Functions
2.12 Intermittent Ground Fault Protection
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A5, Release date 11.2012
209
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 Unrestricted Indications
FNo. Indication Explanation
1800 „50-2 picked up“ 67-2 Element picked up
7551 „50-1 InRushPU“ 50-1 inrush Element picked up
7552 „50N-1 InRushPU“ 50N-1 inrush Element picked up
7553 „51 InRushPU“ 51 inrush Element picked up
7554 „51N InRushPU“ 51N inrush Element picked up
7560 „67N-1 InRushPU“ 67N-1 inrush Element picked up
7562 „67N-TOCInRushPU“ 67N-TOC inrush Element picked up
7565 „Ia InRush PU“ Phase A inrush picked up
7566 „Ib InRush PU“ Phase B inrush picked up
7567 „Ic InRush PU“ Phase C inrush picked up
7564 „Gnd InRush PU“ Ground inrush picked up
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