Monitored Data; Operation Principle - ABB REG650 Technical Manual

Section 8
Voltage protection
Name
U1>
t1
t1Min
k1
OperationStep2
U2>
t2
Table 141: ROV2PTOV Non group settings (basic)
Name
GlobalBaseSel
8.3.6
8.3.7
232
Values (Range) Unit
1 - 200 %UB
0.00 - 6000.00 s
0.000 - 60.000 s
0.05 - 1.10 -
Off -
On
1 - 100 %UB
0.000 - 60.000 s
Values (Range) Unit
1 - 6 -

Monitored data

Table 142: ROV2PTOV Monitored data
Name
ULevel

Operation principle

Two step residual overvoltage protection ROV2PTOV is used to detect high single-
phase voltage, such as high residual voltage, also called 3U
can be measured directly from a voltage transformer in the neutral of a power
transformer or from a three-phase voltage transformer, where the secondary
windings are connected in an open delta. Another possibility is to measure the three-
phase voltages and internally in the IED calculate the corresponding residual
voltage and connect this calculated residual voltage to ROV2PTOV. ROV2PTOV
has two steps with separate time delays. If the single-phase (residual) voltage
remains above the set value for a time period corresponding to the chosen time
delay, the corresponding TRIP signal is issued.
The time delay characteristic is setable for step 1 and can be either definite or
inverse time delayed. Step 2 is always definite time delayed.
The voltage related settings are made in percent of the global phase-to-phase base
voltage divided by √3.
Step Default
1 30
0.01 5.00
0.001 5.000
0.01 0.05
- On
1 45
0.001 5.000
Step Default
1 1
Type Values (Range)
REAL -
1MRK 502 034-UEN -
Description
Voltage start value (DT & IDMT) in % of
UBase for step 1
Definite time delay of step 1
Minimum operate time for inverse curves
for step 1
Time multiplier for the inverse time delay
for step 1
Enable execution of step 2
Voltage start value (DT & IDMT) in % of
UBase for step 2
Definite time delay of step 2
Description
Selection of one of the Global Base
Value groups
Unit Description
kV Magnitude of measured
voltage
. The residual voltage
0
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