Medium voltage switchgear

Abstract

Embodiments of the present disclosure relate to a medium voltage switchgear comprising one or more electrodes and for each electrode: a first electrode terminal, a second electrode terminal and a ground terminal; a fixed contact assembly comprising a plurality of fixed contact members spaced apart from each other; a movable contact assembly rotatable about a rotation axis between a first end of travel position corresponding to a closed state of the switchgear and a second end of travel position corresponding to a grounded state of the switchgear; the movable contact assembly passing through an intermediate position corresponding to an open state of the switchgear when moving between the first and second end of travel positions. The movable contact assembly is arranged such that the electrical contacts within the vacuum chamber of the movable contact assembly are coupled to each other when the switchgear is in the open state.

Description

Technical Field

[0001] This invention relates to a switching device for medium-voltage power systems, and more specifically to a load circuit breaker for medium-voltage power systems. Background Technology

[0002] Load circuit breakers are well known in the prior art.

[0003] These switching devices are typically used in secondary distribution networks and are capable of providing circuit breaking (i.e., breaking and generating current) and circuit disconnection (i.e., the grounded load side portion of the power circuit) under specified circuit conditions (typically nominal conditions for breaking current and nominal conditions for making current or fault conditions).

[0004] Most conventional load circuit breakers in the prior art have their electrodes immersed in a sulfur hexafluoride (SF6) atmosphere because this insulating gas ensures excellent performance in terms of dielectric insulation between live parts and arc extinguishing capability in the event of current interruption.

[0005] However, SF6 is a well-known potent greenhouse gas, and its use is subject to strict constraints for environmental protection purposes. For this reason, considerable effort has been made over the years to develop and design load circuit breakers that do not use SF6 as an insulating gas.

[0006] Several load-breaking switches have been developed in which electrodes are immersed in pressurized dry air or environmentally friendly insulating gases, such as mixtures of oxygen, nitrogen, carbon dioxide, and / or fluorinated gases. Unfortunately, experience has shown that these switching devices generally do not exhibit completely satisfactory performance, particularly in terms of arc-extinguishing capability and dielectric insulation.

[0007] Additionally, they typically employ complex solutions to operate their electrical contact arrangements, and they still perform poorly in terms of structural compactness and operational reliability. Summary of the Invention

[0008] The main objective of this invention is to provide a switching device for medium-voltage power systems that allows for the resolution or mitigation of the aforementioned technical problems.

[0009] More specifically, one object of the present invention is to provide a switching device that ensures a high level of performance in terms of dielectric insulation and arc extinguishing capability during current interruption.

[0010] Another object of the present invention is to provide a switching device that exhibits a high level of reliability during operation.

[0011] Another object of the present invention is to provide a switching device with electrodes that are highly compact and have a simple structure.

[0012] Another object of the present invention is to provide a switching device that can be easily manufactured at the industrial level and is cost-competitive with prior art solutions.

[0013] To achieve these objectives and purposes, the present invention provides a switching device according to claim 1 and related dependent claims.

[0014] In a general definition, the switching device of the present invention includes one or more electrodes.

[0015] For each electrode, the switching device includes a first electrode terminal, a second electrode terminal, and a ground terminal. In operation, the first electrode terminal can be electrically coupled to a first conductor of the wire, the second electrode terminal can be electrically coupled to a second conductor of the wire, and the ground terminal can be electrically coupled to a ground conductor.

[0016] For each electrode, the switching device includes a fixed contact assembly comprising a plurality of fixed contact members spaced apart from each other. Specifically, the fixed contact assembly includes a first fixed contact member electrically connected to a first electrode terminal, a second fixed contact member and a third fixed contact member electrically connected to a second electrode terminal, and a fourth fixed contact member electrically connected to a ground terminal.

[0017] For each electrode, the switching device includes a movable contact assembly rotatable about a rotation axis. The movable contact assembly includes:

[0018] - The first main contact member can be coupled to the first fixed contact member or the fourth fixed contact member when the movable contact assembly rotates about the rotation axis;

[0019] - The second main contact component can be coupled to the second fixed contact component or the third fixed contact component when the movable contact assembly rotates about the rotation axis;

[0020] - A vacuum chamber and an arc contact component pair, which are housed within the vacuum chamber and can be coupled or decoupled from each other. Each arc contact component is connected in series to a corresponding main contact component.

[0021] The movable contact assembly is reversibly movable about the rotation axis in a first operating end position corresponding to the closed state of the switching device, a second operating end position corresponding to the grounded state of the switching device, and an intermediate position corresponding to the open state of the switching device.

[0022] According to the present invention, when the movable contact assembly is in the intermediate position, the first main contact member is decoupled from the first fixed contact member and the fourth fixed contact member, the second main contact member is decoupled from the second fixed contact member and the third fixed contact member, and the arc contact members are coupled to each other.

[0023] Conveniently, when the movable contact assembly is in the first end-of-operation position, the first main contact member is coupled to the first fixed contact member, the second main contact member is coupled to the second fixed contact member, and the arc contact members are coupled to each other.

[0024] Conveniently, when the movable contact assembly is in the second end-of-operation position, the first main contact member is coupled to the fourth fixed contact member, the second main contact member is coupled to the third fixed contact member, and the arc contact members are coupled to each other.

[0025] According to one aspect of the invention, the aforementioned arc contact member includes a fixed arc contact member and a movable arc contact member. The movable arc contact member can be coupled or decoupled from the fixed arc contact member by moving along a translation axis perpendicular to the rotation axis.

[0026] According to one aspect of the invention, for each electrode, the switching device includes at least one track member and at least one drive member, the at least one track member having a track surface with a cam profile, and the at least one drive member being firmly coupled to a movable arc contact member.

[0027] As the movable contact assembly rotates about the rotation axis, each drive member is adapted to slide along the track surface of the corresponding track member.

[0028] As the movable arc contact member slides along the track surface, each drive member actuates the movable arc contact member along a translation axis perpendicular to the rotation axis between a coupled position with the fixed arc contact member and a decoupled position with the fixed arc contact member.

[0029] When the movable contact assembly is in the first end-of-run position, each drive member is in a first position along the track surface.

[0030] When the movable contact assembly is in the intermediate position, the drive member is in the second position along the track surface.

[0031] When the movable contact assembly is in the second end-of-operation position, the drive member is in the third position along the track surface.

[0032] Conveniently, the second position is located between the first position and the third position.

[0033] When moving between the first and second positions, each drive member slides along a portion of a first track surface having a cam profile; and when moving between the second and third positions, each drive member slides along a portion of a second track surface having a cam profile.

[0034] When the drive member is located at the first position, the second position, or the third position along the track surface, each drive member actuates the movable arc contact member to a coupled position with the fixed arc contact member.

[0035] When sliding along the first or second track surface portion, each drive member actuates the movable arc contact member along the translation axis between a coupled position with the fixed arc contact member and a decoupled position with the fixed arc contact member.

[0036] According to one aspect of the invention, each movable contact assembly includes a cam mechanism coupled to a movable arc contact member.

[0037] The cam mechanism is adapted to press the movable arc contact member against the fixed arc contact member when the movable arc contact member is coupled to the fixed arc contact member and the movable contact assembly is in the first end-of-operation position or the second end-of-operation position.

[0038] Preferably, the cam mechanism includes:

[0039] - The pushing member is movable relative to the movable arc contact member along the translation axis;

[0040] - A spring member, arranged along the translation axis and coupled to a push member and a movable arc contact member.

