Mobile contact for switching device

Abstract

A moving contact (20) for a current switching device (50) is provided, comprising: a first conductor blade (1) and a second conductor blade (2) extending in planes (P1, P2) parallel to and away from each other, the conductor blades (1, 2) being rotationally connected about a common axis of rotation (R); a first spacer (3) and a second spacer (4) configured to maintain a minimum distance between the first blade (1) and the second blade (2), the cross-section (S1, S2) of each blade (1, 2) is shaped to have an area equal to the area of a reference cross-section (S1 ', S2') of the rectangular shape and the same length (a), and to have a secondary moment greater than the secondary moment of the reference cross-section (S1 ', S2'), determined with respect to an axis parallel to the transverse axis (T1, T2) of the blade (1, 2).

Description

Technical Field

[0001] This invention belongs to the field of switching devices for medium-voltage electrical equipment, that is, devices with a nominal operating voltage between 1 and 52 kV. These switching devices enable the interruption or establishment of current flow in medium-voltage electrical networks. Background Technology

[0002] Switching devices used in medium-voltage electrical networks may include stationary contacts and moving contacts that can rotate between at least two positions. One position corresponds to the separation of the stationary and moving contacts, called the open position, where current in the circuit is interrupted. Another position corresponds to the mechanical and electrical contact between the stationary and moving contacts, called the closed position, allowing current to flow through the circuit.

[0003] A moving contact typically comprises two elongated elements called blades, which extend parallel to each other and are spaced apart. When the moving contact is in the closed position, a stationary contact is inserted between the opposite ends of the two moving blades and positioned to contact each moving blade.

[0004] The electrodynamic force generated by the flow of electric current means that the blades are subject to an attractive force that pulls them toward each other. This force tends to deform the blades, especially when the current intensity is high, such as during a short circuit.

[0005] This blade deformation tends to reduce the contact pressure between the blade and the stationary contact. This reduction in contact pressure increases the risk of arcing and should be avoided.

[0006] The known practice is to connect the blades together by one or more rigid elements in order to limit the deformation of the blades under electrodynamic forces, thereby ensuring that sufficient contact pressure is maintained between the blades and the stationary contact.

[0007] However, the performance obtained may not be sufficient to meet the growing demands of applications, such as short circuits with particularly high current intensities.

[0008] Furthermore, the presence of these connecting elements makes the moving contact heavier, increasing its cost, and requires additional handling during assembly.

[0009] Therefore, there is a need for moving contacts with improved features, especially in terms of short-circuit withstand strength. Summary of the Invention

[0010] Therefore, the present invention provides a movable contact for a current switching device.

[0011] The moving contact includes:

[0012] - A first conductor blade and a second conductor blade, each conductor blade extending longitudinally along the longitudinal axis and laterally along the transverse axis.

[0013] The longitudinal and transverse axes of the first conductor blade define a first plane, and the longitudinal and transverse axes of the second conductor blade define a second plane.

[0014] The first plane and the second plane are parallel to each other and far apart from each other.

[0015] The first conductor blade and the second conductor blade are rotatably connected about a common axis of rotation perpendicular to the first plane and the second plane.

[0016] - A first spacer and a second spacer are disposed between the first blade and the second blade, the spacers being configured to maintain a minimum distance between the first blade and the second blade.

[0017] The cross-section of each blade is shaped as follows:

[0018] - It has an area equal to that of a reference cross-section, which has a rectangular shape and the same length measured parallel to the transverse axis.

[0019] - A secondary moment having a secondary moment greater than that of the reference cross section, which is determined relative to an axis parallel to the transverse axis of the blade.

[0020] When current flows in the moving contact, the electromagnetic force generated by the current flowing in the same direction in the two conductor blades arranged parallel to each other means that each blade is subject to an attractive force that pulls them toward each other. Therefore, each blade is supported on the spacer.

[0021] Under high-intensity currents (such as short-circuit currents), the portion of the blade located between the spacers tends to deform and take on a bent shape. The deformation is greatest at the equidistant locations between the spacers, which are the supporting areas of the blade.

[0022] The first spacer is positioned near the axis of rotation of the moving contact, and the second spacer is positioned near the area where it can contact the fixed contact. These two spacers are therefore located close to the longitudinal ends of the blade.

[0023] Due to their deformation, the spacing between the blades at each end tends to increase, thereby reducing the contact pressure with the stationary contact. When the contact pressure becomes insufficient, an electric arc may form, and the moving contact may also spontaneously break due to the reduced frictional force holding the moving contact in the closed position. Therefore, excessive variation in the spacing between the contact ends should be avoided.

[0024] According to existing technology, each blade is in the form of a flat strip with a rectangular cross-section. The moving contact includes a third spacer disposed between the first and second spacers, substantially equidistant from each spacer. This third spacer allows for the limitation of blade deformation by providing an additional support area.

[0025] The disadvantage of this third spacer is that it does not benefit from the clamping effect of the blades on the fixed contact, which increases the contact pressure. Furthermore, the third spacer increases the mass and inertia of the moving contact, making its manufacture more complex and increasing its cost.

[0026] According to the invention, the conductor blades have a non-rectangular cross-section to increase their resistance to deformation under electromagnetic forces. Due to this increased resistance, the third spacer can be eliminated. Therefore, the moving contact is easier to assemble and can be manufactured more lightweight. The current flow capacity remains unchanged because only the shape of the cross-section changes, while its area remains constant.

[0027] The features listed in the following paragraphs can be implemented independently of each other or in any technically possible combination:

[0028] Each conductor blade extends along the transverse axis between the first and second longitudinal edges.

[0029] In order to obtain the cross-section of each blade as shaped as described above, the cross-section of each blade may specifically include:

[0030] - The first portion adjacent to the first longitudinal edge of the blade

[0031] - The second portion adjacent to the second longitudinal edge of the blade.

[0032] - Connect the first part to the third part of the second part.

[0033] and:

[0034] - The thickness of the first part and the thickness of the second part are greater than the thickness of the third part.

[0035] According to one aspect of the moving contact, the first longitudinal edge of the blade forms part of the first portion of the blade.

[0036] Similarly, the second longitudinal edge of the blade forms part of the second portion of the blade.

[0037] The thickness of the third part of the cross-section of each blade can vary along the longitudinal axis.

[0038] Similarly, the thickness of the first portion of the cross-section of each blade can vary along the longitudinal axis.

[0039] In the same way, the thickness of the second part of the cross-section of each blade can vary along the longitudinal axis.

[0040] According to one embodiment of the movable contact, the thickness of the third part is less than 60% of the thickness of the first part, preferably less than 50% of the thickness of the first part, and more preferably less than 40% of the thickness of the first part, the thickness being measured in a direction parallel to both the longitudinal axis and the transverse axis.

[0041] Because of the significant difference in thickness between the third part and the two other parts, the bending strength of the blade can be significantly increased.

[0042] According to one embodiment of the movable contact, the thickness of the third part is greater than 10% of the thickness of the first part, preferably greater than 20% of the thickness of the first part, and more preferably greater than 30% of the thickness of the first part.

[0043] Similarly, the thickness of the third part is less than 60% of the thickness of the second part, preferably less than 50% of the thickness of the second part, and more preferably less than 40% of the thickness of the second part.

