Double nozzle switch with outer contact, and method for switching the double nozzle switch

Abstract

The invention relates to a double nozzle switch (1) and to a method for switching high-voltage currents for a pole. The double nozzle switch (1) comprises at least one first contact (2) comprising at least one first and at least one second stationary contact piece (3, 4) and at least one first movable bridge contact piece (5), via which an electric contact is established between the at least one first and the at least one second stationary contact piece (3, 4) in the switched-on state. The double nozzle switch (1) additionally comprises at least one second contact (6) comprising at least one third and at least one fourth stationary contact piece (7, 8) and at least one second movable bridge contact piece (9), via which an electric contact is established between the at least one third and the at least one fourth stationary contact piece (7, 8) in the switched-on state. The at least one first and the at least one second contact (2, 6) are electrically connected in parallel.

Description

[0001] The invention relates to a double-nozzle switch and a method for switching high currents in high-voltage technology for one pole. The double-nozzle switch comprises at least one first contact, which includes at least one first and at least one second fixed contact piece, and at least one first movable bridging contact piece, via which, in the switched-on state, an electrical contact is established between the at least one first and the at least one second fixed contact piece.

[0002] A double-nozzle switch for high-voltage applications according to the prior art is known, for example, from EP 0 830 700 B1, JP S55 46426 A, EP 0 061 992 A2, and DE 22 11 617 A1. The double-nozzle switch comprises a rated current contact with two opposing, hollow cylindrical fixed contact pieces, each of which is nozzle-shaped. To switch on the switch, a hollow cylindrical bridging contact piece is slid over the two fixed contact pieces in such a way that an electrical contact is established between the fixed contact pieces via the bridging contact piece. To switch off the switch, the hollow cylindrical bridging contact piece is retracted by at least one fixed contact piece until a sufficient distance exists to reliably break the electrical contact.

[0003] The double-nozzle switch further comprises a compression device for extinguishing gas, in particular for SF6. The compression device has a stationary compression piston and a movable compression cylinder. The compression cylinder includes a base which is movably arranged with the compression cylinder and is moved when the switch is activated such that the two fixed contacts and the bridging contact are spatially enclosed by the compression cylinder. When the switch is deactivated, the compression cylinder and its base are moved such that the base is pulled away from at least one contact and retracted behind a gap between the fixed contacts, which is formed by the fixed distance between the fixed contacts. The base consists of and / or includes an insulator, e.g., Teflon and / or PCTFE.

[0004] An arc that can occur when switching between contacts is extinguished or blown out by the flow of extinguishing gas through the hollow cylindrical fixed contacts in the nozzle shape and by the compression device. In the switched-on state, the maximum possible current through the double-nozzle switch is limited, for example, by the material of the contacts, the conductive diameter of the contacts, and the electrical contact between the fixed contacts and the bridging contact. Increasing the maximum possible current at which the double-nozzle switch is not damaged by increasing the conductive diameter of the contacts leads to an increase in the moving mass, a larger size of the double-nozzle switch, and increased manufacturing costs. The use of highly conductive materials, such as silver coatings on contacts made of, for example, [material name], can be used to reduce the current.Using copper, steel, or aluminum to improve contacts significantly increases manufacturing costs. Spatial and financial limitations, as well as material properties such as electrical conductivity versus mass, restrict the maximum possible current through a dual-nozzle switch.

[0005] The object of the present invention is to provide a double-nozzle switch and a method for switching a double-nozzle switch, which enable high currents through the double-nozzle switch at high switching voltages and, in particular, at low manufacturing costs. In particular, it is an object to provide a double-nozzle switch which, compared to the prior art, has an increased maximum current-carrying capacity, low moving mass during switching, low manufacturing costs, compact dimensions, and a low extinguishing gas volume.

[0006] The stated problem is solved according to the invention by a double-nozzle switch for switching high currents in high-voltage technology for one pole, having the features of claim 1, and / or by a method for switching direct and / or alternating current in high-voltage technology, particularly using the double-nozzle switch described above, according to claim 8. Advantageous embodiments of the double-nozzle switch according to the invention for switching high currents in high-voltage technology for one pole, and / or of the method for switching direct and / or alternating current in high-voltage technology, particularly using the double-nozzle switch described above, are specified in the dependent claims. The subject matter of the main claims can be combined with each other and with features of the dependent claims, as well as with each other.

