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1MRK 506 369-UEN B
Section 12
12.1
12.1.1
12.1.2
Line distance protection REL670 2.2 IEC
Application manual
Multipurpose protection
General current and voltage protection CVGAPC
Identification
Function description
General current and voltage protection
Application
A breakdown of the insulation between phase conductors or a phase conductor and
earth results in a short circuit or an earth 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, earth 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-earth, 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:
Multipurpose protection
IEC 61850
IEC 60617
identification
identification
CVGAPC
2(I>/U<)
Section 12
IP14552-1 v2
M14886-2 v3
ANSI/IEEE C37.2
device number
-
IP15008-1 v1
M13084-3 v5
565
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