2.14 Backup Time Overcurrent Protection
273
7SD5 Manual
C53000-G1176-C169-1
The I>>> stage can, however, also be used as a standard additional and independent
overcurrent stage, since it works independent of the other stages. In this case, the
enable input „>I-STUB ENABLE“ must be activated permanently (via a binary input
or CFC).
Figure 2-119 Logic diagram of the I>>> stage
Instantaneous Trip-
ping before Auto-
matic Reclosure
Automatic reclosure is applied in order to instantaneously remove the fault before au-
tomatic reclosure. A release signal from an external automatic reclosure device can
be injected via binary input „>O/C InstTRIP“. The internal automatic reclosure - if
available - is also effected by this command. Any stage of the overcurrent protection
can thus perform an instantaneous trip before reclosure via the parameter Telep/BI
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