DE2919102C2 - Discharge switch in a transmitter system for rapid dissipation of energy in the event of a short circuit in a transmitter tube - Google Patents

Description

b) a spring relaxed in the closed switching position,

c) a holding bracket that is rigidly connected to the switch plunger (2) and is suitable as a magnetic yoke

d) a holding magnet (8 or% ) arranged in the area of the holding bracket (11) in the open switchgear.

e) a pull magnet (6), the armature of which carries a bolt (3) which is inserted into an elongated hole in the switch plunger (2) intervenes,

f) the dropped armature (5) is with the switch plunger in the closed switch position (2) coupled on train,

g) When the switch plunger (2) is in the open switch position, the elongated hole enables the Anchor (5).

2. Discharge switch according to claim 1, characterized by that the holding magnet circuit has two holding magnets arranged symmetrically to the switch plunger (2) (9,10) contains.

3. Discharge switch according to claim 1 or 2, characterized in that the Haltebügcl (11) the side facing the holding magnets (9, 10) has a non-magnetic separating plate (12).

The invention relates to a discharge switch in one Transmitter system for quick reporting in the event of a short circuit in a transmitter tube.

Such an Entladeschaltcr is known from DE-AS 10 33 799. However, this is the case Switch around an open spark gap.

In addition, CH-PS 3 85 337 describes a short circuiter for bridging electrical arcs Medium or high voltage systems known. There are several fixed Koritakt pieces in this short-circuiter and at least one movable contact piece arranged within a container in a medium which has a higher dielectric strength than air at atmospheric pressure.

Furthermore, from US-PS 17 49 566 an aid for turning on a switch with an electrical operated holding magnetic circuit known. However, such relays have the disadvantage of a considerable time delay.

In transmission systems, in the event of a short circuit in the power tube, the voltage in the high-voltage transformer, Rectifier and electrical energy present in the filter elements to protect the power tube a very fast switching discharge switch with no resistance be discharged. This can be done by igniting an arc in an open spark gap or with a mercury vapor interrupter (ignitron) gcschc hen. Heide have / was the advantage of very fast switching. However, the open spark gap has the disadvantage that it has to be constantly serviced because of possible contamination and, overall, an unsafe one Switching behavior shows. The mercury vapor sound tubes requires a complex control and is also because of the large size and the required Costs can only be justified with very high transmission powers.

The present invention is based on the object To create a fast discharge switch that works reliably without high manufacturing and operating costs.

A switch closure should be guaranteed after a maximum of 15 msec after a trigger signal is present. To the This object is achieved according to the invention for a discharge switch of the type mentioned in the introduction Features suggested:

a) a vacuum interrupter 1 has an externally driven switching impact! 2 connected.

b) a spring relaxed in a closed sound enclosure,

c) a rigidly connected to the shift plunger than 2 -, magnetic hole suitable retaining bracket 11,

d) a holding magnet (8 or 9) arranged in the area of the holding bracket 11 in the open switch position,

e) a pull magnet 6, the armature of which carries a bolt jo 3, which is inserted into an elongated hole in the switch plunger 2 intervenes.

f the fallen armature 5 is open with the switch plunger 2, which is in the closed switch position Train coupled,

J ₅ g) in the open switch position of the switch plunger 2, the elongated hole enables the armature 5 to fall off freely.

Such a discharge switch according to the invention uses a as the actual short-circuiting switch commercial vacuum interrupter, which only needs to be designed for the power to be dissipated, dyke after the end of the discharge function, this switch is opened again. Essential for the speed of sound is that the trigger mechanism is a minimuin of moving mass is required. The tripping signal gives the holding magnetic circuit by interrupting the excitation current free, whereby the retaining bracket with the switch plunger is released and one inside the tube or externally applied spring force is moved to close the switch. For this movement the armature of the solenoid is decoupled. For a quick closing process, the spring force be great. Accordingly, the lifting magnet is bulky for opening the discharge switch, and the anchor has a correspondingly large mass. During the closing process, however, only the mass of the retaining bracket is of the switching plunger and the contact piece of the vacuum interrupter moved. Furthermore, except for the switch tappet guide does not apply any further frictional forces. ω For both reasons - minimum of moving mass and friction - the requirement for a closing y.cit of 15 msec can be met.

