Bespoke Three Phase Transformers

Bespoke Three Phase Transformers

Description

Three phase transformers are generally ‘Isolation’ types constructed on 3 phase ‘3UI’ laminations or cut-strip assemblies with 3 dual wound coils, one mounted on each leg. Each coil has a safety earth screen between the windings. Interconnection of the windings on the three legs can be arranged for all valid vector group. Three phase autotransformers have three windings without the safety earth screen usually connected in the ‘Yyn0’ configuration.

Power Capability : Up to 100kVA. Higher on request
Voltages : Standard up to 690V. Up To 11kV available
Insulation Class : B, F or H Class 200 on request
Ambient : 40°C max as standard. Others on request
Temperature Rise : Dependant on insulation class
Terminals : Screw or Stud, Touchproof. Flying leads on request

 

Options for open style

  • Fuses
  • Thermal protection
  • Tropical varnish

Transformers can be supplied in a range of enclosures from IP22 to IP65.
Options for enclosed style

  • Fuses
  • Thermal protection
  • MCBs & RCDs
  • Plugs & sockets
  • Isolators
  • Meters
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
Rating
Width
Depth
Overall Height
Weight
IP22 Enclosures
Click for
Drawing
pdf
dwg
200VA
110
100
120
3.5
WM2
500VA
190
140
185
7
WM5
750VA
190
160
185
10
WM5
1kVA
210
120
230
13
WM5
1.5kVA
250
130
250
15
FM00
2kVA
250
150
250
20
FM00
3kVA
310
160
310
28
FM00
4kVA
310
180
310
36
FM00
5kVA
310
200
310
45
FM00
6kVA
370
175
360
48
FM0
7kVA
370
185
360
55
FM0
8kVA
370
195
360
65
FM0
9kVA
370
210
360
80
FM0
10kVA
370
220
360
85
FM0

12kVA
430
190
420
90
FM2
15kVA
430
220
420
110
FM2
20kVA
490
220
480
140
FM2
25kVA
490
300
480
190
FM2
30kVA
550
270
520
230
FM2
40kVA
550
320
520
280
FM2
50kVA
620
310
570
350
FM3
75kVA
620
330
570
380
FM3
80kVA
620
340
570
400
FM3
90kVA
730
350
680
530
FM4
100kVA
730
360
680
550
FM4

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 11kV 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 800KVA

 

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