WO2007051320A1 - Self-blowing switch with gas precompression - Google Patents

Abstract

A self-blowing switch (1) has, in addition to a quenching chamber (5), an intermediate chamber (6), into which gas heated by an arc (16) flows when the switch (1) is interrupted. No gas heated by the arc (16) flows into the quenching chamber (5). A pressure which is built up in the intermediate chamber (6) exerts a force on the chamber walls. The switch (1) is designed such that, in the case of an elevated pressure in the intermediate chamber (6), it makes it possible to increase the volume of said chamber. If the volume of the intermediate chamber (6) is increased, the volume of the quenching chamber (5) is reduced. Owing to the reduction in volume, the cold quenching gas stored in the quenching chamber (5) is compressed and blown into the arc zone (16a) through a quenching channel (11). The cold quenching gas makes more efficient quenching of the arc (16) possible.

Description

 Self-blow switch with gas pre-compression

DESCRIPTION

Technical area

The invention relates to a self-blowing switch and a method according to the preamble of the independent claims, in particular for high or medium voltage.

State of the art

A Selbstblasschalter known type is in the

DE 198 59 764 described. It has a rod-shaped inner contact (arcing contact pin) and an annular outer contact (arcing contact tulip). If the two contacts are disconnected when the switch is opened, an arc is created between the contacts. In addition, the switch has a small control volume and a larger extinguishing volume and at their common inflow and outflow a valve. Gas heated by the arc first flows into the control volume and into the extinguishing volume. When the pressure in the vicinity of the zero crossing in a zone around the arc and thus also in the control volume drops, the small control volume empties relatively quickly. The pressure in the control volume drops below those in the larger extinguishing volume and a partition wall between the control volume and extinguishing volume shifts in the axial direction. Thereby, the valve is released and a di rect ^¬ connection between the extinguishing of the light volume and ^¬ arc zone created so that the relatively cold quenching gas extinguishes the arc. Although the Lδschgas has a lower temperature in this switch, it is still relatively hot gas, since it has initially flowed directly from the arc in the extinguishing volume. In addition, the tax and Extinguishing volume via an overflow in connection with each other and exchange hot gas with each other. The two volumes (control volume and volume) thus store gas heated by the arc. However, a high temperature of the Lδschgases reduces the switching capacity of the switch.

Presentation of the invention

It has as its object to provide a switch of the type mentioned and a method with improved turn-off.

This object is met by the switch and the switching method according to the independent claims.

In a first aspect, the invention relates to a self-blowing switch having a first arcing contact and a second arcing contact, wherein when the switch is turned on, the first arcing contact is in contact with a contact portion of the second arcing contact, with interrupting the switch of at least one of the arcing contacts along an axis the switch is movable such that between the arcing contacts an arc extinguishing zone is formed, wherein a quenching chamber is present in the

Is stored cold gas and at least temporarily via an extinguishing channel in communication with the arc extinguishing zone, an intermediate chamber is present at least temporarily via an inlet channel with the arc extinguishing zone in communication, and means for pressure communication or for pressure connection or pressure exchange, also Pressure exchange means called, between the intermediate chamber and the quenching chamber are present, further

- The Lδschkanal in a ^ first arc phase is closed so far that heating of the

Cold gas in the quenching chamber is largely prevented by back-flowing hot gas from the arc extinguishing zone in the quenching chamber, - The inlet channel to the intermediate chamber is opened so far that the hot gas from the arc extinguishing zone can flow into the intermediate chamber and the means by means of the inflow of the hot gas into the intermediate chamber cause a compression of the cold gas in the quenching chamber and

