Functions
2.16 Backup Time Overcurrent Protection
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
307
Instantaneous tripping before automatic reclosure
If automatic reclosure is to be carried out, quick fault clearance before reclosure is usually desirable. A release
signal from an external automatic reclosure device can be injected via binary input „>O/C InstTRIP“. The
interconnection of the internal automatic reclose function is performed via an additional CFC logic, which typi-
cally connects the output signal 2889 „AR 1.CycZoneRel“ with the input signal „>O/C InstTRIP“. Any
stage of the overcurrent protection can thus perform an instantaneous trip before reclosure via the parameter
Telep / BI ....
Switching onto a fault
To achieve fast tripping of the circuit breaker in case of an earth fault, the internal line energization detection
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 setting for which stage(s) the instantaneous tripping following energization
applies (refer also to the logic diagrams Figure 2-153, 2-154 and 2-155). This function is independent of the
high-current instantaneous tripping described in Section 2.14.
Pickup logic and tripping logic
The pickup signals of the single phases (or earth) and of the individual stages are thus linked with each other
that both the phase information and the stage that has picked up is indicated (Table 2-12).
Table 2-12 Pickup signals of the single phases
Internal Indication Display Output Indication No.
I>> PU L1
I> PU L1
Ip PU L1
I>>> PU L1
2-153
2-154
2-155
„O/C Pickup L1“ 7162
I>> PU L2
I> PU L2
Ip PU L2
I>>> PU L2
2-153
2-154
2-155
„O/C Pickup L2“ 7163
I>> PU L3
I> PU L3
Ip PU L3
I>>> PU L3
2-153
2-154
2-155
„O/C Pickup L3“ 7164
I>> PU E
I> PU E
Ip PU E
I>>> PU E
2-153
2-154
2-155
„O/C Pickup E“ 7165
I>> PU L1
I>> PU L2
I>> PU L3
I>> PU E
2-153
2-153
2-153
2-153
„O/C PICKUP I>>“ 7191
I> PU L1
I> PU L2
I> PU L3
I> PU E
„O/C PICKUP I>“ 7192
Ip PU L1
Ip PU L2
Ip PU L3
Ip PU E
2-154
2-154
2-154
2-154
„O/C PICKUP Ip“ 7193
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