US1870141A - High tension condenser - Google Patents

Description

g- 1 w. REGERBIS ET AL 1,370,141

HIGH TENSION CONDENSER Filed Aug. 3, 1929 8 Sheets-Sheet 1 al H9 7 F/g. U

Aug. 2, 1932.

w. REGERBIS ET AL HIGH TENSION CONDENSER Filed Aug. 5. 1929 8 Sheats-Shaet 2 g- 2, 1932- w. REGERBIS ET AL 1,370,141

HIGH TENSION CONDENSER Filed Aug. I5. 1929 8 Sheetas t 3 Aug. 2, 1932. w. REGERBIS ET AL HIGH TENSION CONDENSER Filed Aug. 3, 1929 8 sheets-Sheet 4 I'llll 2, 1932- w. REGERBIS ET AL HIGH TENSION CONDENSER a sneetyshee-t' '5 Filed Aug. 3. 1929 Aug. 2, 1932. w. REGERBIS ET AL HIGH TENSION CONDENSER Filed Aug. 3, 1929 v 8 Sheets-Sheet 6 Aug. 2, 1932.

w. REGERBIS ET AL HIGH TENSION CONDENSER Filed Aug. 3. 1929 '8 Sheets-Sheet 7 A g= 1932- w. REGERBJS ETA.

HIGH TENSION CONDENSER Filed Aug. 3, 1929 8'Sheets-Sheet 8 Fig. 15

Jnvenfars:

Patented Aug. 2, 1932 UNITED STATES PATENT. OFFlCE WILHELM. REGERBIS, OF HERMSDORF, AND MARTIN HANDTRAG, OF IBERLIR- FRIEDENA'U, GERMANY, ASSIGNORS T HERMSDORF-SGHOMBURG ISOLATOREN,

HIGH TENSION CONDENSER Application filed August 3, 1929, Serial No. 388,245, and in Germany August 3, 1928.

Our invention concerns improvements in electrical high-tension condensers, more particularly in such as are used in so-called wired wire-less systems in which high frequency currents are to be transmitted to high-voltage lines for signalling or communicating pur poses.

( Condensers of this kind are subject to various extreme requirements which, prior to our invention, could not satisfactorily be complied with. The failures experienced in the past were caused by selection of unsuitable materials for the dielectric parts and by unsuitable dimensions and shapes thereof.

The condensers which have most extensively been used in practice consist of an impregnated paper-tube provided with internal and external metal linings. This dielectric must be protected from atmospheric in so fluences, particularly from moisture and, for this purpose, the paper condenser was enclosed in a porcelain casing. Such a porcelain casing, however, is objectionable in that it re quires the use of filling materials between its walls and the condenser proper which filling materials give rise to troubles. Moreover, the dielectric material employed in paper condensers causes considerable dielectric losses.

In order to avoid these disadvantages the use of porcelain or glass as a dielectric for high-tension condensers has been suggested prior to our invention. The constructions developed along these lines, however, could 5 not successfullysatisfy the extreme requirements'which must be met with in practical operation.

A condenser of the typev to which the present invention relates comprises a condenser 40 portion proper provided with internal and external conductive linings or coatings and a lead-through portion serving to' insulate the conductor extending from the inner lining of the condenser part 'to the outer terminal which is subjected to the full force of the high voltage. It will be observed that, in such a condenser, unintended marginal discharges between the outer terminal and the outer lining of the condenser portion must be avoided. One of the objects of our invention the lower terminal as is necessary for the operation with high voltages.

These and other o'b'ects of our invention which will appear from the description following hereinafter are attained by a condenser in which the condenser portion proper is formed by a thin-walled substantially cylindrical hollow body of a silicic material, such as porcelain or glass, which is sealed at one end by a suitable end-wall and provided, with an inner and an outer conductive coating. This condenser portion is attached to, preferably integral with a leadthrough portion likewise constituted by a thin-walled hollow body of porcelain or glass provided with ribs or pettlcoats to counteract discharge thereover. The shape of the lead-through portion may be cylindrical or conical or'barrel-like.

When referring in the claims to silicic material we mean to define thereby glass or porcelain or ceramic materials similar to porcelain such as earthen-ware or the like.

