Medium voltage switchgear

Abstract

Embodiments of the present disclosure relate to a medium voltage switchgear comprising one or more poles, wherein for each pole the switchgear comprises: a first pole terminal, a second pole terminal and a ground terminal, the first pole terminal being electrically couplable with a first conductor of an electrical line, the second pole terminal being electrically couplable to a second conductor of the electrical line and the ground terminal being electrically couplable to a ground conductor; a first fixed contact member and a first movable contact member, the first fixed contact member being electrically connected to the first pole terminal, the first movable contact member being electrically connected to the second pole terminal; a second fixed contact member and a second movable contact member, the second fixed contact member being electrically connected to the first pole terminal, the second movable contact member comprising a second movable contact; a vacuum chamber, the second fixed contact and the second movable contact being enclosed in the vacuum chamber and being couplable or decouplable; a motion transmission mechanism for actuating the second movable contact member.

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 are typically used in secondary distribution networks and are capable of providing circuit breaking (i.e., disconnecting and generating current) and circuit disconnection (i.e., grounding the load side portion of the circuit) under specified circuit conditions (typically rated or overload conditions).

[0004] Most conventional load circuit breakers in existing technology immerse their electrodes 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 strictly limited for environmental protection purposes. Therefore, considerable effort has been devoted over the years to developing and designing 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, especially in terms of arc-extinguishing capability.

[0007] For each electrode, other currently available load circuit breakers employ different contact arrangements with parallel electrical connections between the terminals.

[0008] The contact arrangement has electrical contacts that operate in an atmosphere filled with environmentally friendly insulating gas or air, and it is designed to carry most of the current flowing along the electrodes and to drive possible switching operations.

[0009] Conversely, another contact arrangement has electrical contacts that operate in a vacuum atmosphere and are specifically designed to extinguish arcs that occur when the current flowing along the electrodes is interrupted.

[0010] These switching devices have proven to ensure relatively low environmental impact while providing high levels of performance in dielectric insulation and arc extinguishing capabilities. However, until now, they have employed complex solutions to manage and coordinate the operation of the aforementioned multiple contact arrangements. Consequently, they still fall short in terms of structural compactness and operational reliability. Summary of the Invention

[0011] 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.

[0012] More specifically, the 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 a current disconnection process.

[0013] Another object of the present invention is to provide a switching device that exhibits a high level of reliability in operation.

[0014] Another object of the present invention is to provide a switching device with electrodes that are highly compact and simple in structure.

[0015] 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.

[0016] To achieve these objectives and purposes, the present invention provides a switching device according to claim 1 and related dependent claims.

[0017] In a general definition, the switching device of the present invention includes one or more electrodes.

[0018] For each electrode, the switching device includes a first terminal, a second terminal, and a ground terminal. In operation, the first terminal can be electrically coupled to a first conductor of the wire, the second terminal can be electrically coupled to a second conductor of the wire, and the ground terminal can be electrically coupled to a ground conductor.

[0019] For each electrode, the switching device includes a first fixed contact member and a first movable contact member.

[0020] The first fixed contact member is electrically connected to the first terminal and includes the first fixed contact.

[0021] The first movable contact member is electrically connected to the second terminal and includes the first movable contact.

[0022] The first movable contact member can be reversibly moved about a corresponding first rotation axis according to a first rotation direction or according to a second rotation direction, the first rotation direction being away from the first fixed contact and oriented toward the grounding terminal, and the second rotation direction being opposite to the first rotation direction and therefore away from the grounding terminal and oriented toward the first fixed contact.

[0023] Since the first movable contact member can move about the first rotation axis, the first movable contact can be coupled to or decoupled from the first fixed contact, or coupled to or decoupled from the grounding terminal.

[0024] For each electrode, the switching device includes a second fixed contact member and a second movable contact member.

[0025] The second fixed contact component is electrically connected to the first terminal and includes the second fixed contact.

[0026] The second movable contact component includes a second movable contact and is reversibly movable along a corresponding translation axis.

[0027] Because the second movable contact member can move along the aforementioned translation axis, the second movable contact can be coupled to or decoupled from the second fixed contact. Specifically, the second contact member can reversibly move along the aforementioned translation axis between a coupled position and a decoupled position, in which the second movable contact is coupled to the second fixed contact, and in which the second movable contact is decoupled from the second fixed contact.

[0028] For each electrode, the switching device includes a vacuum chamber in which the second fixed contact and the second movable contact are enclosed and coupled or decoupled.

[0029] According to the present invention, the switching device includes a motion transmission mechanism for each electrode for actuating a second movable contact member of the electrode.

[0030] This motion transmission mechanism includes:

[0031] A cam component, movable about a second rotation axis and coupled to a second movable contact member. When the cam component rotates about the second rotation axis, the cam component is adapted to apply an actuating force to the second movable contact member to move the second movable contact member along the translation axis between the first coupled position and the second coupled position. The cam component is conductive and electrically connected to the second movable contact member.

[0032] A first lever arm, coupled to the cam member and extending radially relative to the second axis of rotation, is conductive and electrically connected to the second movable contact member.

[0033] - A second lever arm is coupled to the cam member and extends radially relative to the second axis of rotation and is angularly spaced relative to the first lever arm.

[0034] During the opening or closing operation of the switching device, when the first movable contact member actuates the first lever arm or the second lever arm, the cam member is reversibly movable between a first switching position and a second switching position, the first switching position corresponding to the coupling position of the second movable contact member and the second switching position corresponding to the decoupling position of the second movable contact member.

[0035] According to one aspect of the invention, during the disconnection operation of the switching device, when the first movable contact member moves according to a first rotation direction, the first movable contact member is coupled to a first lever arm and actuates the first lever arm to move the cam member from a first switch position to a second switch position.

[0036] According to one aspect of the invention, during the closing operation of the switching device, when the first movable contact member moves according to the second rotation direction, the first movable contact member is coupled to the second lever arm and actuates the second lever arm to move the cam member from the second switch position to the first switch position.

[0037] According to one aspect of the invention, when the first movable contact member is coupled to the first lever arm, the motion transmission mechanism electrically connects the second movable contact member to the first movable contact member.

[0038] According to one aspect of the invention, the cam member includes one or more coupling surfaces and a second movable contact member. The coupling surfaces have an eccentric profile relative to a second axis of rotation.

