Siemens SIPROTEC 7SJ80

The dropout time curves apply to (Ι/Ιp) ≤ 0.90
For zero sequence current read 3Ι0p instead of Ι
p
and T
3Ι0p
instead of T
p
;
for ground fault read Ι
Ep
instead of Ι
p
and T
ΙEp
instead of T
p
Dropout Setting
ANSI without Disk Emulation
approx. 1.05 · setting value Ι
p
for Ι
p
/Ι
N
≥ 0.3; corresponds to approx.
0.95 · pickup value
Reset of the Integration Timer
ANSI with Disk Emulation
approx. 0.90 · setting value Ι
p
Tolerances
Pickup and Dropout
Thresholds Ι
p
, Ι
Ep
for Ι
Nom
= 1 A
3 % of setting value or 15 mA
for Ι
Nom
= 5 A
3 % of setting value or 75 mA
Trip Time for 2 ≤ Ι/Ι
p
≤ 20
5 % of reference (calculated) value + 2 % current tolerance, or 30
ms
Dropout Time for Ι/Ιp ≤ 0.90
5 % of reference (calculated) value + 2 % current tolerance, or 30
ms
Influencing Variables for Pickup and Dropout
Auxiliary DC voltage in range 0.8 ≤ V
Aux
/V
AuxNom
≤ 1,15 1 %
Technical Data
4.3 Inverse-time Overcurrent Protection
370 SIPROTEC 4, 7SJ80, Manual
E50417-G1140-C343-A8, Edition 12.2017