[0007] A double-nozzle switch according to the invention for switching high currents in high-voltage technology for one pole comprises at least one first contact, which includes at least one first and at least one second fixed contact piece, and at least one first movable bridging contact piece, via which an electrical contact is established between the at least one first and the at least one second fixed contact piece when the switch is on. The double-nozzle switch further comprises at least one second contact, with at least one third and at least one fourth fixed contact piece, and with at least one second movable bridging contact piece, via which an electrical contact is established between the at least one third and the at least one fourth fixed contact piece when the switch is on, wherein the at least one first and the at least one second contact are connected electrically in parallel.

[0008] The double-nozzle switch according to the invention, due to its two parallel-connected contacts, exhibits an increased maximum current-carrying capacity at low manufacturing costs. The double-nozzle switch has a low moving mass during switching and can be designed with compact dimensions and a low extinguishing gas volume.

[0009] In the switched-on state, the current flow through the second contact can be 20 to 90%, and in particular at least 50%, of the current flow through the first contact. The maximum current flow through the double-nozzle switch is increased by the corresponding amount compared to double-nozzle switches known from the prior art. Other designs of high-voltage circuit breakers, in particular with rated current and arc contacts, wherein at least one rated current contact and at least one arc contact are movable, and wherein the arc contacts are designed in pin and tulip shapes with low current-carrying capacity, as well as with an additional blow-out nozzle for extinguishing arcs, exhibit, compared to double-nozzle switches known from the prior art, only an increase in the maximum current flow of less than 20%, and in particular less than 10%, of the current flow through the tubular rated current contact, particularly due to the current flow through the arc contact.

[0010] The at least one first and at least one second fixed contact element of the double-nozzle switch according to the invention are hollow cylindrical, each designed in the form of a nozzle. The at least one first movable bridging contact element is hollow cylindrical, positively locking with an inner diameter that essentially corresponds to the outer diameter of the at least one first and / or the at least one second fixed contact element.

[0011] Hollow cylindrical contact pieces exhibit high current-carrying capacity at low mass, depending on the diameter and thickness of the hollow cylinder wall. Low contact piece mass combined with high current-carrying capacity reduces the mass that needs to be moved during switching. This enables rapid switching movements, i.e., short switching times, with low force, allowing for smaller dimensions of the kinematic chain and drive components, thus saving costs.

[0012] The at least one third and at least one fourth fixed contact element can be hollow cylindrical, in particular each in the form of a sliding contact guide. The at least one second, movable bridging contact element can be hollow cylindrical, in particular as a sliding contact, especially with a positive-locking outer diameter that essentially corresponds to the inner diameter of the at least one third and / or the at least one fourth fixed contact element. Sliding contact elements are simple and inexpensive to manufacture, exhibit high reliability in operation, are durable, and can be moved quickly. The advantages of designing the contact elements in the form of hollow cylinders are as described above.

[0013] A compression device may include a compression piston, in particular stationary or movable, and / or a compression cylinder, in particular movable, which has a base, in particular comprising an insulator.

[0014] The compression device can be arranged spatially, in a radial direction, between the at least one first and the at least one second contact, particularly when the double nozzle switch is switched on.

[0015] The compression device can be designed to extinguish an arc that may occur during switching. Designing the compression piston with an insulator at its base provides electrical isolation in the area of ​​the contacts between the first and second contacts, thus preventing arcs from forming across the base of the compression piston during switching.

[0016] Spatially, in a radial direction, the at least one first contact can be encompassed by the at least one second contact, particularly in the switched-on state of the double nozzle switch, especially with respective gas spaces associated with the contacts, which can be fluidically separated from each other in the switched-on state of the double nozzle switch.

[0017] The arrangement of the first contact inside the second contact, particularly the contact tube, results in a compact design. An arc can be effectively extinguished via fluidically separated gas chambers, e.g., by blowing with extinguishing gas, and arc jumping between the contacts can be prevented, especially between the inner and outer contact tubes.

