Undervoltage Protection - ABB REG650 Technical Manual

Section 8
Current protection
8.10.7.5
8.10.8
250

Undervoltage protection

The undervoltage step simply compares the magnitude of the measured voltage
quantity with the set pickup level. The undervoltage step picks up if the magnitude of
the measured voltage quantity is smaller than the set level.
The pickup signal starts a definite time delay. If the value of the pickup signal is one
for longer than the set time delay, the undervoltage step sets its trip signal to one.
This undervoltage with additional ACT logic can be used to provide funcionality for
overcurrent protection with undervoltage seal-in.
Technical data
Table 136: VR2PVOC(51V) technical data
Function
Pickup overcurrent
Definite time delay
Inverse characteristics,
see table 501, table 502
and table 503
Operate time pickup
overcurrent
Reset time pickup
overcurrent
Pickup undervoltage
Operate time pickup
undervoltage
Reset time pickup
undervoltage
High voltage limit, voltage
dependent operation
Reset ratio, overcurrent
Reset ratio, undervoltage
Overcurrent:
Critical impulse time
Impulse margin time
Range or value
(2 - 5000)% of IBase
(0.00 - 6000.00) s
17 curves type
30 ms typically at 0 to 2 x I
set
20 ms typically at 0 to 10 x I
set
40 ms typically at 2 to 0 x I
set
(2.0 - 100.0)% of VBase
30 ms typically 2 to 0 x V
set
40 ms typically at 0 to 2 x V
set
(30 - 100)% of VBase
> 95%
< 105%
10 ms typically at 0 to 2 x I
set
15 ms typically
1MRK 502 043-UUS B
Accuracy
± 1.0% of I at I<I
r r
± 1.0% of I at I>I
r
± 0.5% ± 25 ms
ANSI/IEEE C37.112
IEC 60255–151
±3% or ±40 ms
0.10 ≤ k ≤ 3.00
1.5 x I ≤ I ≤ 20 x I
set set
-
-
± 0.5% of V
r
-
-
± 1.0% of V
r
-
-
-
Technical Manual