ABB Relion 670 Series Applications Manual page 105
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1MRK 511 401-UEN Rev. K
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:
=
TVE
GUID-80D9B1EA-A770-4F50-9530-61644B4DEBBE V1 EN-US
where,
X
(n) and X
r
X
and X
r
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.
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2
-
+
-
( X ( n ) X )
( X ( n ) X )
r
r
i
2
2
+
X
X
r
i
(n) are the measured values
i
are the theoretical values
i
shows an overview of the PMU functionality and operation. In this figure, only one
© Copyright 2017 Hitachi Power Grids. All rights reserved
2
i
Wide area measurement system
IEC140000121-2-en.vsd
GUID-EB2B9096-2F9D-4264-B2D2-8D9DC65697E8 v3
Section 6
(Equation 14)
99
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