ABB Relion 670 Series Applications Manual page 245

1MRK 511 401-UUS F
Section 11
11.1 General current and voltage protection CVGAPC
11.1.1 Identification
Function description
General current and voltage
protection
11.1.2 Application
A breakdown of the insulation between phase conductors or a phase conductor and ground
results in a short circuit or a ground fault respectively. Such faults can result in large fault currents
and may cause severe damage to the power system primary equipment. Depending on the
magnitude and type of the fault different overcurrent protections, based on measurement of
phase, ground or sequence current components can be used to detect these faults. Additionally it
is sometimes required that these overcurrent protections shall be directional and/or voltage
controlled/restrained.
The over/under voltage protection is applied on power system elements, such as generators,
transformers, motors and power lines in order to detect abnormal voltage conditions. Depending
on the type of voltage deviation and type of power system abnormal condition different over/
under voltage protections based on measurement of phase-to-ground, phase-to-phase, residual-
or sequence- voltage components can be used to detect and operate for such incident.
The IED can be provided with multiple General current and voltage protection (CVGAPC)
protection modules. The 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.
Each CVGAPC function module has got four independent protection elements built into it.
1. Two overcurrent steps with the following built-in features:
Bay control REC670
Application manual
Multipurpose protection
IEC 61850
identification
CVGAPC
© Copyright 2017 ABB. All rights reserved
IEC 60617 ANSI/IEEE C37.2
identification device number
2(I>/U<) -
Section 11
Multipurpose protection
IP14552-1 v2
M14886-2 v3
IP15008-1 v1
M13084-3 v5
239