- The extinguishing channel is opened in a second arc phase, so that the compressed cold gas can flow out to the blowing of an arc between the arcing contacts in the arc extinguishing zone. In a further aspect, the invention resides in a method of switching electrical power in a self-blowing switch comprising a first arcing contact and a second arcing contact, wherein when the switch is turned on, the first arcing contact is in contact with a contact region of the second arcing contact, thereby interrupting Switch at least one of the arcing contacts along an axis of the switch is moved such that between the arcing contacts a Lichtbogenlδschzone is formed, wherein a quenching chamber, is stored in the cold gas is at least temporarily connected via a quench with the arc extinguishing zone, wherein an intermediate chamber is present, which is at least temporarily connected via an inlet channel with the arc extinguishing zone, wherein the intermediate chamber and the quenching chamber are in pressure communication with each other, characterized in that during a switching operation

the extinguishing channel is closed in a first arc phase to the extent that the hot gas is prevented from flowing back out of the arc extinguishing zone into the extinguishing chamber, and heating of the cold gas in the extinguishing chamber is largely prevented,

the inlet channel to the intermediate chamber is opened so far that the hot gas can flow from the arc extinguishing zone into the intermediate chamber, a volume of the intermediate chamber is increased by a build-up of hot gas pressure in the intermediate chamber and thereby a volume of the extinguishing chamber is reduced nert and the cold gas is compressed in the quenching chamber, and

- The extinguishing channel is opened in a second arc phase, so that the compressed cold gas is discharged into the arc extinguishing zone and an arc is blown between the arcing contacts by the cold gas.

In this switch and method therefore an intermediate or pressure chamber is present in addition to a quenching chamber. In the intermediate chamber heated hot gas flows from the arc when the switch is open. A pressure building up in the intermediate chamber exerts a force on the chamber walls. The switch is designed in such a way that, when the pressure in the intermediate chamber is increased, it makes it possible to increase its volume. As the volume of the intermediate chamber increases, the volume of the quenching chamber decreases. Due to the volume reduction, the extinguishing gas is compressed and blown through the extinguishing channel.

An advantage of the self-blowing switch is that less arc heated gas flows into the quenching chamber. Cooling of the Lδschgases is therefore not required. The extinguishing gas is therefore, in contrast to known solutions, relatively cold, resulting in a more efficient extinguishing of the arc. In addition, the pressure build-up in the intermediate chamber supports the mechanical drive and thus the mechanical drive requires less force to disconnect the switch.

In preferred embodiments, a backflow of hot gas from the arc zone into the quenching chamber is completely prevented, as well as an overflow of hot gas from the intermediate chamber into the quenching chamber. For this purpose, the pressure exchange means for gas-tight separation of the quenching chamber should be designed by the intermediate chamber. As a result, the cold gas remains unmixed and has a high extinguishing power at the "cool" blowing of the arc. It is also advantageous in terms of flow dynamics that the flow reversal characteristic in the heating channel or extinguishing channel, which is characteristic of self-blowing switches, is eliminated and thus affects everyone Timing ordered flow conditions prevail in the Lόschkam- mer and in the extinguishing channel and a very fast reaction time for the arc blowing can be achieved.

According to other embodiments, the extinguishing chamber with the extinguishing channel as close to the

Arc quenching zone arranged, whereas the intermediate chamber or pressure chamber is spatially separated by a Heissgasabströmbereich of the arc extinguishing zone. As a result, the cold gas is available close to the arc extinguishing zone and the hot gas in the intermediate chamber no longer returns to the arc extinguishing zone. This also enables efficient cool arc blowing.

In another embodiment, the pressure compensation means comprise a piston arrangement for simultaneously increasing the volume of the intermediate chamber and reducing the volume of the extinguishing chamber. Preferably ^{~ "dϊeT} piston assembly comprising the first and second partition, the first partition wall is movable, in particular axially displaced, and / or the second partition wall is movable, in particular axially displaceable and serves as a driving piston to a volume-reducing displacement of a wall of the chamber.

Other embodiments relate to further design details for the realization of the quenching chamber and intermediate or pressure chamber with oppositely variable volumes.

In a preferred embodiment, the hot gas pressure in the intermediate chamber and thus the compression pressure in the quenching chamber is increased by an ablation self-blowing effect in the switch, in particular on its insulating nozzle.

