Table 44. Instantaneous residual overcurrent protection EFPIOC
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 lBase -
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. = 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 to 0 x I
set
Min. = 25 ms
Max. = 35 ms
-
Critical impulse time 2 ms typically at 0 to 10 x I
set
-
Dynamic overreach
< 5% at t = 100 ms
-
Table 45. Four step residual overcurrent protection EF4PTOC technical data
Function
Range or value Accuracy
Operate current (1-2500)% of
lBase
± 1.0% of I
r
at I < I
r
± 1.0% of I at I > I
r
Reset ratio > 95% at (1-2500)% of
lBase
-
Operate current for directional
comparison
(1–100)% of
lBase
For RCA ± 60 degrees:
± 2.5% of I
r
at I ≤ I
r
± 2.5% of I < I
r
Independent time delay for step 1,
2, 3, and 4
(0.000-60.000) s ± 0.2% or ± 35 ms whichever is
greater at 0 to 2 x I
set
Inverse characteristics, see table
117, table 118 and table 119
18 curve types See table 117, table 118 and table
119
Second harmonic restrain
operation
(5–100)% of fundamental ± 2.0% of I
r
Relay characteristic angle (-180 to 180) degrees ± 2.0 degrees
Minimum polarizing voltage (1–100)% of
UBase
± 0.5% of U
r
Minimum polarizing current (2-100)% of
IBase
± 1.0% of I
r
Real part of source Z used for
current polarization
(0.50-1000.00) W/phase
-
Imaginary part of source Z used
for current polarization
(0.50–3000.00) W/phase
-
Operate time, start function at 0 to
2 x I
set
Min 18 ms
Max 28 ms
-
Reset time, start function at 2 to 0
x I
set
Min 18 ms
Max 28 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
64 ABB
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