Backup Time Overcurrent Protection - Siemens SIPROTEC 7SD610 Manual

Technical Data

4.8 Backup Time Overcurrent Protection

4.8 Backup Time Overcurrent Protection
Operating Modes
As emergency overcurrent protection or back-up overcurrent protection
Backup time overcurrent protection
Backup overcurrent protection
Characteristics
Definite time stages (definite)
Inverse time stages (IDMT)
High-set Current Stages
Pickup value Iph>>
(phases)
Pickup value 3I0>> PICKUP
(earth)
Delay T Iph>>
(Phases)
Delay T 3I0>>
(earth)
Dropout ratio
Pick-up times
Dropout times
Tolerances
The set times are pure delay times
344
Effective when the differential protection system is blocked (e.g. because of a failure
of the device communication)
operates independent of any events
I >, 3I >, I >>, 3I >>, I
Ph 0 Ph 0 Ph
I , 3I ; I , 3I ; one of the characteristics according to
P 0P Pger 0Pger
4-2 to Figure 4-4 can be selected
for I = 1 A 0.10 A to 25.00 A
N
or ∞ (ineffective)
for I = 5 A 0.50 A to 125.00 A
N
or ∞ (ineffective)
for I = 1 A 0.05 A to 25.00 A
N
or ∞ (ineffective)
for I = 5 A 0.25 A to 125.00 A
N
or ∞ (ineffective)
0.00 s to 30.00 s
or ∞ (ineffective)
0.00 s to 30.00 s
or ∞ (ineffective)
Approx. 0.93 for I/I
ca. 33 ms
Approx. 30 ms
Currents 3 % of setting value or 1 % nominal current
Times 1 % of setting value or 10 ms
>>>, 3I >>>, I > , 3I >
0 Ph ger 0 ger
≥ 0,5
N
C53000-G1176-C145-6, Release date 02.2011
Increment 0.01 A
Increment 0.01 A
Increments 0.01 s
Increments 0.01 s
SIPROTEC, 7SD610, Manual