Current protection
Table 50. Instantaneous phase overcurrent protection PHPIOC
Function Range or value Accuracy
Operate current (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 IBase -
Operate time at 0 to 2 x I
set
Min. = 15 ms
Max. = 25 ms
-
Reset time at 2 x I
set
to 0 Min. = 15 ms
Max. = 25 ms
-
Critical impulse time 10 ms typically at 0 to 2 x I
set
-
Operate time at 0 to 10 x I
set
Min. = 5 ms
Max. = 15 ms
-
Reset time at 10 x I
set
to 0 Min. = 25 ms
Max. = 40 ms
-
Critical impulse time 2 ms typically at 0 to 10 x I
set
-
Dynamic overreach
< 5% at t = 100 ms
-
Table 51. Directional phase overcurrent protection, four steps OC4PTOC
Function
Setting range 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 180,
table 181 and table 182
16 curve types See table 180, table 181 and table 182
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 -
1MRK 506 372-BEN -
Line distance protection REL670 2.2
Product version: 2.2
74 ABB
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