Brief description of the drawings

Further embodiments, advantages, novel features and applications of the invention will become apparent from dependent claims and claims combinations and from the following detailed description with reference to the drawings. In the drawings, like elements have the same reference numerals. In the drawings show:

1 shows a section through a switch in the on state,

2 shows the switch according to FIG. 1 in a first phase when the switch is interrupted, FIG.

Fig. 3 shows the switch of Fig. 1 in a second phase in interrupting the switch, Fig. 4 shows the switch of Fig. 1 in a third phase in interrupting the switch.

Ways to carry out the invention

The embodiments of a switch 1 shown in the figures are each constructed substantially rotationally symmetrical about their axis A, for which reason only half of the respective section is shown.

Figure 1 shows a first embodiment of the switch 1 in the switched (ie conductive state). The switch 1 has an outer contact 2 (arcing contact tulip 2), which extends in an annular manner about the axis A, and an inner contact 3 (arcing contact pin 3), which is generally of rod-shaped or tubular construction. The outer contact 2 is arranged in a ring around the central axis (axis A) of the inner contact 3. The two arcing contacts 2, 3 are relative to each other in the axial direction by a mechanical drive not shown displaced. In the embodiment shown in Figure 1, the contact tulip 2 is stationary and the contact pin 3 movable, for example, to the left, which is indicated by an arrow P. FIGS. 1-4 illustrate the left-hand movement of the contact pin 3 away from the contact tulip 2. Other relative movements, eg. B. the contact tulip 2 alone or both arcing contacts 2, 3 by double drive, also by any non-linear Double drive, are also possible. The switch 1 may in principle be any arc extinguishing switch 1, z. For example, a high-voltage circuit breaker 1, high-current switch or power isolator, in which use is made of a self-blowing effect or the arc blowing is supported by a Selbstblas- effect.

To the arc contacts 2, -3 is a two-part Schalterkδrper 4a, 4b arranged, which carries the rated current contacts 4a, 4b. The switch body or rated current contact 4a essentially surrounds the arcing contact tulip 2, and the switch body 4b or rated current contact 4b the arcing contact pin 3. If the rated current contacts 4a, 4b separated, commutes' the current to the arcing contacts 2, 3, which are then separated such that between the arc contacts 2, 3, an arc extinguishing zone 16a is formed, as shown in Figures 2-4.

The switch 1 has a quenching chamber 5, an intermediate chamber 6 and an exhaust chamber 7, here in the

Switch body 4b are realized, but also in the contact pin-side switch body 4a may be present. A partition wall 9 separates the quenching chamber 5 from the intermediate chamber 6, and a partition 14 having a valve 14 separates the intermediate chamber 6 from the exhaust gas chamber 7

Valve 14 is a pressure relief valve / which allows gas from a predetermined pressure to flow from the intermediate chamber 6 into the exhaust gas chamber 7. As a result, the pressure in the intermediate chamber 6 is limited to the pressure defined by the valve 14.

The quenching chamber 5 extends between an inner side of the switch body 4b, an insulating nozzle 8 and the partition wall 9, and the intermediate chamber 6 extends between the partition walls 9, 10 in the axial direction. The partition 9 has, as shown in Figures 1-4, two parts 9a, 9b, which extend parallel to the axis A, and a perpendicular part 9c, which connects the two paraxial parts 9a, 9b with each other. The partition wall 9 and the switch body 4b are displaceable relative to each other in the embodiment shown. This results in a respective variable volume for the quenching chamber 5 and the intermediate chamber 6, which depends on the operating state of the switch 1. In the closed state of the switch 1 (Figure 1), the quenching chamber 5 has a large volume, and the intermediate chamber 6 has a small volume. In the open state of the switch 1 (Figure 4), however. the extinguishing chamber 5 has a small volume, and the intermediate chamber 6 has a large volume. The exhaust gas chamber 7 has an example of a substantially constant. Volume.

