DE1092084B - Leakage current protection device - Google Patents

Description

GERMAN

KL. 21c 15/03

INTERNATIONAL KL.

PATENT OFFICE H02g; BOId

C 18312 VIIId / 21c

REGISTRATION DATE: JANUARY 30, 1959 NOTICE

AND ISSUE OF THE
EDITORIAL:

The invention relates to a protective device for rods, in particular made of plastic or tubular insulating bodies which are under high electrical voltage and in which the The formation of leakage current on the surface of the insulating body is to be prevented.

The risk of leakage current formation along the surface is particularly high when the voltage is high standing knocking devices for electrical dust or gas cleaning systems available.

The knocking device moved during electrostatic dedusting is converted into electrical dust and ' or gas cleaning systems driven by an electric motor, the shaft of which is the knocking device emotional.

This knocking device is under a high electrical voltage, which is why it is necessary insert an intermediate part between this knocking device and the motor shaft, which controls the electric motor isolated from the live knocking device and at the same time the high mechanical Able to withstand stress.

Preferably, this intermediate part consists of an insulating material, for. B. plastic, preferably paper mache - plastic, existing pipe of, for example, 50 cm in length, 5 to 7 cm Diameter and a clear width of a few cm. This intermediate part can be made of Pertinax, for example exist.

Due to the humidity of the operating atmosphere, the existing dust and any Gaseous acid vapors form on the insulating intermediate part after a short period of operation Current paths that very soon lead to arcing or arcing and thus burning Lead plastic pipe, so that this intermediate part is unusable.

In order to avoid such damage, it has already been proposed to replace the plastic pipe Use porcelain insulators. However, these have proven in practice because of their low mechanical Strength, especially the low breaking strength, and their very high manufacturing costs not proven, so that one has refrained from using them.

Protective devices for rod-shaped or tubular-shaped elements under high voltage are known Insulating body to prevent the formation of leakage current on the surface of the insulating body, the consist in that at one or both ends of the insulating body shield-like or disk-like, perpendicular Protective disks made of insulating material, preferably plastic, standing on the axis of the insulating body, are provided which is the leakage current path length of the leakage current protection device

Applicant:

Stir-sulfuric acid

G-eaelischaft with limited liability, Bochum

Dr. Peter Robl, Goldach, St. Gallen (Sweat:
has been named as the inventor

Enlarge insulating body and their diameter compared to the insulating body diameter significantly is bigger.

However, such devices only incompletely solve the task, as they reduce the leakage currents, which may develop, do not keep away from the insulating body and therefore remain on the surface of the same can form the current paths, which ultimately lead to the destruction of the mechanically highly stressed insulator lead.

The object of the invention is now to improve such protective devices.

This happens because according to the invention on Edge of the protective disks around the insulating body a number of thin, preferably easily replaceable Isolierstoffstäben, preferably plastic rods, is provided from the one end of the insulating body run to the other end of the insulating body and make their way through the leakage currents that occur from one efide of the insulator to the other can take. The current paths are therefore laid from the insulating body to the plastic rods and at the same time also a division into a number of current paths, so that also the Leakage current is divided into a number of partial currents that are connected in parallel. The low strength the partial currents do not lead to spark formation.

With a protective device of this type, the formation of leakage currents on the rod-shaped or tubular insulating body itself and prevents the destruction of this body.

FIGS. 1 to 4 illustrate exemplary embodiments of the invention.

The protective disks 2 are attached to the insulating body 1 (coupling shaft) and are attached to the periphery Have prism-shaped teeth 2. Thin plastic rods 4 connect the two protective panes 2 together.

009 569/319

092

At the joints of the protective panels 2 with the Insulating body 1 are beads 5 to increase the dielectric, sharpness, e.g. B. made of shellac or adhesive synthetic resins, provided. The insulator 1 is provided with an iron coupling 6 to the engine.

A jacket 7 made of insulating film creates a covering of the protective disks 2 and the insulating rods 4 formed basket.

At the periphery of the protective disks 2 are pyramidal trained prongs 8 are provided.

According to a preferred embodiment, the disks are on. their periphery tooth-shaped or serrated designed in such a way that prism-shaped or pyramid-shaped teeth 3 or prongs 8 arise.