[0041] According to some embodiments of the present invention, the cam mechanism includes a slider member coupled to a push member and capable of being coupled to one or more first cam surfaces or one or more second cam surfaces when the movable contact assembly is in a first end-of-operation position or a second end-of-operation position. When the slider member is coupled to the one or more first cam surfaces or the one or more second cam surfaces, the slider member applies an actuating force to the push member, which is directed to compress the spring member and subsequently press the movable arc contact member against the fixed arc contact member.

[0042] According to other embodiments of the invention, the cam mechanism includes a lever member having a cam profile and being coupled to the push member and one or more first sliding surfaces or one or more second sliding surfaces when the movable contact assembly is in the first end-of-run position or the second end-of-run position.

[0043] When the lever member is coupled to one or more first sliding surfaces or one or more second sliding surfaces, the lever member applies an actuating force to the push member, which causes the spring member to be compressed and subsequently presses the movable arc contact member against the fixed arc contact member. Attached Figure Description

[0044] Other features and advantages of the invention will become apparent from the description of preferred, but not exclusive, embodiments of the switching device according to the invention, of which non-limiting examples are provided in the accompanying drawings, wherein...

[0045] - Figure 1 This is a schematic diagram of the switching device according to the present invention;

[0046] - Figures 2 to 4 This is a schematic diagram showing a partial embodiment of the switching device according to the present invention;

[0047] - Figures 5 to 7 This is a schematic diagram showing a partial embodiment of a switching device according to the present invention;

[0048] - Figures 8 to 16 It's a diagram. Figures 5 to 6 A schematic diagram of the operation of the switching device. Detailed Implementation

[0049] Referring to the accompanying drawings, the present invention relates to a switching device 1 for a medium-voltage power system.

[0050] For the purposes of this application, the term "medium voltage" (MV) refers to the operating voltage of a distribution level that is higher than 1 kV AC and 1.5 kV DC, up to tens of kV, for example, up to 72 kV AC and 100 kV DC.

[0051] Switching device 1 is particularly suitable for operation as a load circuit breaker. Therefore, it is designed to provide circuit breaking function under specific circuit conditions (typically nominal conditions for generating current and nominal or fault conditions for generating current) and circuit disconnection function, especially grounding the load side portion of the circuit.

[0052] The switching device 1 includes one or more electrodes 2.

[0053] Preferably, the switching device 1 is of the multiphase (e.g., three-phase) type, and it includes multiple (e.g., three) electrodes 2.

[0054] Preferably, the switching device 1 includes an insulating housing 4 that conveniently defines the internal volume in which the electrode 2 is housed.

[0055] Preferably, the insulating housing 4 has a longitudinal axis A1 ( Figure 1 The electrodes are developed into an elongated shape (e.g., generally cylindrical or parallelepiped). The electrodes 2 are arranged side by side along the longitudinal axis A1 in a corresponding transverse plane perpendicular to the longitudinal axis.

[0056] Generally, the insulating housing 4 of the switching device can be implemented according to known types of solutions. Therefore, for the sake of brevity, only aspects of interest of the present invention will be described below.

[0057] Conveniently, the internal volume of the switching device 1 is filled with pressurized dry air or other insulating gases with low environmental impact, such as a mixture of oxygen, nitrogen, carbon dioxide and / or fluorinated gases.

[0058] For each electrode 2, the switching device 1 includes a first electrode terminal 11, a second electrode terminal 12, and a ground terminal 13.

[0059] The first electrode terminal 11 is adapted to be electrically coupled to a first conductor of the wire (e.g., electrically connected to a phase conductor of an equivalent power source), the second electrode terminal 12 is adapted to be electrically connected to a second conductor of the wire (e.g., electrically connected to a phase conductor of an equivalent electrical load), and the ground terminal 13 is adapted to be electrically connected to a ground conductor.

[0060] Generally, the terminals 11, 12, and 13 of each electrode 2 of the switching device can be implemented according to known schemes. Therefore, for the sake of brevity, they will only be described below with respect to the various aspects of interest of the present invention.

[0061] According to the present invention, for each electrode 2, the switching device 1 includes a fixed contact assembly, which includes a plurality of fixed contact members 5, 6, 7, and 8 spaced apart from each other.

[0062] The aforementioned fixed contact assembly includes a first fixed contact member 5, a second fixed contact member 6, a third fixed contact member 7, and a fourth fixed contact member 8, which are circumferentially spaced around the longitudinal axis A1.

[0063] Each fixed contact component 5, 6, 7, 8 is at least partially made of conductive material.

[0064] As shown in the cited figure ( Figure 2 and Figure 5As shown, each fixed contact component 5, 6, 7, 8 is preferably formed from a conductive material molded part having a pair of parallel blades, which includes a suitable free contact surface having other electrical contacts.

[0065] However, in principle, each fixed contact component 5, 6, 7, 8 can be implemented according to other schemes of known types (e.g., according to a single-blade configuration). For the sake of brevity, other schemes of known types will not be described in detail in this paper.

[0066] For each electrode 2, the first fixed contact member 5 and the second fixed contact member 6 are housed on opposite sides of the insulating housing 4 about the longitudinal axis A1 within the internal volume of the switching device. Specifically, the lower and upper walls of the insulating housing 4 (referencing the normal installation position of the switching device, such as...) Figure 1 (as shown) at the location.

[0067] Preferably, the fixed contact components 5 and 6 are aligned along the first reference plane that is perpendicular to the upper and lower walls of the insulating housing 4 and passes through the longitudinal axis A1.

[0068] The first fixed contact member 5 is electrically connected to the first electrode terminal 11, and the second fixed contact member 6 is electrically connected to the second electrode terminal 12. Therefore, the fixed contact members 5 and 6 include suitable connection portions for electrical connection to the corresponding electrode terminals 11 and 12.

[0069] For each electrode 2, the third fixed contact member 7 and the fourth fixed contact member 8 are housed on opposite sides of the insulating housing 4 about the longitudinal axis A1 within the internal volume of the switching device. Specifically, the opposite sidewalls of the insulating housing (referencing the normal mounting position of the switching device, such as...) Figure 1 (as shown) at the location.

[0070] Preferably, the fixed contact members 7 and 8 are aligned along a second reference plane that is perpendicular to the sidewall of the insulating housing 4 and passes through the longitudinal axis A1.

[0071] The third fixed contact member 7 is electrically connected to the second fixed contact member 6 (and thus connected to the second electrode terminal 12) by a suitable conductive member 67, which is formed, for example, by a conductive material molding (as shown in the referenced figure) or a cable.

[0072] The fourth fixed contact member 8 is electrically connected to the grounding terminal 13. For this purpose, the fixed contact member 8 includes a suitable connection portion for electrical connection with the grounding terminal.

[0073] According to the present invention, for each electrode 2, the switching device 1 includes a movable contact assembly 10, which includes a plurality of contact members 15, 16, 17, and 18.

[0074] The movable contact assembly 10 rotates as a whole around a suitable rotation axis A1 (which is preferably the main longitudinal axis of the switching device) along a given rotation plane perpendicular to the rotation axis.

[0075] The movable contact assembly 10 can rotate according to a first rotation direction R1 or a second rotation direction R2 that is opposite to the first rotation direction R1.

[0076] refer to Figures 8 to 16 On the observation plane, the first rotation direction R1 is counterclockwise, while the second rotation direction R2 is clockwise.

[0077] As will be better explained below, the movable contact assembly 10 moves in a first rotation direction R1 during the disconnection or opening action of the switching device, and moves in a second rotation direction R2 during the closing or reconnection action of the switching device.

[0078] Preferably, the switching device 1 includes a motion transmission shaft 3 made of electrically insulating material, which can rotate about a rotation axis A1.

[0079] Preferably, the switching device 1 includes an actuation component 30 that provides a suitable actuating force to actuate a movable part of the switching device.

