Short-circuit currents in three-phase a.c systems - Currents during two separate simultaneous line-to-earth short-circuits and partial short-circuit currents flowing through earth Ingestion-build-141043 oxide coating

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Short-circuit currents in three-phase a.c systems - Currents during two separate simultaneous line-to-earth short-circuits and partial short-circuit currents flowing through earth Ingestion-build-141043 oxide coating1 Scope and object This part of IEC 60909 specifies procedures for calculation of the prospective short circuit currents with an unbalanced short circuit in high voltage three phase a. c. systems operating at nominal frequency 50 Hz or 60 Hz, i. e.: a) currents during two separate simultaneous line to earth short circuits in isolated neutral or resonant earthed neutral systems; b) partial short circuit currents flowing through earth in case of single