Products
-> Single
Phase Transformers -> Above 7kVA - Durham Range
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Above
7kVA - Durham Range |
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 The
Durham range of transformers are generally ‘Isolation’
types and constructed on ‘UI’ laminations
with two dual coil windings mounted one on each leg.
Each coil has a safety earth screen between the windings.
Autotransformers follow a similar construction but have
a single winding on each leg with no safety earth screen.
- Double Wound Construction
- Earth screen between windings
- Varnish impregnation under vacuum
Power Capability :
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7.0kVA to 100kVA. Higher on request |
Voltages :
|
Up To 6.6kV |
Insulation Class :
|
F, H or Class 200 on request |
Ambient :
|
40°C max as standard. Others on request |
Temperature Rise :
|
Dependant on size |
| Terminals : |
Screw or Stud, touchproof. Flying leads on request |
Angle Frame
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Tie-rod Frame |
 Small
assembly for transformer
ratings from 7.5kVA to
approximately 25kVA manufactured
using ‘UI’ punched laminations |
 Large
assembly for transformer
ratings from approximately 25kVA
to 100kVA manufactured using low
loss cut strip magnetic steel |
Transformers can be supplied in a range
of enclosures from IP22 to IP66
The following table indicates typical sizes
of ‘Open Style’ transformers for various
power ratings of low voltage units (<700V).
Please note these may vary slightly as the specific
voltage requirements determine the final transformer
design.
For an ‘Enclosed Style’ transformers
click the box link for dimensional drawing
Note the inclusion of some optional components
may result in a size increase of the indicated
enclosure type
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Rating
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Width
(mm)
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Depth
(mm)
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Height
(mm)
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Weight
(kg)
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IP22
Enclosures |
Click for
Drawing |
| pdf |
dwg |
8kVA
|
250
|
200
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360
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60
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FM0 |
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10kVA
|
290
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220
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420
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80
|
FM0 |
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12kVA
|
290
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240
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420
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90
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FM2 |
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15kVA
|
330
|
210
|
470
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105
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FM2 |
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20kVA
|
330
|
260
|
470
|
145
|
FM2 |
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25kVA
|
330
|
240
|
470
|
135
|
FM2 |
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30kVA
|
370
|
250
|
520
|
155
|
FM3 |
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40kVA
|
410
|
250
|
580
|
200
|
FM3 |
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50kVA
|
410
|
270
|
580
|
230
|
FM3 |
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60kVA
|
410
|
300
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580
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270
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FM3 |
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75kVA
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500
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270
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680
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320
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FM4 |
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80kVA
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500
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290
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680
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335
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FM4 |
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90kVA
|
500
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310
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680
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390
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FM4 |
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100kVA |
580 |
350 |
780 |
420 |
FM4 |
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For transformers enclosed in high IP rated boxes i.e.
non-ventilated, the size of both the transformer and
the enclosure has to increase to avoid overheating.
Dimensions on request.
Units with voltages greater than 700V up to 6.6kV can
be manufactured however the insulation requirements
of these transformers will require a larger build size
for the specific rating
Units can also be designed and manufactured with ratings
up to 500kVA.
Installation/Safety
Instructions
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Isolation Transformers |
Autotransformers |
| Open Style |
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| Enclosed |
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