8/16/2019 Winding Connections

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1

 Y / Y Y / DD / YD / D

Transformer Connection

8/16/2019 Winding Connections

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2

y0

-30oy1

+30oy11

Transformer Connection

8/16/2019 Winding Connections

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3

How to Connect Windings

8/16/2019 Winding Connections

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4

 A

BC

Delta Wye

a2

a1

b1

b2

c2

  c1

a

a2

a1c

1

c2

b1

b2

c b A

BC

B2

B1

C1C2

 A2

 A1

Dy 1

Step 1

Step 2

8/16/2019 Winding Connections

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5

D / Y

 A

B

C

a

b

c

a1   a2

b1   b2

c1   c2

 A2   A1

B2   B1

C2   C1

 A

BC

B2

B1

C1C2

 A2

 A1

Step 3

Step 4

8/16/2019 Winding Connections

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6

 A

BC

Delta Wye

a2

a1   b

1b

2

c2

c1

a

a2

a1c

1

c2

b1

b2

c b A

BC

 A1

 A2

B2B1

C1

C2

Dy 11

Step 1

Step 2

8/16/2019 Winding Connections

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7

D / Y

 A

B

C

a

b

c

a1   a2

b1   b2

c1   c2

 A2   A1

B2   B1

C2   C1

 A

BC

 A1

 A2

B2B1

C1

C2

Step 3

Step 4

8/16/2019 Winding Connections

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8

a

bc

Delta Wye

 A

 A2

 A1C1

C21

B1

B2

C B

 Yd 11

Step 1

 A

 A2

 A1

C1

C2   B1

B2

C B

a2

a1

b1

b2

c2

c1

8/16/2019 Winding Connections

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9

D / Y

a

b

c

 A

B

C

 A1   A2

B1   B2

C1   C2

a2   a1

b2   b1

c2   c1

bc

b2

b1

c1c2

a2

a1

Step 3

Step 4

a

8/16/2019 Winding Connections

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10

Transformer Connections

Standard Vector Group

Group  Phase Displacement Connection

 Cloc !o" Degrees

1 0 0 Yy0,Dd0

2 6 180o Yy6,Dd6

3 1 30o

a! Dy1, yd14 11 30o ead Dy11,Yd11