STAR CONNECTION AND DELTA CONNECTION
STAR connection:-
the starting or finishing ends of three coils are connected together to form
the neutral point. A common wire is taken out from the neutral point which is
known as Neutral. Star is used for high voltage and low current star connection
has three phase four wire system.
Line voltage VL=√3
Vph. phase voltage
Line Current IL= Iph
phase current
STAR connection system :-
1.
Star connection is used where we require Neutral
terminal
2.
star connected system VL=√3Vph
3.
star Connected system IL=I phase
4.
Require less insulation level
5.
Star is used where high voltage and low current
require
What is the use of Star Connection ?
motors or drives connected in star connection runs at lower
speed, Star Connection is suitable in transmission system as the voltage insulation
required is less. In a squirrel cage motor, the starter is used to decrease the input voltage to the motor as
to decrease starting current.
DELTA connection :- delta
connection which is also known as three phase three wire system. it is the suitable system for AC Power Transmission. opposite
ends of three coils are connected together the end of each coil is connected with the
start of another coil, and three wires are taken out from the coil joints. Delta
connection used where high current and low voltage require.
Line Voltage VL= Vph.
Phase Voltage
Line current. IL= √3 Iph.
Phase current
DELTA connection
system :-
1. In
delta connection line voltage equal to phase voltage
2. Phase
current is √3 times less than Line current
3. High
insulation level
4. Delta
connection used where high starting Torque is required
What is the use of Delta Connection ?
Delta connection is used in Distribution system. T.P.D.T switch used for delta connection in running position.
Star/Delta terminal connection shown in the fig below
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