[0039] Preferably, the first lever arm is at least partially made of a conductive material.

[0040] Preferably, the first lever arm includes a body and a conductive element, the conductive element being coupled to the body and electrically connected to the cam member, or electrically connected to a conductive portion of the body electrically connected to the cam member. When the first movable contact member is coupled to the first lever arm, the conductive element contacts the first movable contact member.

[0041] Preferably, the second lever arm is made of an electrically insulating material.

[0042] Preferably, the motion transmission mechanism includes a biasing device that facilitates the switching of the cam member to the first switch position or the second switch position when the first lever arm or the second lever arm is actuated by the first movable contact member. Attached Figure Description

[0043] 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, in which:

[0044] - Figures 1 to 4This is a schematic diagram of an embodiment of the switching device according to the present invention;

[0045] - Figure 5 This is a schematic diagram of another embodiment of the switching device according to the present invention; and

[0046] - Figures 6 to 12 This is a schematic diagram illustrating the operation of the switching device according to the present invention. Detailed Implementation

[0047] Referring to the accompanying drawings, the present invention relates to a switching device 1 for a medium-voltage power system.

[0048] For the purposes of this application, the term “medium voltage” (MV) refers to the operating voltage of a distribution level that is higher than 1kV AC and 1.5kV DC up to tens of kV, such as up to 72kV AC and 100kV DC.

[0049] Switching device 1 is particularly suitable for operation as a load circuit breaker. Therefore, it is designed to provide circuit breaking and disconnection functions under specified circuit conditions (rated or overload conditions), especially to ground the load side portion of the circuit.

[0050] The switching device 1 includes one or more electrodes 2.

[0051] Preferably, the switching device 1 is of the multiphase (e.g., three-phase) type and includes multiple (e.g., three) electrodes 2.

[0052] Preferably, the switching device 1 includes an insulating housing 4 that conveniently defines an internal volume in which the electrode 2 is housed.

[0053] Preferably, the insulating housing 4 has a longitudinal axis ( Figure 1 The electrodes 2 are arranged side-by-side along a corresponding transverse plane perpendicular to the main longitudinal axis of the switching device, forming an elongated shape (e.g., a basic cylindrical shape).

[0054] 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 invention will be described below.

[0055] 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.

[0056] For each electrode 2, the switching device 1 includes a first terminal 11, a second terminal 12, and a ground terminal 13.

[0057] The first terminal 11 is adapted to be electrically coupled to the first conductor of the wire (e.g., electrically connected to the phase conductor of the equivalent power source), the second terminal 12 is adapted to be electrically connected to the second conductor of the wire (e.g., electrically connected to the phase conductor of the equivalent electrical load), and the ground terminal 13 is adapted to be electrically connected to the ground conductor.

[0058] 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 the invention will be described below.

[0059] For each electrode 2, the switching device 1 includes a conductive first fixed contact member 5A, which includes at least a first fixed contact 5.

[0060] The first fixed contact member 5A is at least partially made of a conductive material and is electrically connected to the first terminal 11. As shown in the referenced figures, the first fixed contact member 5A can be conveniently formed from an elongated sheet of conductive material having one end coupled to the first terminal 11 and an opposing blade-shaped free end. Figure 4 The free end forms the first fixed contact 5.

[0061] However, in principle, the first fixed contact member 5A can be implemented according to other solutions of known types (e.g., according to a multi-blade configuration including multiple fixed contacts), which will not be described in detail here for the sake of brevity.

[0062] For each electrode 2, the switching device 1 includes a first movable contact member 6A, which includes at least a first movable contact 6.

[0063] The first movable contact member 6A is at least partially made of conductive material and is electrically connected to the second terminal 12.

[0064] The first movable contact member 6A is reversibly movable about a corresponding first rotation axis A1 (along a given plane of rotation), the first rotation axis A1 being substantially parallel to the main longitudinal axis of the switching device.

[0065] The first movable contact member 6A can rotate according to a first rotation direction R1 or a second rotation direction R2. The first rotation direction R1 is away from the first fixed contact 5 and oriented toward the grounding terminal 13. The second rotation direction R2 is opposite to the first rotation direction R1, away from the grounding terminal 13, and oriented toward the first fixed contact 5.

[0066] refer to Figure 2 On the observation plane, the first rotation direction R1 is clockwise, while the second rotation direction R2 is counterclockwise.

[0067] As will be better explained below, the first movable contact member 6A moves according to the first rotation direction R1 during the disconnection or disconnection operation of the switching device, and moves according to the second rotation direction R2 during the closing or reconnection operation of the switching device.

[0068] Since the first movable contact member 6A can move reversibly about the first rotation axis A1, the first movable contact 6 can be coupled to or decoupled from the first fixed contact 5, or the first movable contact 6 can be coupled to or decoupled from the grounding terminal 13.

[0069] As shown in the attached figure ( Figure 4 As shown, the first movable contact member 6A is preferably formed of a pair of conductive material blades. One end of each blade is hinged to the second terminal 12 of the corresponding electrode at the first axis of rotation A1, and the opposite ends form a movable contact 6. In this way, each movable contact 6 can be coupled to or decoupled from the corresponding coupling surface of the blade-shaped portion of the first fixed member 5A to form the first fixed contact 5.

[0070] However, in principle, the first movable contact member 6A can be implemented according to other solutions of known types (e.g., according to a single-blade construction including a single movable contact), which will not be described in detail here for the sake of brevity.

[0071] As can be seen from the following, for each electrode 2, electrical contacts 5 and 6 operate as main electrical contacts. When the switching device is in the closed state or in the initial stage of the open operation, the current IL flowing between the first terminal 11 and the second terminal 12 passes through the main electrical contact.

[0072] Preferably, the switching device 1 includes an actuation component that provides a suitable actuating force to actuate the movable contact member 6A of the electrode. Figure 1 ).

[0073] Preferably, such an actuation assembly includes a motion drive shaft 30 made of an electrically insulating material, which is rotatable about a first rotation axis A1 and coupled to a first movable contact member 6A of the electrode 2.

[0074] The motion drive shaft 30 thus provides rotational mechanical force to actuate the first movable contact member 6A during operation of the switching device.

[0075] As shown in the accompanying drawings, the motion drive shaft 30 may include a suitable coupling seat 30A, in which a first movable contact member 6A is accommodated and securely coupled to the motion drive shaft.

