Current protection
Table 42. 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 to 0 x I
set
Min. = 15ms
Max. = 25ms
-
Critical impulse time 10 ms typically at 0 to 2 x I
set
-
Operate time at 0 to 10 x I
set
Min. = 5ms
Max. = 15 ms
-
Reset time at 10 to 0 x I
set
Min. = 25ms
Max. = 40 ms
-
Critical impulse time 2 ms typically at 0 to 10 x I
set
-
Dynamic overreach
< 5% at t = 100 ms
-
Table 43. Four step phase overcurrent protection OC4PTOC
Function
Setting range 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
lBase
-
Min. operating current (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
2nd harmonic blocking (5–100)% of fundamental
± 2.0% of I
r
Independent time delay at 0 to 2 x
I
set
(0.000-60.000) s
± 0.2 % or ± 35 ms whichever is
greater
Minimum operate time (0.000-60.000) s ± 2.0 % or ± 40 ms whichever is
greater
Inverse characteristics, see
table 117, table 118 and table 119
16 curve types See table 117, table 118 and table 119
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 to 0 x I
set
Min. = 15 ms
Max. = 30 ms
Critical impulse time 10 ms typically at 0 to 2 x I
set
-
Impulse margin time 15 ms typically -
Transformer protection RET670 2.0
1MRK 504 141-BEN C
Product version: 2.0
ABB 63
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