Our novel condenser may be manufactured in various ways. While we prefer, as a rule, to make both portions integral in one piece, it is sometimes advantageous to produce both portions in different pieces as this affords a possibility of using different materials for both of them, each portion being made from a composition which is particularly adapted to meet the special requirements. The dielectric. of the condenser portion, for instance, must have an extreme dielectric resistibility against puncture and a very high dielectric coeflicient, while the lead-through portion needs a very high mechanical and thermic resistibility. In case of the condenser being formed of two non-integral portions, the condenser portion may be more or less telescoped into the lead-through portion whereby the entire height of the structure may be kept low and the condenserportion may be arranged in a protected position.

. In the latter case we sometimes prefer to enclose the condenser part in a metal housing attached to the lead-through part. If this arrangement is chosen the condenser part may be relieved from mechanical strains in favour of a greater reliability in operation. This arrangement provides, moreover, for a possibility of forming the condenser part from a ceramic material which need not have any appreciable mechanic resistibility but may be elected to solely comply with the requirements of suitable dielectric properties.

A feature of particular importance is the connection between the conductor and the conductive condenser coatings. We form this connection either by soldering, or by contact springs suitably pressed against the coating.

To adapt the structure to extremely high voltages we connect a plurality of individual condensers in series to form a chain comparable with the well-known insulator-chains. For this purpose, both ends of the individual condensers are provided with suitable fittings similar to those of chain-insulators.

Another feature of our invention resides in a specific shape of the inner surface of the condenser portion which will favorably influence the electric field distribution, as will be explained in the description following hereinafter.

In the accompanying drawings a number of embodiments of our invention are. illustrated.

Fig. 1 is an elevational view, partly in section, of an embodiment in which condenser port-ion and lead-through portion are integral with each other;

Fig. 2 is a similar view of another embodiment;

Figs. 3, 4, 5, 11 and 11a represent various embodiments some of which have integral condensers and lead-through portions while in other embodiments these portions are formed by separate parts suitably connected to each other;

Fig. 6 illustrates an alternative form of the portion shown in the lower part of Fig. 5;

Figs. 7. 8 and 9 represent various alternative cons ructions of a detail shown in Fig. 5;

Fig. 10 shows an element which may be substituted for the annular coil 23 in Fig. 5;

Fig. 12 is similar in certain respects to Fig. 5;

Fig. 13 shows an alternative form of the lower portion of the condenser represented in Fig. 12;

Figs. 1 to 17 show different constructions in which the leatl through part is arranged below the condenser part;

Figs. 14 and 16 represent the arrangement of a plurality of condensers in a chain. Fig.

18 depicts a structure incorporating most of the novel features of our invention.

In the construction illustrated in Fig. 1, a comparatively thin-walled body of suitable silicic material such as porcelain comprises an upper part Z) similar to a lead-through insulator and a lower part (L constituting the condenser proper. The condenser portion is provided with an internal conductive sheath 2 while an external sheath 1 is arranged on the exterior surface commencing approximately in the middle portion of the body and extending to the lower end thereof. The part covered by this exterior sheath 8 constitutes the condenser portion a proper.

The upper and the. lower end of the body are provided-with covers 4 both having littings 6, such as are customary in chain-insulators, permitting of arranging a number of such condensers in series. The exterior sheath 1 of the condenser portion is electrically connected to the lower cap 4 while the interior sheath 2 is connected to the cap 5 by a conductor 7 which at its upper part is insulated by a paper sleeve 13 or otherwise. The lead-through portion 6 functions to insulate this conductor 7, the petticoats 3 preventing surface discharge between the margin of the sheath 1 and the cap 5. The inner sheath 2 may be limited to the portion a of the condenser, if desired. The exterior sheath 1 terminates within a turned-down petticoat 8.

The condenser need not be arranged in vertical position but may be mounted to have an inclined or horizontal position. It could also be turned upside down with reference to Fig. 1. In this case the petticoats would have to be slightly changed.

In such a condenser, surface discharges may occur between the two lowest sheds adjacent the rim of the exterior coating unless special precautions be taken to avoid excessive field intensities in the neighborhood of that rim.

With a View to this object we provide the inner wall of the condenser at a point between the two sheds nearest the outer "coating preferably at a point approximately opposite the gutter in which the outer coating on the condenser terminates, with an annular rib projecting obliquely upwards, an oil or other filling being with advantage also provided at this point by shaping said rib. to create a container therefor.

