DD218709A2 - METHOD FOR LOADING A SHIFT ARC IN ELECTRIC SWITCHES - Google Patents

Abstract

THE INVENTION RELATES TO A METHOD FOR DELETION OF SWITCHING ARC IN A GASGEFUELLTEN LOESCH CHAMBER OF ELECTRIC SWITCH FROM WHICH THE REDUCTION OF THE ELECTRICAL CONDUCTIVITY OF SWITCHING ARC PLASMA EFFECT IS BY THE CONTROL MEDIUM BEFORE SHUTDOWN UA by external or internal RESOURCES ON PRESSURE RISES TO AT A ABOVE INSTABILITAETSBEREICHES A NON-IDENTAL GASES VALUE IS CAUSED AND THEN A NEGATIVE PRESSURE PULSE IS MADE. THE OBJECTIVE OF THE INVENTION IS TO PRODUCE ONLY A DEFINED, SHORT-TERM PRESSURE PUMP ONLY DURING THE INITIAL PHASE OF THE DISCONNECTION OPERATION IN THE LOESCHKAMMER SO THAT, AT THE SAME TIME, A DIMENSIONING OF THE LOESCHKAMMER AS A HIGH-PRESSURE FAILURE SUCH AS A STATIONARY OPERATION WILL CONTINUE. ACHIEVED THIS BY IN THE CLEAR CHAMBER AT THE TIME OF THE INTRODUCTION OF A disconnection AFTER THE CLEAR CHAMBER PREVIOUS A RELATIVELY SMALL STATIC PRESSURE OF SOME 01, MPA HELD, ON DEFINED PRESSURE RISES brought IS BY STORED, HIGH strained CONTROL MEDIUM IN THE CLEAR CHAMBER BROUGHT, OR BY GIVING A SPARKLING ELEMENT.

Description

Title .der invention

Method for extinguishing a peeling arc in electrical switches,

Field of application of the invention

The invention, which is effective in the field of electric power supply, relates to a method for extinguishing a switching arc in a gas-filled quenching chamber of an electrical switch, in which "before or / and during a switching operation by internal or external means and / or by the free energy of, burning switching arc in the quenching chamber a pressure rise is brought up to a value lying above the instability of a non-ideal plasma and after reaching the required pressure and temperature values ¹ during the switching process such a negative, depending on the gas used pressure pulse on the non-ideal plasma is applied so that a phase transition from a plasma with high electron density above the instability region to an electron density lying at a lower, below the instability range, after '\ jp

Characteristic of the known technical solutions. ,

For the realization of high switching capacities with a switching path with at the same time, with a small energy expenditure within a JTuIldurchganges the current possible extinction

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a scarf without a bow. Re-ignition of the arc by the recurrent voltage has been proposed according to the patent application WP H 01 E / 221 319 before and / or during the switching operation by internal or external means and / or by the free energy of the burning switching arc in the quenching chamber Druckanstieg'bis bring about a value lying above the instability range of a non-ideal plasma and after reaching d, he required pressure and temperature values during the Schaltvorgahges such negative, depending on the particular gas pressure pulse applied to the non-ideal plasma ^l that a phase transition of a plasma with. With this method is indeed achieved that the electrical conductivity of the arc plasma is reduced to the required magnitude, however, no further process steps are shown, in particular by internal or external Agent in the quenching chamber, a pressure increase is to be brought up to a lying above the instability range of a non-ideal plasma value. ,

Object of the invention:

The aim of the invention is to generate a defined, short-term pressure pulse only during the initial phase of the shutdown in the quenching chamber, so that a dimensioning of the quenching chamber as a high-pressure vessel as in ein.stationären mode of operation is discontinued.

Explanation of the essence of the invention

The invention is based on the object, in a method for deleting a switching arc in a gas-filled. Extinguishing chamber of an electric switch, after W? H 01 H / 227 319, to achieve the pressure increase to be brought about in the quenching chamber, except for a value lying above the instability range, essentially by means of media or means directly available at the quenching chamber.

According to the invention, therefore, in the quenching chamber at the time of initiation of a disconnection process, after the quenching chamber is previously maintained at a comparatively small static pressure of some 0.1 MPa, a defined pressure increase caused by "either _stored,: highly strained switching medium via a controllable quick valve by Preferably, a channel located in the stationary contact is introduced into the quenching chamber or by ignition of an explosive element introduced, for example, by the fixed contact.

y / ird a defined increase in pressure caused by ignition of an explosive element, the mixture of explosive gases and original switching medium is released from the quenching chamber and replaced by a check valve by a new switching medium shortly before the end of the switching process via a fast, controllable discharge valve.

Since the quenching chamber is held after each, AusschallVorgang and during the Sinschal tvorganges only under a comparatively small static pressure of some 0.1 .MPa, is

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ira actual high-pressure storage tank no very high static pressure more necessary, so that no special / high conditions to be placed on the design of the high ^Λ pressure supply tank more need. It follows, however, that for the SinsehaltVorgang only relatively little power is needed, so that the switch-on a spring force memory is made by the movable contact by preferably one with the spring energy storage indirectly related movable baffle and Push body is moved to the closed position.

