System protection and safety coordination definitions

Siemens Air Circuit BreakersThe objective of system protection is to detect faults and to selectively isolate faulted parts of the system. It must also permit short clearance times to limit the fault power and the effect of arcing faults.High power density, high individual power outputs, and the relatively short distances in industrial and building power systems mean that low voltage and medium voltage systems are closely linked.Activities in the LV system (short circuits, starting currents) also have an effect on the MV system. If the situation is reversed, the control state of the MV system affects the selectivity

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