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 electrical contacts within a 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 a medium-voltage power system, and more specifically to a load circuit breaker for a medium-voltage power system. Background Technology

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

[0003] These switching devices, typically used in secondary distribution networks, provide circuit breaking functionality (i.e., breaking and connecting current) and circuit disconnect functionality (i.e., grounding the load-side section of the circuit) under specified circuit conditions (typically nominal conditions for breaking current and nominal or fault conditions for connecting current).

[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 energized parts and arc extinguishing capability when current is interrupted.

[0005] However, SF6 is a well-known potent greenhouse gas, and its use is strictly limited 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] Some load circuit breakers have been developed in which electrodes are immersed in pressurized dry air or an environmentally friendly insulating gas, such as a mixture of oxygen, nitrogen, carbon dioxide and / or fluorinated gases.

[0007] Unfortunately, experience has shown that these switching devices have not typically demonstrated a high level of reliability in operation.

[0008] 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

[0009] The main objective of this invention is to provide a switching device for MV power systems that allows for the resolution or mitigation of the aforementioned technical problems.

[0010] More specifically, the object of the present invention is to provide a switching device that exhibits a high level of reliability in operation.

[0011] Another 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 the current disconnection process.

[0012] Another object of the present invention is to provide a switching device with electrodes that are highly compact and simple in structure.

[0013] Another object of the present invention is to provide a switching device that can be easily manufactured at an industrial level at a competitive cost compared to prior art solutions.

[0014] To achieve these objectives and purposes, the present invention provides a switching device according to claim 1 and related dependent claims.

[0015] In a general definition, the switching device of the present invention includes one or more electrodes.

[0016] 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.

[0017] 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.

[0018] For each electrode, the switching device includes a movable contact assembly rotatable about a rotation axis. The movable contact assembly includes:

[0019] - A first main contact member, which can be coupled to a first fixed contact member or a fourth fixed contact member when the movable contact assembly rotates about the rotation axis;

[0020] - 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;

[0021] A vacuum chamber and a pair of arc contact components housed within the vacuum chamber. The arc contact components include a fixed arc contact component and a movable arc contact component. The movable arc contact component can be coupled to or decoupled from the fixed arc contact component by moving along a translation axis perpendicular to the rotation axis. Each arc contact component is electrically connected in series to a corresponding main contact component.

[0022] The movable contact assembly can reversibly move 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.

[0023] According to the present invention, each movable contact assembly includes a cam mechanism coupled to the movable arc contact member.

[0024] 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, the cam mechanism is adapted to press the movable arc contact member against the fixed arc contact member.

[0025] Preferably, the cam mechanism includes:

[0026] - A pushing member that is movable relative to a movable arc contact member along the translation axis;

[0027] - A spring member, arranged along the translation axis and coupled to a push member and a movable arc contact member.

[0028] According to some embodiments of the present invention, the cam mechanism includes a slider member coupled to a push member, and the slider member is capable of coupling with one or more first cam surfaces or one or more second cam surfaces when the movable contact assembly is in the first or 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 cause compression of the spring member and consequently, compression of the fixed arc contact member by the movable arc contact member.

[0029] According to other embodiments of the present invention, when the movable contact assembly is in the first end-of-operation position or the second end-of-operation position, 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.

[0030] 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 pushing member, which is directed to cause compression of the spring member and subsequent squeezing of the fixed arc contact member by the movable arc contact member.

[0031] 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 and pressed against each other.

[0032] Conveniently, 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 but not pressed against each other.

[0033] 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 and pressed against each other.

[0034] 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, the at least one drive member being firmly coupled to a movable arc contact member.

[0035] 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.

[0036] As the movable arc contact member slides along the track surface, each drive member actuates the movable arc contact member between the coupled and decoupled positions of the fixed arc contact member along a translation axis perpendicular to the rotation axis.

[0037] 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.

[0038] When the movable contact assembly is in the intermediate position, the drive member is in the second position along the track surface.

[0039] 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.

[0040] Conveniently, the second position is located between the first position and the third position.

[0041] 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.

[0042] When the drive member is in the first position, the second position, or the third position along the track surface, each drive member actuates the movable arc contact member to the coupling position of the fixed arc contact member.

[0043] When sliding along the first or second track surface portion, each drive member actuates the movable arc contact member along the translation axis between the coupled and decoupled positions of 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, non-limiting examples of which 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 , Figure 4A , Figure 4B This is a schematic diagram partially illustrating an embodiment of the switching device according to the present invention;

[0047] - Figures 5 to 7 , Figure 7A , Figure 7B This is a schematic diagram that partially illustrates another embodiment of the switching device according to the invention;

[0048] - Figures 8 to 16 It's a diagram. Figures 5 to 7 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, such as up to 72 kV AC and 100 kV DC.

[0051] Switching device 1 is particularly suitable for operation as a load circuit breaker. Therefore, switching device 1 is designed to provide circuit breaking functionality (nominal conditions for disconnecting current and nominal or fault conditions for connecting current) and circuit disconnecting functionality under specified circuit conditions, particularly grounding the load-side section 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 the switching device 1 includes a plurality of (e.g., three) electrodes 2.