[0076] The actuation assembly 3 preferably includes an actuator 31, which is coupled to the drive shaft 3 via a suitable kinematic chain 32. The actuator 31 may be, for example, a mechanical actuator, an electric motor, or an electromagnetic actuator.

[0077] Typically, the actuation component 3 of the switching device can be implemented using known types of solutions. Therefore, for the sake of brevity, only aspects of the invention will be described below.

[0078] For each electrode 2, the switching device 1 includes a second fixed contact member 8A, which includes at least a second fixed contact 8.

[0079] The second fixed contact member 8A is at least partially made of a conductive material and is electrically connected to the first terminal 11. Preferably, the second fixed contact member 8A is positioned parallel to the first fixed contact member 5A along the same reference plane (e.g., the plane of rotation of the first movable contact member 6A).

[0080] The second fixed contact member 8A is preferably formed of an elongated sheet of conductive material, the elongated sheet having one end coupled to the first terminal 11 and an opposite free end forming the second fixed contact 8.

[0081] However, in principle, the second fixed contact member 8A can be implemented according to other solutions of known types (e.g., multi-blade configuration), which will not be described in detail here for the sake of brevity.

[0082] For each electrode 2, the switching device 1 includes a second movable contact member 9A, which includes at least a second movable contact 9.

[0083] The second movable contact member 9A can be reversibly moved along a corresponding translation axis A, which is preferably parallel to the first fixed contact member 5A and perpendicular to the rotation axis A1 of the first movable contact member 6A along the same reference plane (e.g., the rotation plane of the first movable contact member 6A).

[0084] The second movable contact member 9A is reversibly movable along the displacement axis A, such that the second movable contact 9 can be coupled to or decoupled from the second fixed contact 8. Specifically, the second movable contact member 9A is reversibly movable along the displacement axis A between a coupling position P1 and a decoupling position P2. In the coupling position P1, the second movable contact 9 is coupled to the second fixed contact 8, and in the decoupling position P2, the second movable contact 9 is decoupled from the second fixed contact 8.

[0085] The second movable contact member 9A is preferably formed of an elongated sheet of conductive material, the elongated sheet having one end 90 coupled to another mechanical element 70 and an opposite free end forming the second movable contact 9.

[0086] However, in principle, the second moving contact member 9A can be implemented according to other solutions of known types (e.g., multi-blade configurations), which will not be described in detail here for the sake of brevity.

[0087] As can be seen below, for electrode 2, electrical contacts 8 and 9 operate as shunt contacts, and at least in part during certain instantaneous phases of the disconnection operation of the switching device, the current IL flowing between the first terminal 11 and the second terminal 12 is deflected through the shunt contacts.

[0088] According to the present invention, for each electrode 2, the switching device 1 includes a vacuum chamber 10 in which a vacuum atmosphere exists.

[0089] Conveniently, the second fixed contact 8 and the second movable contact 9 are enclosed within the vacuum chamber 10, and they are coupled or decoupled from each other within the vacuum chamber, thus being permanently immersed in a vacuum atmosphere.

[0090] Vacuum chamber 10 can be implemented according to known types of solutions. Therefore, for the sake of brevity, only aspects of the invention will be described below.

[0091] According to the present invention, for each electrode 2, the switching device 1 includes a motion transmission mechanism 7 for actuating the second movable contact member 9A.

[0092] The motion transmission mechanism 7 includes a cam member 70, which preferably rotates on a fixed support (not shown) (e.g., an insulating housing 4).

[0093] The cam component 70 is reversibly movable about the second rotation axis A2 according to the third rotation direction R3 or the fourth rotation direction R4 opposite to the third rotation direction.

[0094] refer to Figure 2 On the observation plane, the third rotation direction R3 is counterclockwise, while the fourth rotation direction R4 is clockwise.

[0095] A cam member 70 is coupled to a second movable contact member 9A and is arranged such that when the cam member 70 rotates about a second rotation axis A2, the cam member 70 applies an actuating force to the second movable contact member 9A. The actuating force is oriented along a translation axis A and reversibly moves the second movable contact member 9A between the first coupling position P1 and the second coupling position P2.

[0096] According to some embodiments of the present invention, the cam member 70 includes one or more coupling surfaces 70A and a second movable contact member 9A, the one or more coupling surfaces 70A conveniently having an eccentric profile relative to a second rotation axis A2. In this way, when the cam member 70 rotates about the second rotation axis A2, the cam member 70 is capable of moving the second movable contact member 9A along the translation axis A.

[0097] Figure 3 An embodiment of the invention is shown, wherein the cam member 70 includes a pair of parallel disks 701 connected by a coupling pin 702 arranged along a second rotation axis A2 and rotating on the fixed support (not shown).

[0098] Each disk 701 includes a groove 703 having an eccentric profile relative to the second axis of rotation A2 and preferably being arranged near the outer edge of the disk.

[0099] At the free end 90, the second movable contact member 9A includes a pair of pins 90A projecting from opposite sides of the second movable contact member. Each pin 90A is conveniently coupled to a corresponding slot 703 of the disk 701.

[0100] Obviously, the surface of the disk 701 defining the groove 703 forms a coupling surface 70A with the second movable contact member 9A, and the coupling surface 70A conveniently has an eccentric profile relative to the second axis of rotation A2.

[0101] Those skilled in the art will certainly understand that the cam component 70 can be implemented according to various different types of solutions falling within the scope of the present invention.

[0102] As an example, the cam member 70 may include a single disk 701, which, as... Figure 3 The arrangement shown is coupled to a single pin 90A protruding from the free end 90 of the second movable contact member 9A.

[0103] As another example, the cam member 70 may be formed of a solid body having an eccentric shape relative to the second axis of rotation A2.

[0104] As another example, the cam member 70 may include one or more motion transmission elements coupled to the second movable contact member 9A via a suitable crank arm type kinematic chain.

[0105] The cam member 70 is conductive and electrically connected to the second movable contact member 9A.

[0106] Preferably, the cam component 70 is made of one or more shaped conductive materials.

[0107] As an alternative, the cam member 70 may also include a component made of an electrically insulating material, provided that a conductive path toward the second movable contact member 9A is ensured.

