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DESIGN INFORMATION

The table below, contains basic design information and approximate dimensions and weight of completed power transformers. It also lists suggested voltage per turn, as well as voltage drop under load (regulation), useful for calculating secondary windings. Finally it lists which size of mounting hardware is suitable in each case.

 

The temperature rise listed is for complete transformers with equally loaded primaries and secondaries, operating at 100% duty cycle.

 

As always in  transformer design the user may vary the main parameters like duty cycle, frequency, induction level and the iron/copper ratio in order to reach specific objectives, or the next larger core size may be selected to accommodate a larger number of secondary windings, high voltage windings, multiple tapings or electrostatic screens. In every case the outcome will be a power rating different from the 60 hz/15kG power capacity listed in the table. Going the other way, when used for autotransformers at e.g. 120/240 step up or step down the power capacity is twice the listed VA rating.

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P/N 

Toroidal Core Dimensions

Weight [lbs]

Approx Power@ 60Hz 

V/Turn @60HZ 15kG

 Temp rise C Regu-   lation   app% Power Transformer approx Finished Dim.

Mount Hdw#

 Price per Epoxy Coated core

ID [in]

OD [in]

HT [in]

Build [in]

ID [in]

OD [in]

HT [in]

Weight [lb]

1-5

6-10

11-50

51-100

0

1.375

2.000

1.000

0.313

0.43

20

0.077

30

17.5

0.9

2.3

1.3

0.7

1

$2.16

$1.94

$1.84

$1.73

10

1.500

2.375

1.000

0.438

0.70

35

0.107

30

11.1

1.0

2.7

1.4

1.1

1

$2.81

$2.53

$2.39

$2.25

20

1.625

2.875

1.000

0.625

1.16

60

0.153

30

8.0

1.1

3.3

1.5

1.7

1

$3.92

$3.53

$3.33

$3.14

30

1.750

3.250

1.000

0.750

1.55

80

0.184

30

6.7

1.2

3.7

1.5

2.2

2

$4.79

$4.31

$4.07

$3.83

40

1.875

3.375

1.125

0.750

1.83

100

0.207

30

6.3

1.3

3.9

1.6

2.6

2

$5.41

$4.87

$4.60

$4.33

50

2.000

3.500

1.250

0.750

2.12

125

0.230

31

6.0

1.4

4.0

1.8

3.0

3

$6.02

$5.42

$5.12

$4.82

60

2.125

3.750

1.375

0.813

2.70

170

0.274

30

4.7

1.4

4.3

2.0

4.0

3

$7.01

$6.31

$5.96

$5.61

70

2.250

4.000

1.500

0.875

3.38

225

0.322

33

4.5

1.5

4.6

2.1

4.9

3

$8.18

$7.36

$6.95

$6.54

80

2.500

4.375

1.500

0.938

3.98

300

0.345

33

4.0

1.7

5.1

2.2

6.1

4

$9.20

$8.28

$7.82

$7.36

90

2.625

4.500

1.625

0.938

4.47

360

0.373

34

3.8

1.7

5.2

2.4

7.0

4

$10.06

$9.05

$8.55

$8.05

100

2.750

4.875

1.625

1.063

5.42

450

0.423

36

3.6

1.8

5.7

2.4

8.2

4

$11.65

$10.49

$9.90

$9.32

110

3.000

5.250

1.750

1.125

6.69

600

0.483

40

3.5

2.0

6.1

2.6

10.1

5

$13.89

$12.50

$11.81

$11.11

120

3.250

5.500

2.000

1.125

8.11

800

0.551

45

3.5

2.2

6.4

2.8

12.5

5

$16.34

$14.71

$13.89

$13.07

130

3.375

5.875

2.000

1.250

9.53

1000

0.613

48

3.3

2.3

6.8

2.9

14.5

5

$18.76

$16.88

$15.95

$15.01

140

3.500

6.125

2.125

1.313

11.06

1200

0.684

48

3.0

2.3

7.1

3.1

17.0

6

$21.30

$19.17

$18.11

$17.04

L10

1.375

2.500

0.562

0.563

0.50

20

0.077

26

14.3

1.0

2.9

0.9

0.7

5

$2.32

$2.09

$1.97

$1.86

L20

1.750

3.250

0.750

0.750

1.16

60

0.138

28

8.3

1.2

3.8

1.2

1.6

5

$3.92

$3.53

$3.33

$3.14

L30

2.250

4.000

1.000

0.875

2.25

150

0.214

35

6.5

1.5

4.6

1.5

3.2

6

$6.24

$5.62

$5.30

$4.99

L40

2.750

5.250

1.125

1.250

4.64

360

0.345

40

4.8

1.9

6.0

1.8

6.9

6

$10.35

$9.32

$8.80

$8.28

L50

3.000

6.000

1.375

1.500

7.65

630

0.506

38

3.1

2.0

6.9

2.2

11.5

6

$15.54

$13.99

$13.21

$12.43

L60

4.000

7.000

1.500

1.500

10.20

900

0.551

39

3.0

3.0

8.0

2.3

15.5

6

$19.93

$17.94

$16.94

$15.94