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

[0055] Preferably, the insulating housing 4 has a longitudinal axis A1 ( Figure 1 The electrodes are developed into an elongated shape (e.g., roughly 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] Typically, the insulating housing 4 of the switching device can be implemented using known solutions. Therefore, for the sake of brevity, only aspects 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 another insulating gas with low environmental impact, such as a mixture of oxygen, nitrogen, carbon dioxide and / or fluorinated gas.

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

[0060] Typically, the terminals 11, 12, 13 of each electrode 2 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.

[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 component 5, a second fixed contact component 6, a third fixed contact component 7, and a fourth fixed contact component 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 attached image ( Figure 2 and Figure 5As shown in the figure, preferably, each fixed contact member 5, 6, 7, 8 is formed of a conductive material molded part provided with a pair of parallel blades, the parallel blades including suitable free contact surfaces having other electrical contacts.

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

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

[0067] Preferably, the fixed contact components 5 and 6 are aligned along the first reference plane perpendicular to the upper and lower walls of the insulating housing 4 and passing 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 within the internal volume of the switching device, on another opposite side of the insulating housing 4 relative to the longitudinal axis A1, particularly on the opposite sidewalls of the insulating housing (refer to the normal mounting position of the switching device, such as...). Figure 1 (As shown).

[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 to the second electrode terminal 12) by a suitable conductive member 67, which is formed of, for example, a molded part of conductive material (as shown in the accompanying drawings) 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 (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 according to a second rotation direction R2 (opposite to the first rotation direction R1).

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

[0077] As will be better illustrated 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 component of the switching device.

[0080] Conveniently, the motion drive shaft 3 is 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 a switching device can be implemented using known types of solutions. Therefore, for the sake of brevity, only aspects of the present invention will be described below.

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

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

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

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

[0088] More preferably, as illustrated in the accompanying drawings ( Figure 2 and Figure 5 As shown in the figure, the support housing 9 and the motion transmission shaft 3 are integrated.

[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 and the second main contact member 15 protrude from opposite sides of the supporting housing 9, facing the opposite walls of 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 of the insulating housing 4.

[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 firmly coupled to the support housing 9 so that they can rotate together with the latter about the rotation axis 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 attached image ( Figure 2 and Figure 5 As shown, preferably, each main contact member 15, 16 is formed of a conductive material molded part including a pair of parallel blades having a suitable free contact surface for other electrical contacts.

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

[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 can be coupled or decoupled from the fourth fixed contact member 8, while the second main contact member 16 can be coupled or decoupled from the second fixed contact member 6, or 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 a pair of arc contact members housed in the vacuum chamber and capable of being coupled or decoupled from each other.

[0098] Specifically, this arc contact component includes a fixed arc contact component 17 and a movable arc contact component 18.

[0099] According to the embodiment shown in the accompanying drawings, 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 firmly 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] As shown in the attached image ( Figure 3 and Figure 6 As shown, the fixed arc contact member 17 is preferably formed of an elongated piece of conductive material having one end coupled to a first connecting member 170 (e.g., formed by a bolt) and a relatively free end (e.g., T-shaped) including a suitable contact surface with the movable arc contact member 18, the first connecting member 170 being sequentially coupled to the first main contact member 15.

[0103] However, in principle, the fixed arc contact component 17 can be implemented according to other known solutions (e.g., with blade configurations), which are not 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 is movable 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 slidably 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 molded part of a conductive material having one end coupled to the second connecting member 180 and a relatively free end (e.g., T-shaped) including a suitable contact surface with the 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 couples the blades of the second main contact member 16. In this way, the movable arc contact member 18 can move along the translation axis A2 together with each blade, while rotating about the rotation axis A1 together with the movable contact assembly 10.

[0109] As shown in the accompanying drawings, the connecting member 180 is preferably formed of a molded part of a conductive material having a portion formed by bolts coupled to the movable arc contact member 18 and another portion including 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 solutions of known types (e.g., depending on the configuration), which are not described in detail here for the sake of brevity.

[0111] As mentioned above, each movable contact assembly 10 of the 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 such that the contact surfaces of the arc contact components 17 and 18 are coupled or decoupled from each other within the vacuum chamber, and are thus permanently immersed in the vacuum atmosphere.

[0113] The vacuum chamber 14 can be implemented according to known types of solutions. Therefore, for the sake of brevity, only aspects of the 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 in the following states:

[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, as well as a ground terminal 13. When the switching device is in the open state, no current can flow along the electrode 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, no line current can flow along the electrode 2. However, the second electrode terminal 12 of each electrode (and therefore the second wire conductor connected to it) is subjected to a ground voltage.

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

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

[0121] - The disconnection action when switching from a closed state to an open state; or

[0122] - The closing action when switching from the open state to the closed state; or

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

[0124] - The 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 a disconnection action and a subsequent disconnection action.