In the open state (FIGS. 2-4) of the switch 1, the quenching chamber 5 can communicate with the arc quenching zone 16a between the arcing contacts 2, 3 via a quenching channel 11. An intake passage 12 permits communication, ie, a gas exchange between the intermediate chamber 6 and an inner space 15, and a drain passage 13 permits communication between the exhaust chamber 7 and the interior space 15. The interior space 15 forms a hot- gasabströmbereich 15, typiseherw ^'else in Form of a hollow contact volume 15 in one of the arcing contacts 2, 3, and is in communication with the arc extinguishing zone 16a. In FIG. 1, the axially parallel part 9a closes the inlet channel 12, and an extension 3a of the contact 3 closes the extinguishing channel 11. The outlet channel 13 can be closed by a housing part 18.

The operation of the switch 1 according to FIG. 1 can be seen from the switch-off process illustrated in FIGS. 2-4. For interrupting or switching off the switch 1, the mechanical drive pulls the arcing contact hollow pin 3 together with the switch body 4b along the axis A away from the arcing contact tulip 2. In this case, as shown in Figures 2-4, an arc 16 between the arc contacts 2, 3. The area in which the arc 16 burns during turn-off is also referred to as arc extinguishing zone 16a. The arc 16 heats the gas in the arc quenching zone. zone 16a. The arcing contacts 2, 3 are surrounded by an insulating material nozzle 8 (eg made of Teflon). The arc 16 burns off material from adjacent walls (eg, insulation material), resulting in pressure buildup in the arc extinguishing zone 16a.

The mouth of the quenching channel 11 is arranged in the switch 1 between the insulator main nozzle 8 and the auxiliary nozzle 8 so as to be close to the arc zone 16a. The mouth is preferably configured such that, although the extinguishing gas can flow out of the extinguishing chamber 5 in the direction of the arc 16, the entry of hot gas into the extinguishing chamber 5 is largely prevented. In contrast to known switches (DE 198 59 764), therefore, the quenching gas is not heated by hot plasma emanating from the arc 16. The quenching gas does not come into contact with the plasma and does not need to be cooled by other means.

In one embodiment, the size of the orifice may be as small as possible so that the gas flows in the direction of least resistance, i. along the axis A in the direction of the now open inlet channel 12, and thus not in the extinguishing channel 11. In another embodiment, a one-way valve (eg., A flap valve) may be present in Lδschkanal 11. Alternatively or in addition to the design of the mouth, the piston movement for compression of the quenching chamber 5 can also be controlled in the switch 1 so that upon release of the Lδschkanals 11, the pressure in the quenching chamber 5 is already higher than in the arc extinguishing zone 16a, so that also by a backflow of hot gas in the quenching chamber 5 largely prevented or completely impossible hich is.

During the first phase shown in Figure 2 when breaking the switch 1, the arc 16 has formed. The channels 11, 12 are open in this phase, and the discharge channel 13 is closed by the housing part 18. Since the flow resistance in the axial direction away from the arc 16 is relatively small, hot plasma flows due to the pressure build-up in the vicinity of the arc 16 through the now open inlet channel 12 into the intermediate chamber 6. This is indicated in Figure 2 by an arrow 17. In the intermediate chamber 6 increases according to the pressure. The increased pressure assists that the distance between the dividing walls 9, 10, and thus the volume of the intermediate chamber 6, increases. As the volume of the intermediate chamber 6 increases, the volume of the quenching chamber 5 decreases. The decreasing quenching chamber volume 5 pushes cold gas through the quenching passage 11, thereby initiating the quenching of the arc 16.

In the second phase shown in FIG. 3, the volume of the intermediate chamber 6 continues to increase. The channels 12, 13 have shifted with respect to the housing part 18 so that the housing part 18, the inlet channel 12 partially closes and the outflow channel 13 is already partially free. The flow resistance in this phase in the direction of the exhaust gas chamber 7 is less than in the direction of the intermediate chamber 6. As a result, hot plasma now flows mainly through the Äbflusskanal 13 in the exhaust chamber 7. This is indicated in Figure 3 by an arrow 19. In the intermediate chamber 6 changes according to the pressure only slightly. In the third phase shown in FIG. 4, the inlet channel 12 is closed and the hot plasma flows through the outlet channel 13 into the exhaust gas chamber 7. The arc 16 has already been extinguished by the cold gas from the quenching chamber 5. An advantageous timing of the

