1. D.C. Machines And
Transformers
Scott Connections

2. Group No :- 03
SHETH KUSHAL
MISHRA SUJIT
SUREJA DHARA
BHATIA SHWETA

3. Objectives On The Completion Of This Period You Will Be Able To Know
The Scott Connection
Advantage And Disadvantages
Application Of Scott Connection

4. Scott Connections
Scott Connections:-a Scott- T-transformer Calso Called A Scott Connections Is A Type Of Circuit Used To Derive Three-phase(3- ) Current From A Two Phase Source Or Vice- verse
Can Be Used For 3 Phase To Two Phase Connections Also

5. 3-p To 3-p Coversion
Scott-t-t Connection Consists Of A Center – Tapped 1:1 Ration Main Transformer And An86.6%(0.5 *1.73)ratio Teaser Trensformer
Cont……

6. One End Of The Teaser Transformer Is Joined To The Center Tap Of The Main Transformer
Current In Teaser Transformer Is In Phase With Voltage
Current Leads The Voltage By 30in Half Portion Of Main Transformer And Lays The Voltage By 30 In The Rest Of The Winding

7. 3-p To 2-p Conversion
This Conversion Is Required To Supply Two Phase Furnaces
To Link Two –Phase Circait With 3-phase System And Also To Supply A 3-phase Appartus From A 2- phase Supply Source
The Connection Reqires 2 Transformer Mers Whice May Be Identical But Having Suitable Tapings

8. 3-phase To 2-phase Conversion Connection Diagrams

9. If The Secondary Of Both The Transformes Have
The Some Unmbe Of Turns ,Then Secondary Voltage Will Be Equal In Magnitade Thus Resuiting In A Symmetrical 2-phase ,3-wire Sysem conn…..

10. The No. Of Turns Between A And D Should Be Also (1
The No. Of Turns Between A And D Should Be Also (1.73/2) N, For Making Voltage Turn The Same In Both Primaries
Then For Secondary Having Equal Turns The Secondary Terminal Voltages Will Be Equal In Magnitude Although In Phase Quadrature

11. 3-phase To 2-phase Conversion

12. 2-phase To 3-phase Scott Connection Transformer
Used At Niagara Water Falls Year 1895

13. Advantages of scott connective
The Scott Connection Evenly Distributes A Balueed Load Between The Phase Of The Source
Trans Formers Can Deliver 92.8% Of Their Capa City
There Is A Cost Saving Due To The 2-coil T Connection In –Lieuor The Traditional Three – Coill Primary To 3 Coil Secondary Transformer
With The Help Of Two Transformer 3-phase Supply Can Be Main Tained

14. Disadvantages Of Scott Connection
The Full Rating Of The Transformers Is Not Utilized
The Teaser Trans Former Operates At Only Of Its Rated Voltage

15. Thank You