[0108] The motion transmission mechanism 7 includes a first lever arm 71 and a second lever arm 72, which are coupled to the cam member 70 and extend radially relative to the second rotation axis A2.

[0109] As shown in the accompanying drawings, each lever arm 71, 72 is formed of an elongated piece of material having a coupling end 711, 721 coupled to the cam member 70 and a corresponding free end 712, 722 located distal to the cam member.

[0110] refer to Figure 3 In the embodiment shown, lever arms 71, 72 have coupling ends 711, 721 (preferably having complementary shapes) of an additional coupling pin 705 coupled to the cam member 70, which connects the parallel disc 701 near the outer edge of these coupling ends 711, 721.

[0111] The additional coupling pin 705 is conveniently arranged along an axis parallel to the second rotation axis A2.

[0112] As an alternative, lever arms 71 and 72 may have coupling ends 711 and 721 that are directly linked to coupling pins 702 of cam member 70.

[0113] Conveniently, the first lever arm 71 and the second lever arm 72 are spaced apart from each other at an angle, for example, an angle of 90° measured on a reference plane perpendicular to the second axis of rotation A2.

[0114] Conveniently, the first lever arm 71 is conductive and electrically connected to the cam member 70. In this way, an electrical path is ensured from the first lever arm 71 to the second movable contact member 9A, which passes through the cam member 70.

[0115] According to some embodiments of the present invention, the first lever arm 71 is made of a conductive material.

[0116] As an alternative, the first lever arm 71 may also include a component made of an electrically insulating material, provided that a conductive path toward the cam member 70 is ensured.

[0117] Other embodiments of the present invention ( Figure 5 The first lever arm 71 includes a body 713 and a conductive element 714 coupled to the body, preferably protruding from the body.

[0118] The conductive element 714 is electrically connected to the cam member 70 (e.g., an additional coupling pin 705) or to a conductive portion of the body 713, which in turn is electrically connected to the cam member 70.

[0119] The conductive element 714 is conveniently arranged such that when the first movable contact member 6A is coupled to the first lever arm 71, the conductive element 714 contacts the first movable contact member 6A.

[0120] In this way, when the first movable contact member 6A is coupled to the first lever arm 71, a conductive path through the first lever arm 71 and the cam member 70 is ensured between the first movable contact member 6A and the second movable contact member 9A.

[0121] Preferably, the conductive element 714 is made of a leaf spring having a free end and an opposite end, which is linked to another conductive portion of the cam member 70 or the first lever arm 71.

[0122] This solution is highly advantageous because it ensures a soft coupling between the first movable contact member 6A and the first lever arm 71 during operation of the switching device, while simultaneously ensuring electrical connection with the second movable contact member 9A.

[0123] Since the conductive element 76 ensures the existence of a conductive path toward the cam member 70, the body 713 of the first lever arm 71 can be integrally made of an electrically insulating material according to these embodiments of the invention.

[0124] However, in these embodiments of the invention, the first lever arm 71 may still be made at least partially of a conductive material, as described above.

[0125] Preferably, the second lever arm 72 is made of an electrically insulating material.

[0126] According to the present invention, the cam member 70 is movable between a first switch position S1 and a second switch position S2, the first switch position S1 corresponding to the coupling position P1 of the second movable contact member 9A, and the second switch position S2 corresponding to the decoupling position P2 of the second movable contact member 9A.

[0127] The switching of the cam member 70 to the first switch position S1 or the second switch position S2 occurs during the opening or closing operation of the switching device when the first movable contact member 6A actuates the first lever arm 71 or the second lever arm 72.

[0128] According to a preferred embodiment of the present invention, during the disconnection operation of the switching device, when the first movable contact member 6A moves according to the first rotation direction R1, the first movable contact member 6A is coupled to the first lever arm 71 and actuates the first lever arm 71 to move the cam member 70 from the first switch position S1 to the second switch position S2 according to the third rotation direction R3.

[0129] Since the first electric arm 71 is conductive and electrically connected to the cam member 70, and the cam member 70 is in turn conductive and electrically connected to the second movable contact member 9A, when the first movable contact member 6A is coupled to the first lever arm 71, the motion transmission mechanism 7 electrically connects the second movable contact member 9A to the first movable contact member 6A.

[0130] Conveniently, during the closing operation of the switching device, when the first movable contact member moves according to the second rotation direction R2, the first movable contact member 6A is coupled to the second lever arm 72 and actuates the second lever arm 72 to move the cam member 70 from the second switch position S2 to the first switch position S1 according to the fourth rotation direction R4.

[0131] In this case, for example, due to the fact that the second electric arm 72 is preferably made of an electrically insulating material, when the first movable contact member 6A is coupled to the second lever arm 72, the motion transmission mechanism 7 provides current isolation between the second movable contact member 9A and the first movable contact member 6A.

[0132] Preferably, the motion transmission mechanism 7 includes a biasing device 75, which is used to facilitate the switching of the cam member 70 to the first switch position S1 or the second switch position S2 when the first lever arm 71 or the second lever arm 72 is actuated by the first movable contact member 6A.

[0133] Conveniently, during the disconnection of the switching device, the biasing device 75 cooperates with the first movable contact member 6A to actuate the first lever arm 71, while the cam member 70 moves from the first switch position S1 to the second switch position S2 according to the third rotation direction R3.

[0134] Similarly, during the closing operation of the switching device, the biasing device 75 cooperates with the first movable contact member 6A to actuate the second lever arm 72, while the cam member 70 moves from the second switch position S2 to the first switch position S1 according to the fourth rotation direction R4.

[0135] According to some embodiments of the invention, the biasing device 75 may be of a mechanical type. In this case ( Figure 3These may include one or more insulating springs (e.g., insulating housing 4 or first fixed contact member) coupled to the cam member 70 (e.g., at coupling pin 702) and the fixed support.

[0136] As an alternative (not shown), the biasing device 75 may include one or more first insulating springs coupled to the first lever arm 71 and the first fixed support, and one or more second insulating springs coupled to the second lever arm 72 and the second fixed support.

[0137] According to other embodiments of the invention (not shown), the biasing devices 75 may be magnetic. In this case, they may include one or more first magnetic elements coupled to the first lever arm 71 and the first fixed support, and one or more second magnetic elements coupled to the second lever arm 72 and the second fixed support.