[0018] The double-nozzle switch may include an electrically insulating fluid, in particular a liquid and / or a gas, especially SF6, nitrogen, dry air, carbon dioxide, a fluoroketone, and / or a fluoronitrile. The double-nozzle switch, in particular the contacts and / or the compression device, may be filled with the electrically insulating fluid, in particular a liquid and / or a gas, especially SF6, nitrogen, dry air, carbon dioxide, a fluoroketone, and / or a fluoronitrile. Electrically insulating fluids serve to insulate contacts from each other, especially when the double-nozzle switch is switched off, and are suitable for extinguishing arcs, in particular by blowing.

[0019] Nozzles can be coated with, and / or incorporate, abrasion-resistant material, in particular Teflon, and / or PCTFE, and / or graphite at the nozzle ends. This increases the dielectric strength of the double-nozzle switch in the off state and reduces the formation of arcs during switching, or facilitates arc extinguishing. Contact points of contacts can be coated with a highly conductive material, in particular silver, and / or have contact devices, in particular contact fingers. This enables high current-carrying capacity with low electrical losses via the contacts when the double-nozzle switch is on.

[0020] A method according to the invention for switching direct and / or alternating current in high-voltage technology, in particular using a previously described double-nozzle switch, comprises that, upon switching on, at least one first movable bridging contact element of at least one first contact is moved from a first position in electrical contact with a second, fixed contact element and without electrical contact with a first, fixed contact element, in particular with the first bridging contact element spatially encompassing the second contact element, to a second position, with electrical contact between the first and second contact elements via the first bridging contact element, in particular with the first bridging contact element spatially encompassing both the first and the second contact elements at least partially, and wherein at least one second,A movable bridging contact of at least one second contact is moved from a first position in electrical contact with a fourth, fixed contact and without electrical contact with a third, fixed contact, in particular with the fourth contact spatially encompassing the bridging contact at least partially, into a second position, with electrical contact between the third and fourth contact via the second bridging contact, in particular with the second bridging contact partially spatially encompassed by both the third and fourth contact.

[0021] When switching on, the first and second contacts can be closed simultaneously. Alternatively, when switching on, the first and second contacts can be closed sequentially, in particular in a sequence where the second contact closes later than the first.

[0022] When switched off, the at least one first movable bridging contact of the at least one first contact is moved from a second position, with electrical contact between the first and the second contact via the first bridging contact, to a first position with electrical contact of the first bridging contact with the second, fixed contact and without electrical contact with the first, fixed contact, and wherein the at least one second movable bridging contact of the at least one second contact is moved from a second position, with electrical contact between the third and fourth contact via the second bridging contact, to a first position, with electrical contact of the bridging contact with the fourth, fixed contact and without electrical contact with the third, fixed contact.

[0023] When switching off, the first and second contacts open simultaneously.

[0024] When the first contact closes, a movable compression cylinder can be moved with its base over the first, and in particular the first and second, contact points of the first contact, either simultaneously or subsequently, and before the second contact closes, especially to extinguish an arc between the first and second contact points. When the first contact opens, the movable compression cylinder can be moved with its base away from the first, and in particular the first and second, contact points of the first contact, either simultaneously or subsequently, and after the second contact has opened, especially to extinguish an arc between the first and second contact points.

[0025] The advantages of the inventive method for switching direct and / or alternating current in high-voltage technology, in particular using a previously described double-nozzle switch, according to claim 8, are analogous to the previously described advantages of the inventive double-nozzle switch for switching high currents in high-voltage technology for one pole according to claim 1 and vice versa.

[0026] In the following, an embodiment of the invention is schematically described in the Figures 1 and 2 illustrated and described in more detail below.

[0027] The following show Figure 1 schematically shows a sectional view of a double nozzle switch 1 according to the invention in the switched-on state, with two parallel-connected, closed contacts 2, 6, and Figure 2 schematically shows a sectional view of the double nozzle switch 1 of the Figure 1 , in the switched-off state, with two open contacts 2, 6.

[0028] In Figure 1A schematic sectional view of a double-nozzle switch 1 according to the invention is shown, with a first and a second contact 2, 6, in the closed, i.e., switched-on, state. The double-nozzle switch 1 is designed for switching high voltages, in particular DC and / or AC voltages up to 800 kV, and for switching currents in the range of up to 500 kA. The first contact 2 of the double-nozzle switch 1 has two fixed, hollow cylindrical contact pieces 3, 4 and a movable, first bridging contact piece 5. The two hollow cylindrical contact pieces 3, 4 are tubular in shape, with a common longitudinal axis. Two ends of the contact pieces 3, 4 are arranged opposite each other, with a gap between the ends, the size of which depends on the maximum voltage to be switched, for high dielectric strength in the off-state without voltage flashovers.The ends are coated with a burn-resistant material, e.g. Teflon or PCTFE, to minimize burn-off caused by arcing during switching.

