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Protection and Automation Functions
6.25 Overvoltage Protection with Positive-Sequence Voltage
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
6.25.5
Addr.
Stage 1
_:211:1
_:211:2
_:211:3
_:211:4
_:211:6
Stage 2
_:212:1
_:212:2
_:212:3
_:212:4
_:212:6
Information List
6.25.6
No.
Group indicat.
_:4501:55
_:4501:57
Stage 1
_:211:81
_:211:54
_:211:52
_:211:53
_:211:55
712
Parameter
Stage 1:Mode
Stage 1:Operate & flt.rec.
blocked
Stage 1:Threshold
Stage 1:Dropout ratio
Stage 1:Operate delay
Stage 2:Mode
Stage 2:Operate & flt.rec.
blocked
Stage 2:Threshold
Stage 2:Dropout ratio
Stage 2:Operate delay
Information
Group indicat.:Pickup
Group indicat.:Operate
Stage 1:>Block stage
Stage 1:Inactive
Stage 1:Behavior
Stage 1:Health
Stage 1:Pickup
C
Setting Options
•
off
•
on
•
test
•
no
•
yes
0.300 V to 200.000 V
0.90 to 0.99
0.00 s to 60.00 s
•
off
•
on
•
test
•
no
•
yes
0.300 V to 200.000 V
0.90 to 0.99
0.00 s to 60.00 s
SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
Default Setting
off
no
65.000 V
0.95
3.00 s
off
no
75.000 V
0.95
0.50 s
Data Class
Type
(Type)
ACD
O
ACT
O
SPS
I
SPS
O
ENS
O
ENS
O
ACD
O
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