[0044] Similarly, the thickness of the third part is greater than 10% of the thickness of the second part, preferably greater than 20% of the thickness of the second part, and more preferably greater than 30% of the thickness of the second part.

[0045] According to one embodiment, the movable contact includes:

[0046] - A first guide rod, connected to the first blade, extends along an axis parallel to the axis of rotation and is configured to allow the second blade to slide relative to the first blade.

[0047] - A first elastic element configured to apply a spring force that tends to move the blades toward each other in a direction parallel to the axis of rotation.

[0048] - A second guide rod, which is connected to the first blade and extends along an axis parallel to the axis of rotation, is configured to allow the second blade to slide relative to the first blade.

[0049] - A second elastic element, configured to apply a spring force that tends to move the blades toward each other in a direction parallel to the axis of rotation.

[0050] Furthermore, the first spacer and the second spacer face each other along a direction parallel to the longitudinal axis of the blade.

[0051] In other words, the space longitudinally included between the first spacer and the second spacer has no other spacers.

[0052] Therefore, the moving contact is lighter and easier to assemble.

[0053] In other words, the moving contact consists of exactly two spacers.

[0054] Because the deformation of the blades is minimized by the geometry designed for their cross-section, the force that moves the blades toward each other has the effect of increasing the contact pressure with the fixed contact. This thus prevents the formation of arcing faults. Furthermore, the increased friction between the blades and the fixed contact helps to hold the moving contact in place and prevents the moving contact from spontaneously re-disconnecting.

[0055] Therefore, the longitudinally extending portion of the first blade between the first spacer and the second spacer is free, meaning there is no connecting element that can resist the bending of the first blade in a direction parallel to the axis of rotation.

[0056] The same applies to the second blade.

[0057] The first guide rod and the second guide rod are offset relative to each other along the longitudinal axis of the blade.

[0058] The second blade can slide along the first guide rod and also along the second guide rod.

[0059] According to one embodiment, the first guide rod and the first spacer are concentric.

[0060] The first guide rod and the first elastic element are concentric.

[0061] According to an exemplary embodiment, the first guide rod includes a shoulder supported on the first blade.

[0062] The first guide rod passes through the first and second blades in a direction parallel to the axis of rotation.

[0063] According to one embodiment, the first retainer is rigidly connected to the first guide rod.

[0064] The first end of the first elastic element is supported on the first retainer, and the second end of the first elastic element is supported on the second blade.

[0065] According to an exemplary embodiment, the first elastic element is installed under pretension. The first elastic element tends to push the second blade toward the first blade.

[0066] The first spacer is disposed between the two blades in a direction parallel to the axis of rotation and surrounds the first guide rod.

[0067] The first spacer is cylindrical.

[0068] The first axial surface of the first spacer can be supported on the first blade, and the second axial surface of the first spacer can be supported on the second blade.

[0069] In the same manner, the second guide rod and the second spacer are concentric.

[0070] The second guide rod and the second elastic element are concentric.

[0071] The second guide rod includes a shoulder that is supported on the second blade.

[0072] The second guide rod passes through the first and second blades in a direction parallel to the axis of rotation.

[0073] The second retainer is rigidly connected to the second guide rod.

[0074] The first end of the second elastic element is supported on the second retainer, and the second end of the second elastic element is supported on the second blade.

[0075] The second elastic element is installed under pretension. The second elastic element tends to push the second blade toward the first blade.

[0076] The second spacer is disposed between the two blades in a direction parallel to the axis of rotation and surrounds the second guide rod.

[0077] The second spacer is cylindrical.

[0078] The first axial surface of the second spacer can be supported on the first blade, and the second axial surface of the second spacer can be supported on the second blade.

[0079] According to one embodiment, the first portion of the cross-section of each blade has a convex shape.

[0080] The second part of the cross-section of each blade has a convex shape.

[0081] The third part of each blade extends continuously on either side of the longitudinal axis of each blade.

[0082] According to one embodiment of the movable contact, the first and second portions of the cross-section of each blade are symmetrical to each other with respect to the longitudinal axis of the blade.

[0083] According to one exemplary embodiment, the first portion of the cross-section of each blade includes a generally semi-circular portion.

[0084] Furthermore, the first longitudinal edge of each blade forms part of the basic semi-circular portion of the first part.

[0085] The basic semicircle of the first part has a radius of curvature between 30% and 60% of the thickness of each blade.

[0086] In a similar manner, the second part of each blade comprises a basically semi-circular portion.

[0087] Furthermore, the second longitudinal edge of each blade forms part of the basic semi-circular portion of the second part.

[0088] The radius of curvature of the basic semicircular portion of the second part is between 30% and 60% of the thickness of each blade.

[0089] Therefore, the blade has a circular profile near its longitudinal edge. Compared to conventional blades with a basically rectangular cross-section, this circular profile allows for the limitation of dielectric stress at the blade edge.

[0090] According to one embodiment of the moving contact, the third portion of each blade has a basic rectangular shape.

[0091] The first and second blades have the same length when measured parallel to the longitudinal axis.

[0092] The first and second blades have the same width when measured parallel to the transverse axis.

[0093] The first and second blades have the same thickness, which is measured parallel to the axis perpendicular to both the longitudinal and transverse axes.

[0094] According to one embodiment of the movable contact, the first blade and the second blade are symmetrical about each other about a plane that is parallel to a first plane defined by the longitudinal axis and the transverse axis of the first conductor blade.

[0095] According to one embodiment, the first blade includes a first surface facing the second blade in a direction parallel to the axis of rotation, and the first surface of the first blade is flat.

[0096] Similarly, the second blade includes a first surface facing the first blade in a direction parallel to the axis of rotation, and the first surface of the second blade is flat.

[0097] Each blade consists of two longitudinal edges and two transverse edges.

[0098] According to one embodiment of the moving contact, each blade includes:

[0099] - A first portion with a thickness less than a predetermined threshold, the first portion extending longitudinally along the longitudinal axis and laterally on either side of the longitudinal axis, and

[0100] - A second portion with a thickness greater than a predetermined threshold, the second portion surrounding the first portion.

[0101] The second part forms the longitudinal edge and the transverse edge of the blade.

[0102] Therefore, each blade is formed by thinned portions extending longitudinally and laterally. These thinned portions are continuous by raised portions with a thickness greater than the thickness of the thinned portion itself. The thinned portions are surrounded by portions in the form of raised portions.

[0103] In other words, the longitudinal edge of each blade is part of the second section, with increased thickness.

[0104] The predetermined threshold is, for example, between 30% and 60% of the thickness of each blade.

[0105] According to one embodiment of the movable contact, each blade includes a through recess that extends longitudinally along a longitudinal axis and laterally on either side of the longitudinal axis.

[0106] The length of the concave portion is between 20% and 80% of the blade length, and

[0107] The width of the recess is between 25% and 75% of the width of the blade.

[0108] The through recess can be a basic rectangle.

[0109] The present invention also relates to a current switching device, comprising:

[0110] - A first wire portion, comprising a first electrical conductor and a movable contact as described above, the contact being rotatable relative to the first electrical conductor.

[0111] - The second wire portion includes a second electrical conductor and a fixed contact fixed to the second electrical conductor.