[0029] The ends of the hollow cylindrical contact pieces 3, 4 are each designed in the form of a nozzle, i.e., with an inner cross-section that tapers towards the end. Arcs generated during switching can be effectively extinguished by quenching gas, in particular SF6, via the nozzles. The first and second contact pieces 3, 4 are each fixedly arranged or attached on the side opposite their ends, i.e., they are not movable within the double-nozzle switch 1. The contact pieces 3, 4 are mirror-symmetrical, with a symmetry axis perpendicular to the longitudinal axis of the hollow cylindrical contact pieces 3, 4, and have identical cross-sections, in particular identical outer cross-sections. The hollow cylindrical contact pieces can have a diameter of 50 to 200 mm, in particular 80 to 150 mm.The contact pieces 3, 4 are made of a highly conductive metal, in particular copper, aluminum, or steel. Contact surfaces with other contact pieces may be silver-plated and / or comprise carbon to ensure good electrical contact with low electrical losses across the contact.

[0030] The first bridging contact 5 is hollow cylindrical or tubular, with an inner diameter that essentially corresponds to the outer diameter of the first and second contact pieces 3, 4. The first bridging contact 5 and the first and second contact pieces 3, 4 share a common longitudinal axis. The first bridging contact 5 is movably arranged along this longitudinal axis. In the switched-on state, the first bridging contact 5 is pulled over or encompasses the ends of the contact pieces 3, 4. At one end, the first bridging contact 5 is connected via elements of a kinematic chain to a drive, which is not shown in the figures for the sake of simplicity. A switching movement is transmitted to the first bridging contact 5 via the drive and elements of the kinematic chain during switching.

[0031] At one end of the first bridging contact piece 5, which is opposite the end with elements of the kinematic chain, contact elements, e.g. in the form of contact fingers, can be arranged to ensure good electrical contact between the first bridging contact piece 5 and the first contact piece 3 of the first contact 2. In the area of ​​the second contact piece 4 of the first contact 2 when switched on, contact elements, e.g. in the form of contact fingers, springs and / or sliding rings, can also be arranged on the first bridging contact piece 5 to ensure good electrical contact between the first bridging contact piece 5 and the second contact piece 4 of the first contact 2.

[0032] In the switched-on state, a compression device 10 for extinguishing gas, in particular SF6 or dry air, is arranged around contact 2. The compression device 10 comprises a stationary compression piston 11 and a movable compression cylinder 12. The compression piston 11 is arranged rotationally symmetrically around the second contact piece 4, between the second contact piece 4 and the compression cylinder 12. The compression cylinder 12 includes a base 13 at the end facing the first contact piece 3. The base 13 is rigidly connected to the compression cylinder 12 and, in particular, forms a fluid-tight seal with the first contact piece 3. The base 13 is movably arranged with the compression cylinder 12 along its longitudinal axis. The base is made of a particularly flame-resistant, electrically insulating material, e.g., Teflon or PCTFE.

[0033] In the switched-on state, a second contact 6 spatially encompasses the first contact 2 and the compression device 10. Analogous to the first contact 2, the second contact 6 has two fixed contact pieces 7, 8, i.e., a third and a fourth spatially fixed contact piece 7, 8, as well as a second movable bridging contact piece 9.

[0034] The third contact piece 7 and the fourth contact piece 8 are tubular and hollow cylindrical, respectively, and, analogous to the first and second contact pieces 3 and 4, are mirror-symmetrical along a symmetry axis perpendicular to the common longitudinal axis of the contact pieces 7 and 8. The contact pieces 7 and 8 are arranged with one end opposite the other and are fixed in place within the double-nozzle switch 1 at their respective other ends, in particular the tubular end. The first contact piece 3 is arranged centrally inside the tubular third contact piece 7, in the radial direction. The second contact piece 4 is arranged centrally inside the tubular fourth contact piece 8, also in the radial direction.

