Application - ABB Relion 670 Series Product Manual

Phasor measurement unit RES670
Pre-configured
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.
1MRK 511 266-BEN -
CC
Station PDC
IEC11000408_1_en.eps
ABB