[0112] The moving contact is configured to move between:

[0113] - The first position, referred to as the disconnect position, is where the moving contact is spaced apart from the fixed contact to prevent current from flowing between the first and second wire sections.

[0114] - The second position, known as the closed position, is where the moving contact is in contact with the fixed contact to allow current to flow between the first and second wire sections.

[0115] According to an exemplary embodiment, the current switching device is a medium-voltage or high-voltage switch.

[0116] The present invention also relates to a medium-voltage electrical device configured to selectively establish or disconnect current in a medium-voltage electrical network comprising three phases, the medium-voltage electrical device comprising the current switching devices described above respectively disposed on each phase of the electrical network.

[0117] Electrical equipment can be, for example, a line disconnector or a circuit breaker. Attached Figure Description

[0118] Other features, details, and advantages will become apparent from reading the following detailed description and studying the accompanying drawings, in which:

[0119] Figure 1 This is a schematic diagram of electrical equipment including a switching device, in the position where the current is cut off.

[0120] Figure 2 yes Figure 1 A schematic diagram of the electrical equipment in the diagram, showing the location where current flows.

[0121] Figure 3 This is a perspective view of the movable contact according to a first embodiment of the present invention.

[0122] Figure 4 yes Figure 3 A partial perspective view of the moving contact in the image.

[0123] Figure 5 yes Figure 3 A top view of the moving contact in the middle.

[0124] Figure 6 yes Figure 3 The cross-section of the moving contact in the middle,

[0125] Figure 7 yes Figure 3 Another partial cross-section of the moving contact in the middle,

[0126] Figure 8 yes Figure 3 A cross-sectional view of the conductor blade of the moving contact in the diagram.

[0127] Figure 9 yes Figure 3 A perspective view of the conductor blades of the switching device in the middle.

[0128] Figure 10 (A) and (B) are Figure 3 Another partial cross-section of the moving contact in the middle,

[0129] Figure 11 yes Figure 3 A schematic top view of the moving contact in the middle.

[0130] Figure 12 This is a perspective view of the conductor blade of the movable contact according to a second embodiment of the present invention. Detailed Implementation

[0131] To facilitate reading the accompanying drawings, different elements are not necessarily shown to scale. In these drawings, the same elements have the same reference numerals. Some elements or parameters may be indexed, that is, designated as, for example, first element or second element, or first parameter or second parameter, etc. The purpose of this indexing is to distinguish similar but not identical elements or parameters. This indexing does not imply that one element or parameter takes precedence over another, and the names are interchangeable. The statement that a device includes a given element does not preclude the presence of other elements in that device.

[0132] Figure 1 and Figure 2 A medium-voltage electrical device 100 is shown, configured to selectively establish or disconnect current in a medium-voltage electrical network.

[0133] The electrical network includes three phases Ph1, Ph2, and Ph3. The electrical equipment 100 includes current switching devices 50, 50', and 50 respectively installed on each of the phases Ph1, Ph2, and Ph3 of the electrical network.

[0134] In this configuration, three switching devices 50, 50', and 50" are housed within a pressurized, sealed housing 90. The gas contained within the housing can be an inert gas or air.

[0135] According to the example shown in the figure, the current switching device 50 is a medium-voltage or high-voltage switch.

[0136] Electrical equipment 100 can also be a line disconnector or circuit breaker.

[0137] The current switching device 50 includes a first wire portion 25-1, which includes a first electrical conductor 19 and a movable contact 20. The contact 20 is rotatable relative to the first electrical conductor 19 and is hinged around the first electrical conductor 19.

[0138] The current switching device 50 includes a second wire portion 25-2, which includes a second electrical conductor 22 and a fixed contact 21 fixed to the second electrical conductor 22.

[0139] The movable contact 20 is configured to move between:

[0140] - The first position P1, referred to as the disconnected position, is where the moving contact 20 is spaced apart from the fixed contact 21 to prevent current from flowing between the first wire portion 25-1 and the second wire portion 25-2.

[0141] - The second position P2, referred to as the closed position, is in which the moving contact 20 contacts the fixed contact 21 to allow current to flow between the first wire portion 25-1 and the second wire portion 25-2.

[0142] exist Figure 1In the middle, the movable contact 20 is in position P1, and no current flows between the first wire portion 25-1 and the second wire portion 25-2.

[0143] exist Figure 2 In the middle, the movable contact 20 is in position P2. The current, schematically indicated by the dashed arrow specified by the symbol f, flows between the first wire section 25-1 and the second wire section 25-2, passing sequentially through the movable contact 20 and the fixed contact 21.

[0144] The control mechanism 80, which is not described in detail, allows the movable contact 20 to be moved alternately from position P1 to position P2 and from position P2 to position P1.

[0145] The control mechanism 80 simultaneously moves the moving contact 20' and the moving contact 20', which are respectively part of the switching device 50' and the switching device 50'.

[0146] The proposed current switching device 50 will now be described in detail.

[0147] Figure 3 An overall view of a first embodiment of the proposed movable contact 20 is shown. The movable contact 20 is used in a current switching device 50 (e.g., Figure 1 and Figure 2 The contacts of the current switching device are shown schematically in the diagram.

[0148] The movable contact 20 includes a first conductor blade 1 and a second conductor blade 2. Each conductor blade 1 and 2 extends longitudinally along the longitudinal axes D1 and D2 and laterally along the transverse axes T1 and T2.

[0149] The longitudinal axis D1 and the transverse axis T1 of the first conductor blade 1 define a first plane Pl1. The longitudinal axis D2 and the transverse axis T2 of the second conductor blade 2 define a second plane Pl2. The first plane Pl1 and the second plane Pl2 are parallel to each other and far apart from each other.

[0150] The first conductor blade 1 and the second conductor blade 2 are rotatably connected about a common axis of rotation R perpendicular to the first plane Pl1 and the second plane Pl2.

[0151] The movable contact 20 includes a first spacer 3 and a second spacer 4, which are disposed between the first blade 1 and the second blade 2 and configured to maintain a minimum distance between the first blade 1 and the second blade 2.

[0152] The cross sections S1 and S2 of each blade 1 and 2 are formed as follows:

[0153] - Having an area equal to that of reference cross-sections S1' and S2', wherein reference cross-sections S1' and S2' have a rectangular shape and the same length a, which is measured parallel to the transverse axes T1 and T2, and

[0154] - A secondary moment having a secondary moment greater than that of the reference cross sections S1' and S2', which is determined relative to the axes T1 and T2 parallel to the transverse axes of blades 1 and 2.

[0155] When current flows in the moving contact 20, the electromagnetic force generated by the current flowing in the same direction in the two parallel conductor blades 1 and 2 means that each blade is subjected to an attractive force that pulls it toward each other. These forces are caused by... Figure 11 The symbol fe in the diagram indicates schematically.

[0156] Therefore, each blade 1, 2 is supported on a spacer provided between the blades.

[0157] In the case of high-intensity current (e.g., short-circuit current), the portion of the blades longitudinally included between the spacers tends to deform and take on a curved shape, such as Figure 11 The dashed lines in the diagram schematically indicate the spacers. The spacers form the support areas for the blades. The deformation of the conductor blades is greatest in the portions located substantially equidistantly between the spacers.

