ABB Relion 670 Series Applications Manual page 105

1MRK 511 401-UUS F
IEC140000121 V2 EN-US
Figure 37: Multiple instances of BINARYREPORT blocks
6.2.3 Operation principle
The Phasor Measurement Unit (PMU) features three main functional principles:
• To measure the power system related AC quantities (voltage, current) and to calculate the
phasor representation of these quantities.
• To synchronize the calculated phasors with the UTC by time-tagging, in order to make
synchrophasors (time is reference).
• To publish all phasor-related data by means of TCP/IP or UDP/IP, following the standard IEEE
C37.118 protocol.
The C37.118 standard imposes requirements on the devices and describes the communication
message structure and data. The PMU complies with all the standard requirements with a specific
attention to the Total Vector Error (TVE) requirement. The TVE is calculated using the following
equation:
( X ( n ) X )
=
TVE
GUID-80D9B1EA-A770-4F50-9530-61644B4DEBBE V1 EN-US
where,
X (n) and X
r
X and X
r i
In order to comply with TVE requirements, special calibration is done in the factory on the analog
input channels of the PMU, resulting in increased accuracy of the measurements. The IEEE C37.118
standard also imposes a variety of steady state and dynamic requirements which are fulfilled in
the IED with the help of high accuracy measurements and advanced filtering techniques.
Figure 38
instance of PMUREPORT (PMUREPORT1) is shown. Note that connection of different signals to the
PMUREPORT, in this figure, is only an example and the actual connections and reported signals on
the IEEEC37.118/1344 can be defined by the user.
Bay control REC670
Application manual
2
- + -
( X ( n ) X )
r r i i
2 2
+
X X
r i
(n) are the measured values
i
are the theoretical values
shows an overview of the PMU functionality and operation. In this figure, only one
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2
Wide area measurement system
IEC140000121-2-en.vsd
GUID-EB2B9096-2F9D-4264-B2D2-8D9DC65697E8 v3
Section 6
(Equation 14)
99