In the embodiment shown in Fig. 1 an an- I nular rib 9 is provided projectingobliquely and upwardly from the inner wall of the ceramic body at that point of the wall which lies between the two external sheds 3 which are nearest to the support, the inner surface of said rib being provided with a conductive. sheath extending to or almost to the edge 10 in such a manner that this conducting sheath in the form of a concave constitutes an unbroken extension of the inner sheath 2 of the condenser. Alternatively, however, a funnellike wall ll may be provided, as illustrated in Fig. 2, which forms a chamber 12 which can be filled with oil or other filling material. The concentrated electric field near the margin of the sheath will thus be situated within a dielectric other than air.

The occurrence of the above-mentioned surface discharge is prevented by either of these precautions.

In Fig. 3 the ceramic condenser consists of a condenser portion a and a lead-through portion b which are prepared out of one piece. As in Figs. 1 and 2 it is provided with sheds 3 on the upper surface and has, beneath the lowest shed, a hollow channel or concave 8. Approximately at the position of the lowest shed, the inner surface is provided with an annular rib 11, which is extended so far upwardly that it surrounds the lead-in electrode 7 for a certain distance. filling 12 extends according to requirements, for example, up to the point 14, where appreciable stresses due to the electric field no longer occur in the hollow space of the upper portion which resembles a lead-through bushmg. I

At the position where the hollow channel or concave 8 is provided, the body of the condenser is suitably constricted and this, in conjunction with the above-mentioned characteristics has the effect that the electric field is almost entirely restricted to the insulating material, and consequently glow and surface spark discharge at the edges of the coating cannot occur. In this manner the requisite very high degree of safety is obtained for high tension condensers of the kind mentioned, which, for example, are used as coupling condensers for high frequency telephony.

The inner coating 2 as well as the outer covering 1, which in generalare prepared by spraying metal or by electro-chemical precipitation, are preferably reinforced by a second covering 16, which is electrolytically prepared. The connection of the inner sheath with the lead-in electrode 7 can be effected by aconnecting member 17, which is pressed firmly against the inner coating bymeans of a spring 18 inserted between a disc 19 which carries an extension rod of the member 17, and the upper cap 5. Alternatively, the intermediate member 17 may be fastened to the reinforcing covering 16 by soldering. In Fig. 3-the inner coating -2,,together with the second covering 16, is extended over the inner surface of the annular rib 11 up to approximately its upper end, and terminates here in a concave 15.

The manufacture of such ceramic bodies in which the dielectric of the condenser portion and the lead-through portion consists of a single piece at porcelain, or other material,

The oil or paste or glass, is very expensive. Generally a wastage of more than 50% must be expected on account of the peculiar form of the condenser portion with its upwardly projecting annular rib alone, whereas the lead-through portion taken alone can be made-with comparatively small losses. This disadvantage can be overcome if, as shown in Fig. 4, the ceramic body is constructed in two portions, and the two portions are subsequently fixed together. Thus itv is not necessary to throw away the complete body when the lower part, which is more diflicult to manufacture, is faulty.

As shown in Fig. 4, the condenser portion a is secured to the lead-through portion 12 by means of a metal fastening 20, in which the two portions are cemented. In all other respects, the condenser is electrotechnically identical with the embodiment of Fig.3.

The question of protection of the condenser portion against damage must be specially taken into account'in connection with the embodiments previously described and also similar embodiments, in which the condenser portion is not insertedwithin the covering 12, but is exposed beneath this latter. In such embodiments it appears advisable to provide the condenser portion with special protection against mechanical damage, as is shown in Fig. 5. Here the condenser portion,which, as in Fig. 4, is secured to the protective cover by means of a flanged ring member 20, is surrounded by a sheath 21 of sheet metal or other suitable material, which is secured to or integral with the flange 20. The condenser portion is completely protected within this sheet metal covering in the similar manner to a thermos fiaskwithin its housing.

It is also very advantageous to relieve the condenser portion a of all mechanical stresses, which may occur in the above-described embodiments when a further high tension condenser of a series is attached to the condenser portion. This is effected, as shown in Fig. 6, by securing to the lower part of the protective sheath 21, a base 22 which is provided with a fork-shaped extension 6,

to make possible the attachment of a further condenser. The flange 20, sheath 21 and base 22 can be. made in a single piece, so that the body formed thereby is in the shape of a j ar.

