3 Phase Transformers

3 Phase Transformers - Check Values - Unchecked As Yet

Find formulas for these calculations in Reference Formulas Appendix page 11 and 12. 

Find practice problems HERE.

 

 

Delta Delta

Delta Wye

Wye Wye

Wye Delta

Primary

E Line        El  

277

480

831

480

 

E Phase      Eph

277

480

480

277

 

I Line         Il

138.56

50

14.14

21.22

 

I Phase       Iph

80

28.86

14.14

21.22

 

P Line        Pl

58,715

39,923

18,000

27,000

 

P Phase      Pph

19,567

13,307

6,000

9,000

 

 

 

 

 

 

 

 

 

 

 

 

Secondary

E Line        El

208

415

360

240

 

E Phase      Eph

208

240

208

240

 

I Line         Il

162.76

55.43

18.86

49

 

I Phase       Iph

93.97

55.43

18.86

49

 

P Line        Pl

51,788

38,340

12,000

18,000

 

P Phase      Pph

18,751

12,780

4,000

6,000

 

 

 

 

 

 

 

efficiency   eff

.96

.98

.94

.94

 

ratio

1.33

2

2.3

1.15

 

power factor   pf

.92

.98

.94

.94

 

 

 

 

 

 

 

 
 

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