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Table 151:
VRPVOC (51V) Non group settings (basic)
Name
Values (Range)
Unit
Step
Default
Description
GlobalBaseSel
1 - 6
-
1
1
Selection of one of the Global Base Value
groups
8.10.6
Monitored data
Table 152:
VRPVOC (51V) Monitored data
Name
Type
Values (Range)
Unit
Description
IMAX
REAL
-
A
Maximum phase current
magnitude
UUMIN
REAL
-
kV
Minimum ph-to-ph voltage
magnitude
8.10.7
Operation principle
8.10.7.1
Measured quantities
The voltage-restrained time overcurrent protection VRPVOC (51V) function is always
connected to three-phase current and three-phase voltage input in the configuration tool
(ACT), but it will always measure the maximum of the three-phase currents and the
minimum of the three phase-to-phase voltages.
8.10.7.2
Base quantities
GlobalBaseSel
: Selects the global base value group used by the function to define (
IBase
),
(
VBase
) and (
SBase
).
IBase
shall be entered as rated phase current of the protected object in primary amperes.
VBase
shall be entered as rated phase-to-phase voltage of the protected object in primary
kV.
8.10.7.3
Overcurrent protection
The overcurrent step simply compares the magnitude of the measured current quantity
with the set pickup level. The overcurrent step picks up if the magnitude of the measured
current quantity is bigger than the set level.
Voltage restraint/control feature
The overcurrent protection operation is made dependent of a measured voltage quantity.
This means that the pickup level of the overcurrent step is not constant but decreases with
Section 8
1MRK 502 048-UUS A
Current protection
276
Technical manual
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