Siemens Siprotec 7VK61 Manual page 72

Functions
2.3 Overcurrent protection (optional)
Switching onto a fault
To achieve fast tripping of the circuit breaker in the event of an earth fault, the manual CLOSE detection function
can be used. The time overcurrent protection can then trip three-pole without delay or with a reduced delay. It
can be determined via parameter settings for which stage(s) the instantaneous tripping following energisation
applies (see also the logic diagrams Figure 2-12, 2-13 and 2-15).
Pickup logic and tripping logic
The pickup signals of the individual phases (or the ground) and of the stages are linked in such a way that both
the phase information and the stage which has picked up are output (Table 2-3).
Table 2-3
Internal Annunciation
I>> PU L1
I> PU L1
Ip PU L1
I>>> PU L1
I>> PU L2
I> PU L2
Ip PU L2
I>>> PU L2
I>> PU L3
I> PU L3
Ip PU L3
I>>> PU L3
I>> PU E
I> PU E
Ip PU E
I>>> PU E
I>> PU L1
I>> PU L2
I>> PU L3
I>> PU E
I> PU L1
I> PU L2
I> PU L3
I> PU E
Ip PU L1
Ip PU L2
Ip PU L3
Ip PU E
I>>> PU L1
I>>> PU L2
I>>> PU L3
I>>> PU E
(All pickups)
For the tripping signals (table 2-4) the stage which caused the tripping is also output. If the device has the option
to trip single-pole and if this option has been activated, the pole which has been tripped is also indicated in case
of single-pole tripping (refer also to Section 2.8.1 „Tripping Logic of the Entire Device").
72
Pickup signals of the individual phases
Figure
2-12
2-13
2-15
2-12
2-13
2-15
2-12
2-13
2-15
2-12
2-13
2-15
2-12
2-12
2-12
2-12
2-13
2-13
2-13
2-13
2-15
2-15
2-15
2-15
Output Annunciation
„O/C Pickup L1"
„O/C Pickup L2"
„O/C Pickup L3"
„O/C Pickup E"
„O/C PICKUP I>>"
„O/C PICKUP I>"
„O/C PICKUP Ip"
„I-STUB PICKUP"
„O/C PICKUP"
C53000-G1176-C159-3, Release date 05.2009
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SIPROTEC, 7VK61, Manual