Application - ABB RES670 Product Manual

Phasor measurement unit RES670 ANSI
Customized
Product version: 1.2

1. Application

WAN / LAN
GPS
satellite
RES670
GUID-13F439FC-6AB6-4ED0-A629-EBC8F984B447 V1 EN
Figure 1. PMUs in a substation
RES 670 is a Phasor Measurement Unit that provides power
system AC voltages and currents as phasors, that is as real and
imaginary parts or as magnitude and phase angle. The
reference for the phase angle is the NavStar Global Positioning
System – GPS that also supplies highly accurate time and date.
The accurate time tagging of measurements taken at different
geographical locations make it possible to derive the phasor
quantities. Based on phasors a number of power system
applications are available.
Phasor Measurement Units (PMUs) have so far been mainly
used for recording and on-line supervision of Wide Area
Measurement System (WAMS) applications. In a typical setup,
10-20 PMUs at different locations in a synchronized power
network, streams phasor data together with power flow data
and frequency, to a data concentrator.
4
Events printer
Substation LAN
C37.118
S1
S4
RES670
Printer
Gateway
S2
S3
The data concentrator is usually a mass storage with capacity
for about one week of data in a FIFO buffer. In case of any
disturbance it should be very easy to access the data recorded
to support the disturbance analysis process. The phasor data is
normally sent from the PMU to the data concentrator at a
speed of 25/30 or 50/60 samples per channel and second. The
number of sampled channels is typically 10-20. Phasor data is
normally understood as the magnitude and phase angle of the
positive sequence voltage or current. The common reference
for the angle measurement is the GPS system, which provides
precise time reference. Since every measurement sent to the
data concentrator is time tagged, any angle difference between
power system AC quantities can be derived.
1MRK511254-BUS B
CC
Station PDC
IEC11000408_1_en.eps
ABB