[0158] The first spacer 3 is disposed near the rotation axis of the moving contact 20, and the second spacer 4 is disposed near the area where it can contact the fixed contact. These two spacers 3 and 4 are therefore close to the longitudinal end of the blade.

[0159] Due to their deformation under the action of electromagnetic force, the spacing between blades 1 and 2 at each end tends to increase, thereby reducing the contact pressure between the conductor blade and the fixed contact 21.

[0160] This reduction in contact pressure is problematic because it promotes arcing and also facilitates spontaneous re-opening of the moving contact 20. Specifically, the frictional force with the stationary contact 21 that helps hold the moving contact 20 in the closed position may become insufficient. Therefore, excessive variations in the spacing at the ends of the conductor blades should be avoided.

[0161] According to the prior art, each conductor blade 1, 2 is in the form of a flat strip with a rectangular cross-section. The moving contact 20 includes a third spacer disposed longitudinally between the first spacer 3 and the second spacer 4, substantially equidistant from each spacer 3, 4. This third spacer allows for the limitation of deformation of the conductor blades because, in addition to the support provided by the first and second spacers, the third spacer provides an additional support area.

[0162] The disadvantage of this third spacer is that it cannot benefit from the clamping effect of the blade on the fixed contact 21, which will increase the contact pressure.

[0163] According to the present invention, the conductor blades 1 and 2 have non-rectangular cross sections S1 and S2 to increase their resistance to deformation under electromagnetic forces. Due to this increased resistance, the third spacer can be removed while ensuring that the conductor blades 1 and 2 maintain a substantially straight shape.

[0164] Under these conditions, the electrodynamic forces applied to conductor blades 1 and 2 tend to move the blades toward each other without changing their shape, thereby increasing the contact pressure with the fixed contact 21.

[0165] The performance of the moving contact 20 has been improved, particularly in terms of short-circuit withstand strength.

[0166] The cross-sectional area remains the same as that of a conventional blade with a rectangular cross-section, ensuring that the current-carrying capacity remains constant. Specifically, the current-carrying capacity of an electrical conductor is proportional to the area of ​​the cross-section in which the current flows.

[0167] Throughout the specification, the geometric features applicable to one conductor blade also apply to another conductor blade.

[0168] Each blade 1, 2 has cross-sections S1, S2 shaped to have the same area as the so-called reference cross-sections S1', S2'. These reference cross-sections S1', S2' have a rectangular shape and a length M equal to the length of the actual cross-sections S1, S2 of the blades under discussion. As rectangles, these reference cross-sections S1', S2' have a constant width.

[0169] Figure 7 Cross-sections for each of conductor blades 1 and 2 are shown. (For easier reading...) Figure 7 A reference cross-section is depicted only for the first blade 1, and this reference cross-section is depicted by a dashed line specified by the symbol S1'.

[0170] Figure 10 (A) shows the cross section S2 proposed for the second conductor blade 2 itself.

[0171] Figure 10 (B) shows the reference cross section S2' of conductor blade 2.

[0172] In Figure 10 middle, Figure 10 The length M of the rectangular surface S2' in (B) is... Figure 10 The length of section S2 in (A) is the same.

[0173] Corresponding to Figure 10 The thickness dimension E of contact 2 in (A) is greater than Figure 10 The thickness E' of contact 2 in (B) is shown.

[0174] Cross sections S2 and S2' have the same area to ensure that the same effective flow cross section is used for the current.

[0175] Each conductor blade 1, 2 extends along the transverse axes T1, T2 between the first longitudinal edges B1_1, B1_2 and the second longitudinal edges B2_1, B2_2.

[0176] In other words, the conductor blade 1 extends along the transverse axis T1 between the first longitudinal edge B1_1 and the second longitudinal edge B2_1.

[0177] The conductor blade 2 extends along the transverse axis T2 between the first longitudinal edge B1_2 and the second longitudinal edge B2_2.

[0178] To obtain the cross sections S1 and S2 of each blade 1 and 2 as described above, in this case, the cross sections S1 and S2 of each blade 1 and 2 include:

[0179] - The first portions T1_1 and T1_2 adjacent to the first longitudinal edges B1_1 and B1_2 of the blades 1 and 2

[0180] - The second portions T2_1 and T2_2 adjacent to the second longitudinal edges B2_1 and B2_2 of the blades 1 and 2

[0181] - Connect the first parts T1_1 and T1_2 to the third parts T3_1 and T3_2 of the second parts T2_1 and T2_2.

[0182] and:

[0183] - The thicknesses e1_1, e1_2 of the first part T1_1, T1_2 and the thicknesses e2_1, e2_2 of the second part T2_1, T2_2 are greater than the thicknesses e3_1, e3_2 of the third part T3_1, T3_2.

[0184] exist Figure 6 The text specifically shows the different parts and their corresponding thicknesses.

[0185] The thickness E of conductor blades 1 and 2 is similar to the thickness of the different parts defined above for the cross sections S1 and S2 of each conductor blade 1 and 2, and is measured in a direction parallel to and perpendicular to the longitudinal axes D1 and D2 and the transverse axes T1 and T2.

[0186] Therefore, the thickness is measured along the rotation axis R parallel to the moving contact 20.

[0187] Figure 10 The reference frame used to calculate the secondary moment of the proposed cross section S2, and the reference cross section S2', are shown. The secondary moment is determined relative to the axis x, which is parallel to the transverse axes T1 and T2 of blades 1 and 2.

[0188] exist Figure 10 In the middle, the cross section S2 is cut at a given point on the longitudinal axis D2 of the second blade.

[0189] The symbol G represents the centroid of the cross section S2 and forms the origin of the reference frame.

[0190] In this figure, the axis represented by the symbol y passes through the center of gravity G and is parallel to the axis of rotation R.

[0191] The axis represented by the symbol x passes through the center of gravity G and is parallel to the transverse axis T2 of the second blade 2.

[0192] For a rectangular reference surface S2', the centroid G' is equidistant from the opposite edges of the rectangle along both the x-axis and the y-axis.

[0193] The cross section is divided into infinitesimal surface elements dA. These infinitesimal elements are located at a distance dy from the axis x, and their quadratic moments I, determined with respect to the axis x, are calculated using the following formula. xx :

[0194] [Mathematical Expression 1]

[0195]

[0196] The area dA of an infinitesimal element can also be written as: dA = x * dy, given:

[0197] [Mathematical Expression 2]

[0198]

[0199] Second moment of inertia I xx It characterizes the ability of conductor blade 2 to resist bending caused by electromagnetic force, which tends to move the two conductor blades toward each other and bend the blades relative to their transverse axis.

[0200] exist Figure 10 In the diagram, the area dA of infinitesimal elements is schematically indicated by the shaded surface.

[0201] l1 and l2 are the points furthest from the centroid G along the y-axis. Points m1 and m2 are the points furthest from the centroid G along the x-axis.

[0202] according to Figure 10 In the example, the cross section S2 of the second blade 2 is symmetrical with respect to the axis y.

[0203] The first longitudinal edges B1_1 and B1_2 of blades 1 and 2 are part of the first portions T1_1 and T1_2 of blades 1 and 2.

[0204] Similarly, the second longitudinal edges B2_1 and B2_2 of blades 1 and 2 are part of the second portions T2_1 and T2_2 of blades 1 and 2.

