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Fault Logging
A fault event and thus fault logging is initiated when the non-stabilized IiE Element picks up for the first time. A
message „IIE Fault det" is produced. The message „IIE Fault det" is issued and entered in the
fault log (and reported to the system interface) so often until the number of pickups „IIE Fault det" has
reached the value set for parameter Nos.det.. When this happens, the message „Intermitt.EF" is issued
and „IIE Fault det" is blocked for the fault log and the system interface. This method accounts for the fact
that the IiE 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 „Intermitt.EF"), unless they
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 2-11):
Table 2-11
FNo.
1800
7551
7552
7553
7554
7560
7562
7565
7566
7567
7564
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A5, Release date 11.2012
Unrestricted Indications
Indication
„50-2 picked up"
„50-1 InRushPU"
„50N-1 InRushPU"
„51 InRushPU"
„51N InRushPU"
„67N-1 InRushPU"
„67N-TOCInRushPU"
„Ia InRush PU"
„Ib InRush PU"
„Ic InRush PU"
„Gnd InRush PU"
2.12 Intermittent Ground Fault Protection
Explanation
67-2 Element picked up
50-1 inrush Element picked up
50N-1 inrush Element picked up
51 inrush Element picked up
51N inrush Element picked up
67N-1 inrush Element picked up
67N-TOC inrush Element picked up
Phase A inrush picked up
Phase B inrush picked up
Phase C inrush picked up
Ground inrush picked up
Functions
209
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