Question

The diagram given below shows the connection of a four-wire
delta bank for obtaining a 3-phase 4-wire distribution system. The
secondary voltages between the terminals are as indicated.
A
a
T.
115 V
llele
230 V 230 V
llll
00000
cof 20000
115 V
I
B
00000
C
230 V
P
Zo
00
S
What is the voltage between the
terminals b and d in the above
system which the primary side
is energized from an appropriate
symmetrical 3-phase system?
REFERENCE BUS​

Answer 1

this picture explain all the diagram per confusion solve.