ABB Relion 670 series, Product Manual

Page: 76 / 146

M12342-1 v21
Table 49. Directional phase overcurrent protection, four steps OC4PTOC
Function Range or value Accuracy
Operate current, step 1-4 (5-2500)% of lBase
± 1.0% of I
r
at I ≤ I
r
± 1.0% of I at I > I
r
Reset ratio > 95% at (50–2500)% of
lBase -
Minimum operate current, step 1-4 (1-10000)% of
lBase
± 1.0% of I
r
at I ≤ I
r
± 1.0% of I at I > I
r
Relay characteristic angle (RCA) (40.0–65.0) degrees
± 2.0 degrees
Relay operating angle (ROA) (40.0–89.0) degrees ± 2.0 degrees
Second harmonic blocking (5–100)% of fundamental
± 2.0% of I
r
Independent time delay at 0 to 2 x I
set
, step
1-4
(0.000-60.000) s ± 0.2% or ± 35 ms whichever is greater
Minimum operate time for inverse curves ,
step 1-4 (0.000-60.000) s ±0.2% or ±35 ms whichever is greater
Inverse time characteristics, see table 157 ,
table 158 and table 159
16 curve types See table 157 , table 158 and table 159
Operate time, start non-directional at 0 to
2 x I
set
Min. = 15 ms -
Max. = 30 ms
Reset time, start non-directional at 2 x I
set
to 0
Min. = 15 ms -
Max. = 30 ms
Operate time, start non-directional at 0 to
10 x I
set
Min. = 5 ms
Max. = 20 ms -
Reset time, start non-directional at 10 x I
set
to 0
Min. = 20 ms
Max. = 35 ms -
Critical impulse time 10 ms typically at 0 to 2 x I
set
-
Impulse margin time 15 ms typically -
Operate frequency, directional overcurrent 38-83 Hz -
Operate frequency, non-directional
overcurrent 10-90 Hz -
1MRK 504 155-BEN F
Transformer protection RET670 2.1 IEC
76 ABB