DE1009265B - Rod-shaped ceramic actuation insulator for multi-pole disconnectors - Google Patents

Description

Actuating isolators for circuit breakers generally consist of cylindrical or rod-shaped Ceramic insulators or other suitable insulating materials. At their ends they are with provided metallic caps for receiving the articulated connections, with the rest of the pivot pins also let in directly or with the help of fittings in transverse passages of the isolator could be.

The type and shape of the actuating isolators and their type of reinforcement are now with regard to the minimum distance to be observed of essential Influence on the height of the disconnector and so small in order to maintain low switchgear as possible to keep.

Small pole heights of the disconnector are z. B. achieved by using insulating rods, in where the bolts for the live pivot point of the cutting knife and for the earthed Shift crank either directly in bores or in bush-shaped inserted into the bores Fittings are stored. Actuating rods made of hard paper do not live in damp switchgear. Actuating rods made from thermoplastics are flammable or tend to warp elevated temperature. Other plastics also have more or less major disadvantages. Isolators Because of their brittleness, made of ceramic materials have the disadvantage that even small Tolerances of the individual parts or during assembly lead to tension and tilting, whereby the bolt bearings break out and a guarantee for the feasibility of the Switching action no longer! »Is displayed. This disadvantage occurs particularly with rod-shaped ceramic actuating insulators of the type mentioned above. There but disconnectors in high-voltage systems with their visible air separation distances of safety of the operating personnel, the reliability of the operating isolators is of particular importance to.

The object of the invention now relates to a rod-shaped ceramic actuation insulator for multi-pole disconnectors, in which due to its special connection with the adjoining device parts and through a special arrangement of transverse grooves on its narrow sides, the aforementioned Disadvantages do not occur. The cross-sectional shape of the insulator is approximately rectangular.

The individual parts of the isolator according to the invention can be found in the exemplary embodiments shown in the drawing. Here shows Figure 1 is the front view of one end of an insulator, Figure 2 is the side view of one end of an insulator, Rod-shaped! · Ceramic

Actuating isolator for multi-pole

Disconnector

Applicant:

Concordia Maschinen- u. Elektrizitätsgesellschaft m.b.H.,

Stuttgart 13, Talstrasse 41

Erwin Cabinet, Stuttgart-Sillenbuch,
has been named as the inventor

Figure 3 is a front view of a modified design of one end of an insulator,

Fig. 4 the side view of the end according to Fig. 3,
Fig. 5 the front view of an entire isolator,
Figure 6 shows the side view of the isolator according to Figure 5, partly in section.

In the embodiment according to Figures 1 and 2, only one end is drawn because of the similarity of the insulator ends. At each end, metal disks 2 are placed on both sides, which contain bearing holes 3 for the joint connection and are fastened to the insulator 1 with the desired distance L by means of an adhesive or cement layer 4, regardless of the length tolerances that arise during firing of ceramic materials. The diameter d of the metal disc 2 is expediently no larger than the eye diameter of adjacent cranks or the width of adjacent separating knives, which is why, in terms of insulation, complete utilization of the isolator length and thus the smallest dimensions of the device pole heights are made possible. The binding layer 4 gives the armored actuating insulator 1 a certain elasticity, which has a favorable effect on the strength of the ceramic material. The insulator 1 is prevented from peeling off and flaking off by mounting the articulated connection in metal (holes 3 in the disks 2). The execution is very simple and cheap to produce.

In order to avoid that, in the event of excessive stress on the binding layer 4 due to impact,

5 »Moisture or warmth a loosening or detachment of the metal disks 2 from the insulator 1 are in the exemplary embodiment according to Figure 3 and 4 on the insulator 1 increased pressed-on cams or lugs 5 are provided which allow radial movement

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the metal disks 2 do not allow. In order to be independent of dimensional tolerances when placing the Disks 2 by means of the binding layer 4 to be able to set the desired pivot point distance L precisely the discs 2 sit eccentrically in this case. the holes 3 provided.

The example in Fig. 5 and 6 shows a full. Permanent ceramic actuation isolator in rod form according to the invention, which has only one raised cam 7 per bearing point, which from the edges of the Metal disc 6 is overlapped. This training does not affect the function of the isolator 1, when the binding layer 4 is loosened or destroyed. A radial shifting of the disks 6 is prevented by the cams 7, especially since the discs 6 by the adjacent cranks 9 and Separating knife 10 can not move laterally. The metal disks 6, which are provided with raised edges contain eccentrically seated bores 3, the distance L of the pivot pin 8 to the desired To be able to determine the measure.

In order to keep internal stresses caused by the burning as low as possible in such a rod-shaped insulator, it is not only provided with grooves 11 or ribs 12 in the usual way to increase the creepage distance in damp or dirt-free systems, but these grooves or ribs are preferably arranged on the narrow sides of the insulator against its ends. Since this results in a total width B corresponding to the diameter D of the ends of the insulator 1, the burning can be carried out on edge. Bending of the insulator is avoided, which is particularly useful for the creation of as little or no internal stress as possible and prevents the ends of the insulator 1 from flaking off. The grooves 11 or the ribs 12 can easily be made by appropriately shaping the punching tool - punching takes place in the direction of arrows 5. Of course, the grooves 11 or ribs 12 can also be attached to the broad sides of the insulator 1 if necessary.

After a glaze has been applied, the above-described measure with regard to the shaping and making the ends of the insulator and the applied disks an actuator insulator received that meets all practical requirements, especially with regard to its mechanical and electrical Strength corresponds. Its purpose also extends to load or power disconnectors and other electrical switchgear.

Claims (5)

Patent claims: 1. Rod-shaped * ceramic actuating isolator for multi-pole disconnectors, characterized in that metal disks (2, 6) are glued or cemented on both sides at its ends by means of a binding layer (4) which are provided with bores (3) for the articulated connection. 2. Isolator according to claim 1, characterized in that it has raised cams (5, 7) which prevent or limit radial movement of the metal disks {2, 6). 3. Insulator according to claim 1 and 2, characterized in that the binding layer (4) between the insulator (1) and the metal disks (2, 6) consists of shock-absorbing or elastic adhesives or putties. 4. Isolator according to claim 1 to 3, characterized in that the metal discs (2, 6) with eccentrically arranged bores (3) are provided. 5. Insulator according to claim 1 to 4, which is provided with grooves or ribs that extend the creepage path is, characterized in that these grooves (11) or ribs (12) especially at the ends of the insulator (1) are attached so that the total width of the same is the diameter of its Ends. Considered publications: German patent specifications No. 746 525, 474 374, 447, 651 519. 1 sheet of drawings © 709 54SÖ3O 5.57