Switching operation may thus include the following elements or method steps: In the first arc phase, the extinguishing channel 11 should be closed, so that no hot gas flows from the arc extinguishing zone 16a into the extinguishing chamber 11. In the second arc phase, the extinguishing channel 11 should have an opening to the arc extinguishing zone 16a. The first arc phase is characterized by a high arc current and a strong gas heating in the Arc 16 characterized. The second arc phase is characterized in that a backflow of hot gas from the arc extinguishing zone 16a into the quenching chamber 5 is prevented. This can be realized by the pressure ratio or by the flow resistance or the flow geometry, in particular in the region of the mouth of the oil chamber 5. In particular, the second arc phase may be characterized in that the pressure in the quenching chamber 5 is higher than in the arc quenching zone 16a or that the decrease of the arc current in the vicinity of a zero current passage leads to a decrease in pressure in the arc quenching zone 16a.

Furthermore, the inlet channel 12 should be designed such that it is closed when the switch 1 is switched on, and is opened in a first phase when the switch 1 is interrupted, so that the hot gas can flow from the arc extinguishing zone 16a into the intermediate chamber 6. Preferably, means 18 for re-closing the inlet channel 12 in a second phase when interrupting the switch 1 and an outlet channel 13 for discharging the hot gas in an exhaust gas chamber 7 are present.

The above-described self-blowing switch 1 enables a more efficient extinguishing of the arc since the extinguishing gas is cold. Advantageously, the hot gas in the intermediate chamber 6 is not mixed with the cold gas in the quenching chamber 5, and / or the hot gas in the intermediate chamber 6 is not used to blow the arc 16.

The pressure buildup in the intermediate chamber 6 also supports the mechanical drive, which therefore has a small force to separate the contacts 2, 4a; 3, 4b of the switch 1 is required. High pressures are desirable in a self-blowing switch for extinguishing the arc 16. High pressures usually require relatively high temperatures of the extinguishing gas. At high temperatures, each but with self-blowing blades the extinguishing capacity and thus the switching capacity. The self-blow switch 1 described, however, allows the desired high pressure with cold extinguishing gas.

LIST OF REFERENCE NUMBERS

A Axis 1 switch, self-blower circuit breaker

2 first or outer arcing contact, arc contact tulip.

3 second or inner arcing contact, arcing contact pin 4a switch body, Nennstromkontakttulpe

4b switch body, rated current contact pin

5 extinguishing chamber

6 intermediate chamber, (self-blowing) pressure chamber

7 exhaust gas chambers 8 insulating nozzle; Main nozzle, auxiliary nozzle

9 partition (fixed)

9a axis-parallel partition wall part 9b paraxial partition wall part 9c radial partition wall part for connecting the paraxial parts

