Measuring device for medium voltage electrical equipment

Abstract

A measuring device (20) is proposed for medium-voltage electrical equipment (100), comprising: - a support (1), - a sensor (2) configured to detect vibrations, the sensor (2) being integral with the support (1), wherein the support (1) includes a first magnet (7) configured to fix the measuring device (20) to a receiving area (50) of the medium-voltage electrical equipment (100), wherein the support (1) includes three contact surfaces (4, 5, 6) configured to come into contact with the receiving area (50) of the medium-voltage electrical equipment (100), wherein the three contact surfaces (4, 5, 6) extend in planes (P1, P2, P3) intersecting in pairs. Abstract figure: Figure 2

Description

Title of the invention: Measuring device for medium voltage electrical equipment technical field

[0001] The present invention relates to the field of medium voltage electrical equipment, such as medium voltage switchgear cells for primary and secondary distribution. Previous technique

[0002] It is known to monitor the proper functioning of medium-voltage electrical equipment by analyzing the vibration signal of the electrical equipment. Analysis of the vibration signal thus makes it possible to detect specific events, such as the deterioration of the equipment's mechanism, or even a partial discharge within the equipment.

[0003] In order to acquire a vibration signal representative of the operation of the medium voltage electrical equipment, a measuring sensor can be attached to this equipment.

[0004] Such an installation can be complex. In particular, it is important that the acquired vibration signal be reproducible between identical equipment, so that the same vibration signal analysis techniques can be used for identical equipment. Furthermore, the intervention time for installing the measuring sensor must be kept to a minimum, in order to minimize disruption to the operation of the electrical equipment. Another important criterion is to avoid degrading the performance of the electrical equipment through the installation of a measuring sensor.

[0005] The object of the invention is to provide a solution that allows these different criteria to be met. Summary

[0006] To this end, the invention proposes a measuring device for medium-voltage electrical equipment, comprising: - a support, - a sensor configured to detect vibrations, the sensor being fixed to the support, - a first magnet configured to fix the measuring device to a receiving area of ​​the medium voltage electrical equipment, in which the support comprises three contact surfaces configured to come into contact with the receiving area of ​​the medium voltage electrical equipment, and in which the three contact surfaces extend in planes intersecting two at two.

[0007] In other words, the three contact surfaces extend in planes that are not parallel in pairs. The three contact surfaces thus define an area allowing for repeatable positioning of the measuring device on the electrical equipment. The first magnet allows the measuring device to be attached to the electrical equipment without any modification to the electrical equipment.

[0008] The features listed in the following paragraphs can be implemented independently of each other or in any technically possible combination:

[0009] The receiving area may comprise three receiving portions extending in planes intersecting two by two.

[0010] The receiving area comprises a ferromagnetic material.

[0011] The first magnet is configured to hold the measuring device on the receiving area without slipping during nominal operation of the electrical equipment.

[0012] The support may be metallic.

[0013] The support can be formed by bending a metal strip.

[0014] The thickness of the metal strip is for example between 0.5 millimeters and 3 millimeters.

[0015] The strip is for example folded along two perpendicular folding directions.

[0016] The support can be made of plastic material.

[0017] The support can be overmolded onto the sensor.

[0018] The sensor can be screwed or glued to the support. The sensor can be mounted by press-fitting into the support.

[0019] The sensor can be an accelerometer.

[0020] The sensor is, for example, a three-axis accelerometer.

[0021] The sensor may be a wireless sensor.

[0022] The sensor can also be of the energy harvesting type. For example, the sensor can be powered by a piezoelectric generator.

[0023] The sensor can be a wired sensor.

[0024] According to one embodiment of the measuring device, the three contact surfaces are flat.

[0025] According to one embodiment of the measuring device, the three contact surfaces are orthogonal in pairs.

[0026] Fixing the measuring device to a parallelepiped-shaped receiving area is thus facilitated.

