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
IEC13000015-1-en.vsd
2NDHARMD
UseStartValue
IN1>
IN2>
IN3>
IN4>
a
b
a>b
|I
OP
|
t
t=70ms
OR
AN
D
BlkParTransf=On
q
-1
OR
2ndH_BLOCK_Int
IEC13000015 V1 EN
Figure 75:
Second harmonic blocking
8.4.9
Technical data
Table 90:
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%
-
Operate current for directional
comparison, Zero sequence
(1–100)% of
lBase
±
2.0% of I
r
Operate current for directional
comparison, Negative sequence
(1–100)% of
lBase
±
2.0% of I
r
Min. operating current
(1-10000)% of
lBase
± 1.0% of I
r
at I < I
r
± 1.0% of I at I >I
r
Minimum operate time for inverse
characteristics
(0.000-60.000) s
± 0.5% ± 25 ms
Timers
(0.000-60.000) s
±
0.5%
±
25 ms
Inverse characteristics, see table
15 curve types
1)
ANSI/IEEE C37.112
IEC 60255–151
±
3% or
±
40 ms
0.10 ≤ k ≤ 3.00
1.5 x I
set
≤ I ≤ 20 x I
set
Table continues on next page
1MRK 504 135-UEN A
Section 8
Current protection
171
Technical manual
Summary of Contents for ret650
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