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The dropout time curves apply to (Ι/Ιp) ≤ 0.90
For zero sequence current read 3Ι0p instead of Ι
for ground fault read Ι
Dropout Setting
ANSI without Disk Emulation
Reset of the Integration Timer
ANSI with Disk Emulation
Tolerances
Pickup and Dropout
Thresholds Ι
, Ι
p
Trip Time for 2 ≤ Ι/Ι
Dropout Time for Ι/Ιp ≤ 0.90
Influencing Variables for Pickup and Dropout
Auxiliary direct voltage in the range of 0.8 ≤ V
SIPROTEC Compact, 7SC80, Manual
E50417-G1140-C486-A8, Edition 07.2017
instead of Ι
and T
Ep
p
approx. 1.05 · setting value Ι
0.95 · pickup value
approx. 0.90 · setting value Ι
for Ι
= 1 A 3 % of setting value or 15 mA
Nom
for Ι
= 5 A 3 % of setting value or 75 mA
Ep
Nom
≤ 20
p
and T
instead of T
p
3Ι0p
instead of T
ΙEp
p
for Ι
p
p
5 % of reference (calculated) value + 2 % current tolerance, or 30
ms
5 % of reference (calculated) value + 2 % current tolerance, or 30
ms
/V
≤ 1.15
PS
PSNom
Technical Data
4.3 Inverse-Time Overcurrent Protection
;
p
/Ι
≥ 0.3; corresponds to approx.
p
N
1 %
517
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