[0138] According to the present invention, during operation, the switching device 1 can switch between three different operating states.

[0139] Specifically, the switching device 1 can be switched to:

[0140] - Closed state, in which each electrode 2 has a first terminal 11 and a second terminal 12 electrically connected to each other and electrically disconnected from the ground terminal 13. When the switching device is in the closed state, current can flow along each electrode 2 between the corresponding first terminal 11 and second terminal 12; or

[0141] - In the open state, each electrode 2 has a first terminal 11 and a second 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 flows along the electrode 2; or

[0142] - In the grounded state, each electrode 2 has a first terminal 11 and a second terminal 12 that are electrically disconnected from each other, and a second terminal 12 and a ground terminal 13 that are electrically connected to each other. When the switching device is in the grounded state, no current can flow along the electrode 2. In addition, the second terminal 12 of each electrode (and therefore the second line conductor connected to it) is placed at the ground voltage.

[0143] In operation, the switching device 1 can perform different types of operations, each operation corresponding to a given transition between the above-mentioned operating states.

[0144] Specifically, the switching device 1 is capable of performing:

[0145] - The disconnect operation when switching from a closed state to an open state; or

[0146] - The closing operation when switching from an open state to a closed state; or

[0147] - The disconnection operation when switching from the disconnected state to the grounded state; or

[0148] - Reconnection operation when switching from grounded state to disconnected state.

[0149] The switching device 1 can switch from a closed state to a grounded state by performing a disconnection operation and a subsequent disconnection operation.

[0150] Similarly, the switching device 1 can switch from the grounded state to the closed state by performing a reconnection operation and a subsequent closing operation.

[0151] In order to perform the aforementioned operation of the switching device, the aforementioned motion transmission shaft 30 appropriately drives the first movable contact member 6A of each electrode according to the aforementioned first rotation direction R1 or second rotation direction R2.

[0152] Generally, when actuated by the drive shaft 52, the first movable contact member 6A of each electrode can be in the first end-of-operation position P. A With the second run end position P C Reversible movement between them, the first running end position P A Corresponding to the closed state of the switching device, the second operation end position P C This corresponds to the grounding state of the switching device.

[0153] Conveniently, when the first motion transmission component is at the first end position P of the operation A With the second run end position P C ( Figures 6 to 12 When moving between the two positions, the first motion transmission component passes through the intermediate position P. B The middle position P B This corresponds to the open state of the switching device.

[0154] The operation of the switching device 1 for each electrode 2 will now be described in more detail.

[0155] Closed state of the switching device

[0156] When the switching device is in the closed state, each electrode 2 is in Figure 6 The operating state shown is (first stable state C1).

[0157] In this situation, the first movable contact member 6A is in the first operation end position P. A The first movable contact 6 is coupled to the first fixed contact 5 and the second movable contact 9 is in the coupling position P1, that is, coupled to the second fixed contact 8.

[0158] The cam component 70 is in the first switch position S1, and the first lever arm 71 and the second lever arm 72 are decoupled from the first movable contact component 6A.

[0159] The first lever arm 71 is positioned such that when the first movable contact member 6A moves away from the first fixed contact member 5A by rotating along the first rotation direction R1, the first lever arm 71 is actuated by the first movable contact member 6A. In practice, when the first movable contact member 6A moves away from the first end-of-operation position P... A At that time, the first lever arm 71 is positioned along the movement trajectory of the first movable contact member 6A.

[0160] When electrode 2 is in the first stable state C1, current IL can flow between the first terminal 11 and the second terminal 12 through the main contacts 5 and 6. No current flows through the shunt contacts 8 and 9.

[0161] Open state of the switching device

[0162] When the switching device is in the open state, each electrode 2 is in Figure 9 The state shown is the second stable state C2.

[0163] At this time, the first movable contact member 6A is in the middle position P. B The first movable contact 6 is decoupled from the first fixed contact 5, and the second movable contact 9 is in the decoupled position P2, that is, decoupled from the second fixed contact 8.

[0164] The cam member 70 is in the second switch position S2, and the first lever arm 71 and the second lever arm 72 are decoupled from the first movable contact member 6A.

[0165] When electrode 2 is in the second stable state C2, no current flows along electrode 2 between the first terminal 11 and the second terminal 12.

[0166] Grounding status of switching device

[0167] When the switching device is in the grounded state, each electrode 2 is in Figure 10 The state shown is the third stable state C3.

[0168] In this situation, the first movable contact member 6A is in the second operation end position P. B The first movable contact 6 is decoupled from the first fixed contact 5 and coupled to the ground terminal 13, and the second movable contact 9 is in the decoupled position P2, that is, decoupled from the second fixed contact 8.

[0169] The cam member 70 is in the second switch position S2, and the first lever arm 71 and the second lever arm 72 are decoupled from the first movable contact member 6A.

[0170] The first movable contact member 6A electrically connects the end piece 12 to the grounding terminal 13.

[0171] When electrode 2 is in the third stable state C3, no current flows along electrode 2 between the first terminal 11 and the second terminal 12, and the second terminal 12 is placed at ground voltage.

[0172] Disconnect operation

[0173] Switching device 1 performs a disconnection operation when switching from a closed state to an open state. Therefore, initially, each electrode 2 is in the first stable state C1. Figure 6 ).

[0174] During the disconnection operation of the switching device, the first movable contact member 6A is in the first operation end position P according to the first rotation direction R1. A With the middle position P B The first movable contact member 6A moves away from the corresponding first fixed contact member 5A.

[0175] When the first movable contact member 6A begins to move according to the first rotation direction R1, the first movable contact 6 begins to decouple from the first fixed contact 5.

[0176] However, the first lever arm 71 moves toward the middle position P B The trajectory of motion is positioned such that, during the initial movement, the first movable contact member 6A is coupled to the first lever arm 71 before the first movable contact 6 is completely decoupled from the first fixed contact 5.

[0177] During this phase of the disconnection operation, during the initial movement of the first movable contact member 6A, each electrode 2 thus moves from the first stable state C1 ( Figure 6 Switch to the first instantaneous state C11 ( Figure 7 In the first instantaneous state C11, the first movable contact 6 is still coupled to the first fixed contact 5, the second movable contact 9 is in the coupling position P1, that is, coupled to the second fixed contact 8, and the first lever arm 71 is coupled to the movable contact member 6A. In this case, the first lever arm 71 and the cam member 70 electrically connect the first movable contact member 6A to the second movable contact member 9A (and thus connect the first movable contact 6 to the second movable contact 9 and the second fixed contact 5).

