DE1804113C3 - Double bushing with capacitor linings - Google Patents

Description

- - - tentschrift903 230).

controls in a known manner both in the radial and in the axial direction and from one Variety in length graduated capacitor plates (9) is completely penetrated.

2. capacitor bushing according to claim 1, characterized in that it is known per se Way is arranged in a porcelain insulator, which is covered with a liquid insulating agent is filled.

3. condenser bushing according to claim 1 or 2, characterized in that it is in on known way from soaked with a castable and curable plastic fibrous Insulating material is wrapped.

The invention relates to a double bushing provided with capacitor coatings, in the case of the inner and Outer lead-through are arranged coaxially and «ine common conductive, tubular cylinder-shaped Now, in high voltage technology, diversions with different potentials often have to be equal.

»O are detected in time, for example when two Transformers, in particular converters, are to be connected, each winding at high voltage potential and the other have ground or low voltage potential. One has to be in this

«5 cases helped that you have two adjacent Feedthroughs used in an oil-filled cylindrical porcelain nozzle, the one is wrapped bottom up and the other top down. It makes sense that with this solution entails considerable additional expenditure in terms of space requirements and manufacturing costs is. These two side by side opposite feedthroughs require in one Diameter of the cylindrical interior of the porcelain cover a relatively large space, so that large unused on both sides of the bushings in the transverse diameter direction Gussets remain free, which are normally filled with devices that are filled with insulating oil.

«A common conductive, tubular cylinder-shaped

Layer and have the full potential in radial ♦ <> The total oil volume will be much larger,

i Hiblik f di id Sihhif

Direction is to be traversed inwards and outwards.

Such bushings are well known in high voltage technology. They serve for example the diversion of high-voltage windings from the tank of transformers to the Mains or to the generator, with the boiler at ground potential. Located in such implementations the winding exit on high voltage potential inside the bushing and that High-voltage potential becomes the boiler cover with concentrically wound, with conductive Coverings provided and above and below the boiler cover conically tapered layers of insulation reduced.

In order to counteract the difficulties associated with the large dimensions in the provision of insulating material and in production with capacitor bushings for very high voltages, this is highly undesirable in view of the increasing safety requirements for preventing fires in electrical systems (German patent specification 903 230).
In addition, the longitudinal control of the potential of the entire double lead-through arrangement is worsened or made more difficult, so that there is at least a greater safety risk against internal faults.

So there is the task, the necessary oil volume for security reasons to a minimum, to increase the reliability and the Reduce the dimensions of these devices.

These tasks are achieved according to the invention in a double bushing provided with capacitor coatings solved in that the internal leadthrough has the full potential difference in the radial direction a large number of telescopically staggered and / or graded in length arranged only in the end regions Capacitor deposits controls and that the

already known that the ^{bushing is} repeatedly under- 6o outside bushing the full potential difference in

share, manufacture the parts individually and just plug them together during assembly. With the well-known split condenser bushing, for example, the inner part consists of a beveled one on both sides Middle part, in which the possibly existing linings are arranged radially stepped, and from two axially adjoining edge parts, which are formed with an inner cone, which on controls in a manner known per se both in the radial and in the axial direction and from a large number Completely interspersed in the length of stepped capacitor layers int.

⁶ S It is true that a rectifier arrangement with interconnected hot cathode valves and capacitors for X-ray purposes is known, in which the

fonnator generated high voltage by means of a capacitance the electrodes of the X-ray tube, which are in the form of coaxial coatings in the out the transformer vessel leading out implementation is formed. Inside the implementation is the second connection of the heating isolating transformer out, the first connection being made via the mcjren capacitor plate. In a certain Circuit arrangement of several valves can in the blocking phase of a valve the full Potential difference between the outer and inner layers of the two forming the capacitor Deposits are pending so that the implementation for double the potential difference on both sides of the outer capacitor coating must be designed.

The task and the mode of operation of this arrangement, however, is this outer conductor not carried out over the length of the implementation, it has a connection for the only on one side High voltage transformer (DT-PS 5 88 575).

