DD215663A1 - DEVICE FOR FAST SHORT-CIRCUITING OF A CIRCUIT - Google Patents

Abstract

The invention relates to a device for fast short-circuiting of a circuit in electrical networks to protect high-quality equipment parts in auftreenden Kurzschlussstroemen. The solution according to the invention is intended to make it possible to reliably short-circuit the system part to be protected even before the occurrence of the first maximum of a short-circuit current and to create the conditions for an economic system design. The object of the invention is to interrupt even the highest operating currents in the event of a short circuit even before reaching the first maximum of the short-circuit current and without disconnecting the main current path and extinguishing an arc. It is essential to the invention that an insulating tube, which is arranged between high voltage and ground potential, contains a detonating cord and an ignition device and is in communication with a cylinder and pistons located therein. In the event of a short circuit, a conductive connection between the live parts is briefly caused by a plasma until the simultaneously generated plasma pressure has brought a mechanical part of the short-circuiting device into a closed state.

Description

J of the invention .

Facility for. fast course solieBeη of a circuit. , '. · ''

Field of application, the invention ''. '

The invention finds application in 'electrical rush to protect high quality equipment parts, occurring

high closing prices in the rush.

Characteristic of the known technical solutions

Short circuits in electrical systems pose by the. The associated high short-circuit currents are a heavy burden on the components of the plant. .loading depends on the level of the short-circuit current. (Current forces) and, of its duration (thermal load), Ss is common, the short-circuit current through a power

^: / · · '' Switch to interrupt and so the system again: to

loads. Modern switches have turn-off times of 40 ms, so that the short-circuit current is at least 40-50 sis long

'flows,. , '^;'· ·. , '. , '. ^:

For a significant reduction in material use - a further shortening of the''Belastungszeit is required. The highest hat is achieved when the sensible

'I'er, parts of the plant' would not at all be traversed by the short-circuit current.

, ·,. - 2- '..-' - '··

It is known to achieve this goal by shunting the part under consideration by means of a fast short circuiter so that the short circuit current flows essentially through the short circuiter and only a small part through the system. For this purpose, mechanical short-circuiters have been built, the switching elements are driven by an explosive (explosion drive) .. Although these devices produce a good metallic contact, but are not in the'lage, still sufficiently long before the first maximum of the short-circuit current to be protected part of the plant short-circuit. >

For limiting and interrupting short-circuit currents in high-voltage switchgear · Fast-switching devices are also known (DB-OS 2905747). in which an explosive charge a Sprengleiter., Divided and the arc voltage, the current commutated to a parallelgeschalteten 'fusible conductor, which interrupts the current quickly and thus limited »current limit ranking facilities of this type, however, are only to achieve a rapid separation of Strombaiin. A course closing is not given because of lack of connection 'between high voltage potential and 3rde. It is also not possible to render the separated part electrically conductive again and to achieve a continuance of the separated circuit. Sin reconnection is only achieved by connecting additional current-limiting devices with a short-circuiting device in parallel. Such a measure is not only expensive, but also expensive, because for each reclosing process ^; a short-circuiter and a current-limiting device becomes necessary ». , ... ··. '. '.

Object of the invention . '' -

The solution according to the invention should make it possible, in particular in comparison with conventional mechanical components.

advised to the limit and. Interruption .of short-circuit current through a short-circuiting device already before the occurrence of the first maximum of a short-circuit current, the protective part of the system is reliably short-circuited, thereby ultimately creating conditions for a more economical 'plant design'.

Explanation of the 'invention of the invention; ... 'ι>'. '

The invention has for its object to provide a device "for fast short-circuiting of a circuit 'of" parts λ an electrical system, - which makes it even-highest operating currents in' liurzschlußfall already before. Reaching the first maximum of the short-circuit current and disconnecting without breaking the main current path and clearing a ^:: arc. ''',

In addition, the device should also flow repeatedly in the case of recurring course flows _; Addressing time intervals easily, '

According to the invention, the object is achieved in that ^: between high and low potential of the protected component of an electrical system, an insulating tube is arranged, which in the interior is a detonating cord, which measures the distance between the potentials for avoiding leakage currents not completely bridged, and at the efd-, side end contains a known per se ignition device. The detonating cord in the insulating tube is tensioned between Bra potential and an insulation supporter, which is fastened at a defined distance from the high-voltage potential (corresponding to the height of the potential, inside the insulating tube.) If the length of the insulator is chosen correctly between the high-voltage source and the end of the explosive cord ensures that no creepage current can flow between them between both electrical potentials

'-4-

* ♦

Conditions (such as ζ, B, low! Humidity) in the short-circuiter, in other words, to maintain a high electrical, dielectric strength in the insulation pipe, selected chemicals must be incorporated accordingly.