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

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

[0128] Typically, when actuated by the motion drive shaft 3, the movable contact assembly 10 of each electrode can be in 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 positions, the movable contact assembly 10 passes through the intermediate position P corresponding to the open state of the switching device. B ( Figures 8 to 16 ).

[0130] When the movable contact assembly 10 is in the first end-of-operation position P AWhen 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 middle position P B Furthermore, when the switching device is in the open state, the first main contact member 15 is decoupled from the first fixed contact member 5 and the third fixed contact member 8, and the second main contact member 16 is decoupled from the second fixed contact member 6 and the third fixed contact member 7. Preferably, 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.

[0132] 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.

[0133] According to one aspect of the invention, each electrode 2 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 and slidably coupled to the track surface 21 of the corresponding track member 20 and a movable arc contact member 18.

[0134] 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 ).

[0135] 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, which are slidably coupled to the track surface 21 of the corresponding track member 20.

[0136] Each track component 20 can be fixed to the insulating housing 4 or an integrated part of the latter.

[0137] 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, conveniently having a curved shape.

[0138] Preferably, the track surface 21 of each track member 20 is arranged at the outer edge of the latter, 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.

[0139] Preferably, each drive member 22 is formed of a roller arranged in such a way that it runs along the track surface 21 of the corresponding track member 20.

[0140] In the embodiment shown in the accompanying drawings, each drive member 22 is slidably coupled to the second main contact member 16.

[0141] Preferably, each drive member 22 is arranged outside the corresponding blade of the second main contact member 16, and each drive member 22 is coupled to the movable arc contact member 18 via the aforementioned connecting pin 220 and connecting member 180.

[0142] In the embodiment shown in the accompanying drawings, the 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 constant negative pressure applied to the movable arc contact member 18 (and guided to move the latter toward the fixed arc contact member 17), since the movable arc contact member 18 is housed in the vacuum chamber 14.

[0143] However, according to other embodiments of the invention, the permanent contact between the drive member 22 and the track surface 21 can also be ensured in different additional ways, for example by appropriately arranging a restricted track groove in which the drive member 22 can slide.

[0144] Conveniently, as the movable contact assembly 10 (and therefore the movable arc contact 18) rotates about the axis of rotation A1, each drive member 22 slides along the track surface 21 of the corresponding track member 20.

[0145] In this way, when the movable contact assembly 10 is in the first end-of-operation position P A At that time, the driving component 22 is in the first position T along the track surface 21. A ( Figure 8 When 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 ).

[0146] Second position T BObviously in the first position T A and the third position T C In the middle.

[0147] In the embodiment shown in the accompanying drawings, 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.

[0148] As each drive member 22 slides along the corresponding track surface 21 (following a 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 of the fixed arc contact member, because the track surface has a cam profile.

[0149] Preferably, the track surface 21 is shaped such that when the drive member 22 is in a first position T along the track surface 21 A Or the second position T B Or the third position T C At that time, the movable arc contact member 18 is actuated at the coupling position with the fixed arc contact member 17.

[0150] 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.

[0151] 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 and a decoupled position with the fixed arc contact member 17.

[0152] Specifically, when the drive member 22 slides along the first track surface portion 21A, the first track surface portion 21A is shaped such that 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.

[0153] Therefore, referring 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 BThe 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.

[0154] 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.

[0155] 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 and a decoupled position with the fixed arc contact member 17.

[0156] Specifically, when the drive member 22 slides along the second track surface portion 21B, the second track surface portion 21B is shaped such that 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.

[0157] Therefore, referring to Figures 8 to 16 The observation plane, the second track surface portion 21B includes the second position T respectively. B Second position T C The fourth and fifth surface segments, which are bent toward the fixed arc contact member 17, and the sixth surface segment, which is bent away from the fixed arc contact member 17 between the fourth and fifth surface segments.

[0158] According to the present invention, the movable contact assembly 10 of each electrode 2 includes a cam mechanism 25 coupled to the movable arc contact member 18.

[0159] When the movable arc contact component 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 suitable for pressing the movable arc contact member 18 against the fixed arc contact member 17.

[0160] 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 along a 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.

[0161] Preferably, the pushing member 26 is formed by a sleeve arranged coaxially with the connecting member 180 along the longitudinal axis A2.

[0162] Preferably, the spring member 27 is formed of a compression spring arranged along the longitudinal axis A2 and having an end coupled to the coupling surface of the connecting member 180 and an opposite end coupled to the coupling surface of the pushing member 26.

[0163] 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.

[0164] When the movable contact assembly 10 is in the first operation end position P A Or the second run end position P C At this time, the slider component 28 can be coupled to one or more first cam surfaces 31 or one or more second cam surfaces 32.

[0165] 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, which is directed to cause compression of the spring member 27 and consequently, compression of the fixed arc contact member 17 by the movable arc contact member 18.

[0166] 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 ).

[0167] 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 the slider member 28 can move relative to the latter along the translation axis A2.