[0178] When electrode 2 is in the first instantaneous state C11, the current IL initially flowing along the electrode is partially deflected to the shunt contacts 8 and 9, and it can flow in parallel between the first terminal 11 and the second terminal 12 through the main contacts 5 and 6 and the shunt contacts 8 and 9. Clearly, most of the current will flow along the main contacts 5 and 6 because such an electrical path has a lower equivalent resistance due to the larger size of contact members 5A and 6A relative to contact members 8A and 9A.

[0179] When the first movable contact member 6A is coupled to the first contact arm 71, the first movable contact member 6A begins to actuate the first contact arm 71 and moves the cam member 70 away from the first switch position S1 and toward the second switch position S2 according to the third rotation direction R3.

[0180] When facing the middle position P B Upon further movement, the first movable contact 6 is completely decoupled from the first fixed contact 5 according to the first rotation direction R1. Simultaneously, the first movable contact member 6A continues to actuate the first lever arm 71, causing the cam member 70 to move away from the first switching position S1 and towards the second switching position S2. In this case, the coupling lever arm 7 applies an actuating force to the second movable contact member 9A, which is intended to move the second movable contact member 9A away from the second fixed contact member 8A (in the first translation direction D1).

[0181] During this disconnection phase, each electrode 2 reaches the second instantaneous state C12 ( Figure 8 In the second instantaneous state C12, the first movable contact 6 is decoupled from the first fixed contact 5, the second movable contact 9 is still coupled to the second fixed contact 8, and the movable contact member 6A is coupled to the first lever arm 71.

[0182] In this situation, the current IL initially flowing along the electrodes is completely deflected to the shunt contacts 8 and 9 because no current can flow through the main contacts 5 and 6. Since the conductive path between the terminals 11 is still ensured, no arcing occurs between the main contacts 5 and 6, even though these main contacts remain closed to each other.

[0183] When facing the middle position P B Upon further movement, according to the first rotation direction R1, the first movable contact member 6A continues to actuate the first lever arm 71, and causes the cam member 70 (in cooperation with the biasing device 75) to switch to the second switch position S2.

[0184] When the cam member 70 applies an actuating force to the second movable contact member 9A to move the second movable contact member 9A away from the second fixed contact member 8A (in the first translation direction D1), the switching of the cam member in the switching position S2 causes the second movable contact 9A to move to the decoupling position P2, that is, to be decoupled from the second fixed contact 8A.

[0185] The decoupling of electrical contacts 8 and 9 causes an arc to rise between them. However, since electrical contacts 8 and 9 are immersed in a vacuum atmosphere, such an arc can be effectively extinguished, thereby rapidly interrupting the current IL flowing along the electrodes.

[0186] Due to the decoupling of electrical contacts 8 and 9 located within vacuum chamber 10, the current IL initially flowing along the electrodes is interrupted.

[0187] When the cam member 70 switches to the second switch position S2, the first movable contact member 6A is decoupled from the first lever arm 71, and when it moves further according to the first rotation direction R1, the first movable contact member 6A reaches the intermediate position P. B .

[0188] Clearly, during this disconnection phase, each electrode 2 has switched from the second instantaneous state C12 to the second stable state C2. Figure 9 This corresponds to the open state of the switching device.

[0189] Closure operation

[0190] When the switching device 1 switches from the open state to the closed state, the switching device 1 performs a closing operation.

[0191] Before performing the closing operation, the switching device may have performed the reconnection operation as described below in order to switch in the open state.

[0192] Initially, each electrode 2 is therefore in the second stable state C2 ( Figure 9 ).

[0193] During the closing operation of the switching device, the first movable contact member 6A is in the intermediate position P according to the second rotation direction R2. B With the first run end position P A The first movable contact member 6A therefore moves toward the first fixed contact member 5A. Figure 11 ).

[0194] The cam member 70 is in the switch position S2 and the lever arms 71, 72 are initially decoupled from the first movable contact member 6A.

[0195] However, due to the second lever arm 72 moving toward the first end-of-run position PA The movement trajectory is positioned so that, during the initial movement, the first movable contact member 6A is coupled with the second lever arm 72.

[0196] During this phase of the closing operation, each electrode 2 reaches an instantaneous state C21 ( Figure 11 In this instantaneous state C21, the first movable contact 6 is decoupled from the first fixed contact 5, the second movable contact 9 is still in the decoupled position P2, that is, decoupled from the second fixed contact 8, and the movable contact member 6A is coupled to the second lever arm 72.

[0197] In this situation, there is still no current flowing between the first terminal 11 and the second terminal 12.

[0198] When the first movable contact member 6A is coupled to the second contact arm 72, the first movable contact member 6A actuates the second contact arm 72 and moves the cam member 70 away from the second switch position S2 and toward the first switch position S2 according to the fourth rotation direction R4.

[0199] In this case, the coupling lever arm 7 applies an actuating force to the second movable contact member 9A, which is intended to move the second movable contact member 9A toward the second fixed contact member 8A (second translation direction D2).

[0200] Heading towards the first end position P A Upon further movement, due to the specific design of the cam member 70 and the actuation of the second lever arm 72 by the first movable contact member 6A, the first movable contact member 6A reaches the first fixed contact member 5A before the cam member 70 switches to the second switch position S2. In this way, the first fixed contact 5 is coupled to the first movable contact 6 before the second movable contact 9 is coupled to the second fixed contact 8.

[0201] During this phase of the closing operation, each electrode 2 reaches an instantaneous state C22 ( Figure 12 In this instantaneous state C22, the first movable contact 6 is coupled to the first fixed contact 5, the second movable contact 9 is still in the decoupled position P2, that is, decoupled from the second fixed contact 8, and the movable contact member 6A is coupled to the second lever arm 72.

[0202] In this condition, no current IL can flow between the first terminal 11 and the second terminal 12 through the main electrical contacts 5 and 6. No current flows through the shunt contacts 8 and 9.

[0203] Heading towards the first end position P AUpon further movement, according to the second rotation direction R2, the first movable contact member 6A continues to actuate the second lever arm 72 and causes the cam member 70 (in cooperation with the biasing device 75) to switch to the first switch position S1.

