If a power is reversed in three phase supply, what will happen to the motor if they are connected.
Reversing a phase (interchanging two phases) will cause the motor to rotate in just opposite direction as previously it was rotating.
Strictly speaking, you cannot reverse a single phase in a three-phased system, you could only cancel it completely by disconnecting it.
If you exchange two phases, Mahamad is right - the motor will simply change direction.
Such a system results in positive, negative and zero sequence components. Though on supply side this may rarely occur, but when an induction motor is rewinded or connected to star delta starter -similar situation may result. Though the motor is started, but one of the phase current is execeeively high even at no load condition as well as during starting.
This problem is mentioned in my book Electrical Machines, 2e, Cengage Publication.
Thanks Mr.Rakesh.. i got it what i expected... thanks to all...
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