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4.7
Time Overcurrent Protection
Operating Modes
As emergency overcurrent protection or backup overcurrent protection
Emergency Overcurrent Protection
Backup overcurrent protection
Characteristic Curves
Definite dime stages (definite)
Inverse time elements
High-Set Current Elements
Pickup value 50-B1 PICKUP
(phases)
Pickup value 50N-B1 PICKUP
(ground)
Pickup value 67-B1 PICKUP
(directional phases)
Delays
(directional phases)
Delay 50-B1 DELAY
(phases)
Delay 50N-B1 DELAY
(ground)
Dropout ratio
Pickup times
Dropout times
Tolerances
The set times are pure time delays
SIPROTEC 4, 7SD80, Manual
E50417-G1100-C474-A2, Edition 02.2018
Effective when the differential protection system is blocked (e.g. because of a
failure of the device communication)
operates independent of any events
50-B2, 50N-B2, 50-B1, 50N-B1, 50-3, 50N-3, 67-B2, 67N-B2, 67-B1, 67N-B1
(Ι
>, 3Ι
>, Ι
>>, 3Ι
>>, Ι
>>>, 3Ι
Ph
0
Ph
0
Ph
51-B, 51N-B, 67-TOC, 67N-TOC
(
, 3Ι
; Ι
, 3Ι
); a characteristic curve according to
Ι
P
0P
Pdir
0Pdir
Figure 4-3
to
Figure 4-5
can be selected
for Ι
= 1 A
0.10 A to 25.00 A
Nom
or ∞ (ineffective)
for Ι
= 5 A
0.50 A to 125.00 A
Nom
or ∞ (ineffective)
for Ι
= 1 A
0.05 A to 25.00 A
Nom
or ∞ (ineffective)
0.25 A to 125.00 A
for Ι
= 5 A
Nom
or ∞ (ineffective)
0.10 A to 25.00 A
for Ι
= 1 A
Nom
or ∞ (ineffective)
0.50 A to 125.00 A
for Ι
= 5 A
Nom
or ∞ (ineffective)
0.00 s to 30.00 s
67-B1 DELAY
or ∞ (ineffective)
0.00 s to 30.00 s
67N-B1 DELAY
or ∞ (ineffective)
0.00 s to 30.00 s
or ∞ (ineffective)
0.00 s to 30.00 s
or ∞ (ineffective)
approx. 0.93 for Ι/Ι
minimum
typical
maximum
minimum
typical
maximum
Currents
3 % of setting value or 1 % Nennstrom
Times
1 % of setting value or 10 ms
4.7 Time Overcurrent Protection
>>>, Ι
>
, 3Ι
>
, Ι
>>
0
Ph
dir
0
dir
Ph
dir
Increments 0.01 A
Increments0.01 A
Increments 0.01 A
Increments 0.01 s
Increments 0.01 s
Increments 0.01 s
Increments 0.01 s
≥ 0.5
Nom
30 ms
32 ms
35 ms
33 ms
35 ms
38 ms
Technical Data
, 3Ι
>>
)
0
dir
267
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