DD266204A1 - DEVICE FOR INTRODUCING A PLASMALEITE TRACK FOR SHORT CIRCUIT - Google Patents

Abstract

The invention relates to a device for introducing a Plasmaleitstrecke for Kurzschliesser in electrical energy systems. According to the invention, provision is made for a conductive connection to be produced directly between two electrodes by bridging a contact needle by connecting a plasma arc between two combustion rings and leaving the plasma arc outside the arc zone. The contact needle is movably arranged in a coil system by means of spring drive.

Description

For this 2 pages drawings

Field of application of the invention

The invention relates to a device for introducing a plasma section for short-circuiters in EloktroenergloanUigen.

Characteristic of the known technical solutions

In order to shunt electric arc in a very short time and thus prevent propagating destructions by the pressure and heat stress, it is necessary to make good ear contact quickly between the busbar and ground.

A solution variant is indicated in DD-WP 221893, where an auxiliary discharge between said electrodes is realized by means of plasma gun and thereby very short Schaluoiten be brought down to less than a millisecond, However, especially in SF _e -isolierton chambers for the integrated short circuiter difficulties in breaking through the Insulation distance, at least the stored Enorgle and the entsönend Entlodospnnnung the plasma gun to increase considerably in order to convert the low at a arc fault short-circuit voltage of 500 ... 1200 V to a breakdown of the isolation distance. When even more unfavorable conditions occur, such as metal bridges with an arc fault, the applied voltages can be even lower. Also, in discharge clouds, the generated plasma channel can unpredictably occur in a wrong place, especially as in certain drive solutions oin targeted breakdown is necessary.

Object of the invention

The aim of the invention is to provide a device for introducing a plasma conductor for Kurzzeitschließor, which is structurally less expensive, cheap and reliable.

Explanation of the essence of the invention

The invention has for its object to produce a conductive connection between two electrodes in a very short time for a short tent period and thereby to produce a plasma arc,

According to the invention this object is achieved in that a conductive connection is made locally targeted between two electrodes, wherein a contact needle don electrode gap bridges by firing a plasma arc between two combustion rings and remains after ignition of the plasma arc outside of the arc zone.

The contact needle is daboi movably arranged in a Spulensystom means Federspeichorantrieb and on the one hand designed so that it is structurally held dom to swingback and on the other hand dio contact needle executed with lowor stiffness, so that they held by stinging strong force outside the arc zone by means of dimpled mat becomes.

-2- 266 204 Auigührung »beltplel The invention will be explained below using an exemplary embodiment. In the accompanying drawings show:

Flg. 1: the piln-iplelle representation of the triggering and driving device for the contact needle In a short-circuiter Fig. 2: Elnzell.dlt as a cross-section of the dimpled mat with folded contact needle

FIG. 1 shows the basic representation of the arrangement of the contact needle in the short-circuiting vessel. In a spring-store drive 2 located in the switching tube contact 1, a contact needle 3 is arranged. major Federspeicherantrlob 2 is connected via oln rope 4 with a fixed point 6, the dos rope 4, first golonkt oino roller blind 6,

with a Klinko 7 and two Sperrolemonten 8; 9 vereohon Ist and ends with tape 10 at the fixed point 5.

For the contact needle 3 In the switching tube contact 1 below its Borührungsumfanges when impacting in a Slotted counter contact 11 for the Kontnkt-needle guide, so that the contact needle 3 kontaktberührond between the also

slotted lower burner ring 12 and upper burner ring 13 can be performed.

The arrangement of the contact needle 3 shown in FIG. 1 serves for the desired occurrence of a short-circuit current. The Contact needle 3 is moved by means of a spring-loaded, live, 2, which is unlocked by a suitable trigger 14 by the fingers

fork-shaped latch 7 remains open until the two locking elements 8; 9, wherein the contact needle 3 is very fast oscillating due to an intrinsic frequency of 200-30OHz and in the maximum deflection, d. H. until the

Contact needle 3 touches the combustion ring 13, a metallic contact between the two combustion rings 12; 13 produces, so that

oln switching arc is ignited, which forwards the short-circuit current.

