Operation Principle - ABB REB650 Technical Manual

1MRK 505 277-UUS C
7.6.7
7.6.8
Technical Manual

Operation principle

Negative sequence based overcurrent function (DNSPTOC, 46) has two settable
current levels, setting parameters PickupCurr_OC1 and PickupCurr_OC2. Both
features have definite time characteristics with settings tDef_OC1 and tDef_OC2
respectively. It is possible to change the direction of these steps to forward, reverse or
non-directional by setting parameters DirMode_OC1 and DirMode_OC2. At too low
polarizing voltage the overcurrent feature can be either blocked or non-directional.
This is controlled by settings ActLowVolt1_VM and ActLowVolt2_VM.
Technical data
Table 64: DNSPTOC (46) Technical data
Function
Operate current
Reset ratio
Low voltage level for memory
Relay characteristic angle
Relay operate angle
Timers
Operate time, non-directional
Reset time, non-directional
Operate time, directional
Reset time, directional
Critical impulse time
Impulse margin time
Dynamic overreach
Range or value
IBase
(2.0 - 5000.0) % of
> 95 %
VBase
(0.0 - 5.0) % of
(-180 - 180) degrees
(1 - 90) degrees
(0.00 - 6000.00) s
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
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
10 ms typically at 0 to 2 x I
set
2 ms typically at 0 to 10 x I
set
15 ms typically
< 10% at t = 300 ms
Section 7
Current protection
Accuracy
± 1.0% of I at I <I
r n
± 1.0% of I at I > I
n
-
< ± 0.5% of V
n
± 2.0 degrees
± 2.0 degrees
± 0.5% ± 25 ms
-
-
-
-
-
-
-
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