This simple equation effectively identifies the i2% level for a real load situation against the alternator’s designed i2 capability. The negative sequence overcurrent function provides protection against rotor overheating where rotor heating is proportional to the negative sequence current present in the stator windings: The negative sequence overcurrent function provides protection against possible rotor overheating and damage due to unbalanced faults or other system conditions which can cause unbalanced three phase currents in the generator.
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Generator shall be capable of continuous operation at rated voltage and frequency on an unbalanced load at rated current but containing a 10% negative sequence component
Temperature limits may be exceeded by 5 ºc at this condition.
In case of high speed turbogenerators, the continuous current which can be carried is usually in the range of 10 and 15 per cent of the positive sequence continuous rating The negative sequence heating follows a normal resistance law and so it is proportional to the square of the current. Protection iec symbol (iec60617) ansi (ieee c37.2) operate time negative sequence current 46 < 200 ms* note
