US2006817A - High-potential electric condenser - Google Patents

Description

July 2, 1935. w. vole-MANN HIGH POTENTIAL ELECTRIC CONDENSER Filed Feb. 8, 1932 lNvENToR mma voxsm NN BY /w-v-(/ ATTOR NEY Patented July 2, 1935 UNITED STATES HIGH-POTENTIAL ELECTRIC CONDENSER Walter Vogtmann, Berlin, Germany, assignor to Telefunken Gesellschaft fr Drahtlose Telegraphie m. b. H., Berlin, Germany, a corporation of Germany Application February 8,

1932, Serial No. 591,560

In Germany May 13, 1931 5 Claims.

This invention relates to improvements in high potential electric condensers of the sheet stack Ype- The object of this invention is to improve construction of the condenser stack in order that it will stand high voltage stress without breakdown.

A feature of this invention is the particular arrangement of the insulating separators to improve the completely assembled condenser stack.

In high-potential condensers used in the electrical engineering arts comprising adjacent series-connected sections it is the general custom to interpose insulating laminae or separators be tween adjacent sections the ends of which protrude at the points between non-joined foil lugs ofthe neighboring sections beyond the tops or heads of the lugs.

According to the parent German Patent No. 539,014 to the said insulating lamnae there are added still shorter insulating plates or lamin of substantially greater thickness than the thickness of the inner dielectric layers of the condenser sections which do not project beyond the edges of the pile or packet of condenser sections or at least -only slightly so.

This invention consists of other features and methods of construction as disclosed and described in the accompanying drawing. In the drawing like references refer to similar parts, of which:

Fig. 1 is a vertical cross section of a series sectional stack of my parent patent application;

Fig. la is a partial vertical cross section of the series sectional stack of Fig. 1 showing the foil lugs out of their normal position;

Fig. 2 is a vertical cross section with my improved series sectional stack;

Fig. 2a is a partial vertical cross section of Fig. 2 showing the foil lugs out of their normal position.

An embodiment described in the above mentioned German parent patent is here shown in Fig. 1 in which A B F G are the constituent condenser sections which are connected in series, for instance, by soldering together the ends of the foils or lugs M. J denotes the longer separating laminae made from insulation material which at the places between unconnected lug heads of neighboring condenser sections project beyond the said lug heads. At K are indicated the further reinforcing separator plates which are added to the lamin before mentioned and which project beyond the edges of the pile of condenser sections only slightly or, if possible, not

at all. By the aid of this arrangement a far more favorable eld distribution is secured than in the case where the additional separator lamina: K (as indicated in Fig. l for the separation between the sections F and G by dotted lines) have the same length as the plate J. However, the said advantageous effect willbe permanently secured only if the heads of the lugs of the condenser sections are sufficiently rigid in order to preserve their proper form permanently. But this is not always the case. Indeed, it happens quite frequently that due to different agencies, for instance, by pressure and thermal treatment during impregnation or owingto accidental shock in shipping, etc., the lugs are bent out of their normal position as shown in Fig. la. The advantageous insulation effect of the reinforcing plates K will as a result be seriously impaired with.

Now, according to the present invention the said drawback is obviated by that the layers of longer and shorter separator plates compared with the disposition shown in Fig. 1 are interchanged, in other words, in this manner that the shorter plates K are interposed between the longer plates J.

In the embodiment shown by way of example in Fig. 2 it will be seen that in this arrangement between pairs of insulator plates J separating neighboring-condenser sections and whose ends project beyond the non-united lug heads of neighboring sections the additionalplates K are inserted which as far as feasible do not protrude beyond the edges of the pile of condenser sections or at least but slightly so. If the lug heads in this arrangement should happen to be bent out of their normal position .as shown approximately in Fig. 2a they will nevertheless remain separated both by the interposed plates J as well as by .the layer 0f air (the thickness of which corresponds to the thickness of the plate K), with the result that the favorable eld distribution remains practically preserved.

Although this invention has been described as embodied in a particular form or` arrangement of parts,'it should be understood that it is capable of being embodied in other and different forms within the spirit and scope of the appended claims such as the plates J and K need not consist of a single insulation lamina, but 'that each may consist of a plurality of thin superposed lamin.

I claim:

1. A high potential electric condenser comprising a stack of sections composed of a plurality of assembled insulated sheets and foils, said foils alternately assembled with said insulating sheets to form series sections, the foils of each of said series sections being alternately assembled and connected by solder and separated by a group of insulated plates, having a central insulated portion of substantially equal area as the sections but of greater thickness than the insulated sheets of said sections, and additional insulated separator plates interposed between said central insulated portion and said sections, said additional insulated separator plates extending alternately beyond the area of said sections inl the region of the soldered-foils to provide an air space equal to the Width of the central insulated portion, and an area greater than said soldered foils.

2. A high potential electric condenser comprising a stack of sections composed of a plurality of alternately assembled insulated sheets of insulation and foils, the foils of each of said sections being alternately assembled and connectedk together in series by solder to form a stack of series sections, each of said series sections being separated by three insulated plates, the central insulated plate being of equal area but greater thickness than the insulated sheets of said sections, and the two outer insulated plates which are interposed between said central insulated plate and said sections, each of the two said outer insulated plates extending valternately beyond the area of said sections in the region of the soldered foils to provide an air space equal to the width of the central insulated plate, and an area greater than said soldered foils.

3. In a high potential electric condenser comprising a stack of sections composed of insulated sheets and metallic foils, said foils assembled on said sheets with the foils projecting alternately beyond the end of the insulated sheets, said sections spaced apart from each other by a pair of insulating separators, each pair of separators projecting beyond the foil projection of said sections in alternate manner, and a central insulating lamin of substantially the same area but of greater thickness than the insulated sheets interposed between the insulating separators.

4. In a high potential electric condenser comprising a stack of sections composed of insulated sheets and metallic foils, said foils assembled on said sheets with the foils projecting alternately beyond the end of the insulated sheets, said sections having the projecting foils joined in series by solder forming a connection foil lug, said sections spaced apart by a plurality of thin superposed insulating separators which project beyond the foil lugs in alternate manner, and acentral insulating laminas of substantially the same area but of greater thickness than the insulated sheets interposed between the insulating separators.

5. In a high potential series condenser stack comprising a plurality of sections serially connected and having their projecting foils coated with solder and alternatelyjoined together to form a series sectional stack, an insulating separator adjacent each section, said separator assembled so as to project beyond said foils, and a central insulating member interposed between said separator, said insulating member being of substantially the same area as said sections, but

WALTER VOIGIMANN.

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