[0204] When the cam member 70 applies an actuating force to the second movable contact member 9A to move the second movable contact member 9A toward the second fixed contact member 8A (second translation direction D2), the switching of the cam member 70 in the switching position S1 causes the second movable contact 9A to move to the coupling position P1, that is, to couple with the second fixed contact 8A.

[0205] When the cam component 70 switches to the first switch position S1, the first movable contact component 6A is decoupled from the second lever arm 72, and reaches the first end-of-operation position P when it moves further according to the second rotation direction R2. A .

[0206] During this phase of the closing operation, each electrode 2 has switched from the transient state C22 to the steady state C1. Figure 6 This corresponds to the closed state of the switching device.

[0207] Disconnection operation

[0208] Switching device 1 performs a disconnection operation when switching from the open state to the ground state.

[0209] Obviously, before performing the disconnection operation, the switching device must perform the disconnection operation as described above in order to switch in the disconnected state.

[0210] Initially, each electrode 2 is therefore in the stable state C2 ( Figure 9 ).

[0211] During the disconnection operation of the switching device, each of the first movable contact members 6A is in the intermediate position P according to the first rotation direction R1. B With the second run end position P C The first movable contact member 6A thus moves toward the corresponding grounding terminal. Figure 10 ).

[0212] When the first movable contact component 6A reaches the second end-of-operation position P C At this time, the first movable contact member 6A is coupled to the ground terminal 13. In this way, the first movable contact member 6A causes the first movable contact 6 to be coupled to the ground terminal 13.

[0213] In this configuration, the first movable contact member 6A electrically connects the second terminal 12 to the ground terminal 13. Therefore, the second terminal 12 is placed at a ground voltage.

[0214] It is evident that when the switching device performs a reconnection operation, the motion transmission mechanism 7 is not involved at all.

[0215] Reconnection operation

[0216] When switch device 1 switches from the grounded state to the open state, switch device 1 performs a reconnection operation.

[0217] Initially, each electrode 2 is therefore in the stable state C3 ( Figure 10 ).

[0218] During the reconnection operation of the switching device, each of the first movable contact members 6A is in the second operation end position P according to the second rotation direction R2. C With the middle position P B The first movable contact member 6A thus moves away from the corresponding grounding terminal. Figure 10 ).

[0219] In this way, the first movable contact member 6A causes the first movable contact 6 to be decoupled from the ground terminal 13.

[0220] The first movable contact member 6A no longer electrically connects the second terminal 12 to the ground terminal 13. Therefore, the second terminal 12 is in a floating voltage state.

[0221] It is evident that when the switching device performs a reconnection operation, the motion transmission mechanism 7 is not involved at all.

[0222] Obviously, the switching device must perform the closing operation as described above in order to return to the closed state.

[0223] The switching device according to the invention offers significant advantages over known devices of the prior art.

[0224] The switching device of the present invention includes a simple motion transmission mechanism 7 for each electrode, which allows the first movable contact member 6A to drive the separation of the second movable contact 9 from the second fixed contact 8 according to the position reached during the disconnection operation of the switching device.

[0225] In this way, the disconnection process of the current flowing along each electrode can occur at the electrical contacts 8 and 9 housed in the vacuum chamber 10.

[0226] The possible arcs are caused by the interruption of the current flowing along each electrode, and therefore can only form in a vacuum atmosphere, which improves their extinction process.

[0227] During the opening or closing operation of the switching device, the motion transmission mechanism 7 significantly simplifies the synchronization between the movement of the second movable contact member 9A and the movement of the first movable contact member 6A.

[0228] As shown above, during the closing operation of the switching device, before the cam member 7 switches to the second switch position S2, the first movable contact member 6A reaches the first fixed contact member 5A (thereby causing the first movable contact 6 to couple to the first fixed contact 5).

[0229] Furthermore, the second lever arm 72 is preferably made of an electrically insulating material.

[0230] Because of these arrangements, when the first movable contact 6 is coupled to the first fixed contact 5 ("current generation" process), current flows naturally through the first movable contact member 6A and the first fixed contact member 5A.

[0231] In this case, the shunt contacts 8 and 9 do not need to carry possible short-circuit current or overload current, or more simply carry the rated current.

[0232] This feature is highly advantageous because it enables a more compact design of the vacuum chamber 10, which allows for further reduction in the size and cost of the entire switching device.

[0233] The switching device of the present invention has electrodes with a very compact, simple and robust structure, and has related advantages in terms of size optimization.

[0234] The switching device according to the invention ensures a high level of performance in terms of dielectric insulation and arc extinguishing capability during current disconnection, while also being intended to have a high level of reliability in its application.

[0235] The switching device according to the present invention is relatively easy and inexpensive to manufacture and install in the field.

Claims

1. A switching device (1) for a medium-voltage power system, the switching device comprising one or more electrodes (2), wherein for each electrode, the switching device comprises: - A first terminal (11), a second terminal (12), and a grounding terminal (13), wherein the first terminal (11) is electrically coupled to the first conductor of the wire, the second terminal (12) is electrically coupled to the second conductor of the wire, and the grounding terminal (13) is electrically coupled to the grounding conductor; - A first fixed contact member (5A) and a first movable contact member (6A), the first fixed contact member being electrically connected to the first terminal (11) and including a first fixed contact (5), the first movable contact member (6A) being electrically connected to the second terminal (12) and including a first movable contact (6), the first movable contact member (6A) being reversibly movable about a corresponding first rotation axis (A1), such that the first movable contact (6) can be coupled to the first fixed contact (5) or the ground terminal (13), or decoupled from the first fixed contact (5) or the ground terminal (13); - A second fixed contact member (8A) and a second movable contact member (9A), the second fixed contact member (8A) being electrically connected to the first terminal (11) and including a second fixed contact (8), the second movable contact member (9A) including a second movable contact (9) and being reversibly movable along a corresponding translation axis (A), such that the second movable contact (9) can be coupled to or decoupled from the second fixed contact (8); - A vacuum chamber (10) in which the second fixed contact (8) and the second movable contact (9) are enclosed and can be coupled or decoupled; The characteristic feature is that, for each electrode, the switching device includes a motion transmission mechanism (7), the motion transmission mechanism (7) for actuating the second movable contact member (9A) and includes: - A cam member (70), movable about a second rotation axis (A2) and coupled to a second movable contact member (9A), wherein when the cam member (70) rotates about the second rotation axis (A2), the cam member applies an actuating force on the second movable contact member (9A) to move the second movable contact member along the translation axis (A), wherein the cam member is conductive and electrically connected to the second movable contact member (9A); - A first lever arm (71) is coupled to the cam member (70) and extends radially relative to the second axis of rotation, wherein the first lever arm is conductive and electrically connected to the second movable contact member (9A). - The second lever arm (72) is coupled to the cam member and extends radially relative to the second axis of rotation, and is angularly spaced relative to the first lever arm (71); During the opening or closing operation of the switching device, when the first movable contact member (6A) actuates the first lever arm (71) or the second lever arm (72), the cam member (70) is movable between a first switching position (S1) and a second switching position (S2). The first switching position (S1) corresponds to the coupling position (P1) of the second movable contact member (9A) and the second fixed contact member (8A), and the second switching position (S2) corresponds to the decoupling position (P2) of the second movable contact member (9A) and the second fixed contact member (8A).