[0035] The second bridging contact piece 9 is hollow cylindrical or tubular in shape with an outer diameter that is essentially equal to the inner diameter of the contact pieces 7, 8 of the second contact 6. The second bridging contact piece 9 is movably arranged, in particular as a sliding contact, within the contact pieces 7, 8 of the second contact 6. In the switched-on state of the double nozzle switch 1, as shown in Figure 1As shown, the second bridging contact 9 connects the gap between the third contact 7 and the fourth contact 8, thereby electrically closing the second contact 6. During switching, the movable second bridging contact 9 slides within the fourth contact 8 and, in the switched-on state, projects with one end into the third contact 7 in a form-fitting manner. Contact devices such as contact fingers, sliding rings, and / or springs can be arranged to ensure good electrical contact between the second bridging contact 9 and the third contact 7 and / or between the second bridging contact 9 and the fourth contact 8, particularly in the switched-on state, and to ensure good electrical contact between the contacts 7, 8, and 9.

[0036] The compression device 10 is arranged radially between the first and second contacts 2, 6. The second bridging contact piece 9 can be positively connected to the movable compression cylinder 12 and moved via elements of the kinematic chain during switching, or, as a movable contact piece 9, be directly connected to elements of the kinematic chain for movement during switching. The contact pieces 3, 4, 5, 7, 8, 9 are made of a highly conductive material, e.g., copper, aluminum, or steel.

[0037] In Figure 2 Is the double nozzle switch 1 of the Figure 1 Schematically shown in a sectional view in the off state, with two open contacts 2, 6. In contrast to the on state, as shown in Figure 1 The image shows the position of the double nozzle switch 1 in the off state, as shown in Figure 2As shown, the first contact 2 and the second contact 6 are electrically and / or mechanically interrupted. The first bridging contact 5 and the second bridging contact 9, as well as the compression device 10 with movable compression cylinder 12 and the base 13 of the compression cylinder 12, are arranged away from the first contact 3 and third contact 7, in particular completely around the second contact 4, on the side of the double nozzle switch 1 where the fourth contact 8 is located.

[0038] When the device is switched on, the first contact 2 is closed by moving the first bridging contact 5 from the second contact 4 to the first contact 3 until an electrical contact exists between the contacts 3, 4, 5, and especially between contacts 3 and 5. The hollow cylindrical contacts 3, 4, 5 form a closed tube in the area of ​​the first contact 2. Simultaneously or with a time delay, especially before the first bridging contact 5, the compression cylinder 12 with base 13 is pulled or pushed over the first contact 3 by the first bridging contact 5, i.e., moved, and quenching gas flows through the hollow cylindrical first and second nozzle-shaped contacts as well as through the first bridging contact 5.An arc that may occur during switching between the first bridging contact 5 and the first contact 3, particularly within a closed tube, can be extinguished by a gas flow. Upon switching on, extinguishing gas flows via the stationary compression piston 11 into the compression device 10, and thus via the first bridging contact 5 and the first contact 3 in the compression cylinder 12 with base 13. An arc that may occur during switching between the first bridging contact 5 and the first contact 3 outside the closed tube is extinguished by the extinguishing gas flow.

[0039] Simultaneously with or after the closing of the first contact 2, the second contact 6 is closed. The second bridging contact 9 is moved, in particular from the fourth contact 8, towards the third contact 7 until an electrical and, in particular, also mechanical contact exists between the bridging contact 9 and the third contact 7; in particular, the bridging contact 9 is inserted into the third contact. The contacts 2, 6 are closed, and the current flows through the first and second contacts 2, 6. The double nozzle switch 1 is switched on, as shown in Figure 1 as shown, and a high maximum current flow across both contacts 2, 6 in the range of, in particular, 500 kA is possible.

[0040] When the power is switched off, the first contact 2 is opened by moving the first bridging contact 5 away from the first contact 3 and towards the second contact 4 until an electrical contact between the contacts 3, 4, and 5, particularly between contacts 3 and 5, is reliably broken. The distance between contacts 4 and 5 and contact 3 depends on the maximum applied voltage and prevents electrical arcing. A gap, filled with quenching gas, is created between contacts 4 and 5 and contact 3. Simultaneously or sequentially, particularly after the first bridging contact 5, the compression cylinder 12 with base 13 is pulled or pushed away from the first contact 3 by the first bridging contact 5, allowing quenching gas to flow through the hollow cylindrical first and / or second nozzle-shaped contact.An arc that may occur during switching between the first bridging contact 5 and the first contact 3 is extinguished by the quenching gas flow. Furthermore, an arc can be wiped off by the base 13 from the first contact 3 towards the second contact 4 as it moves away from the first contact 3 and towards the second contact 4.

