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The System at a glace
All areas of electrical and electronic technology are exploding with new developments. But design and construction of lower voltage dry transformers has shown little progress in the last years. This has changed dramatically with the introduction of our new Coil Cage System to the European market. This system cuts costs and considerably simplifies the construction of dry transformers in the rage of 5 KVA to 100 KVA
Advantage of the Coil Cage System
- good heatdissipation
- through chimney effect
- high heatresistantace
- usable for all sizes
- low stockcosts
Shape and design
The Coil Cage System uses a self supporting cage structure. This permits the manufacture of vented transformers with spacer elements between primary and secondary coils,eliminating all fixturing. Since core, spaces elements, and coils are all held in place by the rigid cage structure, the manual operation of coil winding is drastically simplified.
Highly heat resistant pultrusion-molded fiberglass profiles, which can be produced in any desired length, are used as vertical support for core and windings. Horizontal end frames rigidly hold the vertical support elements in place and give the coilbody ist shpe and rigidty.
The cross section of the vertical elements is standardized to simplify inventory. The endframes on the other hand can be produced in any desired size and shape thus making possible any size and shape of bobbin. End frames are produced either as monolithic frames or as modular units consisting of standardized rigid corner pieces connected by spacer elements of varying lengths, again with simple inventory in mind. The siderail guides in the end frames are continuous, allowing construction of transformers with multiple coil layers.
Conclusion
The Coil Cage System offers the transformer design engineer a truely unique system of easily adapteble components, giving him complete flexibility in optimizing design andconstruction of dry transformers in the range beween 5 KVA and 100 KVA. The modular concept combined with the low cost of elements makes the system just as useful for small series or even single units as for large series.
The creation of air spaces through use of vertical spacer elements in combination with cutouts in the end frames improves heat dissipation substantially and allows either an increase in current density or a reduction in copper consumption of up to 30% as compared to more traditional compactly wound transformers.
Where spacer elements are now in use, production managers welcome the grat simplification of assembly using the end frames. This substantially reduces labor costs as well as requirements.
Accessories
To further simplify the manufacturing process we recommend the use of our polyester-shrink-tape to stabilize the transformer coils. The ends are connected by simply knotting, glueing, or soldering. Heating transformer and tape to the desired temperature lets the tape shrink and thus creates a substantial tensile force in the tape, resulting in high mechanical stability of the unit. Properly impregnated rhis tape will withstand temperatures of up to 220°C.
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