[0080] The motion drive shaft 3 is conveniently coupled to the movable actuator assembly 30 and the movable contact assembly 10 of each electrode.

[0081] Therefore, the motion drive shaft 3 transmits rotational mechanical force to move the movable contact assembly 10 of each electrode about the rotation axis A1 during the operation of the switching device.

[0082] Preferably, the actuation assembly 30 includes an actuator 30A, which is coupled to the drive shaft 3 via a suitable kinematic chain 30B. The actuator 30A may be, for example, a mechanical actuator, an electric motor, or an electromagnetic actuator.

[0083] Typically, the actuation component 30 of the switching device can be implemented according to known types of solutions. Therefore, for the sake of brevity, only aspects of interest of the present invention will be described below.

[0084] Preferably, the movable contact assembly 10 of each electrode includes a main support shell 9, which is preferably arranged at the center of the rotation axis A1.

[0085] Preferably, the support cover 9 is conveniently made of an electrically insulating material.

[0086] Preferably, the support shell 9 has an elongated shape (e.g., generally cylindrical or parallelepiped) extending along a corresponding longitudinal axis A2 perpendicular to the axis of rotation A1.

[0087] Preferably, the support housing 9 is securely coupled to the motion transmission shaft 3 in such a way that it rotates together with the motion transmission shaft 3 about the rotation axis A1.

[0088] More preferably, as shown in the cited figure ( Figure 2 and Figure 5 As shown in the figure, the support shell 9 and the motion transmission shaft 3 are made as one piece.

[0089] According to the present invention, the movable contact assembly 10 of each electrode includes a first main contact member 15 and a second main contact member 16 adapted to rotate about a rotation axis A1.

[0090] Preferably, the first main contact member 15 and the second main contact member protrude from opposite sides of the supporting casing 9, facing the opposite walls where the first fixed contact member 5 and the fourth fixed contact member 8, as well as the second fixed contact member 6 and the third fixed contact member 7, are located respectively.

[0091] Preferably, the main contact components 15 and 16 are aligned along the longitudinal axis A2.

[0092] The main contact components 15 and 16 are securely coupled to the support housing 9 so that they can rotate together with the latter about the axis of rotation A1.

[0093] Each main contact member 15, 16 of the movable contact assembly 10 is at least partially made of a conductive material.

[0094] As shown in the cited figure ( Figure 2 and Figure 5 As shown, each main contact component 15, 16 is preferably formed of a conductive material molding that includes a pair of parallel blades having a suitable free contact surface with other electrical contacts.

[0095] However, in principle, each main contact component 15, 16 can be implemented according to other schemes of known types (e.g., according to a single-blade configuration), and for the sake of brevity, these other schemes of known types will not be described in detail here.

[0096] During operation, when the movable contact assembly 10 rotates around the rotation axis A1, the first main contact member 15 can be coupled or decoupled from the first fixed contact member 5, or it can be coupled or decoupled from the fourth fixed contact member 8. At the same time, the second main contact member 16 can be coupled or decoupled from the second fixed contact member 6, or it can be coupled or decoupled from the third fixed contact member 7.

[0097] According to the present invention, the movable contact assembly 10 of each electrode includes a vacuum chamber 14 and an arc contact member pair, which is housed in the vacuum chamber and is capable of coupling or decoupling from each other.

[0098] According to the preferred embodiment of the invention shown in the accompanying drawings, such an arc contact member includes a fixed arc contact member 17 and a movable arc contact member 18.

[0099] Preferably, the fixed arc contact member 17 is electrically connected to the first main contact member 15, while the movable arc contact member 18 is electrically connected to the second main contact member 16.

[0100] Preferably, the fixed arc contact member 17 is securely coupled to the support housing 9 so that it can rotate together with the latter about the rotation axis A1.

[0101] The fixed arc contact component 17 is at least partially made of a conductive material.

[0102] The fixed arc contact member 17 is preferably formed of an elongated conductive material, one end of which is coupled to a first connecting member 170 (e.g., formed by a bolt), which in turn is coupled to a first main contact member 15, while the relatively free end (e.g., a T-shaped end) includes a movable arc contact member 18. Figure 3 and Figure 6 Suitable contact surface.

[0103] However, in principle, the fixed arc contact component 17 can be implemented according to other known types of schemes (e.g., with blade configuration), which will not be described in detail here for the sake of brevity.

[0104] The movable arc contact member 18 is coupled to the support housing 9 so that it can rotate together with the latter about the rotation axis A1. However, the movable arc contact member 18 can move relative to the housing 9 and the fixed arc contact member 17 along a translation axis (preferably the longitudinal axis A2) perpendicular to the rotation axis A1 of the movable contact assembly 10.

[0105] During operation, the arc contact member 18 can be coupled or decoupled from the arc fixed contact member 17 by moving along the translation axis A2.

[0106] Preferably, the movable arc contact member 18 is coupled to the second main contact member 16.

[0107] As shown in the accompanying drawings, the movable arc contact member 18 is preferably formed of a conductive material molding, one end of which is coupled to the second connecting member 180, while the relatively free end (e.g., a T-shaped end) includes a suitable contact surface with a fixed arc contact member 17.

[0108] The connecting member 180 is coupled to each blade of the second main contact member 16, and the first connecting pin 220 is coupled to the blade of the second main contact member 16. Thus, the movable arcuate contact member 18 can move along the translation axis A2 with each blade, while rotating about the rotation axis A1 with the movable contact assembly 10. Figure 4 and Figure 7 ).

[0109] As shown in the accompanying drawings, the connecting member 180 is preferably formed of a conductive material molding, a portion of which is formed by bolts coupled to the movable arc contact member 18, while another portion includes a pair of parallel blades arranged parallel to the blades of the second main contact member 16.

[0110] However, in principle, the movable arc contact component 18 can be implemented according to other known types of schemes (e.g., according to configuration), which will not be described in detail here for the sake of brevity.

[0111] As mentioned above, the movable contact assembly 10 of each electrode includes a vacuum chamber 14 in which a vacuum atmosphere exists.

[0112] Conveniently, the arc contact components 17 and 18 are housed in the vacuum chamber 14 so that their contact surfaces are coupled or decoupled from each other inside the vacuum chamber, thus permanently immersed in the vacuum atmosphere.

[0113] The vacuum chamber 14 can be implemented according to known types of schemes. Therefore, for the sake of brevity, only aspects of interest of the present invention will be described below.

[0114] During operation, the switching device 1 can switch between three different operating states.

[0115] Specifically, the switching device 1 can be switched to:

[0116] - Closed state, wherein each electrode 2 has a first electrode terminal 11 and a second electrode terminal 12 electrically connected to each other and electrically disconnected from the ground terminal 13. When the switching device is in the closed state, line current or fault current can flow along each electrode 2 between the corresponding first electrode terminal 11 and second electrode terminal 12; or

[0117] - In the open state, each electrode 2 has a first electrode terminal 11 and a second electrode terminal 12 that are electrically disconnected from each other, and a ground terminal 13. When the switching device is in the open state, current does not flow along the electrodes 2; or

[0118] - Grounded state, wherein each electrode 2 has a first electrode terminal 11 and a second electrode terminal 12 electrically disconnected from each other, and a second electrode terminal 12 and a ground terminal 13 electrically connected to each other. When the switching device is in the grounded state, line current does not flow along the electrode 2. However, the second electrode terminal 12 of each electrode (and the second line conductor connected thereto) is placed at the ground voltage.

[0119] During operation, the switching device 1 can perform different types of actions, each action corresponding to a given transition between the above-mentioned operating states.