In advantageous embodiments of the invention, the implementation is either in a manner known per se arranged in a porcelain insulator which is filled with a liquid insulating agent, or made of a fibrous insulating material impregnated with a pourable and curable plastic. The invention is explained in more detail using the embodiment according to the figure:

In it are with 1 the inner, with 2 the outer lead-through designated. The outer lead-through 2 is arranged concentrically around the inner lead-through 1, and between the two is the conductive layer 3. This conductive layer 3 can both by a conductive covering in the usual way as well as by a metal foil wrap, a copper pipe or the like. Be formed. Inner and outer penetrations each form functional partial penetrations, each controlling the full potential difference. The inner bushing 1 is essentially cylindrical formed paper roll, in which only the upper and lower ends 6 and 7 are conical with control length for oil are pointed. Depending on the type of construction to be connected to each other active parts, the taper of the bushing ends can also be shown in the form indicated by dashed lines be elected internally. In the example shown, only the upper ones are in the internal bushing 1 and lower areas provided with, for example, telescopically offset control inserts 8, the Any length can be selected, since the field distribution in the remaining area of the internal bushing 1 is self-sufficient controls. The outer leadthrough 2, on the other hand, is completely provided with control inserts 9; her upper one Sende 10 is conically tapered with control length for air and its lower end 11 for oil The support insulator that closes off the capacitor bushing to the outside is symbolic here only through the shell 12 shown, which is closely matched to the shape of the implementation and clearly shows that no large gusset spaces just filled with insulating oil

ίο can arise.

The mode of operation of the implementation is now as follows:

In the inside guide 1, the potential P ₁ to the potential P ₂ is substantially radially towards gesteu-

> 5, if you disregard the conical ends 6 and 7, where there is also an axial control via the same potential difference (under oil). _{The external bushing 2} becomes POtBnUaIP ₁ in the radial direction starting from the potential P 2

»Ο controlled, likewise in the axial direction the same potential difference in the upper area at the conical end 10 for air and in the lower area at 11 again for oil. If one now sets P ₁ for earth potential and P ₂ for high voltage potential, then it can be seen

that the total potential difference is diverted twice in the radial direction and four times in the axial direction. For the functionality of the capacitor bushing, it does not matter whether P _{1 is} ground potential or P ₂ .

In the implementation described, you can now optionally lead to earth potential in the inner axis the condenser bushing and the high-voltage output the conductive layer or, conversely, the high-voltage discharge takes place in its interior while the conduction to earth potential is carried out on the conductive layer. For the latter case the bushing shown in the figure is to be provided in the reverse order.

The application of the invention allows considerable space savings, so that only one instead two feedthroughs are required and the empty gusset spaces that arise, for example, are omitted when two bushings are arranged next to each other in a porcelain insulator. With usual Filling these interstices with insulating oil is practically unnecessary and only increases the risk of fire oil volume available in the device. Furthermore, considerable manufacturing savings result from the fact that now only one implementation needs to be wrapped.

1 sheet of drawings

Claims (1)

Claims: the bevel of the middle part fits, and the groove is provided inwardly towards the axial center telescopically offset capacitor plates. On the outside, this condenser bushing part, which reduces about half the potential difference, is encompassed by a fourth bushing part designed for the other part of the potential difference, which covers the joints of the assembled inner part and in which the telescopically offset coverings and, if necessary, the radial central coverings continue to the outside of the mounting point . This at least complex subdivision of the condenser bushing has been made for manufacturing reasons 1. Double bushing provided with capacitor linings, are arranged coaxially in the inner and outer leadthroughs and a common one Have a conductive, tubular cylindrical layer and have the full potential in the radial direction is traversed inwards and outwards, characterized in that the Internal bushing (1) the full potential difference in the radial direction with a multitude only in the end areas arranged, telescopically offset and / or lengthwise graduated capacitor plates (8) controls and that the outer 15 condenser bushing builds here from the inside implementation (2) the full potential difference in to the outside the potential only once (German pa-