Hi friends in this video we are going
to see three-phase supply connections
there are two connections we'll get star
and Delta so lets discuss star
connection first
so in star connection the circuit will
be like this
we are having a 3 windings connected
such a way that one end of each winding
is connected together to form a neutral
point so lets take this is R phase Y
and B so this is say R 1 R 2 this will
be Y 1 Y 2 and this is B 1 B 2 so one
end of each winding that is R 2 Y 2 B 2
 connected together to form a star or a
neutral point N and remaining ends are
left for connection to load one more
structure of star will be like this
so one end that is R 2 Y 2 B 2
connected together to form a neutral
point and an open ends are for
connection to load so this is star
connection
lets study Delta Connection
in Delta Connection 3 windings are
connected such a way that they will form
a loop so just say how the Delta will
look like
this is R line B and this is say Y
here it will be R 1 R 2 this will be Y 1
Y 2 and this will be B 1 B 2 so Delta is
formed such a way that second end of
first winding is connected to first end
of second winding and second end of
second winding is connected to first end
of a third winding and second end of
third is connected to first end of first
so it bit confusing but just remember
that 3 windings are connected such a
way that they form a closed loop then
that connection is called as a delta
open ends obviously for load connection
one more structure for Delta is like
this
so it is R Y B this will be R 1 R 2
Y 1 Y 2 and B 1 B 2 it is also similar
to this but just drawn in different
orientation see here 3 windings connected
such a way that they are forming a loop
so loop could be anything
not necessarily it should be a triangle
it could be of any shape but make sure
that it should be a closed path and then
these 3 ends are taken for load
connection this star and Delta we have
already learned in DC circuit so
whatever concepts of star and Delta we
have learned over there is applicable
over here as far as the structure is
concerned remaining part is slightly
different which we cannot compare with a
DC circuit because there we have seen
only resistances are counted in star and
Delta but here supplies and load are
connected in star and Delta thank you