[0027] The three receiving portions of the receiving zone can be orthogonal in pairs.

[0028] The receiving area of ​​the medium voltage electrical equipment and a portion of the support have complementary shapes.

[0029] According to one embodiment of the measuring device, the first magnet is attached to the sensor.

[0030] The mechanical integration of the first magnet is thus facilitated.

[0031] According to one embodiment of the measuring device, the first magnet is fixed to the support. In other words, the support includes the first magnet.

[0032] According to one embodiment of the measuring device, the support includes a second magnet configured to hold the measuring device on the receiving area of ​​the medium voltage electrical equipment.

[0033] The second magnet can be cylindrical in shape.

[0034] The second magnet can be flush with a first contact surface.

[0035] The second magnet is attached to the support.

[0036] The second magnet is, for example, glued to the support.

[0037] According to one embodiment of the measuring device, the support includes a third magnet configured to hold the measuring device on the receiving area of ​​the medium voltage electrical equipment.

[0038] According to one embodiment of the measuring device, the second magnet comprises a free surface extending in a plane parallel to a first contact surface of the support.

[0039] According to one embodiment of the measuring device, the third magnet comprises a free surface extending in a plane parallel to a second contact surface of the support.

[0040] The free surface of the second magnet and the free surface of the third magnet are therefore not parallel. The second and third magnets thus generate magnetic forces in transverse directions. The mounting of the measuring device is improved.

[0041] The free surface of the second magnet is distinct from the free surface of the third magnet.

[0042] The third magnet is, for example, cylindrical in shape.

[0043] The third magnet can be flush with a second contact surface.

[0044] The fixation force, resulting from the interaction between the third magnet and the receiving area of ​​the medium voltage electrical equipment, is thus maximized.

[0045] The third magnet is attached to the support. The third magnet, for example, is glued to the support.

[0046] According to one embodiment, the free surface of the second magnet forms a first contact surface.

[0047] The relative positioning of the second magnet with respect to the receiving area of ​​the medium-voltage electrical equipment is thus the only factor influencing the relative positioning of the support with respect to the receiving area of ​​the medium-voltage electrical equipment. The precision required in manufacturing the support can therefore be reduced.

[0048] According to one embodiment, the free surface of the third magnet forms a second contact surface.

[0049] According to another embodiment, the free surface of the second magnet is distant from the first contact surface.

[0050] Thus, there is some play between the second magnet and the first contact surface. The positioning of the second magnet on the support does not affect the contact between the support and the electrical equipment. Precise positioning of the first magnet on the support is not necessary to guarantee the accuracy of the positioning of the measuring device relative to the electrical equipment.

[0051] According to another embodiment, the free surface of the third magnet is distant from the second contact surface.

[0052] According to one embodiment of the measuring device, the sensor includes a base made of ferromagnetic material.

[0053] According to another embodiment of the measuring device, the sensor includes a base made of plastic material.

[0054] According to one embodiment, the first magnet forms one of the three contact surfaces.

[0055] According to one embodiment of the measuring device, the sensor base and the magnet are arranged on either side of a wall of the support.

[0056] The sensor base includes a flat surface configured to bear against the support.

[0057] The base of the sensor is, for example, parallelepiped in shape.

[0058] The support includes a sensor receiving surface.

[0059] According to one embodiment of the measuring device, the support includes an opening for the passage of a part of the sensor.

[0060] The first magnet for fixing the sensor to the receiving area may have a ring shape.

[0061] A portion of a first face of the wall forms a receiving surface for the sensor.

[0062] A second face of the wall, opposite the first face, is parallel to a free surface of the first magnet for fixing the sensor to the support.

[0063] The passage orifice can surround the first magnet.

[0064] The magnet for fixing the sensor to the receiving area and the passage orifice can to be coaxial.

[0065] A plane parallel to the free surface of the third magnet and passing through the free surface of the second magnet passes through the passage orifice of a part of the sensor.

