ABB RES670 Technical Manual page 144

Section 6
Wide area measurement system
138
requirements with a specific attention to the Total Vector Error (TVE) requirement.
The TVE is calculated using the following equation:
2
- +
( X ( n ) X ) ( X ( n ) X )
r r
=
TVE
2
+
X X
r
GUID-80D9B1EA-A770-4F50-9530-61644B4DEBBE V1 EN-US
where,
X (n) and X (n) are the measured values
r i
X and X are the theoretical values
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 35 shows an overview of the PMU functionality and operation. In this figure,
only one 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.
2
-
i i
2
i
1MRK 511 408-UUS A
Phasor measurement unit RES670 2.2 ANSI
Technical manual
(Equation 1)