3phase to 5 phase

Telechargé par Ahcene Boulayoune
3 PHASE TO 5
PHASE
TRANSFORMER
WHY 5 PHASE OVER 3 PHASE
Multiphase machine has a greater fault tolerance compared to
its 3 phase counterparts if one phase of the 3 phase machine
becomes open circuited so single phasing occurs . It may
continue to run, but will require external means for starting
and must be massively derated. If one phase of multiphase
machine becomes open circuited it will self start and will run
with only minimal derating
Another reason for multiphase variable speed drive is the
possibility of reducing the required rating of the power
electronics components for a given output power of the motor,
when compared to a 3 phase motor.
Utilization of multiphase motor drives also enables
improvement in the noise characteristics when compared to three
phase motor drives
The stator excitation in a multiphase machine produces
a field with a lower space-harmonic content, so that the
efficiency is higher than in a three-phase machine.
Reduction in stator joules loss achieved by increasing the
number of phases beyond 3
No of phase - 5 6 9 12 15 18
Stator cu loss - 5.6 6.6 7.9 8.3 8.5 8.8
reduction (%)
wrt 3 phase
FACTS ABOUT TRANSFORMER
It works on the principle of mutual
induction
It is a shell type of transformer
Transformation ratio is unity
Phase difference between each phase is
72 degrees
CONSTRUCTION & WORKING
1 / 16 100%
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