Tip discharges can occur through these teeth or prongs.

The fastening of the insulating rods 4 is done just below the prongs and preferably through Pinching and / or sticking in the indentations.

The teeth or prongs can be used in a manner known per se, for. B. be coated with shellac, and the The cross section of the insulating rods can be round, square or rectangular, etc. It can be paper mache plastic rods from Z. B. 4 to 12 mm diameter or edge length can be used, the number of rods, for example, in the Can move on the order of 4 to 32.

The protective disks 2 have a diameter of 20 to 30 cm, for example, and are preferred cut from plastic sheets. In the middle of the discs, for example, a thickness of 12 mm can have, a hole corresponding to the diameter of the insulating body 1 is cut, then the discs are wedged on the insulating body 1 in such a way that a certain distance between the iron coupling parts 6 at the ends of the insulating body 1 and the outer sides of the protective disks 2 is created. The wedged-on protective disks are made by cementing the joints several times on the insulating body with thickened shellac or other insulating resins, lacquers or hardened or curable plastic resins, dielectrically sealed and bonded pore-free.

The circular bead, e.g. B. made of shellac or curable or hardened synthetic resin, between the Plastic pipe on both sides of the panes increases the dielectric tightness.

Because the outer insulating rods are the plastic insulator tube fully protect against burning through arcing and leakage currents Spray on the prongs or take their way over the thin plastic rods, so that l> ei a possible arcing only these, which can easily be exchanged and renewed on the spot and also not in terms of price weight, burn.

It is also advantageous between the wedged onto the insulating body 1, in this case preferably non-serrated, equipped with plastic rods 4 protective disks 2 one outside of this Provide rods lying jacket 7 made of insulating film airtight.

The thus designed equipment part then has a trom- ⁶ S melähnliches appearance and protects the insulating body and the plastic rods before any harmful external influences.

The insulating body 1 is protected against significant wear by the protective device. The provision of the protective disks with the insulating rods prevents the occurrence of leakage currents dangerous size and the occurrence of arcing, especially the insulating body itself, e.g. B. the plastic pipe itself, secured against arcing, because the aforementioned Arrangement acts like a protective cage.

The operational safety of an electrical development chamber is ensured by the protective device the invention greatly enlarged and increased the economy of the system.

Claims (5)

Patent claims: 1. Protection device for high voltage, rod-shaped or tubular Insulating body to prevent the formation of leakage current on the surface of the insulating body, the shield-like or disk-like at one or both ends, perpendicular to the axis of the insulator standing protective disks made of insulating material, preferably made of plastic, has the Increase the leakage current path length of the insulator and its diameter compared to the Insulating body diameter is much larger, in particular for designed as an insulating body Intermediate parts between the drive motor and knocking device in the case of electrical dust or Gas cleaning systems, characterized in that on the edge of the protective panes (2) around the insulating body (1) A number of thin, preferably easily replaceable insulating rods (4), preferably Plastic rods, is provided, which extend from one end of the insulating body to the other end of the insulating body run and the leakage currents that occur make their way from one end of the insulating body to the other can take. 2. Protection device according to claim 1, characterized in that the protective discs (2) to the Joints with the insulating body (1) thereby sealed and connected dielectrically without pores are that beads (5) made of insulating material, e.g. B. shellac or curable plastic resins, are provided, on both sides of the protective discs (2) at the joint with the insulating body (4). 3. Protection device according to claims 1 and 2, characterized in that outside the Insulating rods (4) between the two protective disks (2) a jacket (7) made of insulating film is provided. 4. Protection device according to claims 1, 2 or 3, characterized in that on the periphery the protective disks are provided with prism-shaped or pyramid-shaped prongs or teeth (3, 8) are, the cut and / or machining surfaces, if necessary by an insulating Paint, resin or plastic layer are smoothed. 5. Protection device according to claim 4, characterized in that the insulating rods (4) in the Zig-zag depressions are clamped and / or glued therein. Considered publications:
German patent specifications No. 900 233, 444 182,
775; Swiss patent specification No. 224 047,207 468. 1 sheet of drawings © 009 569/319 7.60