10 partition (movable), piston

11 extinguishing channel

12 inlet channel in intermediate chamber

13 Outflow channel in exhaust chamber 14 Valve

15 Interior, hollow contact volume, hot gas outflow area

16 arc

16a Arc extinguishing zone 17 Exhaust gas flow in intermediate chamber

18 housing part

19 exhaust gas flow in the exhaust gas chamber

Claims

1. Selbstblasschalter (1) with a first arcing contact (2) and a second arcing contact (3), wherein when the switch (1) of the first Arcing contact (2) with a contact region of the second arcing contact (3) is in contact, wherein for interrupting the switch (1) at least one of the arcing contacts (2, 3) along an axis (A) of the switch (1) is movable such that an arc extinguishing zone (16a) is formed between the arc contacts (2, 3), wherein a quenching chamber (5) is present, is stored in the cold gas and at least temporarily via a quenching channel (11) with the arc extinguishing zone (16a) is in communication, an intermediate chamber (6) is present, which communicates at least at times via an inlet channel (12) with the arc extinguishing zone (16a), wherein means (9, 9a, 9b, 9c, 10, 4b) for pressure communication between the intermediate chamber ( 6) and the quenching chamber (5) are present., Characterized in that in a switching operation - The extinguishing channel (11) in a first arc phase is closed so far that a heating of the cold gas in the quenching chamber (11) by rückströmendes Hot gas from the arc extinguishing zone (16a). is largely prevented in the quenching chamber (5), - the inlet channel (12) to the intermediate chamber (6) is opened so far that the hot gas from the arc-extinguishing zone (16a) can flow into the intermediate chamber (6) and the means (9, 9a, 9b, 9c, 10, 4b) cause with the help of the influx of hot gas into the intermediate chamber (6) compression of the cold gas in the quenching chamber (5) and - The extinguishing channel (11) is open in a second arc phase, so that the compressed cold gas for blowing an arc (16) between the arcing contacts (2, 3) can flow into the arc extinguishing zone (16a). 2. Selbstblasschalter (1) according to claim 1, characterized in that the extinguishing channel (11) is closed in the first arc phase, so that no hot gas from the arc extinguishing zone (16 a) in the quenching chamber (11) can flow. ^' 3. Selbstblasschalter (1) according to any one of the preceding claims, characterized in that in the second arc phase. the extinguishing channel (11) has an opening to the arc-extinguishing zone (16a). 4. Selbstblasschalter (1) according to any one of the preceding claims, characterized in that - The first arc phase is characterized by a high arc current and a strong gas heating in the arc (16), and - The second arc phase is characterized in that a back flow of hot gas from the arc extinguishing zone (16 a) in the quenching chamber (5) is prevented, in particular because the pressure in the quenching chamber (5) is higher than in the arc extinguishing zone (16 a) or because the decrease of the arc current in the vicinity of a zero current passage leads to a decrease in pressure in the arc extinguishing zone (16a). 5. Selbstblasschalter (1) according to one of the preceding claims, characterized in that the means (9, 9a, 9b, 9c, 10, 4b) are designed for the gas-tight separation of the quenching chamber (5) from the intermediate chamber (6). 6. Selbstblasschalter (1) according to any one of the preceding claims, characterized in that the intermediate chamber (6) from the quenching chamber (5) by a first partition wall (9c) is separated and between the first partition (9c) and a second partition ( 10) extends axially. 7. Selbstblasschalter (1) according to one of the preceding claims, characterized in that the means (9, 9a, 9b, 9c, 10, 4b) comprise a piston arrangement (9, 9a, 9b, 9c, 10, 4b) for simultaneously increasing the volume of the intermediate chamber (6) and reducing the volume of the quenching chamber (5). 8. Selbstblasschalter (1) according to claim 6 and 7, characterized in that the piston assembly (9-, 9a, 9b, 9c, 10, 4b), the first and second partition (9, 10) encompassed and - The first partition wall (9, 10) movable, in particular axially displaceable, is and / or - The second partition wall (9, 10) movable, in particular axially displaceable, and serves as a drive piston to a volume-reducing displacement of a wall of the quenching chamber (5). 9. Selbstblasschalter (1) according to one of the preceding claims, characterized in that the Intermediate chamber (6) is a Selbstblasdruckkammer (6), in which by Selbstblaseffekt in the switch (1), in particular on its insulating nozzle (8), a gas pressure can be generated. 10. A self-blowing switch (1) according to one of the preceding claims, characterized in that the inlet channel (12) to the intermediate chamber (6) via a Heißgasabströmbereich (15), ^' in particular via a hollow contact volume (15) in one of the arcing contacts (2, 3) is in communication with the arc extinguishing zone (16a). 