Set value for the
parameter
VoltageInput
Comment
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
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
restraint feature:
Table 191:
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
Section 11
1MRK 511 408-UUS A
Multipurpose protection
338
Phasor measurement unit RES670 2.2 ANSI
Technical manual
Summary of Contents for Relion RES670
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