ABB RET670 Product Manual page 57

ABB
Transformer protection RET670
Customized
Product version: 1.2
Current protection
Table 41. Instantaneous phase overcurrent protection PHPIOC
Function
Operate current
Reset ratio
Operate time
Reset time
Critical impulse time
Operate time
Reset time
Critical impulse time
Dynamic overreach
Table 42. Four step phase overcurrent protection OC4PTOC
Function
Operate current
Reset ratio
Min. operating current
Relay characteristic angle (RCA)
Maximum forward angle
Minimum forward angle
2nd harmonic blocking
Independent time delay
Minimum operate time
Inverse characteristics, see
table 109, table 110 and table
Operate time, start function
Reset time, start function
Critical impulse time
Impulse margin time
Range or value
(1-2500)% of lBase
> 95%
25 ms typically at 0 to 2 x I
25 ms typically at 2 to 0 x I
10 ms typically at 0 to 2 x I
10 ms typically at 0 to 10 x I
35 ms typically at 10 to 0 x I
2 ms typically at 0 to 10 x I
< 5% at t = 100 ms
Setting range
lBase
(1-2500)% of
> 95%
lBase
(1-100)% of
(-70.0– -50.0) degrees
(40.0–70.0) degrees
(75.0–90.0) degrees
(5–100)% of fundamental
(0.000-60.000) s
(0.000-60.000) s
19 curve types
111
25 ms typically at 0 to 2 x I
25 ms typically at 2 to 0 x I
10 ms typically at 0 to 2 x I
15 ms typically
1MRK 504 117-BEN D
Accuracy
± 1.0% of I
± 1.0% of I at I > I
-
-
set
-
set
-
set
-
set
-
set
-
set
-
Accuracy
± 1.0% of I
± 1.0% of I at I > I
-
± 1.0% of I
±1.0% of I at I > I
± 2.0 degrees
± 2.0 degrees
± 2.0 degrees
± 2.0% of I
± 0.5% ±10 ms
± 0.5% ±10 ms
See table 109, table
table 111
-
set
-
set
-
set
-
at I £ I
r r
r
at I ≤ I
r r
r
at I ≤ I
r r
r
r
110 and
57