Phase Current Measurement Cmmxu - ABB Relion 650 Series Technical Manual

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1MRK 511 424-UEN B

Bay control REC650 2.2 IEC

Technical manual

IEC09000038-1-EN V1 EN-US

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 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.

Phase current measurement CMMXU

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 182.

IEC09000038-1-en.vsd

SEMOD54417-261 v2

SEMOD54417-264 v7