Busbar
Protected
Object
P
Q
ANSI05000373_2_en.vsd
52
IED
ANSI05000373 V2 EN-US
Figure 540: 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.
16.1.7.3
Phase current measurement CMMXU
SEMOD54417-264 v6
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 class 0.5 measuring accuracy for internal use, on the outputs and IEC 61850.
This is achieved by magnitude 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
Phase currents (magnitude and angle) are available on the outputs and each magnitude output
has a corresponding supervision level output (Ix_RANGE). The supervision output signal is an
integer in the interval 0-4, see section
16.1.7.4
Phase-phase and phase-neutral voltage measurements VMMXU, VNMMXU
SEMOD54417-268 v5
The voltage function must be connected to three-phase voltage input in the configuration tool to
be operable. Voltages are handled in the same way as currents when it comes to class 0.5
calibrations, see above.
1MRK 502 066-UUS B
Section 16
Monitoring
1039
Technical manual
Содержание Relion 670 series
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