Attention must also be'given to the connection of the conductive coatings with the terminals of the condenser, as excessive heating of the dielectric and in consequence breakdown and injury to the metal sheath would be caused by bad contact. very suitable method and manner of conductively connecting the inner coating with the armature is by means of resilient contact members such as member 17 shown in Figs. 3 and 4. In similar manner the conductive connection with the outer coating of the condenser p'or- Figs. 12 and tion a can be effected by the insertion of a spring between the outer condenser coating and the sheet metal protective sleeve 21 which constitutes one of both terminals of the condenser. I

Various forms of inserted leaf springs 28, 29, 3.0, 31 are shown in Figs. 5 to 9, and require no further description. In Figs. 7 and 9 s '-ch springs are secured to the sheet metal sleeve 21, and contact with the coated outer surt'ace of the. condenser part a. In Fig. 8 the opposite arrangement is used; the springs are secured to the coated insulator wall 2 by means of a strip 32, and are in resilient contact with the sheet metal sleeve.

The conductive connection between the bolt- 7 and the inner coating 2 may be effected by means of an annular wire coil 23 carried by a screw or nut 24. In Fig. a resilient interrupted ring 25 is shown which may be substituted for the coil 23 to be pressed outwardly against the inner coating by means of radial springs 26 This ring is in good conductive connection with the cap 5 by means of a wire 27.

Such arrangements can naturally also be used in condensers which are constructed in one piece.

In Fig. 11, in which an integral condenser is shown (condenser portion and leadthrough portion in one piece) the contact between the inner coating 2 and the bolt 7 is effected by brush-like springs 33 which are pressed into contact by means of a sleeve 3st and a helical spring 35 hearing against a collar of the bolt 7. The bolt 7 is constructed in the form of a tube, and the springs are connected with this tube by a wire36 soldered at both ends. The tube 7 is also in good electrical connection with the upper cap 5. It is obvious that the conductive connection between the inner coating 2 and the tubular bolt 7 can also be eftectec by means of a wire 37 soldered at both ends, as is shown in Fig. 11a. In this case, in order to obtain a good soldering of the wire with the inner coatings 2, 16, the reinforcing layer 16 must be correspondingly thick, to a degree which is not necessary when contact springs 33 are used. The wire 37 may also be connected to the inner coating by galvanization instead of by soldering.

' Another two-part embodiment is shown in 13. Here the condenser portion a proper is, as it were, inserted in an eX- posed outer cover constituting the leadthrough part b. At the point of support the exposed outer cover is provided with a strongly ire-entrant concave portion 8 which ensures freedom from surface sparking on this exposed portion by reducing the field intensity. The space between the condenser portion a and the protective cover 7) is filled up to the level 14 with oil or paste 12.01 high specific breakdown strength. The two parts Z) and a are cemented together by a correspondingly shaped fitting such as a flanged disc member 38. The disc member may either be provided with a forked extension 6 as shown in Fig. 12,

by means of which the subsequent condenser of a series can be hung by means of a transverse bolt, or it may have a fiat bottom, as in Fig. 13, in order to be mounted on a surface. As shown in Fig. 12, an external annular rim 9 on the condenser portion a may be provided with a hollow channel or concave portion 15 to reduce the field intensity at the upper margin of the coating 1. The conductive connection with the outer coating of the condenser portion is effected by means of a metallic cover 39 placed on this portion which carries a bolt 7 attached to a flanged end plate inserted in the top opening of the part b. A spring 40 is inserted between this end plate and the cap 5 to ensure electric connection.

The embodiments of Figs. 12 and 13 afford the special advantage that the condenser portion which must be made with comparatively thin walls, as the capacity decreases with increasing wall thickness, is protected against damage in the interior of the exposed outer cover. This point is important, because the high tension condensers must be hung in the open on high tension masts and in part at very low levels, and consequently may constitute an easy target for stones, small shots and the like. Such damage is less to be feared in the protective sheath, as this may be made with stronger Walls, and is also protected by the sheds or petticoats.

In the construction of high tension condensers from ceramic materials or glass, such as heretofore described, attention has to be given to the fact that the different parts are quite differently stressed. Whereas the condenser vessel is primarily highly electrically stressed and thus must have a very high breakdown strength and a very high dielectric constant, the strains on the exterior leadthrough part are primarily of a mechanical and thermal nature.