[0120] Specifically, the switching device 1 is capable of:

[0121] - When it switches from the closed state to the open state, a disconnection action is performed; or

[0122] - When switching from the open state to the closed state, a closing action occurs; or

[0123] - The disconnection action occurs when switching from the disconnected state to the grounded state; or

[0124] - Reconnection action when switching from grounded state to disconnected state.

[0125] Obviously, the switching device 1 can switch from the closed state to the grounded state by performing an opening action and a subsequent opening action.

[0126] Similarly, the switching device 1 can switch from the grounded state to the closed state by performing a reconnection operation and a subsequent closing and opening operation.

[0127] In order to perform the above-mentioned operation of the switching device, the motion transmission shaft 3 drives the movable contact assembly 10 of each electrode in a suitable manner according to the first rotation direction R1 or the second rotation direction R2.

[0128] Generally, driven by the motion transmission shaft 3, the movable contact assembly 10 of each electrode can reach the first operating end position P corresponding to the closed state of the switching device. A The second operation end position P corresponds to the grounding state of the switching device. C They can move reversibly between each other.

[0129] Conveniently, when the movable contact assembly 10 is in the first end-of-operation position P A With the second run end position P C When moving between, the intermediate position PB Corresponding to the open state of the switching device ( Figures 8 to 16 ).

[0130] When the movable contact assembly 10 is in the first end-of-operation position P A When the switch is in the closed state, the first main contact member 15 is coupled to the first fixed contact member 5 and decoupled from the fourth fixed contact member 8, the second main contact member 16 is coupled to the second fixed contact member 6 and decoupled from the third fixed contact member 7, and the movable arc contact member 18 is coupled to the fixed arc contact member 17.

[0131] When the movable contact assembly 10 is in the second end-of-operation position P C When the switching device is in a grounded state, the first main contact member 15 is decoupled from the first fixed contact member 5 and coupled to the fourth fixed contact member 8, the second main contact member 16 is decoupled from the second fixed contact member 6 and coupled to the third fixed contact member 7, and the movable arc contact member 18 is coupled to the fixed arc contact member 17.

[0132] When the movable contact assembly 10 is in the middle position P B Furthermore, when the switching device is in the open state, the first main contact component 15 is decoupled from the first fixed contact component 5 and the third fixed contact component 8, and the second main contact component 16 is decoupled from the second fixed contact component 6 and the third fixed contact component 7.

[0133] However, unlike the known arrangement in the prior art, when the movable contact assembly 10 is in the intermediate position P B At that time, the movable arc contact component 18 is coupled to the fixed arc contact component 17.

[0134] Because this scheme prevents or reduces the occurrence of partial discharge phenomena in the internal volume of the switching device that may frequently occur due to parasitic capacitance when the switching device is in the open state, it allows for a significant improvement in the overall dielectric behavior of the switching device.

[0135] According to one aspect of the invention, each electrode 2 includes at least one track member 20 made of an electrically insulating material and having a track surface 21 with a cam profile; and at least one drive member 22, which is firmly coupled to the movable arc contact member 18 and slidably coupled to the track surface 21 of the corresponding track member 20.

[0136] Preferably, each electrode 2 includes a track member 20 and a corresponding drive member 22 for each blade of the second main contact member 16. Figure 2 and Figure 5 ).

[0137] In the embodiment shown in the accompanying drawings, each electrode 2 includes a pair of track members 20 and a corresponding pair of drive members 22, each being slidably coupled to the track surface 21 of the corresponding track member 20.

[0138] Each track component 20 can be fixed to the insulating housing 4 or a component thereof.

[0139] In the embodiment shown in the accompanying drawings, each track member 20 extends between the second fixed contact member 6 and the third fixed contact member 7, and conveniently has a curved shape.

[0140] Preferably, the track surface 21 of each track member 20 is arranged at the outer edge of the track surface 21, which faces the wall of the insulating housing 4 where the second fixed contact member 6 and the third fixed contact member 7 are located.

[0141] Preferably, each drive member 22 is formed of a roller arranged to run along the track surface 21 of the corresponding track member 20.

[0142] In the embodiment shown in the accompanying drawings, each drive member 22 is slidably coupled to the second main contact member 16.

[0143] Preferably, each drive member 22 is arranged outside the corresponding blade of the second main contact member 16 and is coupled to the movable arc contact member 18 by means of the aforementioned connecting pin 220 and connecting member 180.

[0144] In the embodiment shown in the referenced figures, permanent contact between each drive member 22 and the corresponding track surface 21 of the track member 20 is ensured by a coupling force generated by a negative pressure that is constantly applied to the movable arc contact member 18 when it is housed in the vacuum chamber 14 (and guided to move the latter toward the fixed arc contact member 17).

[0145] However, according to other embodiments of the invention, permanent contact between the drive member 22 and the track surface 21 can also be ensured in different additional ways, for example, by arranging a restricted tracking slot in which the drive member 22 can slide in a suitable manner.

[0146] Conveniently, as the movable contact assembly 10 (and the movable arc contact 18) rotates about the rotation axis A1, each drive member 22 slides along the track surface 21 of the corresponding track member 20.

[0147] Thus, when the movable contact assembly 10 is in the first operation end position P A At that time, the driving component 22 is in the first position T along the track surface 21. A ( Figure 8When the movable contact assembly 10 is in the middle position P B At that time, the driving component 22 is in the second position T along the track surface 21. B ( Figure 12 ); and when the movable contact assembly 10 is in the second operation end position P C At that time, the driving component 22 is in the third position T along the track surface 21. C ( Figure 16 ).

[0148] Second position T B Obviously in the first position T A With the third position T C between.

[0149] In the embodiment shown in the cited figures, the first position T A Conveniently located at the second fixed contact member 6, the third position T C Located at the third fixed contact member 7, and at the second position T B With the first position T A and the third position T C Basically equidistant.

[0150] As it slides along the corresponding track surface 21 (following the curved trajectory), each drive member 22 actuates the movable arc contact member 18 along the translation axis A2 between a coupled position with the fixed arc contact member 17 and a decoupled position with the fixed arc contact member 17, due to the cam profile of the track surface.

[0151] Preferably, the track surface 21 is shaped such that when the drive member 22 is in the first position T A Or in the second position T B Or at the third position T along the track surface 21 C At that time, the movable arc contact member 18 is actuated at the coupling position with the fixed arc contact member 17.

[0152] Preferably, when each driving member 22 is in the first position T A With the second position T B When sliding between them, each drive member 22 slides along the first track surface portion 21A having a cam profile.

[0153] As it slides along the first track surface portion 21A, each drive member 22 actuates the movable arc contact member 18 along the longitudinal axis A2 between a coupled position with the fixed arc contact member 17 and a decoupled position with the fixed arc contact member 17.

[0154] Specifically, the first track surface portion 21A is shaped to decouple the movable arc contact member 18 from the fixed arc contact member 17, and then recouples it to the fixed arc contact member 17 when the drive member 2 slides along the first track surface portion.

[0155] Therefore, refer to Figures 8 to 16 The observation plane, the first track surface portion 21A conveniently includes, respectively, at the first position T A Second position T B The first and second surface segments that bend toward the fixed arc contact member 17, and the second surface segment that bends away from the fixed arc contact member 17 between the first and second surface segments.

[0156] Preferably, when each driving member 22 is in the second position T B With the third position T C When sliding between them, each drive member 22 slides along the second track surface portion 21B with a cam profile.

[0157] As it slides along the second track surface portion 21B, each drive member 22 actuates the movable arc contact member 18 along the longitudinal axis A2 between a coupled position with the fixed arc contact member 17 and a decoupled position with the fixed arc contact member 17.

