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