Siemens SIPROTEC 4 Manual page 200

Functions
2.13 Intermittent Ground Fault Protection
Fault det is blocked for the fault log and the system interface. This method accounts for the fact that the
ΙΙE element may also pick up for a normal short-circuit. In this case the pickup does not launch the alarm
Intermitt.EF .
Intermittent ground faults may cause other overcurrent elements to pick up (e.g. 50-1, 50N-1, 50Ns-1), which
may result in a burst of messages. In order to avoid an overflow of the fault log, its messages are no longer
entered in the fault log after detection of intermittent ground faults (indication
cause a trip command. If an intermittent ground fault has been detected, the following pickup messages of
the time overcurrent protection will still be reported without restraint (see
Table 2-12
FNo.
1800
2642
7551
7552
7553
7554
7559
7560
7561
7562
7565
7566
7567
7564
Table 2-13 shows all messages subject to a restraint mechanism avoiding a message burst during an intermit-
tent ground fault:
Table 2-13
FNo.
1761
1762
1763
1764
1767
1810
1820
1765
1768
1831
1834
1837
2691
2697
2660
2670
2692
2693
2694
200
Unrestricted Messages
Message
50-2 picked up
67-2 picked up
50-1 InRushPU
50N-1 InRushPU
51 InRushPU
51N InRushPU
67-1 InRushPU
67N-1 InRushPU
67-TOC InRushPU
67N-TOCInRushPU
Ia InRush PU
Ib InRush PU
Ic InRush PU
Gnd InRush PU
Buffered Messages
Message
50(N)/51(N) PU
50/51 Ph A PU
50/51 Ph B PU
50/51 Ph C PU
50-3 picked up
50-1 picked up
51 picked up
50N/51NPickedup
50N-3 picked up
50N-2 picked up
50N-1 picked up
51N picked up
67/67N pickedup
67-3 picked up
67-1 picked up
67-TOC pickedup
67 A picked up
67 B picked up
67 C picked up
Intermitt.EF ), unless they
Intermitt.EF ):
Description
50-2 picked up
67-2 picked up
50-1 InRush picked up
50N-1 InRush picked up
51 InRush picked up
51N InRush picked up
67-1 InRush picked up
67N-1 InRush picked up
67-TOC InRush picked up
67N-TOC InRush picked up
Phase A InRush picked up
Phase B InRush picked up
Phase C InRush picked up
ground InRush picked up
Description
50(N)/51(N) picked up
50/51 Phase A picked up
50/51 Phase B picked up
50/51 Phase C picked up
50-3 element picked up
50-1 element picked up
51 element picked up
50N element picked up
50N-3 element picked up
50N-2 element picked up
50N-1 element picked up
51N element picked up
67/67N picked up
67-3 element picked up
67-1 element picked up
67-TOC element picked up
67/67-TOC Phase A picked up
67/67-TOC Phase B picked up
67/67-TOC Phase C picked up
E50417-G1140-C343-A8, Edition 12.2017
SIPROTEC 4, 7SJ80, Manual