[0158] Specifically, the second track surface portion 21B is shaped such that when the drive member 22 slides along the second track surface portion 21B, the movable arc contact member 18 is decoupled from the fixed arc contact member 17, and then recoupled to the fixed arc contact member 17.

[0159] Therefore, refer to Figures 8 to 16 The observation plane, the second track surface portion 21B includes the second position T respectively. B and the third position T C The fourth and fifth surface segments that bend toward the fixed arc contact member 17, and the sixth surface segment that bends away from the fixed arc contact member 17 between the fourth and fifth surface segments.

[0160] According to one aspect of the invention, each electrode 2's movable contact assembly 10 includes a cam mechanism 25 coupled to a movable arc contact member 18.

[0161] When the movable arc contact component 18 is coupled to the fixed arc contact component 17 and the movable contact assembly 10 is in the first end-of-operation position P A Or the second run end position P C At this time, the cam mechanism 25 is conveniently adapted to press the movable arc contact member 18 against the fixed arc contact member 17.

[0162] Preferably, the cam mechanism 25 includes a push member 26 and a spring member 27, the push member 26 being movable relative to the movable contact member 18 (and each blade of the second main contact member 16) along the translation axis A2, and the spring member 27 being coupled to the push member 26 and the movable arc contact member 18, more specifically, to the aforementioned connecting member 180.

[0163] Preferably, the pushing member 26 is formed by a sleeve arranged coaxially with the connecting member 180 along the longitudinal axis A2.

[0164] Preferably, the spring member 27 is formed of a compression spring arranged along the longitudinal axis A2, one end of which is coupled to the coupling surface of the connecting member 180, and the opposite end is coupled to the coupling surface of the pushing member 26.

[0165] According to some embodiments of the present invention ( Figures 2 to 4 The cam mechanism 25 includes a slider member 28 coupled to the push member 26.

[0166] When the movable contact assembly 10 is in the first end-of-operation position P A Or the second run end position P C At this time, the slider component 28 can be connected to one or more first cam surfaces 31 or one or more second cam surfaces 32 respectively.

[0167] When coupled to one or more first cam surfaces 31 or one or more second cam surfaces 32, the slider member 28 applies an actuating force to the push member 26, which is directed to compress the spring member 27 and subsequently press the movable arc contact member 18 against the fixed arc contact member 17.

[0168] Preferably, the slider member 28 is formed of a roller rotatably coupled to a second connecting pin 280, which in turn is securely coupled to the push member 26. Figure 4 ).

[0169] exist Figures 2 to 4 In the illustrated embodiment, the slider member 28 is conveniently positioned in the gap between the parallel blades of the second main contact member 6, and it can move relative to these latter members along the translation axis A2.

[0170] Preferably, the first clamping member 310 can be fixed to the second fixed contact member 6, conveniently fixed between the parallel blades of the latter. Alternatively, the first clamping member 310 and the second fixed contact member 6 can be implemented as a single piece.

[0171] The first clamping component 310 includes one or more first cam surfaces 31 ( Figure 3 and Figure 4 ).same( Figure 3 The second clamping member 320 can be fixed to the third fixing contact member 7, conveniently secured between the latter's parallel blades. Alternatively, the second clamping member 320 can be implemented as a single piece with the third fixing contact member 7. The second clamping member 320 includes one or more second cam surfaces 32.

[0172] Depending on possible variations, the first cam surface 31 and the second cam surface 32 may be part of a clamping component that is firmly coupled to or integrally formed with the insulating housing 4.

[0173] Other embodiments of the present invention ( Figures 5 to 7 The cam mechanism 25 includes a lever member 29, which includes one or more first lever surfaces coupled to the push member 26 and a first operating end position P when the movable contact assembly 10 is in the first operating end position. A Or the second run end position P C One or more second lever surfaces that are coupled to one or more sliding surfaces 33 or one or more second sliding surfaces 34.

[0174] When coupled to one or more first sliding surfaces 33 or one or more second sliding surfaces 34, the lever member 29 applies an actuating force to the push member 26, which is directed to compress the spring member 27 and subsequently press the movable arc contact member 18 against the fixed arc contact member 17.

[0175] The lever member 29 is preferably firmly coupled to the movable arc contact member 18 (more specifically, to the second connecting member 180).

[0176] exist Figures 5 to 7 In the embodiment shown, the lever member 29 is a cam lever that is rotatably coupled to the first connecting pin 220 and located between the parallel blades of the second main contact member 6.

[0177] Preferably, the third clamping member 331 supporting the first roller 332 is fixed between the parallel blades of the second fixed contact member 6. The first roller 332 includes one or more first sliding surfaces 33 for the lever member 29. Figure 6 and Figure 7 ).

[0178] same( Figure 6 The fourth clamping member 334 supporting the second roller 342 is fixed between the parallel blades of the third fixed contact member 7. The second roller 334 includes one or more second sliding surfaces 34 of the lever member 29.

[0179] Depending on possible variations, the first cam surface 31 and the second cam surface 32 may be provided by rollers that are coupled to the clamping member in a suitable manner, the clamping member being firmly coupled to or integrally formed with the insulating housing 4.

[0180] Now, special reference Figures 5 to 7 The embodiments of the present invention will describe in more detail the operation of the switching device 1 for each electrode 2. The switching device 1 in... Figures 2 to 4 The embodiments operate in a similar manner.

[0181] Closed state of the switching device

[0182] When the switching device is in the closed state, each electrode 2 is in the following state: Figure 8 Under the operating conditions shown.

[0183] In this case, in each electrode 2:

[0184] - The movable contact assembly 10 is in the first end-of-operation position P A ;

[0185] - The first main contact member 15 is coupled to the first fixed contact member 5;

[0186] - The second main contact member 16 is coupled to the second fixed contact member 6;

[0187] - The movable arc contact component 18 is coupled to the fixed arc contact component 17;

[0188] - The cam mechanism 25 presses the movable arc contact member 18 against the fixed arc contact member 17;

[0189] - Each guide member 22 is in the first position T along the track surface 21 of the corresponding track element 20. A .

[0190] When electrode 2 is under these operating conditions, the line current can flow between the first electrode terminal 11 and the second electrode terminal 12, the first fixed contact member 5 and the second fixed contact member 6, the first main contact member 15 and the second main contact member 16, and the first arc contact member 17 and the second arc contact member 18, all of which are connected in series.

[0191] Open state of the switching device

[0192] When the switching device is in the open state, each electrode 2 is in Figure 12 Under the operating conditions shown.

[0193] In this case, in each electrode 2:

[0194] - The movable contact assembly 10 is in the middle position P B ;

[0195] - The first main contact component 15 is decoupled from the first fixed contact component 5 and the fourth fixed contact component 8;

[0196] - The second main contact component 16 is decoupled from the second fixed contact component 6 and the third fixed contact component 7;

[0197] - The movable arc contact component 18 is coupled to the fixed arc contact component 17;

[0198] - Cam mechanism 25 is not in operation;

[0199] - Each guide member 22 is located at a second position T along the track surface 21 of the corresponding track element 20. B .

[0200] When electrode 2 is under these operating conditions, there is no current flow between the first electrode terminal 11 and the second electrode terminal 12.

[0201] Grounding status of switching device

[0202] When the switching device is in the grounded state, each electrode 2 is in the grounded state. Figure 16 Under the operating conditions shown.

[0203] In this case, in each electrode 2:

[0204] - The movable contact assembly 10 is in the second end-of-operation position P C ;

[0205] - The first main contact member 15 is coupled to the fourth fixed contact member 8;

[0206] - The second main contact component 16 is coupled to the third fixed contact component 7;

[0207] - The movable arc contact component 18 is coupled to the fixed arc contact component 17;

[0208] - The cam mechanism 25 presses the movable arc contact member 18 against the fixed arc contact member 17;

[0209] - Each guide member 22 is located at a third position T along the track surface 21 of the corresponding track element 20. C .

