ABB RELION 670 Series Applications Manual page 86

Section 6
Wide area measurement system
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
RES670 with the help of high accuracy measurements and advanced filtering techniques.
Figure 34
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.
80
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
2
1MRK 511 364-UUS A
(Equation 14)
Application manual