US1129470A - Alternating-current transformer. - Google Patents

Description

G. LE G. FORTESCUE.

ALTERNATING CURRENT TRANSFORMER.

APPLICATION FILED 0017. s, 1910. RENEWED MAY 27, 1914.

Patented Feb. 23, 1915.

a 2 gig jJQIVENTOR ATTORNEY UNITED STATES PATENT OFFICE.

CHARLES LE GEYT ronrnscun, or rmsnuneri, rnnnsri'vnnia, ASSIGNOR 'ro WEST- INGHOUSE ELECTRIC AND unmirncrunma comm, A CORPORATION or PENNSYLVANIA. I

ALTERNATING-CURRENT TRANSFOIB IMER.

To all whom it may concern Be it known that 1, CHARLES LE G. Fon- TESCUE, a subject of the King of Great Britain, and a resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have inventeda new and useful Improvement in Alternating-Current Transformers, of which the following is a specification, this application being a dlvision of application Serial No. 510,854, filed August My invention-relates to the windings and insulation of transformers which'are adapted for use with very high-voltage circuits and it has for its object to provide a winding which is so connected, and insulation which is so constructed and associated with the winding, that the manufacturing cost of thetransformer and the space occupied by it may be materially reduced, while, at the same time, its terminal voltage may be very high.

The single figure of the accompanying drawing is a sectional elevation of a trans former core and a winding arranged in accordance with my invention.

Referring to the drawing, the structure here shown comprises a substantially rectangular core 1, a low-potential winding 2 that is divided into two groups of coils which surround two opposite legs 3 and 4: of the core 1 and are separated therefrom by insulating sleeves 5, a primary winding composed of two groups 6 and 7 of relatively flat coils and insulating sleeves 8 and 9 located on the respective core legs, between the low and high-potential windings. The core legs 3 and 4 may be of any suitable form but are preferably cruciform in crosssection, in order to economize space and to reduce the mean length of turn in the coils.

In my copending application, Serial No.

series to the high-potential terminal of the transformer, certainof the connections be- Specifl cation of Letters Patent.

Original application filed August 2, 1909, Serial No. 510,854. Divided and this application flied October 8, I 1 1910, Serial No. 586,100. Renewed May 27,1914. Serial No.

tween coils being effected by means of con-- ducting plates which form parts of the inproper distribution of stress in the insulation without the use of separate conducting plates or other auxiliary means. The coils, which form parts. of the insulating sleeves, are composed of a plurality of layers 11 each containing a substantially equal number of the turns 10. The turns in the high-voltage layers which are farthest from the core legs are disposed side by side, and the turns of the other layers, from the outer ones inwardly, are spaced farther and farther apart, being quite widely separated in the inner layers nearest to the core legs. By this means, the potential is properly distributed through the insulating bushings and the layers near the core legs are as efficiently utilized as those near the high-voltage coils.

The intensity of the strain on each layer of insulation and the distribution of stress therein is predetermined, since the potential of each point of the winding is fixed.

Iv claim as my invention:

1. In electrical apparatus, the combina tion with a low-potential body, and a relatively high-potential conductor, of an insulating structure disposed between said body and said conductor and comprising a plurality of concentric insulating cylinders and means constituting apart of the conductor for determining distribution of stress in the insulation.

2. In a transformer, the combination with a magnetizable core, and a winding therefor having a plurality of coils arranged end to end, of an insulating sleeve disposed between said core and said winding and comprising a plurality of layers and a series of convolutions of electric conductor distributed between the layers, the convolutions of each layer being included electrically between pairs of the coils.

3. In electrical apparatus, the combination with a low-potential body and a relatively high-potential conductor, of an insulating structure disposed between sald body and said conductor and embodying means constituting a art of the conductor for determiningthe distribution of stress in the insulation.

4. In an electrical device, the combination with a core, and an insulating sleevefi surrounding the core, of a winding comprising a plurality of coils embedded in, and separated by, the insulating sleeve, the end convolutions of the coils being adjacent to the ends of the sleeve.

'5. In an electrical device, the combination with a core, and an insulating sleeve surrounding the core, of a winding comprising a plurality of substantially concentric coils embedded in, and separated by, the insulating sleeve, the end convolutions of the coils being adjacent to the ends of the sleeve and the convolutions of the inner coils being speiced farther apart than those of the outer cm s.

6. In an electrical device, the combination with arcore, and an insulating sleeve that surrounds the core and is tapered from an intermediate point toward its ends, of a insulating sleeve, the end convolutions of the coils being adjacent to the ends of the steps in the sleeve. 4

8. In an electrical device, the combination with a core, and an insulating structure surrounding the core having stepped ends, of

a winding comprising a plurality of coils separated by the insulating structure, the

end convolutions of the coils being adj acent to the ends of the steps in the insulating structure.

In testimonywhereof, I have hereunto subscribed my name this 23rd day of Sept,

CHARLES LE GEYT FORTESQUE. Witnesses:

HELEN BURTON, B. B. Hmns.

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