[0041] Before or simultaneously with the opening of the first contact 2, the second contact 6 is opened. The second bridging contact 9 is moved, in particular, from the third contact 7 towards and, in particular, into the fourth contact 8, until there is no longer any electrical and, in particular, no mechanical contact between the bridging contact 9 and the third contact 7; in particular, the bridging contact 9 is inserted into the fourth contact 8. The contacts 2, 6 are open, and the current flow through the first and second contacts 2, 6, i.e., the double-nozzle switch 1, is interrupted. The double-nozzle switch 1 is switched off, as shown in Figure 2 as shown, and a high voltage resistance of the separated state of the two contacts 2, 6 in the range of especially up to 800 kV is possible.

[0042] The embodiments described above can be combined with each other and / or with the prior art. The double nozzle switch 1 of the Figures 1 and 2is designed for switching one pole. In a three-pole configuration, for example, three double-nozzle switches 1 according to the invention are used, arranged side by side. To further increase the maximum possible current, two or more double-nozzle switches 1 can be connected in parallel for one pole. To increase the dielectric strength in the off state, two or more double-nozzle switches 1 can be connected in series for one pole. For insulating elements, such as the base 13, other materials such as plastics can be used in addition to or as an alternative to Teflon and / or PCTFE. Graphite or other materials can serve as burn-resistant materials, for example, at the ends of the contact pieces 3, 4. The contact pieces 3, 4, 5, 7, 8, 9 can be made in one piece or from several pieces. In particular, contact and / or sliding devices such as, for example,The contact fingers, metal or Teflon rings, or coatings of the contact pieces 3, 4, 5, 7, 8, 9 and / or the compression device 10 may be included. Different movement and / or switching sequences are possible, particularly with regard to the movement of the bridging contact pieces 5 and 9 and the compression cylinder 12 with base 13. Elements of the double nozzle switch 1 can also be moved independently of one another, particularly via gear elements, either sequentially or simultaneously. Reference symbol list

[0043] 1 Double nozzle switch 2 First contact 3 First fixed contact 4 Second fixed contact 5 First bridging contact 6 Second contact 7 Third fixed contact 8 Fourth fixed contact 9 Second bridging contact 10 Compression device 11 Stationary compression piston 12 Movable compression cylinder 13 Bottom of compression cylinder, insulator

Claims

1. A double-nozzle switch (1) for switching high currents in high voltage technology for a pole, with at least one first contact (2), which comprises at least one first and at least one second fixed contact piece (3, 4), with two ends opposite to one another, and at least one first movable bridging contact piece (5) via which, in the switched-on state, an electrical contact is established between the at least one first and the at least one second fixed contact piece (3, 4), wherein at least one second contact (6) is comprised, with at least one third and with at least one fourth fixed contact piece (7, 8) as well as with at least one second movable bridging contact piece (9), via which, in the switched-on state, an electrical contact is established between the at least one third and the at least one fourth fixed contact piece (7, 8), wherein the at least one first and the at least one second contact (2, 6) are electrically connected in parallel, wherein the at least one first and the at least one second fixed contact piece (3, 4) are configured in the shape of a hollow cylinder, in form of a nozzle, with inner cross sections that taper toward the ends, and that the at least one first movable bridging contact piece (5) is configured in the shape of a hollow cylinder, in form-fit, with an inner diameter which substantially corresponds to the outer diameter of the at least one first and the at least one second fixed contact piece (3, 4), and wherein the double nozzle switch (1) is configured so that, upon switching off, the at least one first movable bridging contact piece (5) of the at least one first contact (2) is moved from a second position with electrical contact between the first and second contact pieces (3, 4) via the first bridging contact piece (5) into a first position with electrical contact of the first bridging contact piece (5) with the second fixed contact piece (4) and without electrical contact with the first fixed contact piece (3), and wherein the at least one second movable bridging contact piece (9) of the at least one second contact (6) is moved from a second position with electrical contact between the third and fourth contact pieces (7, 8) via the second bridging contact piece (9) into a first position with electrical contact of the bridging contact piece (9) with the fourth fixed contact piece (8) and without electrical contact with the third fixed contact piece (7), characterized in that upon switching off, the first and second contacts (2, 6) are opened simultaneously.