[0205] The thickness e3_1, e3_2 of the third part T3_1, T3_2 of the cross sections S1, S2 of each blade 1, 2 can vary along the longitudinal axis D1, D2.

[0206] The thickness e1_1, e1_2 of the first part T1_1, T1_2 of the cross sections S1, S2 of each blade 1, 2 can vary along the longitudinal axis D1, D2.

[0207] Similarly, the thicknesses e2_1 and e2_2 of the second part T2_1 and T2_2 of the cross sections S1 and S2 of each blade 1 and 2 can vary along the longitudinal axes D1 and D2.

[0208] Especially Figure 3 and Figure 4 As shown, notches can be formed around blades 1 and 2.

[0209] According to the example in the illustration, especially Figure 6 In the middle, the thickness e3_1 and e3_2 of the third part T3_1 and T3_2 is less than 60% of the thickness e1_1 and e1_2 of the first part T1_1 and T1_2.

[0210] Preferably, the thickness e3_1, e3_2 of the third parts T3_1, T3_2 is less than 50% of the thickness e1_1, e1_2 of the first parts T1_1, T1_2.

[0211] More preferably, the thicknesses e3_1 and e3_2 of the third parts T3_1 and T3_2 are less than 40% of the thicknesses e1_1 and e1_2 of the first parts T1_1 and T1_2.

[0212] Thickness is measured in directions parallel to and perpendicular to both the longitudinal axes D1 and D2 and the transverse axes T1 and T2. Therefore, thickness is measured parallel to the rotation axis R of the moving contact 20.

[0213] The significant difference in thickness e3_1, e3_2 between the third part T3_1, T3_2 and the thickness of the two other parts allows for a substantial increase in the bending strength of conductor blades 1 and 2. Therefore, they can maintain a substantially straight shape even when a short-circuit current passes through them.

[0214] According to the example shown in the figure, the thicknesses e3_1 and e3_2 of the third parts T3_1 and T3_2 are less than 60% of the thicknesses e2_1 and e2_2 of the second parts T2_1 and T2_2.

[0215] Preferably, the thicknesses e3_1 and e3_2 of the third parts T3_1 and T3_2 are less than 50% of the thicknesses e2_1 and e2_2 of the second parts T2_1 and T2_2.

[0216] More preferably, the thicknesses e3_1 and e3_2 of the third parts T3_1 and T3_2 are less than 40% of the thicknesses e2_1 and e2_2 of the second parts T2_1 and T2_2.

[0217] Similarly, the thicknesses e3_1 and e3_2 of the third parts T3_1 and T3_2 are 10% greater than the thicknesses e2_1 and e2_2 of the second parts T2_1 and T2_2.

[0218] Preferably, the thickness e3_1, e3_2 of the third parts T3_1, T3_2 is 20% greater than the thickness e2_1, e2_2 of the second parts T2_1, T2_2.

[0219] More preferably, the thicknesses e3_1 and e3_2 of the third parts T3_1 and T3_2 are 30% greater than the thicknesses e2_1 and e2_2 of the second parts T2_1 and T2_2.

[0220] According to the example shown in the figure, the thickness e3_1 and e3_2 of the third part T3_1 and T3_2 is 10% greater than the thickness e1_1 and e1_2 of the first part T1_1 and T1_2.

[0221] Preferably, the thickness e3_1, e3_2 of the third parts T3_1, T3_2 is 20% greater than the thickness e1_1, e1_2 of the first parts T1_1, T1_2.

[0222] More preferably, the thickness e3_1, e3_2 of the third parts T3_1, T3_2 is 30% greater than the thickness e1_1, e1_2 of the first parts T1_1, T1_2.

[0223] The overall structure of the moving contact 20 will now be described.

[0224] like Figure 3 and Figure 5 As shown, the movable contact 20 includes:

[0225] - A first guide rod 5, which is connected to the first blade 1, extends along an axis D5 parallel to the axis of rotation R, and is configured to allow the second blade 2 to slide relative to the first blade 1.

[0226] - A first elastic element 7 is configured to apply a spring force that tends to move the blades 1 and 2 toward each other in a direction parallel to the axis of rotation R.

[0227] The movable contact 20 includes:

[0228] - A second guide rod 6, which is connected to the first blade 1, extends along an axis D6 parallel to the axis of rotation R, and is configured to allow the second blade 2 to slide relative to the first blade 1.

[0229] - The second elastic element 8 is configured to apply a spring force that tends to move the blades 1 and 2 toward each other in a direction parallel to the axis of rotation R.

[0230] The first spacer 3 and the second spacer 4 face each other along directions parallel to the longitudinal axes D1 and D2 of the blade.

[0231] It will be understood here that a straight line segment extending from the first spacer 3 and parallel to the longitudinal direction toward the second spacer 4 passes through the second spacer 4 without passing through any other element.

[0232] In the same manner, a straight segment extending from the second spacer 4 and pointing towards the first spacer 3 in a direction parallel to the longitudinal direction passes through the first spacer 3 without passing through any other element.

[0233] In other words, especially in Figure 5 As can be seen, the space longitudinally included between the first spacer 3 and the second spacer 4 has no other spacers.

[0234] The electromagnetic force generated by the current flowing between the first conductor 19 and the fixed contact 21 tends to move the conductor blades 1 and 2 toward each other. By means of their contours, the conductor blades 1 and 2 resist bending loads and maintain a substantially straight shape. Therefore, the electromagnetic force tends to increase the contact pressure at the fixed contact 21 and the first conductor 19.

[0235] Figure 11 The electromagnetic force that tends to move the conductor blades 1 and 2 toward each other is schematically shown. Symbol C1 represents the region in the first blade 1 where the contact pressure with the fixed contact 21 increases. Similarly, symbol C2 represents the region in the second blade 2 where the contact pressure with the fixed contact 21 increases.

[0236] This avoids the risk of arcing.

[0237] Similarly, the risk of the moving contact 20 spontaneously disconnecting again is avoided.

[0238] This increases the current flow capacity between blades 1 and 2 and fixed contact 21.

[0239] Furthermore, the absence of an intermediate spacer between the first spacer 3 and the second spacer 4 reduces the weight of the moving contact 20 and makes it easier to assemble.

[0240] Therefore, the portion of the first blade 1 extending longitudinally between the first spacer 3 and the second spacer 4 is free, meaning there is no connecting element that can resist the bending of the first blade 1 in a direction parallel to the axis of rotation R.

[0241] The same applies to the second blade 2.

[0242] The first guide rod 5 and the second guide rod 6 are positioned relative to each other along the longitudinal axes D1 and D2 of blades 1 and 2.

[0243] The second blade 2 can slide along the first guide rod 5 and along the second guide rod 6.

[0244] When the moving contact 20 moves from the open position P1 to the closed position P2, the fixed contact 21 is inserted between the first conductor blade 1 and the second conductor blade 2. This tends to move the conductor blades apart. The second conductor blade 2 slides along the guide rods 5 and 6, further compressing the elastic elements 7 and 8.

