Siemens SIPROTEC 7SK80 User Manual

Technical Data
4.3 Inverse-Time Overcurrent Protection 51(N)
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A4, Release date 08.2010
351
Trip Time Curves acc. to ANSI
Acc. to ANSI/IEEE (see also Figures 4-3 to 4-6)
The tripping times for I/I
p
≥ 20 are identical with those for I/I
p
= 20.
For zero sequence current read 3I0p instead of I
p
and T
3I0p
instead of T
p
;
for ground fault read I
Ep
instead of I
p
and T
IEp
instead of T
p
Pickup Threshold approx. 1.10 · I
p

Siemens SIPROTEC 7SK80 Specifications

General

Brand	Siemens
Model	SIPROTEC 7SK80
Category	Protection Device
Language	English