[0168] Preferably, the first clamping member 310 can be fixed to the second fixed contact member 6, conveniently secured between the latter's parallel blades. Alternatively, the first clamping member 310 can be integrally implemented with the second fixed contact member 6.

[0169] The first clamping component 310 includes one or more first cam surfaces 31 ( Figure 3 and Figure 4 Similarly ( Figure 3 The second clamping member 320 can be fixed to the third fixed contact member 7, conveniently secured between the latter's parallel blades. Alternatively, the second clamping member 320 can be integrally implemented with the third fixed contact member 7. The second clamping member 320 includes one or more second cam surfaces 32.

[0170] 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.

[0171] The operation reference of the cam mechanism 25 included in the general electrode 2 designed according to the above embodiment is as follows: Figure 4 , Figure 4A , Figure 4B Brief illustration.

[0172] The movable contact assembly 10 should be at the aforementioned first end-of-operation position P. A It moves nearby because it occurs during the opening or closing action of the switching device.

[0173] Figure 4 The diagram illustrates the situation when the movable contact assembly 10 is in the first end-of-operation position P. A And the cam mechanism 25 when the switch is in the closed state.

[0174] When the movable contact assembly 10 is in the first end-of-operation position P A At this time, the second main contact member 16 is coupled to the second fixed contact member 6, and the movable arc contact member 18 is coupled to the fixed arc contact member 17. In this case, the slider member 28 is fully coupled to the first cam surface 31 and applies maximum actuating force to the push member 26. The latter compresses the spring member 27, which in turn presses the movable arc contact member 18 against the fixed arc contact member 17.

[0175] During the disconnection operation of the switching device, the movable contact assembly 10 moves away from the first end-of-operation position P. A (Direction R1) moves. The second main contact member 16 thus moves away from the second fixed contact member 6.

[0176] As the second main contact member 16 begins to move, the slider member 28 slides along the first cam surface 31 and gradually decouples from it. In this way, the spring member 27 is gradually released, and the movable arc contact member 18 no longer presses against the fixed contact member 17. Figure 4A ).

[0177] As the movable contact assembly 10 moves further, the slider member 28 continues to slide along the first cam surface 31 until the slider member 28 is decoupled from the first cam surface 31. Figure 4B Spring member 27 is released, and cam mechanism 25 is no longer in operation.

[0178] During the closing action of the switching device, the movable contact assembly 10 moves toward the first end-of-operation position P. A(Direction R2) moves. The second main contact member 16 therefore moves toward the second fixed contact member 6.

[0179] When the second main contact member 16 moves toward the second fixed contact member 6, the slider member 28 contacts the first cam surface 31 near the second fixed contact member 6. Figure 4B ).

[0180] As the movable contact assembly 10 moves further, the slider member 28 continues to slide along the first cam surface 31, and an increased actuating force is applied to the actuating member 26. Figure 4A Therefore, the spring member 27 is gradually compressed.

[0181] When the movable contact assembly 10 reaches the first end-of-operation position P A At this time, the spring member 27 reaches maximum compression. The movable arc contact member 18 is thus pressed against the fixed arc contact member 17.

[0182] When the movable contact assembly 10 moves to the aforementioned second end-of-operation position P C When in the vicinity, the cam mechanism 25 operates in the same manner as during the disconnection or reconnection operation of the switching device. In this case, the slider member 28 interacts with the second cam surface 32 arranged near the second and third fixed contact members 7.

[0183] When the arc contact components 17 and 18 are decoupled from each other during various operations of the switching device, or when the movable contact assembly 10 moves to the aforementioned intermediate position P. B When the cam mechanism 25 is nearby, it does not operate at all. In these situations, the slider member 28 cannot interact with any cam surface. Therefore, the spring member 27 remains in the released state.

[0184] Other embodiments of the present invention ( Figures 5 to 7 When the movable contact assembly 10 is in the first operation end position P A Or the second run end position P C At the same time, the cam mechanism 25 includes a lever member 29, which includes one or more first lever surfaces 291 coupled to the push member 26 and one or more second lever surfaces 292 that can be coupled to one or more first sliding surfaces 33 or one or more second sliding surfaces 34.

[0185] 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, which is directed to cause compression of the spring member 27 and consequently, compression of the fixed arc contact member 17 by the movable arc contact member 18.

[0186] The lever member 29 is preferably firmly coupled to the movable arc contact member 18 (more specifically to the second connecting member 180).

[0187] 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.

[0188] Preferably, the third clamping member 331 supporting the first roller 332 is fixed to the second fixed contact member 6 between the latter's parallel blades. The first roller 332 includes one or more first sliding surfaces 33 for the lever member 29. Figure 6 and Figure 7 ).

[0189] Similarly ( Figure 6 The fourth clamping member 334 supporting the second roller 342 is fixed to the third fixed contact member 7 between the parallel blades of the latter. The second roller 334 includes one or more second sliding surfaces 34 for the lever member 29.

