Section 11
Multipurpose protection
11.1
General current and voltage protection CVGAPC
11.1.1
Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
General current and voltage protection
CVGAPC
2(I>/U<)
-
11.1.2
Functionality
The protection module is recommended as a general backup protection with many
possible application areas due to its flexible measuring and setting facilities.
The built-in overcurrent protection feature has two settable current levels. Both of
them can be used either with definite time or inverse time characteristic. The
overcurrent protection steps can be made directional with selectable voltage
polarizing quantity. Additionally they can be voltage and/or current controlled/
restrained. 2nd harmonic restraining facility is available as well. At too low polarizing
voltage the overcurrent feature can be either blocked, made non directional or ordered
to use voltage memory in accordance with a parameter setting.
Additionally two overvoltage and two undervoltage steps, either with definite time or
inverse time characteristic, are available within each function.
The general function suits applications with underimpedance and voltage controlled
overcurrent solutions. The general function can also be utilized for generator
transformer protection applications where positive, negative or zero sequence
components of current and voltage quantities are typically required.
Additionally, generator applications such as loss of field, inadvertent energizing,
stator or rotor overload, circuit breaker head flash-over and open phase detection are
just a few of possible protection arrangements with these functions.
11.1.2.1
Inadvertent generator energization
When the generator is taken out of service, and non-rotating, there is a risk that the
generator circuit breaker flashes over or is closed by mistake.
1MRK502052-UEN B
Section 11
Multipurpose protection
565
Technical manual
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