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Section 7
Current protection
7.2.9
104
BLOCK
Extract second
I
OP
harmonic current
component
Extract
fundamental
current component
|I
|
OP
UseStartValue
IN1>
IN2>
IN3>
IN4>
IEC13000015 V1 EN
Figure 42:
Second harmonic blocking
Technical data
Table 41:
EF4PTOC technical data
Function
Operate current
Reset ratio
Operate current for directional
comparison, Zero sequence
Operate current for directional
comparison, Negative sequence
Min. operating current
Minimum operate time for inverse
characteristics
Timers
Inverse characteristics, see table
461, table
462
and table
463
Table continues on next page
a
a>b
0.07*IBase
b
a
a>b
b
a
a>b
b
X
2ndHarmStab
t=70ms
OR
t
BlkParTransf=On
a
a>b
b
Range or value
lBase
(1-2500)% of
> 95%
(1–100)% of
lBase
(1–100)% of
lBase
(1-10000)% of
lBase
(0.000-60.000) s
(0.000-60.000) s
15 curve types
1MRK 505 288-UEN A
AND
-1
q
AN
OR
2ndH_BLOCK_Int
D
IEC13000015-1-en.vsd
Accuracy
± 1.0% of I
at I < I
r
r
± 1.0% of I at I > I
r
-
± 2.0% of I
r
± 2.0% of I
r
± 1.0% of I
at I < I
r
r
± 1.0% of I at I >I
r
± 0.5% ± 25 ms
± 0.5% ±25 ms
1)
ANSI/IEEE C37.112
IEC 60255–151
±3% or ±40 ms
0.10 ≤ k ≤ 3.00
1.5 x I
≤ I ≤ 20 x I
set
set
Technical manual
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