Siemens 6MD86 - Page 473

[fo_reakccm, 1, en_US]
This direct-axis resistance is transferred to the other voltage controllers as a measured value via GOOSE. This
value is displayed for control. To determine the total load current, the measured current with magnitude and
phase angle is transferred as a GOOSE CMV measured value by each voltage controller.
The total load current results in:
[fo_summccm, 1, en_US]
The total inductive susceptance, the total susceptance of all transformers results in:
[fo_suszccm, 1, en_US]
The partial load current value of the individual transformers results from the ratio between susceptance and
total susceptance multiplied with the total load current. Only the inductive value, that is, the imaginary part
Im(
I
L1
) of the calculated total load current is used.
[fo_loadcurccm, 1, en_US]
The circulating reactive current at transformer k is the difference of the current measured at the transformer
and the calculated partial load current I
LkImag
. This is multiplied with -1 so that its positive no-load voltage
difference results in a positive circulating reactive current:
[fo_ccmtrafo, 1, en_US]
where:
I
LkImag
Calculated inductive part (imaginary part) of the partial load current of transformer k
I
CRCk
Circulating reactive current
I
kImag
Measured inductive part of the current at transformer k
I
k
Measured current at the transformer
X Reactance of the transformer
k 1, 2, 3, ... 8 (number of the transformer)
Calculation of the Control Deviation
The control deviation D
CRCk
is calculated from the calculated circulating reactive current I
CRCk
:
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where:
Control Functions
6.9 Voltage Controller
SIPROTEC 5, High-Voltage Bay Controller, Manual 473
C53000-G5040-C015-9, Edition 11.2017