Siemens SIPROTEC 7SD80 User Manual

Technical Data
4.7 Time Overcurrent Protection
SIPROTEC, 7SD80, Manual
E50417-G1140-C474-A1, Release date 09.2011
302
4.7 Time Overcurrent Protection
Operating Modes
Characteristic Curves
High-Set Current Elements
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
Definite dime stages (definite) I
Ph
>, 3I
0
>, I
Ph
>>, 3I
0
>>, I
Ph
>>>, 3I
0
>>>, I
Ph
>
dir
, 3I
0
>
dir
, I
Ph
>>
dir
, 3I
0
>>
dir
Inverse time elements I
P
, 3I
0P
; I
Pdir
, 3I
0Pdir
; a characteristic curve according to
Figure 4-3 to 4-5 can be selected.
Pickup value 50-B1 PICKUP
(phases)
for I
Nom
= 1 A 0.10 A to 25.00 A
or ∞ (ineffective)
Increments 0.01 A
for I
Nom
= 5 A 0.50 A to 125.00 A
or ∞ (ineffective)
Pickup value 50N-B1 PICKUP
(ground)
for I
Nom
= 1 A 0.05 A to 25.00 A
or ∞ (ineffective)
Increments 0.01 A
for I
Nom
= 5 A 0.25 A to 125.00 A
or ∞ (ineffective)
Pickup value
(directional phases)
for I
Nom
= 1 A 0.10 A to 25.00 A
or ∞ (ineffective)
Increments 0.01 A
for I
Nom
= 5 A 0.50 A to 125.00 A
or ∞ (ineffective)
Delays
(directional elements)
0.00 s to 30.00 s
or ∞ (ineffective)
Increments 0.01 s
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 I/I
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 % nominal current
Times 1 % of setting value or 10 ms
The set times are pure time delays

Siemens SIPROTEC 7SD80 Specifications

General

Brand	Siemens
Model	SIPROTEC 7SD80
Category	Protection Device
Language	English