Siemens 6MD86 - Settings

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 6MD85 (generated in
the trip logic of the function group Circuit-breaker) is always 3-pole because the
device does not support phase-selective tripping.
Tripping by the 6MD86 is 1-pole using the 1-/3-pole circuit-breaker. The decision as to
which poles of the circuit-breaker to open is not made until central trip command
control becomes involved.
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
_:661:3 Definite-T 1:Threshold 1 A @ 100 Irated 0.030 A to 35.000 A 1.500 A
5 A @ 100 Irated 0.15 A to 175.00 A 7.50 A
1 A @ 50 Irated 0.030 A to 35.000 A 1.500 A
5 A @ 50 Irated 0.15 A to 175.00 A 7.50 A
1 A @ 1.6 Irated 0.001 A to 1.600 A 1.500 A
5 A @ 1.6 Irated 0.005 A to 8.000 A 7.500 A
_:661:4 Definite-T 1:Dropout
ratio
0.90 to 0.99 0.95
_:661:102 Definite-T 1:Pickup delay 0.00 s to 60.00 s 0.00 s
_:661:101 Definite-T 1:Dropout
delay
0.00 s to 60.00 s 0.00 s
_:661:6 Definite-T 1:Operate
delay
0.00 s to 60.00 s 0.30 s
7.4.4.3
Protection and Automation Functions
7.4 Overcurrent Protection, Phases
SIPROTEC 5, High-Voltage Bay Controller, Manual 609
C53000-G5040-C015-9, Edition 11.2017