ABB RET670 Applications Manual page 558

Section 3
IED application
552
Set value for parameter
"VoltageInput"
-NegSeq
5
-3*ZeroSeq
6
MaxPh
7
MinPh
8
UnbalancePh
9
PhaseA - PhaseB
10
PhaseB - PhaseC
11
PhaseC - PhaseC
12
MaxPh-Ph
13
MinPh-Ph
14
UnbalancePh-Ph
15
It is important to notice that the voltage selection from table
regardless the actual external VT connections. The three-phase VT inputs can be
connected to IED as either three phase-to-groundvoltages VA, VB and VC or three phase-
to-phase voltages VAB, VBC and VCA. This information about actual VT connection
is entered as a setting parameter for the pre-processing block, which will then take
automatically care about it.
Comment
CVGAPC function will measure internally calculated negative
sequence voltage phasor. This voltage phasor will be intentionally
rotated for 180° in order to enable easier settings for the directional
feature when used.
CVGAPC function will measure internally calculated zero sequence
voltage phasor multiplied by factor 3. This voltage phasor will be
intentionally rotated for 180° in order to enable easier settings for
the directional feature when used.
CVGAPC function will measure voltage phasor of the phase with
maximum magnitude
CVGAPC function will measure voltage phasor of the phase with
minimum magnitude
CVGAPC function will measure magnitude of unbalance voltage,
which is internally calculated as the algebraic magnitude difference
between the voltage phasor of the phase with maximum magnitude
and voltage phasor of the phase with minimum magnitude. Phase
angle will be set to 0° all the time
CVGAPC function will measure the voltage phasor internally
calculated as the vector difference between the phase A voltage
phasor and phase B voltage phasor (VA-VB)
CVGAPC function will measure the voltage phasor internally
calculated as the vector difference between the phase B voltage
phasor and phase C voltage phasor (VB-VC)
CVGAPC function will measure the voltage phasor internally
calculated as the vector difference between the phase C voltage
phasor and phase A voltage phasor (VC-VA)
CVGAPC function will measure ph-ph voltage phasor with the
maximum magnitude
CVGAPC function will measure ph-ph voltage phasor with the
minimum magnitude
CVGAPC function will measure magnitude of unbalance voltage,
which is internally calculated as the algebraic magnitude difference
between the ph-ph voltage phasor with maximum magnitude and ph-
ph voltage phasor with minimum magnitude. Phase angle will be
set to 0° all the time
1MRK504116-UUS C
143 is always applicable
Application manual