ABB Relion 670 Series RES670, Техническое руководство

Страница: 340 / 888

Set value for the
parameter
VoltageInput
Comment
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 192 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
entered as a setting parameter for the pre-processing block, which will then take automatic
care about it.
The user can select one of the current quantities shown in table 193 for built-in current
restraint feature:
Table 193: Restraint current selection for CVGAPC function
Set value for the
parameter RestrCurr Comment
1 PosSeq CVGAPC function will measure internally calculated positive sequence
current phasor
2 NegSeq CVGAPC function will measure internally calculated negative sequence
current phasor
3 3ZeroSeq CVGAPC function will measure internally calculated zero sequence current
phasor multiplied by factor 3
4 MaxPh CVGAPC function will measure current phasor of the phase with maximum
magnitude
11.1.6.2 Base quantities for CVGAPC function
The parameter settings for the base quantities, which represent the base (100%) for pickup
levels of all measuring stages, shall be entered as setting parameters for every CVGAPC
function.
Section 11
1MRK 511 365-UUS A
Multipurpose protection
334 Phasor measurement unit RES670 2.1 ANSI
Technical manual