Basic Electrical and Electronics Engineering: Unit II: Electrical Machines
Three Phase Transformer
Usually large scale generation of electrical power used 3 phase voltages of 13.3 kV or some what higher.
THREE
PHASE TRANSFORMER
Usually
large scale generation of electrical power used 3 phase voltages of 13.3 kV or
some what higher. Transmission is generally accomplished at higher voltages of
110, 132, 275, 400 and 750 kV for which purpose 3ϕ transformers are necessary
to step up the generated voltage to that of the transmission line.
Like
single phase transformers, the three phase transformers are also of core type
or shell type. The basic principle of a 3ϕ transformer is illustrated in the
fig., in which primary windings have been shown interconnected in star and put
across 3-phase supply. The three cores are 120° apart and their empty keys are
shown in contact with each other the centre leg formed by these three, carries
the flux produced by the three phase currents IR, IY, and
IB. As at any instant IR+IY+IB = 0,
hence the sum of three fluxes is also zero.
Therefore,
it will make no difference if the common leg is removed. In that case any two
legs will act as the return for the third just as in a 3-phase system any two
conductors act as the return for the current in the third conductor.
Basic Electrical and Electronics Engineering: Unit II: Electrical Machines : Tag: : - Three Phase Transformer
Basic Electrical and Electronics Engineering: Unit II: Electrical Machines
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