DE220947C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

- Λ * 220947- CLASS 21c. GROUP

ADOLF OCHS in FRANKFURT a. M.

be moved.

Patented in the German Empire on April 2, 1909.

The invention relates to a fuse for high-voltage lines that differ from distinguishes known backups based on similar principles by: that it is very simple in construction, works quite safely, easily tested and very light can be made operational again after the fuse wire has melted, as well as in every position, vertically, horizontally

ίο or at an angle.

The fuse consists essentially of two blocks lying in the same longitudinal axis Made of non-conductive materials, one of which can be rotated around its longitudinal axis. Both blocks are provided with a channel for the passage of the fuse wire, but so that the both channels do not coincide when the rotatable one is under the influence of a spring standing block of this is rotated into one end position. But they collapse when the rotatable block counteracts the action of its spring in the other end position is rotated, in which it is held by the wire inserted through both channels is, and from which it can only then be rotated again by the spring into the other end position can when the fusible wire clamped between the ends of the two channels has melted. Is it turned like this so its channel shifts with respect to the other, and both channels are both at their cooperating ends complete as well as in completely different longitudinal planes, therefore separated from each other in such a way that that after melting the wire an electric arc between the two ends of the line into which the wire is switched was, can't stand still. The fuse can simply be turned back rotatable block and inserting a new fuse wire made operational again will.

The fuse is shown in the drawing. Two insulating bodies b and c made of Stabilit or similar, smooth insulating material are accommodated in the tubular porcelain body a. The insulating piece b is cemented firmly into the tube, while the insulating piece c is rotatably mounted by means of the pins d and e. The end and bearing ring 0 is also made of a smooth insulating material and inserted into the tube and cemented. By the spring f, which is attached to the porcelain body at one end by the screw I (Fig. 2) and to the insulating piece c at the other end by the screw m (Fig. 3), this is rotated to one side. Two eccentric channels g and h are drilled through the insulating pieces b and c, the latter of which towards the center of the pin e

is directed. By means of a flag i attached to this, the insulating piece c can be turned from the outside against the action of the spring f and the mouths of the two channels, as shown in the drawing, can be opposed to each other at k. As a result of the rotation, the spring f is tensioned, the flag assuming the position η (FIG. 3). It is then possible to pass the melting body p, which can consist of silver, copper wire or the like, through the two channels. Once this has happened, the insulating piece c can no longer follow the course of the spring and can no longer turn back; it is prevented from this by the jamming melt body (Fig. 5).

For the purpose of good contact, the fusible element f is hard soldered into round cable lugs on both sides, which by means of the clamping pieces r

ao (see also Fig. 4) are clamped onto the actual contact blade s. The introduction of the fusible body into the channels can be done in such a way that first a steel band is pushed through it, which has a threaded pin at one end which is screwed into the threaded hole q (Fig. 4) located on the cable lug. By pulling the steel strip further, the melting body j> is then pulled through the channels and clamped on both sides. With some skill, however, the melting body can also be inserted by simply pushing it through.
The fuse is inserted into the contact springs in the usual way by means of the switching pliers.

The spring f can be adapted to the material of the melting body (silver, copper, etc.) in order to prevent the same from tearing too early.

In the event of a short circuit or an overload of the fuse, the melting body guided through the channels melts, namely at the point k first, as a result of which the insulating piece c becomes free and snaps around following the pull of the spring f. From Fig. 5 it can be seen that only a short displacement of a channel is required to bring about an immediate interruption. After this movement, the channels are no longer facing each other, and the path of any arc that may occur is blocked; he is extinguished. The process of melting actually takes place in three stages, namely softening, melting and gasification (electric arc). Even if this happens only in a fraction of a second, the fuse will work during the second stage, i.e. during melting, and interrupt the melting body. The dangerous arc and the stopping of it, with. always occurring overvoltages, will not occur at all. As a result, the fuse works almost noiselessly.

After the melting body has melted through, the flag i has shifted to point t (FIG. 3) and placed on the contact blade, whereby the movement of the spring is limited. From the outside you can immediately see which fuse has worked, which is important when eliminating faults in a cable network.

A main advantage of the fuse is that in the event of a short circuit only the melting body is destroyed and all other parts remain completely intact. The backup can So after the remnants of the old fuse wire have been removed and a new fuse wire is withdrawn, be used again immediately.

Another advantage of the fuse is that there is no stagnant arc from the Short-circuit affected contact springs, contact blades, termination boxes and busbars destroy and damage neighboring cable parts.

The check whether a fuse is still undamaged is done by moving the isolated flag i back and forth on the fuse in the company (using a rubber glove). This short movement of the spring is possible because the melting body does not completely fill the channels (FIG. 5).

Since, as I said, only a short movement of the insulating piece c is required to obtain a safe working of the fuse, no reservations can be raised against the use of a spring, since such a spring, even if it is constantly tensioned for years and thus on her Should lose spring force, you can still definitely make a short movement.

The fuse is repeated in practical operation at currents up to 200 amps. and 3000 volts have been tested, whereby they are always safe under immediate short circuit Work has proven its usefulness.

Claims (1)

Patent claim: High-voltage fuse for all voltages and currents, in which the channels produced for the melting body are shifted against each other when it melts, characterized in that two insulating pieces (b and c) arranged in an insulating sleeve (a ), one of which (c) against the other ( b) rotating bar, each have an eccentric bore (g and h) for receiving the melting body (p) , which bores are held together by the melting body against the action of a spring (f) , but after the melting of the melting body (p) under the Effect of the same spring (f) are twisted against each other in such a way that their connection is canceled and the formation of an arc is made impossible. For this purpose ι sheet of drawings.