Siemens 7SJ85 - Settings

Parameter: Dropout delay
•
Default setting (_:661:101) Dropout delay = 0.00 s
This parameter is not visible in the basic stage.
Siemens recommends using the default setting 0 since the dropout of a protection stage must be done as fast
as possible.
You can use the Dropout delay parameter ≠ 0 to obtain a uniform dropout behavior if you use it together
with an electromechanical relay. This is required for time grading. The dropout time of the electromechanical
relay must be known for this purpose. Subtract the dropout time of your own device (see Technical Data) and
set the result.
Parameter: Dropout ratio
•
Default setting (_:661:4) Dropout ratio = 0.95
This parameter is not visible in the basic stage.
The recommended set value of 0.95 is appropriate for most applications.
To achieve high-precision measurements, the setting value of the parameter Dropout ratio can be
reduced, for example, to 0.98. If you expect highly fluctuating measurands at the response threshold, you
can increase the setting value of the parameter Dropout ratio. This avoids chattering of the tripping stage.
Parameter: 1-pole operate allowed
•
Default setting (_:661:11) 1-pole operate allowed = no
The parameter must be set for the specific application.
Parameter Value
Description
no
The stage always operates 3-pole.
yes
The stage operates phase-selectively. However, tripping by the device (generated in
the trip logic of the Circuit-breaker function group) is always 3-pole because the
device does not support phase-selective tripping.
Settings
Addr.
Parameter C Setting Options Default Setting
General
_:661:1 Definite-T 1:Mode
•
off
•
on
•
test
off
_:661:2 Definite-T 1:Operate &
flt.rec. blocked
•
no
•
yes
no
_:661:11 Definite-T 1:1-pole
operate allowed
•
no
•
yes
no
_:661:26 Definite-T 1:Dynamic
settings
•
no
•
yes
no
_:661:27 Definite-T 1:Blk. w.
inrush curr. detect.
•
no
•
yes
no
_:661:8 Definite-T 1:Method of
measurement
•
fundamental comp.
•
RMS value
fundamental
comp.
_:661:120 Definite-T 1:I0 elimina-
tion
•
no
•
yes
no
6.3.4.3
Protection and Automation Functions
6.3 Overcurrent Protection, Phases
SIPROTEC 5, Overcurrent Protection, Manual 335
C53000-G5040-C017-8, Edition 07.2017