Busbar
Protected
Object
P
Q
IEC09000038-1-en.vsd
IED
IEC09000038-1-EN V1 EN-US
Figure 203:
Internal IED directionality convention for P & Q measurements
Practically, it means that active and reactive power will have positive values when
they flow from the busbar towards the protected object and they will have negative
values when they flow from the protected object towards the busbar.
In some application, for example, when power is measured on the secondary side
of the power transformer it might be desirable, from the end client point of view, to
have actually opposite directional convention for active and reactive power
measurements. This can be easily achieved by setting parameter
PowAngComp
to
value of 180.0 degrees. With such setting the active and reactive power will have
positive values when they flow from the protected object towards the busbar.
Frequency
SEMOD54417-261 v2
Frequency is actually not calculated within measurement block. It is simply
obtained from the pre-processing block and then just given out from the
measurement block as an output.
11.1.7.3
Phase current measurement CMMXU
SEMOD54417-264 v7
The Phase current measurement (CMMXU) function must be connected to three-
phase current input in the configuration tool to be operable. Currents handled in the
function can be calibrated to get better then 0.5 class measuring accuracy for
internal use, on the outputs and IEC 61850. This is achieved by amplitude and
angle compensation at 5, 30 and 100% of rated current. The compensation below
5% and above 100% is constant and linear in between, see figure
.
1MRK 505 384-UEN A
Section 11
Monitoring
Breaker protection REQ650 2.2 IEC
423
Technical manual
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