What happens if a three phase induction motor is suddenly
single-phased while running? Which type of winding
connection will be affected?
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Answer Posted / derek
For a Delta connected motor two of the phases (coil sets)
will see normal curent and the other phase will see 200%
current. The supply current in the two remaining phases
will be 173% of normal current. In this situation one coil
is across AC power and the other two coils in series with
each other are in parallel connection with the first.
For a Star connected motor tow coils will carry %173 of
normal current while the other leg has no power. The two
active supply lines will have %173 of normal current.
If the motor is running at %70 load the current may not be
high enough to trip the overload protection and the motor
will overheat.
Slow blow overload protection should be sized to trip in
these conditions.
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