Function Range or value Accuracy
Trip value, undervoltage (2-150)% of VBase ±0.5% of V
n
at V ≤ V
n
±0.5% of V at V > V
n
Critical impulse time, undervoltage 10 ms typically at 2 to 0 x V
set
-
Impulse margin time, undervoltage 15 ms typically -
Trip value, overvoltage (2-200)% of VBase ±0.5% of V
n
at V ≤ V
n
±0.5% of V at V > V
n
Definite time delay, overcurrent, at 0 to 2
x I
set
(0.000-60.000) s ±0.2% or ±35 ms whichever
is greater
Definite time delay, undervoltage, at 1.2 x
V
set
to 0.8 x V
set
(0.000-60.000) s Less than 35 ms (±0.2% or
±35 ms, whichever is
greater) at 1.2 x V
set
to 0.8 x
V
set
Definite time delay, overvoltage, at 0.8 x
V
set
to 1.2 x V
set
(0.000-60.000) s Less than 35 ms (±0.2% or
±35 ms, whichever is
greater) at 0.8 x V
set
to 1.2 x
V
set
8.16 Voltage-restrained time overcurrent protection VRPVOC
(51V)
GUID-613620B1-4092-4FB6-901D-6810CDD5C615 v4
8.16.1 Identification
GUID-7835D582-3FF4-4587-81CE-3B40D543E287 v4
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Voltage-restrained time overcurrent
protection
VRPVOC I>/U< 51V
8.16.2 Functionality
GUID-935E1CE8-601F-40E2-8D22-2FF68420FADF v6
Voltage-restrained time overcurrent protection (VRPVOC, 51V) function can be used as generator
backup protection against short-circuits.
The overcurrent protection feature has a settable current level that can be used either with
definite time or inverse time characteristic. Additionally, it can be voltage controlled/restrained.
One undervoltage step with definite time characteristic is also available within the function in
order to provide functionality for overcurrent protection with undervoltage seal-in.
1MRK 502 066-UUS B Section 8
Current protection
571
Technical manual
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