ABB RELION 670 Series Technical Manual page 577

1MRK 502 066-UUS B
Function
Trip value, undervoltage
Critical impulse time, undervoltage
Impulse margin time, undervoltage
Trip value, overvoltage
Definite time delay, overcurrent, at 0 to 2
x I
set
Definite time delay, undervoltage, at 1.2 x
V to 0.8 x V
set
Definite time delay, overvoltage, at 0.8 x
V to 1.2 x V
set
8.16 Voltage-restrained time overcurrent protection VRPVOC
(51V)
8.16.1 Identification
Function description
Voltage-restrained time overcurrent
protection
8.16.2 Functionality
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.
Technical manual
set
set
IEC 61850
identification
VRPVOC
Range or value
(2-150)% of VBase
10 ms typically at 2 to 0 x V
set
15 ms typically
(2-200)% of VBase
(0.000-60.000) s
(0.000-60.000) s
(0.000-60.000) s
IEC 60617
identification
I>/U<
Current protection
Accuracy
±0.5% of V at V ≤ V
n
±0.5% of V at V > V
n
-
-
±0.5% of V at V ≤ V
n
±0.5% of V at V > V
n
±0.2% or ±35 ms whichever
is greater
Less than 35 ms (±0.2% or
±35 ms, whichever is
greater) at 1.2 x V
set
V
set
Less than 35 ms (±0.2% or
±35 ms, whichever is
greater) at 0.8 x V
set
V
set
GUID-613620B1-4092-4FB6-901D-6810CDD5C615 v4
GUID-7835D582-3FF4-4587-81CE-3B40D543E287 v4
ANSI/IEEE C37.2
device number
51V
GUID-935E1CE8-601F-40E2-8D22-2FF68420FADF v6
Section 8
n
n
to 0.8 x
to 1.2 x
571