a
b
a>b
BLOCK
AND
I
OP
Extract second
harmonic current
component
Extract
fundamental
current component
X
2ndHarmStab
a
b
a>b
a
b
a>b
0.07*IBase
IEC13000014-2-en.vsd
2ndH_BLOCK_Int
IEC13000014 V2 EN-US
Figure 80: Second harmonic blocking
8.2.8 Technical data
M12342-1 v20
Table 75: OC4PTOC technical data
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
660,
table 662 and table 664
16 curve types See table 660,
table 662 and
table 664
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 -
Section 8 1MRK 505 394-UEN A
Current protection
178 Line differential protection RED650 2.2 IEC
Technical manual
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