Battery cabinet short-circuit current size factors

What is a short circuit current in a battery?

Battery manufacturers provide a value of short circuit current which needs to be used for validation of proper protection device. Duration of this short circuit current can be of few seconds before a battery failure occurs. The characteristic current and duration changes depending on the battery type.

How much do short circuit currents differ?

It can be concluded that calculated currents differ only by 0.65% depending on the calculation method which justifies neglecting high voltage resistance as well as cable reactance, thus simplifying calculations. This course presented fundamental facts about calculating short circuit currents in the electrical power systems.

How accurate are short circuit currents?

The accuracy of the calculated short circuit currents depends on the modelling accuracy, system configuration and equipment impedances. Other factors include modelling of the electrical machines, generators, grounding point of the system, other system components and different operating conditions.

Are symmetrical short circuit currents sufficient?

The symmetrical short circuit currents calculated using this method can be sufficient since certain degree of asymmetry is included in the rating structure of the breaker depending on the actual operational conditions and overall system X/R ratio. Is located two or more transformations away from the point of the fault.