11. Selbstblasschalter (1) according to any one of the preceding claims, characterized in that the inlet channel (12) is designed so that it is closed when switch is switched (1), and in a first phase when breaking the switch (1) is opened so that the hot gas from the arc extinguishing zone (16 a) in the intermediate chamber (6) can flow. 12. Selbstblasschalter (1) according to one of the preceding claims, characterized in that - means (18) for reclosing the inlet channel (12) in a second phase when interrupting the switch (1) are present, - An outlet channel (13) for discharging the hot gas in an exhaust chamber (7) is present, and - In particular that a valve (14) between the intermediate chamber (6) and the exhaust chamber (7) is present, the hot gas from a predetermined pressure from the intermediate chamber (6) into the exhaust chamber (7) can flow to the pressure in the intermediate chamber (6) limit to the specified pressure. 13. A method for switching electrical power in a self-blowing switch (1) having a first arcing contact (2) and a second arcing contact (3), wherein when the switch (1) is switched on, the first arcing contact (2) having a contact region of the second arcing contact (3) in which, in order to interrupt the switch (1), at least one of the arcing contacts (2, 3) is moved along an axis (A) of the switch (1) such that an arc extinguishing zone (16a) between the arcing contacts (2, 3) an extinguishing chamber (5) in which cold gas is stored is at least temporarily connected to the arc extinguishing zone (16a) via an extinguishing channel (11), an intermediate chamber (6) being present at least temporarily via an inlet channel (12 ) is connected to the arc extinguishing zone (16a), wherein the intermediate chamber (6) and the extinguishing chamber (5) are in pressure communication with each other, characterized in that at a S chaltvorgang - The extinguishing channel (11) in a first arc phase is closed so far that the hot gas at Return flow from the arc extinguishing zone (16a) into the extinguishing chamber ^¬ (5) is prevented and heating of the cold gas in the extinguishing chamber (11) is largely prevented, - The inlet channel (12) to the intermediate chamber (6) is opened so far that the hot gas from the arc extinguishing zone (16 a) can flow into the intermediate chamber (6), a volume of the intermediate chamber (5) is increased by a build-up of hot gas pressure in the intermediate chamber (6) and thereby a volume of the quenching chamber (5) is reduced and the cold gas in the quenching chamber (5) is compressed, and - The extinguishing channel (11) is opened in a second arc phase, so that the compressed cold gas is discharged into the arc extinguishing zone and the arc gas an arc (16) between the arcing contacts (2, 3) is blown. 14. The method according to claim 13, characterized in that - The hot gas in the intermediate chamber (6) is not mixed with the cold gas in the quenching chamber (5), and / or - The hot gas in the intermediate chamber (6) is not used for blowing the arc (16). 15. The method according to any one of claims 13-14, characterized in that the extinguishing channel (11) is closed in the first arc phase, so that no hot gas from the arc extinguishing zone (16a) in the quenching chamber (11) can flow. 16. The method according to any one of claims 13-15, ^• characterized in that - the inlet channel (12) when switched on Switch (1) is closed and is opened in a first phase when breaking the switch (1), so that the hot gas from the arc extinguishing zone (16a) in the intermediate chamber (6) can flow, and / or - the inlet channel (12) in A second phase when the breaker (1) is closed again and the hot gas can flow through an exhaust passage (13) in an exhaust gas chamber (7). 17. The method according to any one of claims 13-16, characterized in that - The hot gas pressure in the intermediate chamber (6) by Selbstblaseffekt in the switch (1), in particular at its insulating nozzle (8) is increased, and / or - An overpressure in the intermediate chamber (6) through a valve (14) to an exhaust chamber (7) is derived. 18. The method according to any one of claims 13-17, characterized in that the quenching channel (11) to the quenching chamber (5) opens into the arc extinguishing zone (16a) and the inlet channel (12) to the intermediate chamber (6) through a Heissgasabströmbereich (15), in particular by a hollow contact volume (15) in one of the arcing contacts (2, 3), from the arc extinguishing zone (16a) is spatially separated. 19. The method according to any one of claims 13-18, characterized in that - The first arc phase is characterized by a high arc current and a strong gas heating in the arc (16), and - The second arc phase is characterized in that a back flow of hot gas from the arc extinguishing zone (16a) in the quenching chamber (5) is prevented, in particular because the pressure in the quenching chamber (5) is higher than in the arc extinguishing zone (16a) or because the decrease of the arc current in the vicinity of a zero current passage leads to a decrease in pressure in the arc extinguishing zone (16a).