ABB Relion 670 series - Page 704

11.1.7 Operation principle
11.1.7.1 Measured quantities within CVGAPC
M13751-3 v3
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
Comment
1 PhaseA CVGAPC function will measure the phase A current phasor
2 PhaseB CVGAPC function will measure the phase B current phasor
3 PhaseC CVGAPC function will measure the phase C current phasor
4 PosSeq CVGAPC function will measure internally calculated positive sequence current phasor
5 NegSeq CVGAPC function will measure internally calculated negative sequence current phasor
6 3ZeroSeq CVGAPC function will measure internally calculated zero sequence current phasor
multiplied by factor 3
7 MaxPh CVGAPC function will measure current phasor of the phase with maximum magnitude
8 MinPh CVGAPC function will measure current phasor of the phase with minimum magnitude
9 UnbalancePh 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
10 PhaseA-PhaseB 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
A
-I
B
)
11 PhaseB-PhaseC 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
B
-I
C
)
12 PhaseC-PhaseA 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
C
-I
A
)
13 MaxPh-Ph CVGAPC function will measure ph-ph current phasor with the maximum magnitude
14 MinPh-Ph CVGAPC function will measure ph-ph current phasor with the minimum magnitude
15 UnbalancePh-Ph 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
The user can select to measure one of the voltage quantities shown in table 410:
Section 11 1MRK 502 066-UUS B
Multipurpose protection
698
Technical manual