ABB Relion 670 Series Technical Reference Manual page 573

1MRK505222-UUS C
Section 10
10.1
10.1.1
10.1.2
10.1.2.1
Technical reference manual
Multipurpose protection
About this chapter
This chapter describes Multipurpose protection and includes the General current and
voltage function. The way the functions work, their setting parameters, function
blocks, input and output signals and technical data are included for each function.
General current and voltage protection CVGAPC
Function description
General current and voltage protection
Introduction
The General current and voltage protection (CVGAPC) can be utilized as a negative
sequence current protection detecting unsymmetrical conditions such as open phase or
unsymmetrical faults.
CVGAPC can also be used to improve phase selection for high resistive ground faults,
outside the distance protection reach, for the transmission line. Three functions are
used, which measures the neutral current and each of the three phase voltages. This
will give an independence from load currents and this phase selection will be used in
conjunction with the detection of the ground fault from the directional ground fault
protection function.
Principle of operation
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 297.
Multipurpose protection
IEC 61850 IEC 60617
identification identification
CVGAPC -
Section 10
ANSI/IEEE C37.2
device number
-
567