[0190] Depending on possible variations, the first cam surface 31 and the second cam surface 32 may be provided by rollers that are appropriately coupled to the clamping member, which is firmly coupled to or integrally formed with the insulating housing 4.

[0191] The operation reference of the cam mechanism 25 included in the general electrode 2 designed according to the above embodiment is as follows: Figure 7 , Figure 7A , Figure 7B Brief illustration.

[0192] The movable contact assembly 10 should be at the aforementioned first end-of-operation position P. A It moves nearby because it occurs during the opening or closing action of the switching device.

[0193] Figure 7 The diagram illustrates the situation when the movable contact assembly 10 is in the first end-of-operation position P. A And the cam mechanism 25 when the switch is in the closed state.

[0194] When the movable contact assembly 10 is in the first end-of-operation position P AAt this time, the second main contact member 16 is coupled to the second fixed contact member 6, and the movable arc contact member 18 is coupled to and pressed against the fixed arc contact member 17. In this case, the lever member 29 has a second lever surface 292 coupled to the first sliding surface 33 and applies an actuating force to the push member 26. The latter compresses the spring member 27, which in turn presses the movable arc contact member 18 against the fixed arc contact member 17.

[0195] During the disconnection operation of the switching device, the movable contact assembly 10 moves away from the first end-of-operation position P. A (Direction R1) moves. The second main contact member 16 thus moves away from the second fixed contact member 6.

[0196] When the second main contact member 16 begins to move, the second lever surface 292 of the lever member 29 slides along the first sliding surface 33 and gradually decouples from the first sliding surface 33. In this way, the spring member 27 is gradually released, and the movable arc contact member 18 no longer presses against the fixed contact member 17. Figure 7A ).

[0197] As the movable contact assembly 10 moves further, the second lever surface 292 of the lever member 29 continues to slide along the first sliding surface 33 until the second lever surface 292 of the lever member 29 is decoupled from the first sliding surface 33. Figure 7B Spring member 27 is released, and cam mechanism 25 is no longer in operation.

[0198] During the closing action of the switching device, the movable contact assembly 10 moves toward the first end-of-operation position P. A (Direction R2) moves. The second main contact member 16 therefore moves toward the second fixed contact member 6.

[0199] When the second main contact member 16 moves toward the second fixed contact member 6, the second lever surface 292 of the lever member 29 contacts the first cam surface 31. Figure 7B ).

[0200] As the movable contact assembly 10 moves further, the second lever surface 292 of the lever member 29 continues to slide along the first sliding surface 33, and the lever member 29 applies an increased actuating force to the pushing member 26. Figure 4A Therefore, the spring member 27 is gradually compressed.

[0201] When the movable contact assembly 10 reaches the first end-of-operation position P A At this time, the spring member 27 reaches maximum compression. The movable arc contact member 18 is thus pressed against the fixed arc contact member 17.

[0202] When the movable contact assembly 10 moves to the aforementioned second end-of-operation position P C When in the vicinity, the cam mechanism 25 operates in the same manner as during the disconnection or reconnection of the switching device. In this case, the first lever surface 291 of the lever member 29 interacts with the aforementioned second sliding surface 34 arranged near the second and third fixed contact members 7.

[0203] Furthermore, in this case, when the arc contact members 17 and 18 are decoupled from each other during various operations of the switching device, or when the movable contact assembly 10 moves to the aforementioned intermediate position P. B When the cam mechanism 25 is nearby, it does not operate at all. In these cases, in fact, the lever surfaces 291, 292 of the lever member 29 cannot interact with any cam surface. Therefore, the spring member 27 remains in the released state.

[0204] The operation of the switching device 1 for each electrode 2 is now specifically referred to Figures 5 to 7 The embodiments of the present invention are described in more detail below. Switching device 1 in... Figures 2 to 4 The same applies to the embodiments.

[0205] Closed state of the switching device

[0206] When the switching device is in the closed state, each electrode 2 is in Figure 8 The operating conditions are shown in the diagram.

[0207] In this case, in each electrode 2:

[0208] - The movable contact assembly 10 is in the first end-of-operation position P A ;

[0209] - The first main contact member 15 is coupled to the first fixed contact member 5;

[0210] - The second main contact member 16 is coupled to the second fixed contact member 6;

[0211] - The movable arc contact component 18 is coupled to the fixed arc contact component 17;

[0212] - The cam mechanism 25 presses the movable arc contact member 18 against the fixed arc contact member 17;

[0213] - Each guide member 22 is positioned at a first position T along the track surface 21 of the corresponding track element 20. A .

[0214] When electrode 2 is under these operating conditions, 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.

[0215] Open state of the switching device

[0216] When the switching device is in the open state, each electrode 2 is in Figure 12 The operating conditions are shown in the diagram.

[0217] In this case, in each electrode 2:

[0218] - The movable contact assembly 10 is in the middle position P B ;

[0219] - The first main contact component 15 is decoupled from the first fixed contact component 5 and the fourth fixed contact component 8;

[0220] - The second main contact component 16 is decoupled from the second fixed contact component 6 and the third fixed contact component 7;

[0221] - The movable arc contact component 18 is coupled to the fixed arc contact component 17;

[0222] - Cam mechanism 25 is not in operation;

[0223] - Each guide member 22 is located at a second position T along the track surface 21 of the corresponding track element 20. B .