[0245] When the moving contact 20 moves from the closed position P2 to the open position P1, the fixed contact 21 is released from the space contained between the first conductor blade 1 and the second conductor blade 2. Blades 1 and 2 can thus move toward each other under the force applied by the elastic elements 7 and 8, which release their potential energy. The second conductor blade 2 slides along the guide rods 5 and 6 until its movement is blocked by the spacers 3 and 4, which thus act as stoppers.

[0246] According to the example shown in the figure, the first guide rod 5 and the first spacer 3 are concentric.

[0247] The first guide rod 5 and the first elastic element 7 are concentric.

[0248] According to the example shown in the figure, the first guide rod 5 includes a shoulder supported on the first blade 1.

[0249] The shoulder prevents the first guide rod 5 from translating relative to the first blade 1 along the direction of movement oriented toward the second blade 2.

[0250] The first guide rod 5 passes through the first blade 1 and the second blade 2 in a direction parallel to the rotation axis R.

[0251] As in Figure 4 As can be seen in the image, the first blade 1 includes a first through hole 9_1 for receiving the first guide rod 5.

[0252] The first blade 1 includes a second through hole 10_1 for receiving the second guide rod 6.

[0253] The first retainer 11 is rigidly connected to the first guide rod 5.

[0254] The first end 7a of the first elastic element 7 is supported on the first retainer 11. The second end 7b of the first elastic element 7 is supported on the second blade 2.

[0255] The first elastic element 7 is a helical spring in this case.

[0256] In this configuration, the first elastic element 7 is installed under pretension. The first elastic element 7 tends to push the second blade 2 toward the first blade 1.

[0257] The first retainer 11 is screwed onto the first guide rod 5. The shoulder of the first guide rod 5 includes a groove that allows the first guide rod 5 to be screwed into the first retainer 11. Therefore, the relative position of the first retainer 11 along the guide rod can be adjusted, making it possible to adjust the preload applied by the first elastic element 7.

[0258] The second retainer 12 is rigidly connected to the second guide rod 6.

[0259] The first end 8a of the second elastic element 8 is supported on the second retainer 12, and the second end 8b of the second elastic element 8 is supported on the second blade 2.

[0260] The second elastic element 8 is a helical spring in this case.

[0261] The second retainer 12 and the second guide rod 6 are assembled in the same manner as the first retainer 11 and the first guide rod 5.

[0262] The second elastic element 8 is installed under pretension. The second elastic element 8 tends to push the second blade 2 toward the first blade 1.

[0263] The first guide rod 5 and the second guide rod 6 can be the same. Similarly, the first retainer 11 and the second retainer 12 can be the same.

[0264] The first elastic element 7 and the second elastic element 8 can also be the same.

[0265] The first spacer 3 is disposed between the two blades 1 and 2 along a direction parallel to the axis of rotation R, and surrounds the first guide rod 5.

[0266] The first spacer 3 is cylindrical.

[0267] The first axial surface of the first spacer 3 can be supported on the first blade 1, and the second axial surface of the first spacer 3 can be supported on the second blade 2.

[0268] In the same way:

[0269] The second guide rod 6 and the second spacer 4 are concentric.

[0270] The second guide rod 6 and the second elastic element 8 are concentric.

[0271] The second guide rod 6 includes a shoulder supported on the second blade 2.

[0272] The second guide rod 6 passes through the first blade 1 and the second blade 2 in a direction parallel to the rotation axis R20.

[0273] The second blade 2 includes a first through hole 9_2 for receiving the first guide rod 5.

[0274] The second blade 2 includes a second through hole 10_2 for receiving the second guide rod 6.

[0275] Each through hole 9_1, 9_2, 10_1, 10_2 is cylindrical in this case, with a diameter slightly larger than that of the guide rods 5 and 6, so as to allow the guide rods 5 and 6 to pass through and to allow the second conductor blade 2 to slide easily along the guide rods 5 and 6.

[0276] Each through hole 9_1, 9_2, 10_1, 10_2 is formed in a material portion that is part of the third part T3_1, T3_2.

[0277] For example, especially in Figure 8 As can be seen, the through hole that allows the guide rod to pass through is made in a region with increased thickness compared to the adjacent regions along the longitudinal axes D1 and D2.

[0278] The axis of each through hole intersects the longitudinal axes D1 and D2 of the conductor blade under discussion.

[0279] The second spacer 4 is disposed between the two blades 1 and 2 along a direction parallel to the axis of rotation R, and surrounds the second guide rod 6.

[0280] The second spacer 4 is cylindrical.

[0281] The first axial surface of the second spacer 4 can be supported on the first blade 1, and the second axial surface of the second spacer 4 can be supported on the second blade 2.

[0282] When the moving contact 20 is in the open position, the elastic force generated by the second elastic element 8 keeps each of the two blades 1, 2 abutting against the second spacer 4. Specifically, in the absence of a fixed contact 21 between the two blades, the second spacer 4 prevents the blades from contacting each other and ensures a minimum distance between the blades 1, 2. This minimum distance is slightly smaller than the size of the fixed contact 21 so as to allow easy insertion of the fixed contact 21 when the moving contact 20 is closed next.

[0283] The edges of each blade 1, 2 are chamfered to make it easier to insert the retaining contact 21 between the two blades.

[0284] According to the example shown in the figure, the first part T1_1, T1_2 of the cross sections S1, S2 of each blade 1, 2 has a convex shape.

[0285] Similarly, the second part T2_1, T2_2 of the cross sections S1, S2 of each blade 1, 2 has a convex shape.

[0286] The third parts T3_1 and T3_2 of each blade 1 and 2 extend continuously on either side of the longitudinal axis D1 and D2 of each blade.

[0287] In other words, the third part, T3_1, and T3_2, are formed as one, meaning that they form a continuous block.

[0288] When the resulting cross section passes through holes 9_1 and 9_2 that allow guide rod 5 to pass through, the third part T3_1 and T3_2 are formed into two parts, which are separated from each other by a part of the hole.

[0289] The same applies when the resulting cross-section passes through holes 10_1 and 10_2 that allow guide rod 6 to pass through.

[0290] According to the example shown in the figure, the first part T1_1, T1_2 and the second part T2_1, T2_2 of the cross sections S1, S2 of each blade 1, 2 are symmetrical to each other with respect to the longitudinal axes D1, D2 of the blade 1, 2.

[0291] According to an exemplary embodiment, the first portions T1_1 and T1_2 of the cross sections S1 and S2 of each blade 1 and 2 include a generally semi-circular portion.

[0292] Furthermore, the first longitudinal edges B1_1 and B1_2 of each blade 1 and 2 are part of the basic semi-circular portion of the first part T1_1 and T1_2.

[0293] The radius of curvature r1 of the basic semicircular first part T1_1 and T1_2 is between 30% and 60% of the thickness E of each blade 1 and 2.

[0294] In a similar manner, the second parts T2_1 and T2_2 of each blade 1 and 2 include a basically semi-circular portion.

[0295] Furthermore, the second longitudinal edges B2_1 and B2_2 of each blade 1 and 2 are part of the basic semicircular portion of the second part T2_1 and T2_2.

[0296] The radius of curvature r2 of the basic semicircular portions of the second part T2_1 and T2_2 is between 30% and 60% of the thickness E of each blade 1 and 2.

