US3736542A

US3736542A - High voltage transformer

Info

Publication number: US3736542A
Application number: US00153310A
Authority: US
Inventors: H Ashe
Original assignee: Individual
Current assignee: Individual
Priority date: 1971-06-15
Filing date: 1971-06-15
Publication date: 1973-05-29
Anticipated expiration: 1990-05-29

Abstract

A high voltage transformer whose primary and secondary windings are separated by a lamination of solid insulation and conductive sheets alternately arranged. The conductive sheets are charged with discrete direct current voltages to provide a predetermined voltage gradient across the composite insulator structure. In a preferred embodiment the insulating components and the conductive components are in the form of concentric cylinders.

Description

United States Patent 91 Ashe [54] HIGH VOLTAGE TRANSFORMER [76] Inventor:

Monica, Calif. 90403 [22] Filed: June 15, 1971 [21] Appl. No.: 153,310

[52] US. Cl. ..336/70, 336/84, 336/223 [51] Int. Cl. ..H0lf 15/00 [58] Field of Search ..336/84, 69, 70, 223

[56] References Cited UNITED STATES PATENTS Harry Ashe, 1040 Euclid St., Santa 1 3,736,542 51 May 29,1973

2,388,848 11/1945 Howe ..336/84 X FOREIGN PATENTS OR APPLICATIONS 1,271,669 8/1961 France ..336/84 Primary Examiner-Thomas J. Kozma Attorney-Harry A. Herbert, Jr. and Willard R.

Matthews J r.

[57] ABSTRACT A high voltage transformer whose primary and secondary windings are separated by a lamination of solid insulation and conductive sheets alternately arranged. The conductive sheets are charged with discrete direct current voltages to provide a predetermined voltage gradient across the composite insulator structure. In a preferred embodiment the insulating components and the conductive components are in the form of concentric cylinders.

1 Claim, 2 Drawing Figures PATENTEDMY'ZQ 197s :F'IE .1

- mvsw'ron HARRY- vASH a/ Km ATTORNEYS BACKGROUND OF THE INVENTION This invention relates to high voltage transformers and in particular to new and improved means for insulating the transformers primary and secondary windings.

The manufacture of high voltage transformers has in the past required costly equipment and has, in general, produced large cumbersome devices. In order to support the high potentials between primaries and secondaries, it has been customary to resort to oil impregnation and oil filled casings. Impregnated paper insulation often has to be toroidally wound around the transformer windings. The-oil filled units are both costly and cumbersome. The alternative brute force" method of simply using thicker insulation becomes impractical when very high voltages are encountered. In order to reduce the size of high voltage transformers potting in an insulation type thermoset plastic has been used. This approach however, requires expensive pressurevacuum systems and long fabrication times (due to the cooling cycle of the plastic insulation material). There currently exists therefore, the need for a transformer manufacturing technique that eliminates much of the bulk and inconvenience of oil impregnated and oil filled transformer and that does not require costly and time consuming fabrication equipment and procedures.

' The present invention is directed toward accomplishing these and other ends.

SUMMARY OF THE INVENTION drical segments of solid insulation are concentrically arranged with layers of conductive material between adjacent insulators. A uniform potential gradient is maintained across the composite insulation structure by means of direct current voltages applied to the conductive layers. There is thus provided an insulating structure that can be easily fabricated and assembled and that supports maximum voltage for any given insulation thickness.

It is a principal object of the invention to provide a new and improved high voltage transformer.

It is another object of the invention to provide, in a high voltage transformer, voltage insulating means that can be easily fabricated and assembled.

It is another object of the invention to provide insu lating means for use in a high voltage transformer that supports maximum potential for any given insulation thickness.

It is another object of the invention to provide a high voltage transformer having solid insulating means between its primary and secondary windings.

These together with other objects, features, and advantages of the invention will become more readily apparent from the following detailed description when taken in conjunction with the accompanying drawings.

DESCRIPTION OF DRAWINGS FIG. 1 is a sectional view of a high voltage transformer embodying the principles of the present invention; and,

FIG. 2 is a sectional view of the high voltage transformer of FIG. 1 taken at 22.

DESCRIPTION OF PREFERRED EMBODIMENT Referring now to FIGS. 1 and 2, there is illustrated thereby one presently preferred embodiment of the invention. Primary winding 5 which may be an appropriate insulated wire as dictated by the specifications of the transformer is wound around core member 3 and insulated therefrom by insulation layer 4. In practice, of course, core 3 and insulation 4 can be replaced by a simple coil form. The insulation structure between primary winding 5 and secondary winding 13 comprises a multiplicity of concentric cylindrical members that are alternately of insulating and conducting material. Cylindrical members 6, 8, l0 and 12 are fabricated of solid insulating material.

Cylindrical members

7, 9, and 11 are thin metal members. All cylindrical members fit in close contiguity. Secondary winding 13 comprises many turns of appropriate insulated wire wound over cylindrical insulating member 12. The outer surface of secondary winding 13 is also covered with appropriate insulation. Primary leads 16 and secondary leads 15 are brought out of the transformer in the conventional manner. Since it is not pertinent to the invention insulation at the ends of the transformer is not shown. It would in practice normally be used however. A direct current supply 20 provides a certain bias to each of the conductivecylindrical members. These biases are selected to provide the desired voltage gradient across the composite insulation structure. Insulation materials and thickness, primary and secondary wire size and turns, and the various direct current bias values are of course design details to be dictated by the specifications of the particular transformer being fabricated.

While the invention has been described in its preferred embodiment, it is understood that the words which have been used are words of description rather than of limitation and that changes within the purview of the appended claims may be made without departing from the true scope and spirit of the invention in its broader aspects.

What is claimed is:

1. A high voltage transformer comprising acore member of permeable material, a layer of insulation thereon, a primary winding wound over said layer of insulation, an insulating structure disposed over said primary winding, said insulating structure comprising outer surface of said secondary winding.

Claims

1. A high voltage transformer comprising a core member of permeable material, a layer of insulation thereon, a primary winding wound over said layer of insulation, an insulating structure disposed over said primary winding, said insulating structure comprising not less than five concentric members of insulation and conductive materials alternately arranged such that the inner and outer cylindrical members are of insulation material, means for applying a discrete direct current voltage to each said conductive cylindrical member, said discrete voltages having relative values that provide a uniform potential gradient across said insulating structure, a secondary winding wound over said insulating structure, and insulating means disposed on the outer surface of said secondary winding.