[0224] When electrode 2 is under these operating conditions, no current flows between the first electrode terminal 11 and the second electrode terminal 12.

[0225] Grounding status of switching device

[0226] When the switching device is in the grounded state, each electrode 2 is in Figure 16 The operating conditions are shown in the diagram.

[0227] In this case, in each electrode 2:

[0228] - The movable contact assembly 10 is in the second end-of-operation position P C ;

[0229] - The first main contact member 15 is coupled to the fourth fixed contact member 8;

[0230] - The second main contact component 16 is coupled to the third fixed contact component 7;

[0231] - The movable arc contact component 18 is coupled to the fixed arc contact component 17;

[0232] - The cam mechanism 25 presses the movable arc contact member 18 against the fixed arc contact member 17;

[0233] - Each guide member 22 is located at a third position T along the track surface 21 of the corresponding track element 20. C .

[0234] When electrode 2 is under these operating conditions, no line current flows between the first electrode terminal 11 and the second electrode terminal 12, and the second electrode terminal 12 is grounded.

[0235] Disconnect action

[0236] The switching device 1 performs a disconnection action when switching from the closed state to the open state.

[0237] Initially, each electrode 2 is therefore in Figure 8 Operating conditions.

[0238] 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.

[0239] 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.

[0240] When the second main contact member 16 begins to move according to 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.

[0241] Therefore, 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.

[0242] 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.

[0243] During this phase of the disconnection action ( Figure 9The 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 arcing occurs between the decoupled electrical contacts.

[0244] As the movable contact assembly 10 moves further, the guide member 22 continues to slide along the first track surface portion 21A (especially along the first segment of the latter), thereby moving towards the second position T. B move( Figure 10 The movable arc contact member 18 is gradually decoupled from the fixed arc contact member 17. The first track surface portion 21A is conveniently shaped such that the movable arc contact member 18 is decoupled from the fixed arc contact member 17, while the first main contact member and the second main contact member 15 are still coupled to the first fixed contact member 5 and the second fixed contact member 6. In this way, any arcing phenomena that may occur due to the gradual interruption of the current flowing along the electrodes occur only inside the vacuum chamber 14. During this phase of the disconnection action, the lever member 29 is decoupled from the first sliding surface 33. The cam mechanism 25 ceases operation and the spring member 27 is released.

[0245] As the movable contact assembly 10 moves further, the guide member 22 continues to slide along the first track surface portion 21A (especially along the third segment of the latter), thereby moving towards the second position T. B move( Figure 11 ).

[0246] 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 arcing between the decoupled contacts during this phase of the disconnection operation.

[0247] During this disengagement phase, the cam mechanism 25 is not in operation and the spring member 27 is released.

[0248] As the movable contact assembly 10 moves further, the guide member 22 continues to slide along the first track surface portion 21A (especially along the second segment of the latter), and when the movable contact assembly 10 reaches the intermediate position P... B At that time, the guide component 22 reaches the second position P. B ( Figure 12 ).

[0249] 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.

[0250] In this final stage of the disconnection action, the cam mechanism 25 is not operated and the spring member 27 is released.

[0251] Switch 1 is currently in the off state.

[0252] Closing action

[0253] The switching device 1 performs a closing action when switching from the open state to the closed state.

[0254] Initially, each electrode 2 is therefore in Figure 12 Operating conditions.

[0255] 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.

[0256] 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.

[0257] When the second main contact member 16 begins to move according to 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 (especially along the second segment of the latter). B Towards the first position T A Movable. The movable arc contact component 18 is therefore gradually decoupled from the fixed arc contact component 17. Figure 11 ).

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

[0259] As the movable contact assembly 10 moves further, the guide member 22 continues to slide along the first track surface portion 21A (especially along the third segment of the latter), thereby moving towards the first position T. A move( Figure 10 ).

[0260] 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 are gradually coupled to the first fixed contact component 5 and the second fixed contact component 6, respectively.

[0261] During this phase of the closing action, the cam mechanism 25 is not in operation and the spring member 27 remains released.

[0262] As the movable contact assembly 10 moves further, the guide member 22 continues to slide along the first track surface portion 21A (especially along the third and first segments of the latter), thereby moving towards the first position T. A move( Figure 9 ).

[0263] 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.

[0264] Simultaneously, lever member 29 contacts the first sliding surface 33 and begins to apply increased actuating force to push member 26. Figures 5 to 7 ).

[0265] 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.

[0266] Therefore, in both cases, the spring member 27 is gradually compressed.

[0267] As the movable contact assembly 10 moves further, the guide member 22 continues to slide along the first track surface portion 21A (especially along the first segment of the latter), and when the movable contact assembly 10 reaches the closed position P... A At that time, the guide component 22 reaches the first position T. A ( Figure 8 ).