2. The double-nozzle switch (1) according to claim 1, characterized in that the at least one third and the at least one fourth fixed contact piece (7, 8) are configured in the shape of a hollow cylinder, each in form of a sliding contact guide, and that the at least one second movable bridging contact piece (9) is configured in the shape of a hollow cylinder, as a sliding contact, in form-fit, with an outer diameter which substantially corresponds to the inner diameter of the at least one third and the at least one fourth fixed contact piece (7, 8).

3. The double-nozzle switch (1) according to any one of the preceding claims, characterized in that a compression device (10) with a stationary or movable compression piston (11) and with a movable compression cylinder (12) having a bottom (13) comprising an insulator is comprised.

4. The double-nozzle switch (1) according to claim 3, characterized in that the compression device (10) is spatially arranged in a radial direction between the at least one first and the at least one second contact (2, 6) in the switched-on state of the double-nozzle switch (1).

5. The double-nozzle switch (1) according to any one of the preceding claims, characterized in that the at least one first contact (2) is, spatially in a radial direction, comprised by the at least one second contact (6) in the switched-on state of the double-nozzle switch (1), with respective gas spaces that are associated with the contacts (2, 6), which are fluidically separated from each other in the switched-on state of the double-nozzle switch (1).

6. The double-nozzle switch (1) according to any one of the preceding claims, characterized in that an electrically insulating fluid is comprised, a liquid or a gas, SF6, nitrogen, dry air, carbon dioxide, a fluoroketone, or a fluoronitrile, and that the double nozzle switch (1), the contacts (2, 3) and the compression device (10) are filled with the electrically insulating fluid.

7. The double-nozzle switch (1) according to any one of the preceding claims, characterized in that nozzles are coated with burn-up-resistant material, Teflon, or PCTFE, or graphite at the nozzle ends, or comprise Teflon, or PCTFE, or graphite at the nozzle ends, and that contact points of contact pieces are coated with highly conductive material and have contact features, in particular contact fingers.

8. A method for switching direct and / or alternating current in high voltage technology, using a double-nozzle switch (1) according to any one of the preceding claims, wherein upon switching on, at least one first movable bridging contact piece (5) of at least one first contact (2) is moved from a first position in electrical contact with a second fixed contact piece (4) and without electrical contact with a first fixed contact piece (3), with the first bridging contact piece (5) spatially comprising the second contact piece (4), into a second position with electrical contact between the first and second contact pieces (3, 4) via the first bridging contact piece (5), with the first bridging contact piece (5) spatially at least partially comprising both the first and second contact pieces (3, 4), and wherein at least one second movable bridging contact piece (9) of at least one second contact (6) is moved from a first position in electrical contact with a fourth fixed contact piece (8) and without electrical contact with a third fixed contact piece (7), with the fourth contact piece (8) spatially at least partially comprising the bridging contact piece (9) into a second position with electrical contact between the third and fourth contact pieces (7, 8) via the second bridging contact piece (9), with the second bridging contact piece (9) being partially spatially comprised by both the third and fourth contact pieces (7, 8) respectively,.

9. The method according to claim 8, characterized in that upon switching on, the first and second contacts (2, 6) are closed simultaneously.

10. The method according to claim 8, characterized in that upon switching on, the first and second contacts (2, 6) are closed successively, in particular with an order in which the second contact (6) is closed temporally later than the first contact (2).

11. The method according to any one of claims 8 to 10, characterized in that upon closing the first contact (2), simultaneously or subsequently, and before closing the second contact (6), a movable compression cylinder (12) is moved with its bottom (13) over the first, in particular the first and second contact pieces (3, 4) of the first contact (2), for blowing an electric arc between the first and second contact pieces (3, 4), and / or that upon opening the first contact (2), simultaneously or subsequently, and after opening the second contact (6), the movable compression cylinder (12) is moved with its bottom (13) away from the first, in particular from the first and second contact pieces (3, 4) of the first contact (2), for quenching an electric arc between the first and second contact pieces (3, 4).

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