![ABB REC650 ANSI Скачать руководство пользователя страница 104](http://html.mh-extra.com/html/abb/rec650-ansi/rec650-ansi_technical-manual_2772104.webp)
6.4
Four step residual overcurrent protection, zero,
negative sequence direction EF4PTOC (51N/67N)
6.4.1
Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Four step residual overcurrent
protection, zero or negative sequence
direction
EF4PTOC
2
IEC11000263 V1 EN
51N/67N
6.4.2
Functionality
The four step residual overcurrent protection, zero or negative sequence direction
(EF4PTOC, 51N/67N) has independent inverse time delay settings for step 1 and 4. Step
2 and 3 are always definite time delayed.
All IEC and ANSI inverse time characteristics are available.
EF4PTOC (51N/67N) can be set directional or non-directional independently for each of
the steps.
The directional part of the function can be set to operate on following combinations:
•
Directional current (I3PDir) versus Polarizing voltage (V3PPol)
•
Directional current (I3PDir) versus Polarizing current (I3PPol)
•
Directional current (I3PDir) versus Dual polarizing (VPol+ZPol x IPol) where ZPol
= RPol + jXPol
IDir, VPol and IPol can be independently selected to be either zero sequence or negative
sequence.
Other setting combinations are possible, but not recommended.
Second harmonic blocking level can be set for the function and can be used to block each
step individually.
EF4PTOC (51N/67N) can be used as main protection for phase-to-ground faults.
Section 6
1MRK 511 287-UUS A
Current protection
98
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 ...