[0268] 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 first fixed contact member 5 and the second fixed contact member 6.

[0269] 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.

[0270] Therefore, in both cases, the spring member 27 reaches its maximum compression, and the movable arc contact member 18 is pressed against the fixed contact member 17.

[0271] Switch 1 is now in the closed state.

[0272] Disconnect action

[0273] Switching device 1 performs a disconnection action when switching from the open state to the ground state.

[0274] Obviously, the switching device must perform the aforementioned disconnection action before it can switch in the disconnected state.

[0275] Initially, each electrode 2 is therefore in Figure 12 Operating conditions.

[0276] 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.

[0277] The first main contact member 15 moves toward the fourth fixed contact member 8, while the second main contact member 16 moves toward the third fixed contact member 7.

[0278] When the second main contact member 16 begins to move according to the first rotation direction R1, the guide member 22 moves away from the second position T by sliding along the second track surface portion 21B (especially along the fourth segment 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 ).

[0279] During this disengagement phase, the cam mechanism 25 is not in operation and the spring member 27 is released.

[0280] As the movable contact assembly 10 moves further, the guide member 22 continues to slide along the second track surface portion 21B (especially along the sixth segment of the latter), thereby moving towards the third position T. C move( Figure 14 ).

[0281] 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.

[0282] During this disengagement phase, the cam mechanism 25 is not in operation and the spring member 27 remains released.

[0283] As the movable contact assembly 10 moves further, the guide member 22 continues to slide along the second track surface portion 21B (especially along the fifth segment of the latter), thereby moving towards the third position T. C move( Figure 15 ).

[0284] 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.

[0285] Simultaneously, lever member 29 contacts the second sliding surface 34 and begins to apply increased actuating force to push member 26. Figures 5 to 7 ).

[0286] 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.

[0287] Therefore, in both cases, the spring member 27 is gradually compressed.

[0288] As the movable contact assembly 10 moves further, the guide member 22 continues to slide along the second track surface portion 21B (especially along the fifth segment of the latter), and when the movable contact assembly 10 reaches the second end-of-run position P... C When reaching the third position T C ( Figure 16 ).

[0289] 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.

[0290] The lever component 29 is fully coupled to the second sliding surface 34.

[0291] Similarly, in Figures 2 to 4 In one embodiment, the slider member 28 is fully coupled to the second cam surface 32.

[0292] Therefore, in both cases, the spring member 27 reaches its maximum compression, and the movable arc contact member 18 is pressed against the fixed contact member 17.

[0293] Switching device 1 is now in the grounded state.

[0294] Reconnection action

[0295] When switching device 1 switches from the grounded state to the disconnected state, it performs a reconnection action.

[0296] Initially, each electrode 2 is therefore in Figure 16 Operating conditions.

[0297] 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.

[0298] 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.

[0299] 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 ).

[0300] Similarly, in Figures 2 to 4 In this embodiment, the slider component 28 is gradually decoupled from the second cam surface 32. Figure 15 ).

[0301] Therefore, 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.

[0302] 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.

[0303] The movable contact assembly 10 is oriented toward the center position P according to the second rotation direction R2. B As it moves further, the guide member 22 continues to slide along the second track surface portion 21B (especially along the fifth and sixth segments of the latter), thereby moving towards the second position T. B move( Figure 14 The movable arc contact component 18 and the fixed arc contact component 17 are gradually decoupled.

[0304] 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 27 ceases operation, and the spring member 27 is released.

[0305] As the movable contact assembly 10 moves further, the guide member 22 continues to slide along the second track surface portion 21B (especially along the fifth segment of the latter), thereby moving towards the second position T. B move( Figure 13 ).

[0306] 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.

[0307] During this disengagement phase, the cam mechanism 25 is not in operation and the spring member 27 is released.

[0308] As the movable contact assembly 10 moves further, the guide member 22 continues to slide along the second track surface portion 21B (especially along the fourth segment 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 .

[0309] 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.

[0310] In this final stage of the reconnection operation, the cam mechanism 25 is inactive and the spring member 27 is released. The switch device 1 is now in the off state.

[0311] The switching device according to the invention can be varied and modified, but it still falls within the scope of the invention.

[0312] According to some embodiments of the invention (not shown), for example, the positions of the fixed and movable arc contact members 17, 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, and 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 position shown in the referenced figures.

[0313] As yet another example, according to other embodiments of the invention (not shown), both arc contact members can be movable. In this case, one or more additional guide members and another cam mechanism will be operatively associated with the first main contact member 15, while one or more additional track elements will be arranged between the first fixed contact member 5 and the fourth contact member 8.

[0314] The switching device according to the present invention has significant advantages over known devices in the prior art.

[0315] In the switching device of the present invention, each electrode 2 is provided with a cam mechanism 25, which is integrated with the main contact member of the movable contact assembly 10 and operatively coupled to the movable contact member 18 housed in the vacuum chamber.

