The increase in the capacity and the improvement in the structure of large generatorsrequire better performance of their protection systems against armature faults. Therefore, itis desirous to further the study on the operation of synchronous machines with internal faultsin stator windings. For this purpose, the armature asymmetry of synchronous generatorsconnected to the power system and operating on load condition is analysed for the first timeby using the multi-loop method. In consideration of the power source a mathematical modelfor asymmetrical generators is established and its solution is proposed. Compared withexperimental results at rated voltage, the new approach is justified.
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