The document discusses star and delta connections for three-phase power systems. In a delta connection, the line voltage equals the phase voltage and the line current is lower than the phase current. In a star connection, the phase voltage is lower than the line voltage and the line current equals the phase current. The document also mentions converting between delta and star connections, and using a star-delta starter to gradually apply voltage in a motor.

1. STAR-DELTA STATER
@Bishal
Sharma
@EIE

2. `Star-Delta
A balance three(3-Φ) phase supply can be
connected either in delta or star
connectionΦ
Delta connection Star connection
Neutral
Vp
VL

3. IN CASE OF DELTA
Delta connection
VL=Vp
and
Ip=IL/√3
Where..
VL=Line voltage
Vp=Phase voltage
IL= Line current
Ip= Phase voltage

4. IN CASE OF STAR
Star connection
Neutral
Vp
VL
IL=Ip
Vp=VL/√3
Where..
VL=Line voltage
Vp=Phase voltage
IL=Line current
Ip=Phase voltage

5. DELTA to star
Delta connection Star connection
Neutral
Vp
VL

6. Delta to star…..

7. STAR to delta
Delta connection Star connection
Neutral
Vp
VL

8. Star to Delta….

9. Delta connection

10. Star connection

11. Both Star vs Delta

12. Star Starter

13. Working

14. Delta connection

15. Delta working….

16. Working…

17. Working…

18. A1
A2
A3
A4
A5
A6
U1
V1
W1
U2 V2 W2
Fuse
Thermal overload
Relay
Delta
contactor
Star
contactor
Star-Delta Connection