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What happens if one leg in a 3 phase synchronous motor fails does it reverse its rotation?
Wiki User
∙ 11y ago
No it does not reverse rotation. If the proper motor protection is used on the motor, the motor should trip off line. Loosing a leg will drive the other two legs of the motor into a higher than normal state. This higher current will be sensed by the overload protection and the motor contactor will drop out. This opening of the motor contactor will drop the supply to the motor and the motor will stop.
To reverse a three phase motor, reverse any two feed wires to the motor. This is usually done at the motor's junction box to preserve the wire colour coding of the wires through out the system.
AnswerDo you really mean a 'phase' or do you mean a 'line'? This is an example of where the use of correct terminology is important. 'Losing a phase' means losing one of the machine's three field windings, whereas 'losing a line' means losing one of the three supply conductors. Two completely different situations for a delta-connected machine.
For example, for delta-connected field windings, the three-phase supply is maintained and the machine assumes an 'open delta' condition, whereas losing a line places two windings in series and in parallel with the third, across a single-phase supply.
Wiki User
∙ 11y ago
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