![ABB REC650 ANSI Скачать руководство пользователя страница 120](http://html.mh-extra.com/html/abb/rec650-ansi/rec650-ansi_technical-manual_2772120.webp)
6.4.8
Second harmonic blocking element
A harmonic restrain of the Four step residual overcurrent protection function EF4PTOC
51N_67N can be chosen. If the ratio of the 2nd harmonic component in relation to the
fundamental frequency component in the residual current exceeds the pre-set level
defined by parameter setting
2ndHarmStab
. Any of the four residual overcurrent stages
can be selectively blocked by parameter setting
HarmRestrainx
. When 2nd harmonic
restraint feature is active the EF4PTOC 51N_67N function output signal 2NDHARMD
will be set to logical value one.
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 42:
Second harmonic blocking
Section 6
1MRK 511 287-UUS A
Current protection
114
Technical manual
Содержание REC650 ANSI
Страница 1: ...Relion 650 series Bay control REC650 ANSI Technical manual ...
Страница 2: ......
Страница 42: ...36 ...
Страница 60: ...54 ...
Страница 66: ...60 ...
Страница 424: ...418 ...
Страница 566: ...560 ...
Страница 636: ...630 ...
Страница 699: ...693 ...