Monitored Data - ABB REG650 Technical Manual

1MRK 502 043-UUS B
8.10.6
8.10.7
8.10.7.1
8.10.7.2
8.10.7.3
Technical Manual

Monitored data

Table 135: VR2PVOC(51V) Monitored data
Name Type
IMAX REAL
VUmin REAL
Operation principle
Measured quantities
The voltage-restrained time overcurrent protection (VR2PVOC, 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.
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.
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 the decrease in the magnitude of the measured voltage quantity. Two
different types of dependencies are available:
• Voltage restraint overcurrent (when setting parameter VDepMode = Slope)
Values (Range) Unit
- A
- kV
Section 8
Current protection
Description
Maximum phase current
magnitude
Minimum ph-to-ph voltage
magnitude
247