ABB RELION 670 Series Technical Manual page 704

Section 11
Multipurpose protection
11.1.7 Operation principle
11.1.7.1 Measured quantities within CVGAPC
General current and voltage protection (CVGAPC) function is always connected to three-phase
current and three-phase voltage input in the configuration tool, but it will always measure only one
current and one voltage quantity selected by the end user in the setting tool.
The user can select to measure one of the current quantities shown in table 409.
Table 409: Current selection for CVGAPC function
Set value for the
parameter
CurrentInput
1 PhaseA
2 PhaseB
3 PhaseC
4 PosSeq
5 NegSeq
6 3ZeroSeq
7 MaxPh
8 MinPh
9 UnbalancePh
10 PhaseA-PhaseB
11 PhaseB-PhaseC
12 PhaseC-PhaseA
13 MaxPh-Ph
14 MinPh-Ph
15 UnbalancePh-Ph
The user can select to measure one of the voltage quantities shown in table 410:
698
Comment
CVGAPC function will measure the phase A current phasor
CVGAPC function will measure the phase B current phasor
CVGAPC function will measure the phase C current phasor
CVGAPC function will measure internally calculated positive sequence current phasor
CVGAPC function will measure internally calculated negative sequence current phasor
CVGAPC function will measure internally calculated zero sequence current phasor
multiplied by factor 3
CVGAPC function will measure current phasor of the phase with maximum magnitude
CVGAPC function will measure current phasor of the phase with minimum magnitude
CVGAPC function will measure magnitude of unbalance current, which is internally
calculated as the algebraic magnitude difference between the current phasor of the
phase with maximum magnitude and current phasor of the phase with minimum
magnitude. Phase angle will be set to 0° all the time
CVGAPC function will measure the current phasor internally calculated as the vector
difference between the phase A current phasor and phase B current phasor (I
CVGAPC function will measure the current phasor internally calculated as the vector
difference between the phase B current phasor and phase C current phasor (I
CVGAPC function will measure the current phasor internally calculated as the vector
difference between the phase C current phasor and phase A current phasor ( I
CVGAPC function will measure ph-ph current phasor with the maximum magnitude
CVGAPC function will measure ph-ph current phasor with the minimum magnitude
CVGAPC function will measure magnitude of unbalance current, which is internally
calculated as the algebraic magnitude difference between the ph-ph current phasor
with maximum magnitude and ph-ph current phasor with minimum magnitude.
Phase angle will be set to 0° all the time
1MRK 502 066-UUS B
M13751-3 v3
-I )
A B
-I )
B C
-I )
C A
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