Pickup Logic And Tripping Logic; Setting Notes - Siemens SIPROTEC 7SC80 Series Manual

2.2.5

Pickup Logic and Tripping Logic

The pickup annunciations of the individual phases (or ground) and the individual elements are combined with
each other in such a way that the phase information and the Element that has picked up are issued:
Table 2-3 Pickup Indications of Overcurrent Protection
Internal indication
PU 50-3 A
PU 50-2 A
PU 50-1 A
PU 50-3 B
PU 50-2 B
PU 50-1 B
PU 50-3 C
PU 50-2 C
PU 50-1 C
PU 50N-3
PU 50N-2
PU 50N-1
PU 50-3 A
PU 50-3 B
PU 50-3 C
PU 50N-3
PU 50-2 A
PU 50-2 B
PU 50-2 C
PU 50N-2
PU 50-1 A
PU 50-1 B
PU 50-1 C
PU 50N-1
(All pickups)
In the trip signals, the Element which initiated the tripping is also indicated.
2.2.6

Setting Notes

General
When selecting overcurrent protection in DIGSI, a dialog box appears with several tabs for setting the individual
parameters. The number of tabs can vary, depending on the functional scope specified during configuration of
the protective functions in addresses 112 Charac. Phase and 113 Charac. Ground. If FCT 50/51 was
set to Definite Time, or Charac. Ground to Definite Time, then the settings for the definite-time el-
ements are available.
Parameter 250 50/51 2-ph prot can also be set to activate two-phase overcurrent protection.
Under address 1201 FCT 50/51, overcurrent protection for phases and under address 1301 FCT 50N/51N,
the ground overcurrent protection can be switched ON or OFF.
Pickup values and time delays for ground protection can be set separately from those for phase. Because of
this, an independent grading for ground faults is often possible with shorter times and more sensitive settings.
SIPROTEC, 7SC80, Manual
E50417-G1140-C486-A1, Release date 12.2011
Figure
2-3 „50/51 Ph A PU"
2-5
2-3 „50/51 Ph B PU"
2-5
2-3 „50/51 Ph C PU"
2-5
2-4 „50N/51NPickedup"
2-7
„50-3 picked up"
2-3
2-3 „50-2 picked up"
2-3
2-4 „50N-2 picked up"
2-5
2-5 „50-1 picked up"
2-5
2-7 „50N-1 picked up"
„50(N)/51(N) PU"
2.2 Overcurrent Protection 50, 51, 50N, 51N
Output indication
Functions
FNo.
1762
1763
1764
1765
1767
1800
1831
1810
1834
1761
63