[0297] exist Figure 7 In the diagram, the symbol V1_2 represents the basic semicircular portion of the first part T1_2 of the cross section S2 of the second blade 2, and the symbol V2_2 represents the basic semicircular portion of the second part T2_2 of the cross section S2 of the second blade 2.

[0298] Blades 1 and 2 therefore have a circular profile near their longitudinal edges. Compared to conventional blades with a basically rectangular cross-section, this circular profile allows for the limitation of dielectric stress at the blade edges and also increases their stiffness.

[0299] According to the example shown in the figure, the third part T3_1, T3_2 of each blade 1, 2 is a basic rectangle.

[0300] exist Figure 7 In the diagram, the dashed lines specified by the symbol h indicate the boundaries between different parts. These boundaries are virtual because the different parts are continuations of each other.

[0301] Figure 4 The two conductor blades 1 and 2 of the movable contact 20, which are spaced apart from each other, are shown.

[0302] The first blade 1 and the second blade 2 have the same length L measured parallel to the longitudinal axes D1 and D2.

[0303] The first blade 1 and the second blade 2 have the same width M, measured parallel to the transverse axes T1 and T2.

[0304] The first blade 1 and the second blade 2 have the same thickness E measured parallel to the axes perpendicular to the longitudinal axes D1, D2 and the transverse axes T1, T2.

[0305] The thickness E of conductor blades 1 and 2 is defined as the thickness at the location of maximum thickness.

[0306] The first blade 1 and the second blade 2 are symmetrical about each other about a plane Pl1 that is parallel to the first plane Pl1 defined by the longitudinal axis D1 and the transverse axis T1 of the first conductor blade 1.

[0307] The first blade 1 includes a first surface 15_1 facing the second blade 2 along a direction parallel to the axis of rotation R, and the first surface 15_1 of the first blade 1 is flat.

[0308] Similarly, the second blade 2 includes a first surface 15_2 facing the first blade 1 along a direction parallel to the axis of rotation R. The first surface 15_2 of the second blade 2 is flat.

[0309] like Figure 6 As shown, the first electrical conductor 19 is disposed between the first surface 15_1 of the first blade 1 and the first surface 15_2 of the second blade 2, and is in contact with each of these surfaces under the action of the force generated by the first elastic element 7.

[0310] Figure 9 With Figure 3 and Figure 4 The first blade 1 is shown from different perspectives.

[0311] The second blade 2, not shown, has the same geometric features as the first blade 1 and is symmetrical to the first blade 1.

[0312] Each blade 1, 2 includes two longitudinal edges and two transverse edges.

[0313] Each leaf 1, 2 includes:

[0314] - First portions 17_1 and 17_2 having thicknesses e1_1 and e1_2 less than a predetermined threshold s, the first portions 17_1 and 17_2 extending longitudinally along longitudinal axes D1 and D2 and laterally on either side of longitudinal axes D1 and D2, and

[0315] - A second portion 18_1, 18_2 having a thickness e2_1, e2_2 greater than a predetermined threshold s, the second portion 18_1, 18_2 surrounding the first portion 17_1, 17_2.

[0316] The second part, 18_1 and 18_2, forms the longitudinal edges of blades 1 and 2 and the transverse edges of blades 1 and 2.

[0317] Therefore, each blade 1, 2 is formed by so-called thinned portions 17_1, 17_2 extending longitudinally and laterally. These so-called thinned portions 17_1, 17_2 are continuous by raised portions 18_1, 18_2 with a thickness greater than that of the thinned portions. The thinned portions 17_1, 17_2 are surrounded by portions in the form of raised portions 18_1, 18_2.

[0318] The longitudinal edges of each blade 1, 2 are part of the second part 18_1, 18_2, with increased thickness.

[0319] Similarly, the lateral edge 2 is part of the second part 18_1, 18_2, and has an increased thickness.

[0320] The predetermined threshold s is, for example, between 30% and 60% of the thickness E of each blade 1 and 2.

[0321] The thickness of the second parts 18_1 and 18_2 is equal to the thickness E of each blade 1 and 2, because the second parts 18_1 and 18_2 form the thicker areas of the first blade 1 and the second blade 2, respectively.

[0322] Figure 12 A second embodiment of the blade 1 of the movable contact 20 is shown.

[0323] In this embodiment, each blade 1, 2 includes a through recess extending longitudinally along longitudinal axes D1, D2 and laterally on either side of longitudinal axes D1, D2.

[0324] The length LE of the through recess is between 20% and 80% of the length L of blades 1 and 2.

[0325] The width ME of the through recesses 27_1 and 27_2 is between 25% and 75% of the width M of blades 1 and 2.

[0326] The length LE of the through recess 27_1 is measured parallel to the longitudinal axis D1 of blade 1. The length of the through recess of blade 2 is measured in the same way.

[0327] The width ME of the through recess 27_1 is measured parallel to the transverse axis T1 of blade 1. Similarly, the width of the through recess of blade 2 is measured parallel to the transverse axis T2 of blade 2.

[0328] exist Figure 12 In the diagram, symbol 27_1 represents the through recess of blade 1. Figure 12 The second blade 2 is not shown. The second blade 2 is symmetrical to the first blade 1, as in the first embodiment.

[0329] The through recesses 27_1 and 27_2 are far from the longitudinal edges of blades 1 and 2 and far from the transverse edges of blades 1 and 2.

[0330] In other words, each blade 1, 2 is formed by a continuous portion of material surrounding a central through-hole. In this embodiment, the aforementioned thinned portion has zero thickness. The central through-hole forms a material-free region.

[0331] Current flows in parallel in each blade 1, 2 in the material portion included between the first longitudinal edge B1_1 and the through recess 27_1 and in the material portion included between the through recess 27_1 and the second longitudinal edge B2_1.

[0332] The dimensions LE and ME of the central recess 27_1 are selected such that the cross-section of the blade has sufficient surface area in the region of the central recess 27_1 to ensure that the current with an intensity equal to the desired maximum intensity can pass through.

[0333] In the example shown, the through recess 27_1 is a basic rectangle.

[0334] Symbol 28A_1 represents the first part of the current flow, and symbol 28B_1 represents the second part of the current flow.

[0335] The two material portions 28A_1 and 28B_1, separated by the through recess 27_1 along a direction parallel to the transverse axis T1, have a constant thickness in this case.

[0336] Similarly, the two material portions 29A_1 and 29B_1, separated by the through recess 27_1 along a direction parallel to the longitudinal axis D1, have a constant thickness.

[0337] In the first embodiment, the first longitudinal edge B1_1 and the second longitudinal edge B2_1 have a circular shape.

Claims

1. A movable contact (20) for a current switching device (50), comprising: - A first conductor blade (1) and a second conductor blade (2), each conductor blade (1, 2) extending longitudinally along the longitudinal axis (D1, D2) and laterally along the transverse axis (T1, T2). The longitudinal axis (D1) and transverse axis (T1) of the first conductor blade (1) define a first plane (Pl1), and the longitudinal axis (D2) and transverse axis (T2) of the second conductor blade (2) define a second plane (Pl2). The first plane (Pl1) and the second plane (Pl2) are parallel to each other and far apart from each other. The first conductor blade (1) and the second conductor blade (2) are rotatably connected about a common axis of rotation (R) perpendicular to the first plane (Pl1) and the second plane (Pl2). - A first spacer (3) and a second spacer (4) are disposed between the first blade (1) and the second blade (2), the spacers being configured to maintain a minimum distance between the first blade (1) and the second blade (2). The cross-sections (S1, S2) of each blade (1, 2) are formed as follows: - Having an area equal to that of a reference cross-section (S1', S2'), the reference cross-section (S1', S2') having a rectangular shape and having the same length (a), said length (a) being measured parallel to the transverse axes (T1, T2), and - A secondary moment having a secondary moment greater than that of the reference cross section (S1', S2'), the secondary moment being determined relative to the axis of the transverse axis (T1, T2) parallel to the blade (1, 2).