The continuous swing dor contact needle 3 as a result of your arrangement with spring drive 2 is through the Klinko. 7

as well as untethered by the lower barrier barrel 9 b: w. blocked, the contact needle 3 in the field shade dos

Burning ring 12 is relieved of short-circuit current, so that do ^r short-circuit current dio contact Nadol 3 flow through only about 2 ms

can. The contact needle 3 itself has a high rigidity, it being expedient to arrange the contact needle 3 in the

Area of weak magnetic fields dor arranged in the short-circuiting counter-current-flow coils 15; 16

make.

The avoidance of the thermal stress due to the ignited switching arc takes place by retrieving the Contact needle 3 by Federspolchernntrieb 2, by means of cable 4 by the arrangement of the pawl 7 on the

upwardly moving switching tube contact 1 through the arranged at the fixed point 5 band 10 in his tense

Initial state is offset by a locking element 8 is locked by the pawl 7, ro that boim

open the short-circuiter the contact-Nadol arrangement is again in heror starting position.

Another possibility of the contact needle arrangement is to contact the needle 3 with a low stiffness, z. B.

from a plurality of parallel elastic metal wires, and to arrange the contact Nadol 3 in the region of such a Magnetfeidosdor Btromtransformed in the short-circuiter arranged coils 15; 16 to lead, so that a flipping dor contact needle 3 intangentialer direction takes place on the fuel ring 12 and thus a rapid discharge of the contact Nadol 3 is ensured by the short-circuit current.

The contact needle 3 itself must be designed so that they don donated short-circuit current for a limited period

can, without reaching too high a temperature, where a small moment of inertia τ. Β. realized by many parallel wires lying parallel, for dlo electrodynamic force stress must be present so that the contact nadol 3 werdon fixed on a nubbed mat 18 with nubs 19 long.

The contact needle 3 lies down on the Isoliortrichtor 17, whose surface is formed as a dimpled mat 18, so that

the contact needle 3 as shown in Figure 2, anchored in the knobs 19.

In contrast to the 1st Ausführungsboispiel the lower Sperroloment 0 can be omitted, since the contact Nadol 3 by the Umlegon

at the fuel ring 12 -take time from the Brennberoich dos switching arc is removed.

Due to the upward movement of the switching tube contact 1 during the switching process in the short circuiter is in the Noppenmatto 18 anchored contact needle 3 pulled out and is by means of Fedorspoicherantrieb 2 in rope β starting position

vorklinkt.

Claims (5)

1. A device for introducing a plasma guide for short circuit with plasma conductor, characterized in that a contact needle (3) within a coil system in a switching tube contact (1) positioned foderspeicherantrleb (2) is arranged to move and the contact noodle ( 3) for introducing the plasma tissue between two Brennringon (12; 13) is located. 2. Device for introducing a plasma conductor for short-circuiting with Plasmaleitstrecke according to claim 1, characterized in that the spring drive (2) by means of rope (4) via a roller (6), via locking elements (8; 9) and a band (10) is connected to a fixed point (5). Third means for introducing a plasma circuit for short circuit with plasma conductor according to claim 1 and 2, characterized in that the contact needle (3) is designed with a high needle natural frequency by means of needle made of hard metal with a pipe cross-section. 4. means for introducing a Plasmaleitstrocke for short-circuiter according to claim 1, gekonnzeichnet in that the contact needle (3) is designed with a low needle natural frequency of elastic material and the cross section of a plurality of parallel wire tone is composed. 5. A device for introducing a Plasmateilstrecke for short-circuiting with Plasmateilstrecke according to claim 1-4, characterized in that an insulating funnel (17) with a dimpled mat (1 b) is designed.