Siemens 6MD85, Manual

Page: 625 / 1256

Parameter:
Current/time value pairs
(of the dropout characteristic curve)
With these settings, you define the characteristic curve. Set a current/time value pair for each characteristic-
curve point. The setting depends on the characteristic curve you want to realize.
Set the current value as a multiple of the threshold value. Siemens recommends that you set the
Threshold
parameter to
1.00
in order to obtain a simple relation. You can change the threshold value setting afterwards
if you want to shift the characteristic curve.
Set the time value in seconds. The characteristic curve is shifted via the
Time dial
parameter.
i
i
NOTE
The value pairs must be entered in continuous order.
Parameter:
1-pole operate allowed
•
Default setting
(_: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 (gener-
ated in the trip logic of the Circuit-breaker function group) is always 3-pole
because the device does not support phase-selective tripping.
Parameter:
Threshold (absolute)
•
Default setting
(_:113) Threshold (absolute)
=
0.000 A
With the
Threshold (absolute)
parameter, you define and change the absolute pickup threshold of the
stage without changing all points of the characteristic curve.
The parameter is only used for special applications. With the default setting, this functionality is disabled. You
can find more information in
Pickup and Dropout Behaviors with the User-Defined Characteristic Curve ,
Page 623 .
Settings
Addr. Parameter C Setting Options Default Setting
General
_:1 User curve #:Mode
•
off
•
on
•
test
off
_:2 User curve #:Operate &
flt.rec. blocked
•
no
•
yes
no
_:11 User curve #:1-pole
operate allowed
•
no
•
yes
no
_:26 User curve #:Dynamic
settings
•
no
•
yes
no
_:27 User curve #:Blk. w.
inrush curr. detect.
•
no
•
yes
no
_:8 User curve #:Method of
measurement
•
fundamental comp.
•
RMS value
fundamental
comp.
_:120 User curve #:I0 elimina-
tion
•
no
•
yes
no
7.4.6.3
Protection and Automation Functions
7.4 Overcurrent Protection, Phases
SIPROTEC 5, High-Voltage Bay Controller, Manual 625
C53000-G5040-C015-9, Edition 11.2017