STAR-DELTA STATER

@Bishal Sharma @EIE

`Star-Delta

A balance three(3-Φ) phase supply can be connected either in delta or star connectionΦ

Delta connection Star connection

NeutralVp

VL

IN CASE OF DELTA

Delta connection

VL=VpandIp=IL/√3

Where..

VL=Line voltageVp=Phase voltageIL= Line currentIp= Phase voltage

IN CASE OF STAR

Star connection

NeutralVp

VL

IL=IpVp=VL/√3

Where..

VL=Line voltageVp=Phase voltageIL=Line currentIp=Phase voltage

DELTA to star

Delta connection Star connection

NeutralVp

VL

Delta to star…..

STAR to delta

Delta connection Star connection

NeutralVp

VL

Star to Delta….

Delta connection

Star connection

Both Star vs Delta

Star Starter

Working

Delta connection

Delta working….

Working…

Working…

A1

A2

A3

A4

A5

A6

U1

V1W1

U2 V2 W2

Fuse

Thermal overload Relay

Delta contactor

Starcontactor

Star-Delta Connection