Trip Time Characteristics according to IEC
Acc. to IEC 60255-3 or BS 142, Sectiont 3.5.2 (see also Figure 4-1 and Figure 4-2)
The tripping times for Ι/Ι
51Ns
≥ 20 are identical with those for Ι/Ι
EEp
= 20
Pickup threshold
approx. 1.10 · Ι
EEp
Dropout Time Curves with Disk Emulation acc. to. IEC
Acc. to IEC 60255-3 or BS 142, Section 3.5.2 (see also
Figure 4-1 and Figure 4-2)
The dropout time curves apply to (Ι/Ι
EEp
) ≤ 0.90
Pickup Threshold IEC
IEC without disk emulation
approx. 1.05 · setting value Ι
EEp
for Ι
EEp
/Ι
N
≥ 0,3; this corresponds to
approx. 0,95 · pickup value
IEC with disk emulation
approx. 0.90 · setting value Ι
EEp
Technical Data
4.17 Ground Fault Detection (Sensitive/Insensitive)
SIPROTEC 4, 7SJ62/64, Manual 487
C53000-G1140-C207-8, Edition 08.2016
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