The present invention takes account of this circumstance, in that the choice of materials for the preparation of the condenser vessel on the one hand and the outer covering on the other, is made in correspondence with "these stresses; thus the material for the manutacture of the condenser part, in consequence of the'choice of the substances or mixtures used in its preparation, has a very high electrical breakdown strength and a high dielectric constant, and the material out of which the lead-through part is made has a mechanical and thermal resistance as high as possible.

In consequence, we prefer for the preparation of the condenser part porcelain which is so composed and treated in a manner wellknown to any expert in the art that it has the requisite high breakdown strength and through portion, 3

. from which the condenser vessel is made has a high dielectric constant, this has the special advantage that the dimensions of the condenser for a given capacity may be kept small. 4

In order to relieve the electrically stressed lead-through part, it is' desirable to fill its interior space with an insulating material instead of with air. This, however, is not readily possible with constructions such as shown in Figs. 3 and 4 because the leadthrough part is disposed above the condenser part and thus the condenser part would also have to be filled if it is desired to fill the leadthrough part. As the filling is expensive, however, this would unnecessarily increase the production cost.

This disadvantage may be avoided by interchanging the position of the two parts so that the lead-through part is arranged beneath the condenser part. In this manner the use of an insulating medium within the lead-through part is facilitated and-the occurrence of discharge longitudinally thereof is reduced to a minimum.

Various embodiments of such a design are shownin Figs. 14 to 17, Figs. 14 and 15 illustrating an integral construction of the condenser and'Figs..16 and 17 a multi-part construction with the parts in nested position similar to Fig. 12. Figs. 14 and 16' are for a suspended arrangement, Figs. 15 and 17 are intended to stand.

As in the embodiments heretofore described a is the condenser portion, b the leadthe petticoats or sheds on the lead-through portion, 7 the connecting wire, 11 the annular rib, 20 the member by means of which the lead-through and condenser parts are cemented together. The annular rib may extend down to the bottom fitting '5 as indicated at 9 in Fig. 16 and may be provided with ribs or sheds 43 (Figs. 16 and 17) for the purpose of increasing the -creepage discharge path.

The lower lead-through portion b of the condenser is filled with insulating material 12 up to the point 14, whereby the above-mentioned advantages are obtained.

In Figs. 14 and 16 the arrangement of the individual elements in their relative positions is effected by elements 4, 5 such as are generally used with chain insulators. A tight closure is readily efiected' at the cap 5 by means of a washer or packing disc 12. In F igs. 15 and 17 the relative positioning of the individual elements is effected as is general with open air supporting columns, i. e., the condenser part is embedded in a plate-like support 38 enabling it to stand on a fiat surface. In this case also a tight closure can be ensured by a packing disc 42 so that the lead-through portion may be filled complete- 1y with a nonsolid medium.

- The condenser part may be protected against external damage by means of a protective sleeve 21 as shown in Fig. 16. Preferably, this sleeve is attached to the fitting 5 on the one side and to the annular member 20 on the other side, whereby the condenser part will be relieved from tensional strain. In the embodiments according to Figs. 16 and '17 either the space 12a or 12 alone or both can be filled with an insulating medium.

The conductive connection of the element with the coatings can be effected as heretofore described, i. e. either by means of a pressure contact connection, Fig. 15, or by a soldered connection, Fig. 16.

- In .the two part embodiment according to- Figs. 16 and 17 the inner conductive coating can extend as far as the lower fitting, Fig. 16, or may only be taken as far as a thinning in the neck of the vessel, Fig. 17

In Fig. 18 we have illustrated an embodiment which incorporates most of the features of our invention as heretofore explained. Thus, the condenser comprises a hollow body composed of a thin-walled flask-shaped condenser part a and of a tubular lead-through part or bushing b which latter is formed with petti'coats 3 and is coaxially coordinated to the part a and, more particularly, surrounds the mouth or neck-portion thereof. The condenser part is provided with an internal and an external conductive coating each of which is connected to one of'the fittings 4: and 5 which are attached to opposite ends of the composite hollow body. Moreover, the external coating on the condenser part is electrically connected to a conductive coating 8 provided within a rounded gutter formed by the petticoat which is nearest to the bottom end of the flask-shaped condenser part.

