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не может это быть Tie-Protective Device? Enhanced handling of tie-protective device configurations. Allow different equipment type
configurations across a tie-pd bus. The worst-case incident energy is reported for the tie-pd Sequence-of-Operation provides a system wide solution for an accurate and
realistic operating time and state of protective devices, such as relay, fuse, circuit breaker, trip devices, contactor, etc. The operation time is calculated for each protective device based on its settings, time current characteristic, and interlocks for a specified fault location and type.
http://etap.com/docs/default-source/technical-papers/etap14-1_readme.pdf?sfvrsn=6 The next step requires the selection of the arc fault clearing time (FCT). The default is set
to the automatic determination of the FCT from the Star protective device time current
characteristics (TCC) of the protective devices (PD). In most cases, the most conservative solution is reached by selecting a TCC only for the main feeder PD since they take a longer time to operate. If you do not select a TCC for the bus, ETAP will use the userdefined FCT from the bus Arc Flash page.
http://etap.com/docs/default-source/qa-documentation/etap-getting-started.pdf?sfvrsn=8
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