Solid cast resin coil for high voltage transformer, high voltage

Details Solid cast resin coil for high voltage transformer, high voltage Solid cast resin coil for high voltage transformer, high voltage

1998-11-12

2000-12-12

Kozma, Thomas J.

Inductor devices

With temperature modifier

Ventilating passages

336 61, 336 96, 336205, 336206, 336225, H01F 2708, H01F 2730

Patent

active

06160464&

ABSTRACT:
A dry-type transformer having an iron core, with high voltage and low voltage coils encapsulated in casting resin. The high and low voltage windings may be cast separately, or together. Either or both of the coils may have integral axial cooling channels, as may the annular axial space between the inner and outer windings (usually low voltage and high voltage, respectively). Coil cross-section is a modified oval (Rectoval.TM.) shape, in that the sides of the coil are substantially linear and the ends of the coils are substantially semi-circular. The aspect ratio (L/W) of the coil, when viewed in radial cross-section, ranges from greater than 1.0 to about 2.5. The rectangular nature of the coil allows for the use of a core member having a rectangular cross-section, thereby reducing the manufacturing expense involved with shaping the core member. The circular nature of the ends of the coil provide improved strength similar to that of circular/cylindrical coils. This specific coil cross-sectional shape gains the benefits of reduced "footprint" (in the width dimension), shorter magnetic path-length (reduced core losses), and reduced material content (cost) in the transformer. This specific coil shape also allows for the use of molds constructed using standard modularized rounded pieces for the ends of the coil, together with simple flat side spacer plates, to cover any given kVA size range. Encapsulating material, such as epoxy resin having macro fibers of Wollastonite for reinforcement dispersed therethrough, is disposed about and throughout each winding, to thereby form an integral, monolithic coil structure. The windings are additionally reinforced in both the axial and circumferential directions, by the incorporation of a woven fiberglass mesh proximate to all vertical coil surfaces exposed to either natural convection, or forced blowing. As a result of this dual reinforcement, the coils exhibit high short circuit withstandability, in spite of their departure from the more common circular/cylindrical shape heretofore known in the prior art.

REFERENCES:
patent: 1452158 (1923-04-01), Horelick
patent: 2710947 (1955-06-01), Gaston
patent: 3170134 (1965-02-01), Palmer
patent: 3195084 (1965-07-01), Book
patent: 3748616 (1973-07-01), Weber et al.
patent: 4173747 (1979-11-01), Grimes et al.
patent: 4337569 (1982-07-01), Pierce
patent: 4523169 (1985-06-01), Hay
patent: 5267393 (1993-12-01), Purohit et al.
patent: 5396210 (1995-03-01), Purohit et al.
patent: 5621372 (1997-04-01), Purohit

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