In the embodiment illustrated in Fig. 18 a similar gutter is provided on the circumfertowards the lower end thereof and constitutes a conical neck-portion of the flask-shaped part a.

The space between the wall of the tubular lead-through part b and this extension I which may or may not be equipped with peripheral ribs or petticoats 43, is filled with a suitable non-gaseous insulating filling and is sealed by a flanged sealing member which constitutes the fitting 5 and is in the form of a plate having two flanges one engaging the mouth of the condenser part a and the other one engaging the lower end oft-he leadthrough part b in a similar manner as shown in Figs. 12 and 13. From the fitting 5 a conductor 7 extends through the free space enclosed by the parts a and b and is provided with a resilient contact member or spring 33 which serves to ensure electrical connection between the inner coating and the fittingf).

In order to reduce-the field intensity near the rim of'the internal coating of the condenser part, the collar-shaped extension or neck-portion thereof is formed with an inner circumferential gutter 50 the inner face of which is covered bythe marginal Zone of the internal coating.

In this embodiment, the parts a and b are not integral with each other. For tl'. is reason, means must be provided to rigidly and tightly connect these parts. These means comprise a flanged metal ring 20 circumferentially cemented to the condenser part a and to the upper end of the lead-through part bin a similar manner as shown in Figs. 4 and 5. A protective metallic sleeve 21 is attached by means of the ring 20 to the lead-through part b to cover the upper portion of the condenser part a and to relieve it from mechanical stresses.

Leaf-springs 28 are provided to ensureelectrical contact with the sleeve 21 of the external coating on the condenser part a.

If we use the filling 12, we prefer to arrange the petticoats 3 in the manner shown in Figs. 12 and 14 to 18, i. e. inclined or turned down in the direction in which the mouth of the flask-shaped part a points to permit of installing the condenser in the position illustrated.

As heretofore mentioned, we prefer to use different materials for the parts a and b in Fig. 18, a silicic material having a very high dielectric coeflicient and high resistibility against electric puncture for the former, and a ceramic material significant by high resistibility against heat and mechanical stresses for the latter. Suitable compositions having, the requisite properties are well known to any expert in the manufacture of porcelain or glass for technical purposes.

What We claim is:

1. A high-tension electrical condenser comprising a. hollow body of silicic material composed of a thin-walled. flask-shaped condenser part and of a tubular lead-through part coaxially coordinated to the mouth of said condenser part and provided with exterior petticoats, anexternal and an internal conductive coating on said condenser part, fittings at tached to said hollow body and electrically connected each to one of said coatings, said condenser part having a collar-shaped extension arranged in proximity of the rim of said external coating and extending within the lead-through part towards the free end thereof, said internal coating covering the inner face ofsaid collar-shaped portion.-

2. The condenser claimed in claim 1 in which a conductive coating is provided within a gutter formed by the )etticoat nearest the bottom end of said flask-shaped condenser part and is electrically connected to said external coatin The condenser claimed in claim 1 in which an insulating filling is disposed within the space between said collar-shaped extension and the wall of said tubular lead-through portion.

4. A high-tension electrical condenser comprising a hollow body of silicic material composed of a thin-walled flask-shaped condenser part and of a tubular lead-through part coaxially coordinated to the mouth of said condenser part and provided with exterior petticoats, an external and an internal conductive coating on said condenser part, fittings attached to opposite ends of said hollow body and electrically connected each to one of said coatings, said flask-shaped condenser part having a conical neck portion provided with an outer annular collar forming a rounde gutter the inside of which is covered by the 'marginal Zone of said external coating.

5. A high-tension electrical condenser comprising a hollow body of silicic material co1nposed of a thin-walled flask-shaped condenser part and of a tubular leadt-hrough part coaxially coordinated to the mouth of said con denser part and. providedwith exterior petticoats, an external and an internal conductive coating on said condenser part, asealing member on the free end of said tubular leadthrough part, said condenser part having a collar-shaped extension arranged in PI'OXlllb ity of the rim of said external coating and ex tending within the lead-through part towards the free end thereof, said-internal coating covering the inner face of said collar shaped portion, and a conductor extending from said sealing member through said leadthrough part and said collar-shaped extension into said condenser part and electrically connected to said internal coating.

