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Functions
2.12 Intermittent Ground Fault Protection
The message „IIE Fault det" will be entered in the fault log and reported to the system interface only until
the message „Intermitt.EF" is issued. This prevents a burst of messages. If the message is allocated to
an LED or a relay, this limitation does not apply. This is accomplished by doubling the message (message
numbers 6924, 6926).
Interaction with Breaker Failure Protection
A pickup that is present when the time delay TRIP-Timer has expired is interpreted by the breaker failure pro-
tection as a criterion for a tripping failure. Since permanent pickup is not ensured after a tripping command by
the intermittent ground fault protection, cooperation with the breaker failure protection is not sensible. There-
fore, this function is not activated by the intermittent ground fault protection.
Logic Diagram
The following figure shows the logic diagram for the intermittent ground fault protection function.
Figure 2-75
Logic diagram of the intermittent ground fault protection – principle
208
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A5, Release date 11.2012
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