Power system short circuit levels must be determined in order to specify the required interrupting capacity at various points on the system and also to evaluate the earthing provisions at substations. Specifically fault current calculations are required:
„ To establish short circuit ratings of interrupting devices, such as circuit breakers and fuses.
„ To determine the short-time or withstand thermal rating of system components, such as cables, transformers, reactors, etc.
„ To calculate settings of short circuit protective devices, such as direct-acting trips, fuses and relays.
„ To evaluate voltage levels in the system under the fault condition.
„ To determine the amount of current flow through the earthing
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