ABB REG670 - Page 583

The user can select to measure one of the voltage quantities shown in table 333:
Table 333: Voltage selection for CVGAPC function
Set value for the
parameter
VoltageInput
Comment
1 Phase1 CVGAPC function will measure the phase L1 voltage phasor
2 Phase2 CVGAPC function will measure the phase L2 voltage phasor
3 Phase3 CVGAPC function will measure the phase L3 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
Phase1-Phase2 CVGAPC function will measure the voltage phasor internally calculated
as the vector difference between the phase L1 voltage phasor and phase
L2 voltage phasor (U
L1
-U
L2
)
11
Phase2-Phase3 CVGAPC function will measure the voltage phasor internally calculated
as the vector difference between the phase L2 voltage phasor and phase
L3 voltage phasor (U
L2
-U
L3
)
12
Phase3-Phase1 CVGAPC function will measure the voltage phasor internally calculated
as the vector difference between the phase L3 voltage phasor and phase
L1 voltage phasor ( U
L3
-U
L1
)
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 333 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 U
L1
, U
L2
& U
L3
or three
phase-to-phase voltages U
L1L2
, U
L2L3
& U
L3L1
). This information about actual VT
1MRK502052-UEN B Section 11
Multipurpose protection
577
Technical manual