,6. A high-tension electrical condenser comprising a hollow body of silicic material coinposcd of a thin-walled flask-shaped condenser part and of a tubular lead-through part coax'ially coordinated to the mouth of said condenser part and provided with exterior petticoats, a sealing member on the free end of said lead-through part, said condenser part having a collar-shaped extension projecting Within said lead-through part towards the free end thereof and provided with peripheral ribs, an inner conductive coating on said condenser part and said collar-shaped exteni and to connect one end of said lead-through sion, an electrical connection between said coating and said sealing member, and an outer conductive coating on said condenser art.

7 A high-tension electrical condenser comprising a hollow body of silicic material composed of a thin-walled flask-shaped condenser part and of a tubular lead-through part coaxially coordinated to the mouth of said condenser part and provided with exterior petticoats, an external and an internal conductive coating on said condenser part, fittings attached to said hollow body and electrically connected each to one of said coatings, said condenser part having a collar-shaped extension arranged in proximity of the rim of said external coating and extending within the lead-through part towards the free end thereof and having an inner circumferential ridge at its uppermost end, said internal coating extending over the inner face of said collar-shaped portion and up to said ridge.

8. A high-tension electrical condenser comprising a thin-walled flask-shaped condenser part and a tubular lead-through part both of silicic material, the latter part being coaxially coordinated to and surrounding the mouth of said condenser part and provided with exterior petticoats, the condenser part extending at least partially into said leadthrough part, a flanged ring to rigidly and tightly connect said parts and to seal the gap defined by the outer periphery of the. condenser part and by the inner periphery of the lead-through part, a sealing member on the free end of said lead-through art, an inner conductive coating on said con enser part, an electrical connection between said coating and said sealing member, and an outer conductive coating on said condenser part.

9. A high-tension electrical condenser comprising a thin-walled flask-shaped condenser part, a' tubular lead-through part both of silicic material, the latter part being coaxially arranged on said condenser part and provided with exterior petticoats, means to seal part to said condenser part, a flanged sealing member engaging and closing the mouth of said condenser part and the free end of said lead-through part, an internal conductive coating on said condenser part electrical- 1y connected to said sealing member and an external conductive coating on said con- .denser part.

10. A high-tension electrical condenser rest of said condenser part, and conductive coatings on the inner and outer surface of vided with two flanges, one engaging the mouth of said condenser part and the other the free end of said lead-through part.

12. A high-tension electrical condenser comprising a hollow body of silicic material composed of a thin-walled flask-shaped con denser part and of a tubular lead-through part formed with exterior petticoats and arranged to cover the neck portion of said condenser part, terminal fittings on opposite ends of said body, conductive coatings on the inner and outer surface of said condenser part and resilient contact members arranged to ensure electric connection between said coatings and said' fittings.

13. A high-tension electrical condenser comprising a thin-Walled flask-shaped condenser part of a silicic material having a very and having a high resistibil-ity against heat I and mechanical stresses, said lead-through part being coaxially arranged on said condenser part and formed with exterior petti-' coats, the condenser part extending at least partially into said lead-through part, a flanged ring to rigidly and tightly connect said parts and to seal the ga defined by the outer periphery of the con enser part and by the inner periphery of the lead-through part, external and internal conductive coatings on said condenser part, and terminal fittings on both opposite ends of the composite body formed by said parts, each fitting being electrically connected to one of said coatings.

14. A high-tension electrical condenser com-. prising a lead-through bushing of silicic material provided with circumferential turneddown petticoats, a flask-shaped condenser part of silicic material arranged within said bushing with its neck portion downwardly directed, an insulating filling in the space between said bushing and said neck portion and conductive coatings on the inner and outer surface'of said condenser part. i

15. A high-tension electrical condenser comprising a lead-through bushing o'f silicic material provided with circumferential petticoats, a flask-shaped condenser part of silicic material arranged within said bushing, a sealing plate having two flanges one engaging the mouth of said flask-shaped condenser part and the other one engaging one end of said bushing, a metal piece to seal the other end of said bushing, an insulating filling in the space between said bushing and said con denser part, an internal and an external conductive coating on said condenserpart, said internal Coating being electrically connected to said plate and said external coating to said metal piece.

In testimony whereof we have aflixed our signatures.

WiLHELM REGERBIS. MARTIN HANDTRAG.

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