Apart from an advantageous configuration for the closing movement, according to which the Haltcmagnetkrcis h-, contains two holding magnets arranged symmetrically / around switch plungers, is advantageous if the holding bracket ; on the side facing the Hallemagncicn Trennblceh wears. The fast closing process will

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then less of the not entirely avoidable magnetic Retention delayed.

Another advantageous embodiment provides that the mechanical coupling of the switching plunger and lifting magnet armature via an elongated hole in the switch plunger and / or lifting magnet armature with the total length in Direction of movement depends on the size of the switching stroke. This enables the mechanical coupling in a simple manner be accomplished on train and decoupling on pressure.

The invention is to be further explained using an exemplary embodiment shown in the drawing. The arrangement shown is divided into a left and a right part by a center line. The left part shows the discharge switch in the closed state, the right part in the open state, whereby the right armature part of the lifting magnet is not yet in the rest position again.

1 with a commercially available vacuum interrupter is referred to with a fixed contact piece and a movable contact piece inside. The movable contact piece is moved by an outwardly guided switch plunger 2. This Schaltstößcl 2 has a transverse bore at its outer end, through which a bolt 3 is guided. At both ends, the bolt 3 protrudes into an elongated hole in the legs of a U-shaped claw 4 slipped over the outer end of the switch plunger, the elongated holes having their length in the direction of the switching movement of the switching plunger 2 and the size of the switching stroke of the vacuum interrupter 1. The claw 4 is fixed as an extension on an armature 5, which is immersed in an electrically operated pull magnet 6. Furthermore, a tension spring 7 and 8 are attached to each of the legs of the claw 4, which hen the lifting magnet armature 5 in the direction of the vacuum interrupter I / ic- κ.

Two electrically operated holding magnets 9 and OK are attached to the right and left of the switch plunger 2. Your magnetic circuits are closed by a bracket 11, which is mechanically fixed to the switch plunger 2 is connected. On the side facing the holding magnets 9, 10, the holding bracket 11 carries a magnet Ineffective partition plate 12. The vacuum interrupter 1 is in the open switch position shown on the right the holding bracket 11 tightly against the holding magnet 10. at left In the illustrated closed switching position, the retaining bracket 11 has a distance equal to the size of the switching stroke. Adjusted precisely according to the tolerance requirements the distances between the lifting magnets 9, 10 and their mechanical ones by disc springs 13 Fortifications. Also shown is a mechanically operated microswitch 14, the. triggered by the retaining bracket 11 with the magnet circuit closed, the excitation circuit of the lifting magnet 6 interrupts.

Without any external influence, the conclusions are v> the vacuum interrupter 1 by strong Jruckfcdcrkrafl closed. In the event of electromagnetic excitation of the pull magnet 6, the armature 5 '"pulls over the claw 4 and the BoL-ί'π 3 the Schaltstößcl 2 against the compression spring force out of the vacuum interrupter 1 from the state shown on the left to the one shown on the right, until the final stroke of 7 mm, for example, is reached at a tensile force of approx. 130 N and the contact pieces are separated from each other to the required distance. In this position, the retaining bracket 11 closes the Ma- <, ■> Gnelkreisc the permanently excited holding magnet 9, 10 and switches off the excitation current of the lifting magnet 6 via the microswitch 14. The holding magnets 9, 10 echo the switch plunger 2 in this position. The armature 5 on the claw is in the rest position by the springs 7, 8 pulled out of the now no longer excited lifting magnet 6. Here, the claw 4 can be over its Langiocher move in the legs against the bolt 3 without taking it with you. The switch plunger 2 remains in his position.

When a short circuit occurs in the transmitter tube, the excitation circuit of the holding magnets 9,10 switched off The switch plunger 2 can thereby be moved by the internal compression spring force into the closed position of the contact pieces be moved, with only its own mass including the movable contact piece and the relatively small mass of the retaining bracket 11 have to be moved. As friction hindering movement only bearing friction of switch plunger 2 occurs. Because of this, the closing movement can be great can be done quickly without further delay and a closing time of 15 msec can be adhered to with certainty.

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Claims (1)

Patent claims: 1. Discharge switch in a Scndeanlagc for quick dissipation of energy in the event of a short circuit Transmission tube, characterized by the following features: a) a vacuum interrupter (1) is connected to an externally driven switch plunger (2),