Table 298: Voltage selection for CVGAPC function
Set value for the
parameter
VoltageInput
Comment
1 PhaseA CVGAPC function will measure the phase A voltage phasor
2 PhaseB CVGAPC function will measure the phase B voltage phasor
3 PhaseC CVGAPC function will measure the phase C voltage phasor
4 PosSeq CVGAPC function will measure internally calculated positive sequence
voltage phasor
5 -NegSeq 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.
6 -3ZeroSeq 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.
7 MaxPh CVGAPC function will measure voltage phasor of the phase with maximum
magnitude
8 MinPh CVGAPC function will measure voltage phasor of the phase with minimum
magnitude
9 UnbalancePh 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
10 PhaseA-PhaseB CVGAPC function will measure the voltage phasor internally calculated as
the vector difference between the phase A voltage phasor and phase B
voltage phasor (V
A
-V
B
)
11 PhaseB-PhaseC CVGAPC function will measure the voltage phasor internally calculated as
the vector difference between the phase B voltage phasor and phase C
voltage phasor (V
B
-V
C
)
12 PhaseC-PhaseA CVGAPC function will measure the voltage phasor internally calculated as
the vector difference between the phase C voltage phasor and phase A
voltage phasor ( V
C
-V
A
)
13 MaxPh-Ph CVGAPC function will measure ph-ph voltage phasor with the maximum
magnitude
14 MinPh-Ph CVGAPC function will measure ph-ph voltage phasor with the minimum
magnitude
15 UnbalancePh-Ph 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
It is important to notice that the voltage selection from table 298 is always applicable
regardless the actual external VT connections. The three-phase VT inputs can be
connected to IED as either three phase-to-ground voltages V
A
, V
B
& V
C
or three phase-
to-phase voltages V
AB
, V
BC
& V
CA
). This information about actual VT connection is
1MRK505222-UUS C Section 10
Multipurpose protection
569
Technical reference manual
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