Although the quenching chamber is kept under a comparatively small static pressure after each turn-off operation and during the Einsehaltvorganges, a sufficient dielectric strength of the switching path is ensured because the volume of the quenching chamber is reduced at power-up, resulting in an increase in pressure.

Embodiment - '. ,

The invention will be explained in more detail below with reference to two exemplary embodiments.

1 shows a section of a high-voltage circuit breaker in which a defined increase in pressure in the quenching chamber takes place through high-voltage switching medium introduced via the stationary contact;

2 shows a section of a high-voltage circuit breaker in which a defined increase in pressure in the quenching chamber is renewed by ignition of an explosive.

ι

.he follows.

Be the high-voltage circuit breaker shown in Fig. 1, a defined increase in pressure at the time of initiation of the switch-off in the quenching chamber 3 caused by stored in a high-pressure vessel 14, high-voltage switching medium via a controllable quick-action valve 15 through the channel located in the fixed contact 1 .16 is introduced into the quenching chamber 3, so that it is possible with the help de.s controllable quick valve 15 to act on the switching path for a short time in response to the switching Str.om. The inflowing switching medium within the quenching chamber 3 impinges on the movable contact 2 and causes an outward acceleration of the movable contact 2 from _: the quenching chamber 3, when the control valve '4 is in the open state. The resulting after the contact separation switching arc then causes a further increase in the pressure in the quenching chamber. 3. A rapid countersink, in the quenching chamber 3, which is necessary to the method according to the patent application W? Ή 01 H / 227 319 is achieved not only by increasing the volume in the extinguishing. Chamber 3 is achieved by the movable contact 2 is moved out of the quenching chamber 3, but also by deliberate release of the switching medium via the fast, controllable discharge valve 12. Although the Pig. 1 shows a high-voltage circuit breaker, which also provides for the switch-on a compressed gas drive, this Sinschaltvorgang can also be done by a spring energy storage drive, since the quenching chamber 3 only: under a pressure of some 0.1 MPasteht.

According to the high-voltage circuit breaker of Fig. 2 is to bring about the defined pressure increase within the quenching chamber 3 by the fixed contact 1 a Sprengst off element 17 in the form of a tablet by a transport * - vessel 18 introduced, which is ignited at a defined time. After ignition this arises in dependence »

from the amount of explosive a short-term pressure increase and the movable contact 2 is accelerated out of the quenching chamber 3. Shortly before the end of the switching process, the mixture of explosive gases and original switching medium in the quenching chamber 3 is quickly released via a fast, controllable discharge valve 19 and replaced by a new switching medium. This <Gasaustauschprozefl is initiated by the opening of the fast, controllable Ausströmventiles 19 · The check valve 20 is set so that when lowering the pressure in the quenching chamber 3 to a predetermined pressure, for example, some 0.1?> Ä? A, the check valve 20 opens. Tray aus.Experimenten a certain period of time for Gesarntaustausch- and 'flushing process, the fast, controllable discharge valve 19 is closed so that again a very high voltage' fixed switching medium in the quenching chamber 3 is.

  The switch-on process takes place via a spring-energy storage drive 21 in that the movable contact 2 is moved into the switch-on position by means of the force-transmitting element 22. ,

Claims (2)

Claim of invention. ·. , A method for extinguishing a switching arc in a gas-filled quenching chamber of an electrical switch, wherein before or / and during a switching operation by inner öder outer means and / or by the free energy of the burning switching arc in the quenching chamber, a pressure increase to one above the instability region · a non-ideal plasma lying value is brought about and after reaching the required pressure and temperature values during the switching process such a negative, depending on the particular gas pressure pulse is applied to the non-ideal plasma that a phase transition from a plasma with high electron density above the instability to a with low, below the .Instabilitätsbereiches lying electron density occurs, according to Patent -j- ^ O 3 £ .3, · characterized in that in the quenching chamber at the time of initiation of a switch-off after the quenching chamber previously under a comparatively small static pressure of a few 0.1 MPa. a defined increase in pressure is brought about by either stored, high-tensioned switching medium is introduced via a controllable quick-acting valve into the extinguishing chamber through a channel preferably located in the stationary contact or by ignition of an explosive element introduced, for example, by the fixed contact. Method according to item 1, characterized in that when bringing about a defined increase in pressure by ignition of an explosive element just before the end of the switching process via a fast, controllable discharge valve, the mixture of explosive gases and original switching medium out of the quenching chamber and over. a check valve is replaced by a new switching medium. , , 3. The method according to item 1 and 2, characterized in that there is a further increase in the pressure in the quenching chamber by the resulting after contact separation switching arc. 4. The method according to item 1 to 3, characterized in that the switch-on is carried out via a spring energy storage by the movable contact is moved by preferably a indirectly connected to the spring energy storage movable power transmission element in the closed position. , , For this .. "A ... pages drawings