[0210] When electrode 2 is under these operating conditions, there is no line current flowing between the first electrode terminal 11 and the second electrode terminal 12, and the second electrode terminal 12 is grounded.

[0211] Disconnect action

[0212] The switching device 1 performs a disconnection action when switching from the closed state to the open state.

[0213] First, each electrode 2 is therefore in Figure 8 Under the operating conditions.

[0214] During the disconnection operation of the switching device, each movable contact assembly 10 is in the first end-of-operation position P according to the first rotation direction R1. A With the middle position P B Move between them.

[0215] The first main contact member 15 moves away from the first fixed contact member 5, while the second main contact member 16 moves away from the second fixed contact member 6.

[0216] As the second main contact member 16 begins to move along the first rotation direction R1, the lever member 29 gradually decouples from the first sliding surface 33. Figures 5 to 7 Similarly, in Figures 2 to 4 In one embodiment, the slider component 28 is gradually decoupled from the first cam surface 31.

[0217] As a result, in both cases, the spring member 27 is gradually released, and the movable arc contact member 18 no longer presses against the fixed contact member 17.

[0218] Simultaneously, the guide member 22 begins to move away from the first position T by sliding along the first track surface portion 21A. A Towards the second position T B Movement. However, the latter is configured such that the movable arc contact member 18 remains coupled to the fixed arc contact member 17 until the spring member 27 is released.

[0219] During this phase of the disconnection action ( Figure 9 The first main contact component 15 and the second main contact component 16 are still coupled to the first fixed contact component 5 and the second fixed contact component 6, respectively, and no electric arc phenomenon has occurred between the separated electrical contacts.

[0220] As the movable contact assembly 10 moves further, the guide member 22 continues to slide along the first track surface portion 21A (particularly along the first section of the latter), thereby moving towards the second position T. B move( Figure 10The movable arc contact member 18 is gradually decoupled from the fixed arc contact member 17. The first track surface portion 21A is conveniently shaped to decouple the movable arc contact member 18 from the fixed arc contact member 17, while the first main contact member 15 and the second main contact member are still coupled to the first fixed contact member 5 and the second fixed contact member 6. In this way, the possible arc discharge phenomenon caused by the gradual interruption of the current flowing along the electrodes occurs only inside the vacuum chamber 14. During this stage of the disconnection operation, the lever member 29 is decoupled from the first sliding surface 33. The cam mechanism 25 is no longer in operation, and the spring member 27 is released.

[0221] As the movable contact assembly 10 moves further, the guide member 22 continues to slide along the first track surface portion 21A (particularly along the third section of the latter), thereby moving towards the second position T. B move( Figure 11 ).

[0222] The movable arc contact component 18 is decoupled from the fixed arc contact component 17, and the first main contact component 15 and the second main contact component 16 are decoupled from the first fixed contact component 5 and the second fixed contact component 6. Since the interruption of the current flowing along the electrode 2 has been completed, there is usually no arc discharge between the separated electrical contacts during this stage of the disconnection operation.

[0223] During this disengagement phase, the cam mechanism 25 is not in operation, and the spring member 27 is released.

[0224] As the movable contact assembly 10 moves further, the guide member 22 continues to slide along the first track surface portion 21A (particularly along the second section of the latter) and reaches the second position T. B At this time, the movable contact assembly 10 reaches the middle position P. B ( Figure 12 ).

[0225] The movable arc contact member 18 is recoupled to the fixed arc contact member 17, while the first main contact member 15 and the second main contact member 16 remain decoupled from the first fixed contact member 5 and the second fixed contact member 6.

[0226] In the final stage of the disconnection action, the cam mechanism 25 is not operated, and the spring member 27 is released.

[0227] Switch 1 is currently in the off state.

[0228] Closing action

[0229] The switching device 1 performs a closing action when switching from the open state to the closed state.

[0230] Initially, each electrode 2 is therefore in Figure 12 Under the operating conditions.

[0231] During the closing action of the switching device, each movable contact assembly 10 is in the intermediate position P according to the second rotation direction R2. B With the first run end position P A Move between them.

[0232] The first main contact member 15 moves toward the first fixed contact member 5, while the second main contact member 16 moves toward the second fixed contact member 6.

[0233] When the second main contact member 16 begins to move along the second rotation direction R2, the guide member 22 moves away from the second position T by sliding along the first track surface portion 21A (particularly along the second section of the latter). B Towards the first position T A Movement. Therefore, the movable arc contact member 18 gradually decouples from the fixed arc contact member 17. Figure 11 ).

[0234] During this phase of the closing action, the cam mechanism 25 is not in operation, and the spring member 27 is released.

[0235] As the movable contact assembly 10 moves further, the guide member 22 remains slidable along the first track surface portion 21A (particularly along the third section of the latter), thereby moving toward the first position T. A move( Figure 10 ).

[0236] The movable arc contact component 18 remains decoupled from the fixed arc contact component 17, while the first main contact component 15 and the second main contact component 16 gradually couple with the first fixed contact component 5 and the second fixed contact component 6, respectively.

[0237] During this phase of the closing action, the cam mechanism 25 is not in operation, and the spring member 27 remains released.

[0238] As the movable contact assembly 10 moves further, the guide member 22 continues to slide along the first track surface portion 21A (particularly along the third and first sections of the latter), thereby moving towards the first position T. A move( Figure 9 ).

[0239] The movable arc contact component 18 is gradually coupled to the fixed arc contact component 17, while the first main contact component 15 and the second main contact component 16 have been coupled to the first fixed contact component 5 and the second fixed contact component 6.

[0240] Simultaneously, lever member 29 contacts the first sliding surface 33 and begins to apply increased actuating force to pushing member 26. Figures 5 to 7 ).

[0241] Similarly, in Figures 2 to 4 In one embodiment, the slider member 28 contacts the first cam surface 31 and begins to apply increased actuation force to the push member 26.

[0242] As a result, in both cases, the spring member 27 is gradually compressed.

[0243] As the movable contact assembly 10 moves further, the guide member 22 remains slidable along the first track surface portion 21A (particularly along the first section of the latter) and reaches the first position T. A At this time, the movable contact assembly 10 reaches the closed position P. A ( Figure 8 ).

[0244] The movable arc contact member 18 is coupled to the fixed arc contact member 17, and the first main contact member 15 and the second main contact member 16 are coupled from the first fixed contact member 5 and the second fixed contact member 6.

[0245] The lever component 29 is fully coupled to the sliding surface 33. Similarly, in... Figures 2 to 4 In one embodiment, the slider member 28 is fully coupled to the cam surface 31.

[0246] As a result, in both cases, the spring member 27 reaches its maximum compression, and the movable arc contact member 18 is pressed against the fixed arc contact member 17.

[0247] Switch 1 is now in the closed state.

[0248] Disconnect action

[0249] Switching device 1 performs a disconnection action when switching from the open state to the ground state.

[0250] Obviously, before performing the disconnection action, the switching device must perform the disconnection action as described above in order to switch in the disconnected state.

[0251] Initially, each electrode 2 is therefore in Figure 12 Under the operating conditions.

[0252] During the disconnection operation of the switching device, each movable contact assembly 10 is in the intermediate position P according to the first rotation direction R1. B With the second run end position P C Move between them.

[0253] The first main contact component 15 moves toward the fourth fixed contact component 8, while the second main contact component 16 moves toward the third fixed contact component 7.

