Inductor devices – With supporting and/or spacing means between coil and core – Preformed insulation between coil and core
Reexamination Certificate
1999-06-16
2001-12-04
Mai, Anh (Department: 2832)
Inductor devices
With supporting and/or spacing means between coil and core
Preformed insulation between coil and core
C336S208000, C336S012000, C336S005000
Reexamination Certificate
active
06326877
ABSTRACT:
DESCRIPTION
1. Technical Field
The present invention relates generally to transformers and winding structures of transformers. More particularly, the present invention relates to a support arrangement used within the winding structures of transformers during and after the manufacture of transformers to, at least, maintain the integrity of the windings and the winding structures during and after the manufacturing process.
2. Background of the Invention
In the past, transformer winding structures have included a rigid coil or winding base, or support, which adds significant stiffness to the coil or winding during the manufacturing process. Without any support, the conductor winding can cause the overall winding structure to collapse into the interior portion or hollow core (leg) region of the transformer winding structure. The support assists in maintaining integrity of the winding(s) during and after the manufacturing process, eases assembly of the transformers and the winding(s), and provides added short circuit strength during fault conditions in view of the added support and strength of the windings of the transformer. In the past, the rigid winding base or support has been a single elongated tube-like structure which extended from the top interior portion of the transformer winding structures to the bottom of the interior portion of the transformer winding structures. These elongated supports are typically expensive. For example, using three elongated supports for a three-phase transformer (each of the three winding structures of a three phase (leg) transformer would use one elongated support), could add over $1,000 of cost to such a transformer.
The present invention is provided to solve these and other problems.
SUMMARY OF THE INVENTION
The present invention relates to a winding structure for a transformer. The winding structure has a first support having a central axis, and a second support also having a central axis. The second support is positioned having its central axis generally in-line with the central axis of the first support. The winding structure also has a winding which is wrapped around at least a portion of the first and second supports. The supports are provided for at least supporting the winding. The present invention also relates to a method of making a transformer comprising the steps of providing a mounting apparatus, and mounting a first support having a central axis on the mounting apparatus. The method also includes mounting a second support having a central axis on the mounting apparatus, wherein the second support is mounted on the mounting apparatus with its central axis mounted generally in-line with the central axis of the first support. In addition, the method includes winding a conductor around at least a portion of the first and second supports to form a winding.
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Medium Voltage Transformers Selection Guide, Square D Company Mar. 1997, pp. 1-16.
Uni-Cast Coil Transformers, Square D Groupe Schneider, Mar. 1993, pp. 1-8.
Hay Noah D.
King Gary D.
Mai Anh
Square D Company
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