Monitored Data; Operation Principle - ABB RET650 Technical Manual

Section 9
Voltage protection
Name
U1>
t1
t1Min
k1
OperationStep2
U2>
t2
Table 145: ROV2PTOV Non group settings (basic)
Name
GlobalBaseSel
9.3.6
9.3.7
218
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 146: ROV2PTOV Monitored data
Name
ULevel

Operation principle

Two step residual overvoltage protection ROV2PTOV is used to detect earth (zero
sequence) overvoltages. The ground overvoltage 3U
adding the input phase voltages. 3U
measuring directly from a voltage transformer in the neutral of a power transformer,
or from a secondary broken delta connection of a transformer with a star-grounded
primary. ROV2PTOV has two steps with separate time delays. If the ground
overvoltage 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 -
may also be input single phase by either
0
1MRK 504 135-UEN A
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
is normally computed by
0
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