2. The switching device according to claim 1, characterized in that: - During the disconnection operation of the switching device, when the first movable contact member moves according to the first rotation direction (R1), the first movable contact member (6A) is coupled to the first lever arm (71) and actuates the first lever arm (71) to move the cam member (70) from the first switch position (S1) to the second switch position (S2). - During the closing operation of the switching device, when the first movable contact member moves according to the second rotation direction (R2), the first movable contact member (6A) is coupled to the second lever arm (72) and actuates the second lever arm (72) to move the cam member (70) from the second switch position (S2) to the first switch position (S1).

3. The switching device according to claim 1 or 2, characterized in that, When the first movable contact member (6A) is coupled to the first lever arm (71), the motion transmission mechanism (7) electrically connects the second movable contact member (9A) to the first movable contact member (6A).

4. The switching device according to claim 1 or 2, characterized in that, The cam member (70) includes one or more coupling surfaces (70A) with the second movable contact member (9A), the coupling surfaces having an eccentric profile relative to the second axis of rotation (A2).

5. The switching device according to claim 1 or 2, characterized in that, The first lever arm (71) is at least partially made of a conductive material.

6. The switching device according to claim 1 or 2, characterized in that, The first lever arm (71) includes a body (713) and a conductive element (714), the conductive element (714) being coupled to the body and electrically connected to the cam member (70) or to a conductive portion of the body electrically connected to the cam member, the conductive element contacting the first movable contact member (6A) when the first movable contact member is coupled to the first lever arm.

7. The switching device according to claim 1 or 2, characterized in that, The second lever arm (72) is made of an electrically insulating material.

8. The switching device according to claim 1 or 2, characterized in that, The motion transmission mechanism (7) includes a biasing device (75) which is used to facilitate the switching of the cam member (70) in the first switch position (S1) or the second switch position (S2) when the first lever arm (71) or the second lever arm (72) is actuated by the first movable contact member (6A).

9. The switching device according to claim 1 or 2, characterized in that, The first movable contact member (6A) of each electrode is capable of operating at the first end position (P). A ) and the second run end position (P) C The first run-end position (P) can be reversibly moved between these positions. A The second operation end position (P) corresponds to the closed state of the switching device. C Corresponding to the grounding state of the switching device, the first movable contact member is in the first operation end position (P) A ) and the second run end position (P) C When moving between ) and passing through the middle position (P) B The intermediate position (P) B This corresponds to the open state of the switching device.

10. The switching device according to claim 9, characterized in that, During the disconnection operation of the switching device, the first movable contact member (6A) is in the first operation end position (P) according to the first rotation direction (R1). A ) and the intermediate position (P) B The first movable contact member is coupled to the first lever arm (71) during the initial movement according to the first rotation direction (R1) while still maintaining contact with the fixed contact member (5A). The first movable contact member actuates the first lever arm to move the cam member (70) from the first switch position (S1) to the second switch position (S2).

11. The switching device according to claim 10, characterized in that, During further movement according to the first rotation direction (R1), the first movable contact member (6A) moves away from the first fixed contact member (5A) while remaining coupled to the first lever arm (71), which actuates the first lever arm to move the cam member (70) from the first switch position (S1) to the second switch position (S2).

12. The switching device according to claim 11, characterized in that, Upon further movement according to the first rotation direction (R1), the first movable contact member (6A) causes the cam member (70) to move in the second switching position (S2) by actuating the first lever arm (71), wherein when the cam member (70) switches in the second switching position (S2), the first movable contact member (6A) is decoupled from the first lever arm and reaches the intermediate position (P). B ).

13. The switching device according to claim 9, characterized in that, During the disconnection operation of the switching device, the first movable contact member (6A) is in the intermediate position (P) according to the first rotation direction (R1). B ) and the second run end position (P) C The movable contact member moves between the first movable contact member and the second operation end position (P). C When the first movable contact member is coupled to the grounding terminal (13), the first movable contact is coupled to the grounding terminal.

14. The switching device according to claim 9, characterized in that, During the reconnection operation of the switching device, the first movable contact member (6A) is in the second operation end position (P) according to the second rotation direction (R2). C ) and the intermediate position (P) B The first movable contact member moves away from the ground terminal (13), thereby causing the first movable contact to decouple from the ground terminal.

15. The switching device according to claim 9, characterized in that, During the closing operation of the switching device, the first movable contact member (6A) is in the intermediate position (P) according to the second rotation direction (R2). B ) and the first run end position (P) A The first movable contact member (6A) is coupled to the second lever arm (72) during the initial movement according to the second rotation direction (R2), thereby actuating the second lever arm (72) to move the cam member (70) from the second switch position (S2) to the first switch position (S1).

16. The switching device according to claim 15, characterized in that, Upon further movement according to the second rotation direction (R2), the first movable contact member (6A) causes the cam member (70) to move in the first switching position (S1) by actuating the first lever arm (71), wherein when the cam member (70) switches in the first switching position (S1), the first movable contact member (6A) is decoupled from the second lever arm (72) and reaches the first end-of-run position (P). A ).

17. The switching device according to any one of claims 1 to 2 and 10 to 16, characterized in that, The switching device is a load circuit breaker for medium-voltage power systems.

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