[0254] As the second main contact member 16 begins to move along the first rotational direction R1, the guide member 22 moves away from the second position T by sliding along the second track surface portion 21B (particularly along the fourth section of the latter). B Towards the third position T C Movable. The movable arc contact component 18 gradually decouples from the fixed arc contact component 17. Figure 13 ).

[0255] During this disengagement phase, the cam mechanism 25 is not in operation, and the spring member 27 is released.

[0256] As the movable contact assembly 10 moves further, the guide member 22 continues to slide along the second track surface portion 21B (particularly along the sixth segment of the latter), thereby moving towards the third position T. C move( Figure 14 ).

[0257] The movable arc contact component 18 is decoupled from the fixed arc contact component 17, while the first main contact component 15 and the second main contact component 16 are gradually coupled to the fourth fixed contact component 8 and the third fixed contact component 7, respectively.

[0258] During this disengagement phase, the cam mechanism 25 is not in operation, and the spring member 27 remains released.

[0259] As the movable contact assembly 10 moves further, the guide member 22 remains slidable along the second track surface portion 21B (particularly along the fifth section of the latter), thereby moving toward the third position T. C move( Figure 15 ).

[0260] The movable arc contact component 18 is gradually coupled to the fixed arc contact component 17, while the first main contact component 15 and the second main contact component 16 have been coupled to the fourth fixed contact component 8 and the third fixed contact component 7, respectively.

[0261] Simultaneously, lever member 29 contacts the second sliding surface 34 and begins to apply increased actuating force to pushing member 26. Figures 5 to 7 ).

[0262] Similarly, in Figures 2 to 4 In one embodiment, the slider member 28 contacts the second cam surface 32 and begins to apply increased actuation force to the push member 26.

[0263] As a result, in both cases, the spring member 27 is gradually compressed.

[0264] As the movable contact assembly 10 moves further, the guide member 22 remains slidable along the second track surface portion 21B (particularly along the fifth section of the latter) and reaches the third position T. C At this point, the movable contact assembly 10 reaches the second end-of-run position P. C ( Figure 16 ).

[0265] The movable arc contact member 18 is coupled to the fixed arc contact member 17, and the first main contact member 15 and the second main contact member 16 are coupled to the fourth fixed contact member 8 and the third fixed contact member 7, respectively.

[0266] The lever component 29 is fully coupled to the second sliding surface 34.

[0267] Similarly, in Figures 2 to 4 In one embodiment, the slider member 28 is fully coupled to the second cam surface 32.

[0268] As a result, in both cases, the spring member 27 reaches its maximum compression, and the movable arc contact member 18 is pressed against the fixed arc contact member 17.

[0269] Switching device 1 is now in the grounded state.

[0270] Reconnection action

[0271] When the switching device 1 switches from the grounded state to the disconnected state, it performs a reconnection operation.

[0272] First, each electrode 2 is therefore in Figure 16 Under the operating conditions.

[0273] During the reconnection operation of the switching device, each movable contact assembly 10 is in the second end-of-operation position P according to the second rotation direction R2. C With the middle position P B Move between them.

[0274] The first main contact member 15 moves away from the fourth fixed contact member 8, while the second main contact member 16 moves away from the third fixed contact member 7.

[0275] As the second main contact member 16 begins to move according to the second rotation direction R2, the lever member 29 gradually decouples from the second sliding surface 34. Figures 5 to 7 ).

[0276] Similarly, in Figures 2 to 4 In one embodiment, the slider component 28 is gradually decoupled from the second cam surface 32.

[0277] As a result, in both cases, the spring member 27 is gradually released, and the movable arc contact member 18 no longer presses against the fixed contact member 17. Figure 15 ).

[0278] Simultaneously, the guide member 22 begins to move away from the third position T by sliding along the second track surface portion 21B. C Towards the second position T B move.

[0279] As the movable contact assembly 10 moves further toward the central position P B During movement, the guide member 22 remains slidable along the second track surface portion 21B (particularly along the fifth and sixth sections of the latter) according to the second rotation direction R2, thereby moving towards the second position T. B move( Figure 14 The movable arc contact component 18 gradually decouples from the fixed arc contact component 17.

[0280] During this disengagement phase, the cam lever 29 (or slider member 28) is decoupled from the second sliding surface 34 (or second cam surface 32). The cam mechanism 25 ceases operation, and the spring member 27 is released.

[0281] As the movable contact assembly 10 moves further, the guide member 22 remains slidable along the second track surface portion 21B (particularly along the fifth section of the latter), thereby moving toward the second position T. B move( Figure 13 ).

[0282] The movable arc contact component 18 is decoupled from the fixed arc contact component 17, and the first main contact component 15 and the second main contact component 16 are decoupled from the first fixed contact component 5 and the second fixed contact component 6.

[0283] During this disengagement phase, the cam mechanism 25 is not in operation, and the spring member 27 is released.

[0284] As the movable contact assembly 10 moves further, the guide member 22 remains slidable along the second track surface portion 21B (particularly along the fourth section of the latter). When the movable contact assembly 10 reaches the intermediate position P... B ( Figure 12 When the guide component 22 reaches the second position T, B .

[0285] The movable arc contact member 18 is recoupled to the fixed arc contact member 17, while the first main contact member 15 and the second main contact member 16 remain decoupled from the first fixed contact member 5 and the second fixed contact member 6.

[0286] In the final stage of the reconnection action, the cam mechanism 25 is inactive, and the spring member 27 is released.

[0287] Switch 1 is currently in the off state.

[0288] The switching device according to the invention can be modified and altered, and these modifications and alterations still fall within the scope of the invention.

[0289] According to some embodiments of the invention (not shown), for example, the positions of the fixed arc contact member 17 and the movable arc contact member 18 can be reversed for each electrode 2. In this case, the fixed arc contact member 17 will be electrically connected to the second main contact member 16, while the movable arc contact member 18 will be electrically connected to the first main contact member 15. Each guide member 22 and cam mechanism 25 will be operably associated with the first main contact member 15, while each track element 20 will be arranged between the first fixed contact member 5 and the fourth contact member 8, in a symmetrical position relative to the positions shown in the referenced figures.

[0290] As another example, according to other embodiments of the invention (not shown), both arc contact members may be movable. In this case, one or more other guide members and other cam mechanisms will be operatively associated with the first main contact member 15, while one or more other track elements will be arranged between the first fixed contact member 5 and the fourth contact member 8.

[0291] The switching device according to the present invention has significant advantages over known devices in the prior art.

[0292] In the switching device of the present invention, the electrical contacts 17, 18 housed within the vacuum chamber 14 of each electrode are decoupled in a transient manner during operation of the switching device, but remain coupled to each other when the switching device is in a closed, open, or grounded state. This allows for improved dielectric behavior of the internal components of the switching device, particularly when the latter is in an open state.

[0293] In the switching device of the present invention, the separation between the electrical contacts 17 and 18, housed within the vacuum chamber 14, is driven by the positions reached by the main contact members 15 and 16 during the disconnection operation of the switching device. Therefore, the interruption of the current flowing along each electrode occurs at the level of the electrical contacts 17 and 18. Consequently, any possible arcing resulting from the interruption of the current flowing along each electrode can only form in a vacuum atmosphere, which allows for improved quenching.

[0294] The switching device of the present invention has electrodes with a very compact, simple and robust structure, which has related advantages in terms of size optimization.

[0295] The switching device according to the invention ensures a high level of performance in terms of dielectric insulation and arc extinguishing capability during the current interruption process, while also being characterized by a high level of reliability for the intended application.

[0296] The industrial production and field installation of the switching device according to the present invention are relatively easy and inexpensive.