The open, earth-side end of the insulating tube is connected to a cylinder in which a piston is arranged, which in turn is connected via a linkage to the mechanical part of the short-circuiting device Sprengschnur between the live parts in the insulating tube creates a conductive connection through a plasma and this persists, while the current transport briefly assumes until the simultaneously generated plasma pressure has brought the mechanical part of the Kurzs.chließer-Sinrichtung in a closed state »· In contrast to high-speed switching devices for limiting and interrupting short-circuit currents, in which an explosive charge separates the electrical conductor and the explosive gases serve to blow out the arc formed at the point of separation, and the arc voltage directs the current to a parallel circuit Fusible link or one on current limiter ^ -'- and ünterbrechungseinrichtung ^: commutate, with the.erftüngsgemäßen device as. Short-circuiter and the emergence of explosive gases achieved another effect, '' - -

The advantages of the invention are, in particular, see below that the page until short-circuiting, at <0.5 ss. reliably, even before the first maximum of the short-circuit current is reached, the short-circuiting device functions and a transient rise in the 'short-circuit current to extremely high values is avoided'.'*

Ultimately, economic aspects can be fulfilled in the plant design 3 "3, by reducing the material unity". - by.electric switchgear and devices

no longer dimensioned for the full short-circuit current flow. will need. Advantageously, the inventions ·. ·. Plication contemporary JSinri rect can be designed such that by parallel connection of several insulating tubes with detonating cords> · .. · '·''. *

and Zündvorrichtungen a short-circuiting of a short-circuit current in a direct sequence is possible without having to be made to '' the short-circuiting device after the first operation maintenance.

Execution is pie1 , ''. ,

The solution according to the invention will be explained in more detail below with reference to an exemplary embodiment. In the accompanying drawings: FIG. T: shows a view of a short-shifter sigma direction. ; v, or the short slip case in initial position, 'Fig. 2 :; a view of several parallel connected

•. Insulating tubes to a shortshead device. , · Before the ^ short-cut in the initial position,

Between Hochspannungs- and Srdpotential a to-schütsen- the component of a "elektrii Anläge is according to Jig -ein'Isolierrohr · arranged, which in -Inneren a detonating cord 'of a defined length and on the er erdseitigeii B Bnde ' " a , known per se ignition device 3 as a means for. Production of the explosive Ready to fire.

, The open, earth-side end of the insulating tube is included

, '. - · · ν '..--.

a cylinder 4 in connection, in which a piston 5 is arranged, which in turn via a; Buffer spring (not shown) and linkage with the mechanical part of the course close rs β communicates. »- / Z-Ur. Operation of the short-circuiting device is a discharge pulse of one Measuring point of short-circuited network necessary «This impulse causes' because the ignition device

'Detonating cord detonated''.. /. , ;. _: 'Uacn ignition of the detonating cord moves the active zone

gaseous combustion products at a rate of ^. 1000 m / s to the live upper end of the insulating tube. The insulation is filled with a highly conductive plasma, at the same time, pressure builds up in the cylinder and the piston is made in \ movement.

In the rear part of the cylinder there are several holes 7 so that the explosion plasma can escape. When generating explosion plasmas with very high pressures, it is expedient also to introduce bores (not shown) in the upper part of the insulating tube in order to prevent an explosion of the Prevent insulating pipe. After Slemitierung the occurred in Hetz short-circuit current through the invention Kursschließer-Sinrichtung becomes. Breaking the connection between Ho chapannungs- and - potential, the mechanical part of the course closer β by a conventional motor drive 8 in the output I age, '· moved, whereby the original mode is again niöglieh. , ^; '',. , ' The. mechanical part of the short-circuiter 6. can also be designed so that it is attached to both ends of the insulating tube *.

In the BIurzschließer device of Figure 2 are a plurality of insulating tubes 1 with detonating cords and igniters · ^; .parallel connected and form with otherwise the same arrangement more advantageous ^{; veise:} DIE prerequisite is that a short-circuiting a short-circuit current in the nearest-fo Ige is possible without actuation by the first maintenance must be made in the course closer mechanism '"^...

Claims (3)

He ι in dungs ans pru ch 1. Device for short-circuiting a circuit in power supply stations, in which a switching element is driven by explosion of an explosive, characterized in that an isotope tube (1.), which has a high voltage potential and an earth potential a detonating cord (2) ', which does not completely bridge the distance between the potentials, and an ignition device (3), - stops and at the open earth-side end with a cylinder (4). and therein piston (5) is in Terbih- .Dung and in KurζSaulfall. after ignition of the detonating cord'between the live parts 'briefly creates a conductive connection through a plasma,' until, the simultaneously generated plasma pressure , the mechanical part (6) of the short-circuiting device - brought into a closed state _a '· 2. Device according to item 1, .gekennzeichnet characterized in that the mechanical part of the short-circuiter. (6) is connected to a 'conventional motor drive (8)' 3 »device according to item 1 and 2, characterized that, several insulation tubes with detonating cords and " ^: ignition devices are connected in parallel"