Protection and Control Guide by ex Merlin Gerin (now Schneider Electric)

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Equipment behaviour during short-circuits

There are 2 types of system equipment the type that intervenes and the type that does not

intervene at the time of a fault

Passive equipment

This category comprises all equipment which due to its function must have the capacity to

transport both normal current and short-circuit current without damage

This equipment includes cables lines busbars disconnecting switches switches transformers

series reactances and capacitors instrument transformers

For this equipment the capacity to withstand a short-circuit without damage is defined in terms

of

Electrodynamic withstand (expressed in peak kA) characterizing mechanical resistance to

electrodynamic stress Thermal withstand (expressed in rms kA for 1 to 5 seconds)

characterizing maximum admitted overheating

Protection and Control Guide | EEP httpwwwembeddedtrainingcoin

For this equipment the capacity to withstand a short-circuit without damage is defined in terms of This category comprises the

equipment designed to clear short circuit currents circuit breakers and fuses

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