Claims

1. A switching device (1) for a medium-voltage power system, the switching device comprising one or more electrodes (2). For each electrode, the switching device includes: - A first electrode terminal (11), a second electrode terminal (12), and a ground terminal (13), wherein the first electrode terminal (11) is electrically coupled to a first conductor of the wire, the second electrode terminal (12) is electrically coupled to a second conductor of the wire, and the ground terminal (13) is electrically coupled to a ground conductor; - A fixed contact assembly, comprising a plurality of fixed contact members spaced apart from each other. The fixed contact assembly includes a first fixed contact member (5) electrically connected to the first electrode terminal (11), a second fixed contact member (6) and a third fixed contact member (6, 7) electrically connected to the second electrode terminal (12), and a fourth fixed contact member (8) electrically connected to the ground terminal (13). - A movable contact assembly (10) rotatable about a rotation axis (A1) and comprising: - The first main contact member (15) can be coupled to the first fixed contact member (5) or the fourth fixed contact member (8) when the movable contact assembly rotates about the rotation axis (A1). - The second main contact member (16) can be coupled to the second fixed contact member (6) or the third fixed contact member (7) when the movable contact assembly rotates about the rotation axis (A1). - A vacuum chamber (14) and an arc contact member (17, 18) pair, wherein the arc contact member (17, 18) pair is housed in the vacuum chamber and is capable of being coupled or decoupled from each other, and each arc contact member is connected in series to the corresponding main contact member (15, 16). The arc contact components (17, 18) include a fixed arc contact component (17) and a movable arc contact component (18). The movable arc contact member (18) can be coupled or decoupled from the fixed arc contact member (17) by moving along a translation axis (A2) perpendicular to the rotation axis (A1); The movable contact assembly is in the first operational end position (P) corresponding to the closed state of the switching device. A In the second operation end position (P) corresponding to the grounding state of the switching device C ), and in the intermediate position corresponding to the open state of the switching device (P) B The first electrode terminal (11), the second electrode terminal (12), and the ground terminal (13) are reversibly movable about the axis of rotation (A1), wherein the first electrode terminal (11), the second electrode terminal (12), and the ground terminal (13) are electrically isolated from each other; When the movable contact assembly (10) is in the first operation end position (P) A When the first main contact member (15) is coupled to the first fixed contact member (5), the second main contact member (16) is coupled to the second fixed contact member (6), and the arc contact members (17, 18) are coupled to each other. For each electrode, the switching device includes at least one track member (20) and at least one drive member (22), the at least one track member (20) being made of an electrically insulating material and having a track surface (21) with a cam profile, and the at least one drive member (22) being firmly coupled to the movable arc contact member (18). As the movable contact assembly (10) rotates about the rotation axis (A1), each drive member (22) is adapted to slide along the track surface (21) of the corresponding track member (20). When sliding along the track surface (21), each drive member (22) actuates the movable arc contact member (18) along the translation axis (A2) between a coupled position with the fixed arc contact member (17) and a decoupled position with the fixed arc contact member (17). When the movable contact assembly (10) is in the first operation end position (P) A When the drive member (22) is in the first position (T) along the track surface (21), the drive member (22) is in the first position (T) along the track surface (21). A ), When the movable contact assembly (10) is in the intermediate position (P) B When the drive member (22) is in the second position (T) along the track surface (21), the drive member (22) is in the second position (T). B ), When the movable contact assembly (10) is in the second operation end position (P) C When the drive member (22) is in the third position (T) along the track surface (21), the drive member (22) is in the third position (T). C ), The second position (T) B It is located between the first position and the third position. Where at the first position (T) A ) and the second position (T) B When moving between the two positions, the drive member (22) slides along a first track surface portion (21A) having a cam profile; and when in the second position (T B ) and the third position (T) C When moving between the two, the drive member (22) slides along the second track surface portion (21B) having a cam profile. The feature is that when the movable contact assembly (10) is in the second operation end position (P) C When the first main contact member (15) is coupled to the fourth fixed contact member (8), the second main contact member (16) is coupled to the third fixed contact member (7), and the arc contact members (17, 18) are coupled to each other; When the movable contact assembly (10) is in the intermediate position (P) B When the first main contact component (15) is decoupled from the first fixed contact component (5) and the fourth fixed contact component (8), the second main contact component (16) is decoupled from the second fixed contact component (6) and the third fixed contact component (7), and the arc contact components (17, 18) are coupled to each other. The track surface (21) is shaped such that when the drive member (22) is located at the first position (T) along the track surface (21). A ), the second position (T) B ) and the third position (T) C When at any position in the fixed arc contact member (17), the movable arc contact member (18) is actuated to a coupling position with the fixed arc contact member (17). The track surface (21) is shaped such that when sliding along the first track surface portion (21A) or the second track surface portion (21B), the drive member (22) actuates the movable arc contact member (18) along the translation axis (A2) between a coupled position with the fixed arc contact member (17) and a decoupled position with the fixed arc contact member (17). When the drive member (22) slides along the first track surface portion (21A), the movable arc contact member (18) decouples from the fixed arc contact member (17) and is subsequently recoupled to the fixed arc contact member (17), and when the drive member (22) slides along the second track surface portion (21B), the movable arc contact member (18) decouples from the fixed arc contact member (17) and is subsequently recoupled to the fixed arc contact member (17).

2. The switching device according to claim 1, characterized in that, The movable contact assembly (10) includes a cam mechanism (25) coupled to the movable arc contact member (18). The cam mechanism is adapted to operate when the movable arc contact member (18) is coupled to the fixed arc contact member (17) and the movable contact assembly (10) is in the first end-of-operation position (P). A ) or at the second run-end position (P) B When the movable arc contact member (18) is pressed against the fixed arc contact member (17), the movable arc contact member (18) is pressed against the fixed arc contact member (17).

3. The switching device according to claim 2, characterized in that, The cam mechanism (25) includes: - The pushing member (26) is movable relative to the movable arc contact member (18) along the translation axis (A2); - A spring member (27) is arranged along the translation axis (A2) and coupled to the push member (26) and the movable arc contact member (18).

4. The switching device according to claim 3, characterized in that, The cam mechanism (25) includes a slider member (28) coupled to the push member (26), and when the movable contact assembly (10) is in the first end-of-operation position (P... A ) or at the second run-end position (P) C When the slider member (28) is coupled to one or more first cam surfaces (31) or one or more second cam surfaces (32), the slider member (28) can be coupled to one or more first cam surfaces (31) or one or more second cam surfaces (32). When the slider member (28) is coupled to one or more first cam surfaces (31) or one or more second cam surfaces (32), the slider member (28) applies an actuating force to the push member (26), the actuating force being directed to cause compression of the spring member (27), and subsequently presses the movable arc contact member (18) against the fixed arc contact member (17).

5. The switching device according to claim 3, characterized in that, The cam mechanism (25) includes a lever member (29) having a cam profile, and when the movable contact assembly (10) is in the first end-of-operation position (P... A ) or at the second run end position (P C When the lever member (29) is coupled to the push member (26) and one or more first sliding surfaces (33) or one or more second sliding surfaces (34), the lever member (29) can be coupled to the push member (26) and one or more first sliding surfaces (33) or one or more second sliding surfaces (34). When the lever member (29) is coupled to one or more first sliding surfaces (33) or one or more second sliding surfaces (34), the lever member (29) applies an actuating force to the push member (26), the actuating force being directed to compress the spring member (27) and subsequently press the movable arc contact member (18) against the fixed arc contact member (17).

6. The switching device according to any one of the preceding claims, characterized in that, The switching device is a load circuit breaker for medium-voltage power systems.

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