[0316] When the switching device is in the closed or grounded state, the cam mechanism 25 allows the arc contact members 17, 18 housed in the vacuum chamber to be compressed. This will improve the behavior of the switching device if a high current flows along the electrodes for any reason (e.g., due to a fault).

[0317] The switching device of the present invention features a very compact, simple, and robust electrode structure, offering advantages in terms of size optimization. Furthermore, the switching device of the present invention is characterized by a high level of reliability for its intended applications.

[0318] In the switching device of the present invention, the electrical contacts 17, 18, housed within the vacuum chamber 14 of each electrode, are intermittently decoupled 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.

[0319] In the switching device of the present invention, the decoupling between the electrical contacts 17 and 18 in 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. Thus, any possible arcing arising from the interruption of the current flowing along each electrode only forms in a vacuum atmosphere, which allows for improved quenching.

[0320] 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 disconnection process.

[0321] The switching device according to the invention has relatively easy and inexpensive industrial production and field installation.

Claims

1. A switching device (1) for a medium-voltage power system, the switching device comprising one or more electrodes (2). in, For each electrode, the switching device includes: - A first terminal (11), a second terminal (12), and a grounding terminal (13), wherein the first terminal (11) is electrically coupled to a first conductor of the wire, the second terminal (12) is electrically coupled to a second conductor of the wire, and the grounding terminal (13) is electrically coupled to a grounding 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 terminal (11), a second fixed contact member (6) and a third fixed contact member (6, 7) electrically connected to the second 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), depending on the position of the movable contact member when the movable contact member 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), depending on the position of the movable contact member when the movable contact member rotates about the rotation axis (A1); - Vacuum chamber (14), fixed arc contact component (17) and movable arc contact component (18). The movable arc contact member (18) can be coupled to or decoupled from the fixed arc contact member (17) by moving along a translation axis (A2) perpendicular to the rotation axis (A1). The arc contact components (17, 18) are housed within the vacuum chamber. The movable arc contact member (18) can be coupled to or decoupled from the fixed arc contact member (17). Each arc contact component (17, 18) is connected in series to the corresponding main contact component (15, 16). The movable contact assembly is capable of operating around the rotation axis (A1) at a first operational end position (P) corresponding to the closed state of the switching device. A ), corresponding to the second operation end position (P) of the grounding state of the switching device. C ) and the intermediate position corresponding to the open state of the switching device (P) B The first terminal (11) and the second terminal (12) are reversibly movable, wherein the first terminal (11) and the second terminal (12) are electrically disconnected from each other from the ground terminal (13); 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) 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), the drive member (22) actuates the movable arc contact member (18) along the translation axis (A2) between the coupling position and the decoupling position of the fixed arc contact member (17). The movable contact assembly (10) is characterized in that it includes a cam mechanism (25) coupled to the movable arc contact member (18). When the movable arc contact component 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 B When the movable arc contact member (18) is pressed against the fixed arc contact member (17), the cam mechanism is adapted to press the movable arc contact member (18) against the fixed arc contact member (17). Wherein, during the operation of the switching device, the arc contact members (17, 18) are decoupled from each other, or when the movable contact assembly (10) moves to the intermediate position (P) B When the cam mechanism (25) is near the cam, the cam mechanism (25) does not operate.

2. The switching device according to claim 1, 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).

3. The switching device according to claim 2, 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 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), 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 compress the spring member (27) and subsequently press the movable arc contact member (18) against the fixed arc contact member (17).

4. The switching device according to claim 2, 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 the second run end position (P C When the lever member (29) is engaged, it 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 (32), 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).

5. The switching device according to any one of claims 1 to 4, characterized in that, 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.

6. The switching device according to any one of claims 1 to 4, characterized in that, When the movable contact assembly (10) is in the intermediate position (P) B When the first main contact member (15) is decoupled from the first fixed contact member (5) and the fourth fixed contact member (8), the second main contact member (16) is decoupled from the second fixed contact member (6) and the third fixed contact member (7), and the arc contact members (17, 18) are coupled to each other.

7. The switching device according to any one of claims 1 to 4, characterized in 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.

8. The switching device according to claim 1, characterized in that: - 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.

9. The switching device according to claim 8, characterized in that, When at the first position (T) A ) and the second position (T) B When moving between the two positions, the drive member (22) slides along the 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.

10. The switching device according to claim 9, characterized in that, When the driving member (22) is in the first position (T) along the track surface (21) A ) or the second position (T) B ) or the third position (T) C When the movable arc contact member (18) is actuated to the coupling position of the fixed arc contact member (17), the driving member (22) actuates the movable arc contact member (18) to the coupling position of the fixed arc contact member (17). When sliding along the first track surface portion (21A) or the second track surface portion (21B), the driving member (22) actuates the movable arc contact member (18) along the translation axis (A2) between the coupling position and the decoupling position of the fixed arc contact member (17).

11. The switching device according to any one of claims 1 to 4 and 8 to 10, characterized in that, The switching device is a load circuit breaker for medium-voltage power systems.

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