DE1060014B - Outdoor switch-disconnector - Google Patents

Description

There are outdoor switch disconnectors known whose isolating contacts consist of two in close parallel juxtaposed Plains against each other movable horn-like hills exist and with which the contact comes about by lateral contact with the horns. Such switches allow that opening and closing of energized conduction paths, as when the horns are removed from each other the arc that occurs when the circuit is interrupted along the horns is led above and brought to extinction. However, these horn switches are for a permanent load Not suitable with larger currents because their horns are only in relatively small areas touch each other. Horn switches are therefore often used in conjunction with disconnectors in such a way that one of the two horns belonging to a horn switch is attached to the fixed switch contact and is attached to the free end of the movable contact of the circuit breaker. With such a In combination, the isolating switch takes over the permanent current load, while the horn switch serves for the immediate separation and closing of the line path. Prerequisite for such Switching under load is that the arrangement of the two switches to one another is such that the Horn switch only interrupts the current path when the contact parts of the disconnector are already there are disengaged.

Another disadvantage of the horn switch is that when it is set up outdoors, it is damp Weather and frost are difficult and often impossible to operate because the horns are on their crossing points are more or less firmly connected to each other by ice formation. Try, Forcibly separating iced horn switches can easily lead to permanent deformations of the horns, the question the further function of the switch. A horn switch limits the usability a disconnector combined with it, installed outdoors, even if this is the result of its robust design can be switched by applying greater force or when its contacts by their closed shape, by protective hoods or the like against the precipitation of moisture are protected.

The aim of the invention is to provide horn switches also in connection with and outdoors disconnectors exposed to moisture and frost, in particular knife disconnectors, to make usable. It is based on the idea that one is parallel to a circuit breaker lying horn switch only needs to create a current bridge if the contacts of the

Applicant:

Fritz Driescher
Special factory for power station requirements, Rheydt (Rhld.)

Disconnector can be disconnected or closed, but not while the disconnector is conducting power has taken over, so it is completely switched on.

When attempting to shape the horns of the horn switch so that they are fully on when the circuit breaker do not touch each other, but contact each other as long as the disconnector is opened until the disconnector is open, a type for a horn switch has been found, in the case of the full maintenance of the functions inherent to the horn switches, a mechanical one Connection of the horns through ice formation cannot occur and which at the same time has other advantages over has the usual horn switches.

This shows an outdoor switch-disconnector with a one-piece pivotable contact blade containing isolating switch and a switch that turns the current on and off with hook-shaped curved horns that double overlap when switched on according to the invention in that one of the horns is designed as a loop such that it is completely switched on disconnector the other, designed as a simple bracket horn on its lower and the upper end with each bucket extension at a distance, one near the foot and the other the other is near the apex of the loop and the rest of the leg, i.e. H. between these extensions are so close together that they are intimate during the opening and closing of the circuit breaker Contact with the bow-shaped horn passing between them under frictional engagement devices.

The extensions of the loop can easily be made so that they are the other horn in one Surrounding distance that makes a mechanical connection of the horns impossible by freezing.

909 558/346

Claims (1)

The embodiment of a horn switch described here also proves to be useful regardless of any risk of icing, because when the switch is switched off, the horn contacts are initially not in contact with each other and therefore no additional force is required when initiating the switching process to overcome static friction between the horns. Since the horns in this case are already in relative movement when they touch one another, overcoming the sliding friction that subsequently occurs does not require any significant additional effort. Because one horn encompasses the other on both sides, no torsional forces are exerted on the horns when the horn is switched, and in the switched-on position all parts of the horn which are subjected to elastic deformation during switching are relaxed. A high-voltage disconnector is known per se with an auxiliary switch lying parallel to its main contacts, in which the contacts of the auxiliary switch do not make conductive contact when the main switch is switched on. There, however, sit the auxiliary contacts on long, resilient arms, which are elastically deformed during the shutdown process by the interlocking auxiliary contacts and suddenly and quickly separate the auxiliary contacts from one another by means of their restoring force towards the end of the shutdown path. Apart from the fact that this switch is not intended to prevent the spring arms carrying the auxiliary contacts from icing up and also does not appear suitable because of the relatively large areas opposite spring arms, it is also not a horn switch which the arc created at the moment of switching off slides upwards on the horns moving upwards under the effect of the heat buoyancy until it finally breaks off. The known auxiliary switch is complicated in construction, expensive to manufacture and less resistant to mechanical stress in comparison with horn switches. With the same effect, a horn switch of the type described can also be used in connection with so-called sliding disconnectors, provided that these are arranged so that their sliding contacts are moved in a horizontal or approximately horizontal direction. In the drawing, an exemplary embodiment of the outdoor switch-disconnector forming the subject of the invention is shown schematically, namely, FIG. 1 shows a switch of the type described in a side view, FIG. 2 shows the connection of a horn switch with the contact parts of a conventional knife disconnector, FIG. 3 a section through the horn switch according to Fig. 2 in the course of the line A-B1 Fig. 4 the tip of a line pole with switch disconnectors of the type described here arranged on opposite sides of the pole in a side view. The switch disconnector consisting of the horns 1 and 2 is connected to a knife disconnector 3 in such a way that the horn 2 is conductively attached to the fixed spring contact 4 above, while the horn 1 is arranged at the free end of the knife 5 pivoted in the lower spring contact 6. For this purpose, the knife 5 is extended beyond the fixed contact 4 at its free end. In the execution contact according to Fig. 2, the knife 7 has only the usual length for disconnectors. B. is held on the knife 7 by screw terminals 9. The fastening of the horn 2 'corresponds to that of the horn 2 on the switch according to FIG. 1. FIG. 3 shows a view of the horn switch according to FIG. 2 against the section plane Α-B. The horn 2 'is designed here as a loop, the legs of which are further apart at the foot and at the apex of the loop than in its central part. The extensions of the loop are dimensioned so that when the switch is completely switched on, the horn 1 'passes through the loop within these extensions. In addition, the legs 10 and 11 of the loop are so close to one another that the horn 1 'can only be moved through between them with intimate contact. The position a shows the horn 1 'with the switch closed, the points b, c, d represent phases of movement of the upper part of the horn 1' during the switching process. The separation takes place near the position d. Fig. 4 shows the way in which the switch of the type described here can be attached to the top of conventional masts. While horn switches were previously housed only lying on the top of the mast, the available space was already fully occupied by a single three-pole switch, the switch forming the subject of the invention allows it to be arranged on the side walls of the mast. Up to four three-pole switches can easily be accommodated on a single mast, so that each branch can be switched separately even at cable branches. Patent claims: 1. Outdoor switch-disconnector with a one-piece pivotable contact blade containing Isolating switch and a horn switch that causes the current to be switched on and off hook-shaped curved horns that double overlap in the on position characterized in that one of the horns of the horn switch is designed as a loop such that it When the disconnector is fully switched on, the other horn, which is designed as a simple bracket, is also included near her foot and crown located extensions at a distance surrounds the thighs the loop are so close to each other that they are during the opening and closing of the Disconnector are in contact with the bow-shaped horn. 2. outdoor switch disconnector according to claim 1, characterized in that the horns of the hearing ~ nerschalters are at a distance from each other when the knife switch is closed, which is a mechanical Connection of the horns by icing practically excludes. Considered publications:
German patents No. 114 061, 115 082, 260 949, 314 553, 379 117, 458 439;
U.S. Patent Nos. 1928,635, 1,923,312, 1919 065. For this purpose, 1 sheet of drawings © 909 558/346 6.59