracy meets the
highest IEEE C37.118-2005 Level 1 requirement of 1
percent total vector error (TVE). This means you can use
any SEL-787 model in an application that otherwise
would require purchasing a separate dedicated phasor
measurement unit (PMU).
Use the SEL-787 with SEL communications processors,
or the SEL-3530 RTAC, to change nonlinear state
estimation into linear state estimation. If all necessary
lines include synchrophasor measurements then state
estimation is no longer necessary. The system state is
directly measured.
V
1
V
2
= h (V,θ) + error
P
12
State
Q
12
Measurements
10 Minutes
Figure 16 Synchrophasor Measurements Turn State
Estimation Into State Measurement
Figure 17 Visualization of Phase Angle Measurements
Across a Power System
Schweitzer Engineering Laboratories, Inc.
for efficient use of
δ
1
δ
2
= h (V,θ)
V
1
State
V
2
Measurements
1 Second