2. The movable contact (20) according to claim 1, wherein, Each conductor blade (1, 2) extends along the transverse axis (T1, T2) between the first longitudinal edge (B1_1, B1_2) and the second longitudinal edge (B2_1, B2_2). The cross-sections (S1, S2) of each blade (1, 2) include: - The first portion (T1_1, T1_2) adjacent to the first longitudinal edge (B1_1, B1_2) of the blades (1, 2), - The second portion (T2_1, T2_2) adjacent to the second longitudinal edge (B2_1, B2_2) of the blades (1, 2), - Connect the first part (T1_1, T1_2) to the third part (T3_1, T3_2) of the second part (T2_1, T2_2). And among them: - The thicknesses (e1_1, e1_2) of the first part (T1_1, T1_2) and the thicknesses (e2_1, e2_2) of the second part (T2_1, T2_2) are greater than the thicknesses (e3_1, e3_2) of the third part (T3_1, T3_2).

3. The movable contact (20) according to the preceding claim, wherein, The thickness (e3_1, e3_2) of the third part (T3_1, T3_2) is less than 60% of the thickness (e1_1, e1_2) of the first part (T1_1, T1_2), preferably less than 50% of the thickness (e1_1, e1_2) of the first part (T1_1, T1_2), and more preferably less than 40% of the thickness (e1_1, e1_2) of the first part (T1_1, T1_2). The thickness is measured parallel to the direction perpendicular to the longitudinal axis (D1, D2) and the transverse axis (T1, T2).

4. The movable contact (20) according to any one of the preceding claims, comprising: - A first guide rod (5), which is connected to the first blade (1), extends along an axis (D5) parallel to the axis of rotation (R), and is configured to allow the second blade (2) to slide relative to the first blade (1). - A first elastic element (7) configured to apply a spring force that tends to move the blades (1, 2) toward each other in a direction parallel to the axis of rotation (R). - A second guide rod (6), which is connected to the first blade (1) and extends along an axis (D6) parallel to the axis of rotation (R), is configured to allow the second blade (2) to slide relative to the first blade (1). - A second elastic element (8) is configured to apply a spring force that tends to move the blades (1, 2) toward each other in a direction parallel to the axis of rotation (R). The first spacer (3) and the second spacer (4) face each other along a direction parallel to the longitudinal axis (D1, D2) of the blade.

5. The movable contact (20) according to any one of the preceding claims in conjunction with claim 2, wherein, The third part (T3_1, T3_2) of each blade (1, 2) extends continuously on either side of the longitudinal axis (D1, D2) of each blade.

6. The movable contact (20) according to any one of the preceding claims in conjunction with claim 2, wherein, The first part (T1_1, T1_2) and the second part (T2_1, T2_2) of the cross section (S1, S2) of each blade (1, 2) are symmetrical to each other with respect to the longitudinal axis (D1, D2) of the blade (1, 2).

7. The movable contact (20) according to any one of the preceding claims in conjunction with claim 2, wherein, The first part (T1_1, T1_2) of the cross-section (S1, S2) of each blade (1, 2) includes a basically semi-circular portion. The first longitudinal edges (B1_1, B1_2) of each blade (1, 2) form part of the basic semi-circular portion of the first part (T1_1, T1_2). Furthermore, the second part (T2_1, T2_2) of each blade (1, 2) includes a basically semi-circular portion. The second longitudinal edge (B2_1, B2_2) of each blade (1, 2) forms part of the basic semi-circular portion of the second part (T2_1, T2_2).

8. The movable contact (20) according to any one of the preceding claims in conjunction with claim 2, wherein, The third part (T3_1, T3_2) of each blade (1, 2) has a basic rectangular shape.

9. The movable contact (20) according to any one of the preceding claims, wherein, The first blade (1) and the second blade (2) are symmetrical to each other with respect to a plane (P) that is parallel to a first plane (Pl1) defined by the longitudinal axis (D1) and the transverse axis (T1) of the first conductor blade (1).

10. The movable contact (20) according to any one of the preceding claims, wherein: - The first blade (1) includes a first surface (15_1) facing the second blade (2) along a direction parallel to the axis of rotation (R), the first surface (15_1) of the first blade (1) is flat, and - The second blade (2) includes a first surface (15_2) facing the first blade (1) in a direction parallel to the axis of rotation (R), and the first surface (15_2) of the second blade (2) is flat.

11. The movable contact (20) according to any one of the preceding claims, wherein, Each blade (1, 2) includes two longitudinal edges and two transverse edges. And each blade (1, 2) includes: - A first portion (17_1, 17_2) having a thickness (e1_1, e1_2) less than a predetermined threshold (s), the first portion (17_1, 17_2) extending longitudinally along the longitudinal axis (D1, D2) and laterally on either side of the longitudinal axis (D1, D2), and - A second portion (18_1, 18_2) having a thickness (e2_1, e2_2) greater than a predetermined threshold (s), the second portion (18_1, 18_2) surrounding the first portion (17_1, 17_2). The second part (18_1, 18_2) forms the longitudinal edge of the blade (1, 2) and the transverse edge of the blade (1, 2).

12. The movable contact (20) according to any one of the preceding claims, wherein, Each leaf (1, 2) includes: - A through recess (27_1, 27_2) extends longitudinally along the longitudinal axes (D1, D2) and laterally on either side of the longitudinal axes (D1, D2). The lengths of the recesses (27_1, 27_2) are between 20% and 80% of the lengths of the blades (1, 2). The width of the recesses (27_1, 27_2) is between 25% and 75% of the width of the blades (1, 2).

13. A current switching device (50), comprising: - A first wire portion (25-1) comprising a first electrical conductor (19) and a movable contact (20) according to any one of the preceding claims, the contact (20) being rotatable relative to the first electrical conductor (19). - The second wire portion (25-2) includes a second electrical conductor (22) and a fixed contact (21) fixed to the second electrical conductor (22). The movable contact (20) is configured to move between: - The first position (P1), referred to as the disconnect position, is in which the moving contact (20) is spaced apart from the fixed contact (21) to prevent current from flowing between the first wire section (25-1) and the second wire section (25-2). - The second position (P2) is referred to as the closed position, in which the moving contact (20) contacts the fixed contact (21) to allow current to flow between the first wire section (25-1) and the second wire section (25-2).

14. A medium-voltage electrical device (100) configured to selectively establish or interrupt current in a medium-voltage electrical network comprising three phases (Ph1, Ph2, Ph3), comprising current switching devices (50A, 50B, 50C) according to the preceding claim respectively disposed on each phase (Ph1, Ph2, Ph3) of the electrical network.

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