ABB Relion RES670, Applications Manual

Page: 33 / 382

Section 2 Application
2.1 General IED application
GUID-CF75762E-73C1-40AF-8D6F-6EC3D8395982 v4
RES670 is a Phasor Measurement Unit (PMU) that provides power system AC
voltages and currents as phasors for all voltage levels in power system networks.
Phasors are provided as real and imaginary or as magnitude and phase angle. The
reference for the phase angle may be either a PTP time synchronization source or
the NavStar Global Positioning System - GPS, both supplying highly accurate time
and date. The measured data in each PMU is time synchronized via one of the
mentioned time synchronization sources - with an accuracy of one microsecond -
and transmitted to Phasor Data Concentrators (every 100 milliseconds, for
example). The accurate time tagging of measurements taken at different
geographical locations makes it possible to derive the synchronized phasor
quantities (synchrophasors). Based on synchrophasors, a number of power system
applications are available.
The PMUs are installed at substation level, and can be connected directly to the
current and voltage transformers within the substations. Each RES670 may be
fitted with different options for time synchronization: PTP via the Ethernet
network, via the GPS system with an own antenna for the RES670, or via the
IRIG-B signal received from an external GPS-based clock. It is also possible to
have a combination of the three to provide time synchronization redundancy for the
PMU. RES670 streams out its synchrophasor data according to IEEE C37.118
and/or IEEE 1344 standards for synchrophasor data streaming and with user-
selectable reporting rates. RES670 supports reporting rates of 10, 25, 50, 100, and
200 frames per second for 50Hz system (or 10, 12, 15, 30, 60, 120, and 240 frames
per second for 60Hz system). Each RES670 can communicate its synchrophasor
data to up to eight independent clients over TCP and/or six independent UDP
channels (unicast/multicast), simultaneously. More information is available in
RES670 Application Manual under
Wide Area Measurement System . section.
In addition to the synchrophasor communication standard (IEEE 1344, IEEE
C37.118), RES670 is also compliant to IEC 61850-8-1 standard for integration to
substation automation systems and exchange of GOOSE messages, when
necessary. RES670 is able to communicate over IEC 62439-3 PRP for redundant
station bus communication for both IEEE C37.118 and IEC 61850-8-1,
simultaneously.
Figure 2 shows an example of a system architecture for a Wide Area Monitoring
System (WAMS). PMUs are the building blocks for a WAMS. The architecture of a
WAMS consists of the following main components:
1MRK 511 407-UEN C
Section 2
Application
Phasor measurement unit RES670 2.2 IEC 27
Application manual