Siemens 6MD85, Manual

Page: 797 / 1256

Parameter: Dropout ratio
•
Recommended setting value
(_:211:4) Dropout ratio
=
0.95
The default value of
0.95
is appropriate for most applications. To achieve high measurement precision, the
Dropout ratio
can be reduced, to 0.98, for example.
General Notes
If the overvoltage is high, the first stage can trip with a short time delay. If overvoltages are lower, the second
stage can either only signal the threshold value violation (see Operation as monitoring function) or trip with a
longer delay to allow the voltage controller to regulate the voltage back into the nominal range.
Operation as Supervision Function
If you want the tripping stage to have a reporting effect only, generation of the operate indication and fault
logging can be disabled via the
Operate & flt.rec. blocked
parameter.
Settings
Addr. Parameter C Setting Options Default Setting
Stage 1
_:211:1 Stage 1:Mode
•
off
•
on
•
test
off
_:211:2 Stage 1:Operate & flt.rec.
blocked
•
no
•
yes
no
_:211:3 Stage 1:Threshold 0.300 V to 200.000 V 65.000 V
_:211:4 Stage 1:Dropout ratio 0.90 to 0.99 0.95
_:211:6 Stage 1:Operate delay 0.00 s to 60.00 s 3.00 s
Stage 2
_:212:1 Stage 2:Mode
•
off
•
on
•
test
off
_:212:2 Stage 2:Operate & flt.rec.
blocked
•
no
•
yes
no
_:212:3 Stage 2:Threshold 0.300 V to 200.000 V 75.000 V
_:212:4 Stage 2:Dropout ratio 0.90 to 0.99 0.95
_:212:6 Stage 2:Operate delay 0.00 s to 60.00 s 0.50 s
Information List
No. Information Data Class
(Type) Type
Group indicat.
_:4501:55 Group indicat.:Pickup ACD O
_:4501:57 Group indicat.:Operate ACT O
Stage 1
_:211:81 Stage 1:>Block stage SPS I
_:211:54 Stage 1:Inactive SPS O
_:211:52 Stage 1:Behavior ENS O
_:211:53 Stage 1:Health ENS O
_:211:55 Stage 1:Pickup ACD O
7.14.5
7.14.6
Protection and Automation Functions
7.14 Overvoltage Protection with Positive-Sequence Voltage
SIPROTEC 5, High-Voltage Bay Controller, Manual 797
C53000-G5040-C015-9, Edition 11.2017