ABB RED615 Technical Manual page 740

Section 9
Control functions
734
loading state of the network. The control voltage U
equation
U U + U + U − U
=
p s z ci rsv
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U Control voltage
p
U Set voltage level
s
U Line drop compensation term
z
U Circulating current compensation term
ci
U Voltage reduction parameter
rsv
U can be directly read in the monitored data U_CTL.
p
The circulating current compensation term is calculated only in the parallel acting
operation modes "NRP" and "MCC".
Line Drop Compensation (LDC)
The line drop compensation feature is used to compensate the voltage drop along a
line or network fed by the transformer. The compensation setting parameters can
be calculated theoretically if the resistance and reactance of the line are known or
measured practically from the line drop.
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Figure 398: Equivalent electrical circuit for calculating the LDC term
The compensation parameters Line drop V Ris (U
percentage values of U
n
Band center voltage
I
L
R
L
U
B
according to the equations.
1YHT530004D05 D
is calculated according to the
p
X
L
U
L
) and Line drop V React (U
r
Technical Manual
(Equation 89)
), are
x
615 series