[0066] A plane parallel to the free surface of the second magnet and passing through the free surface of the third magnet also passes through the passage orifice of a part of the sensor.

[0067] Thus, the second magnet and the third magnet ensure the stability of the measuring device on the electrical equipment.

[0068] The base of the sensor is extended by a cylindrical portion having a housing for receiving the first magnet.

[0069] The receiving housing and the first magnet have complementary shapes.

[0070] According to one embodiment of the measuring device, the sensor includes a positioning lug and the support includes a receiving orifice configured to receive the positioning lug so as to block the sensor from rotating relative to the support.

[0071] The orientation of the sensor is thus fixed.

[0072] The positioning lug extends radially from the periphery of the cylindrical portion comprising the receiving housing of the first magnet.

[0073] The receiving orifice can be a notch formed in the periphery of the passage orifice.

[0074] The invention also relates to an assembly of a measuring device and medium voltage electrical equipment, in which the support for the measuring device is fixed to a front of the medium voltage electrical equipment.

[0075] The facade extends, for example, in a substantially vertical plane.

[0076] The facade extends, for example, in a plane forming an angle between 0° and 30° with the vertical direction.

[0077] According to one embodiment, the support is in contact with an upper corner of the facade.

[0078] Medium voltage electrical equipment is for example a cell of a medium voltage switchboard for secondary distribution.

[0079] The cell of the medium voltage switchboard is parallelepiped in shape.

[0080] The invention also relates to a method of mounting a measuring device such as described previously for medium-voltage electrical equipment. The process may include the following steps: - to provide support, - provide a sensor configured to detect vibrations, the sensor being fixed to the support, - position the measuring device on the medium voltage electrical equipment of so that the three contact surfaces of the support are in contact with the receiving area of ​​the medium voltage electrical equipment, so as to fix the measuring device to the medium voltage electrical equipment.

[0081] The step of supplying a sensor attached to the support may include a sub-step of attaching the sensor to the support. Brief description of the drawings

[0082] Other features, details and advantages will become apparent upon reading the detailed description below, and upon analysis of the accompanying drawings, on which:

[0083] [Fig-1] is a perspective view of a measuring device according to a first embodiment and of medium voltage electrical equipment,

[0084] [Fig.2] is another perspective view of the measuring device of the [Fig.1],

[0085] [Fig.3] is an exploded, perspective view of a cutting device according to another method of implementation,

[0086] [Fig.4] is a schematic, front view of a measuring device attached to medium voltage electrical equipment,

[0087] [Fig.5] is a schematic, front view of a measuring device attached to other medium-voltage electrical equipment,

[0088] [Fig.6] is a partial schematic view of the measuring device of [Fig.2], and of embodiment variants. Description of the embodiments

[0089] To facilitate reading the figures, the various elements are not necessarily drawn to scale. In these figures, identical elements bear the same reference numerals. Certain elements or parameters may be indexed, that is, designated, for example, as first element or second element, or first parameter and second parameter, etc. This indexing aims to differentiate similar, but not identical, elements or parameters. This indexing does not imply any priority of one element or parameter over another, and the designations may be interchanged. When it is specified that a subsystem includes a given element, this does not exclude the presence of other elements in that subsystem. Similarly, when it is specified that a subsystem includes a given element, it is understood that the subsystem includes at least that element.

[0090] Figure 4 shows an assembly of a measuring device 20 and a medium voltage electrical equipment 100. The medium voltage electrical equipment 100 is, for example, a cell of a medium voltage switchgear for primary or secondary distribution. The medium-voltage switchgear cell is parallelepiped in shape. The medium-voltage electrical equipment 100 includes a front panel 90. The facade 90 defines a front surface of the electrical equipment 100. The façade 90 extends in a roughly vertical plane. More precisely, the facade 90 extends in a plane forming an angle between 0° and 30° with the vertical direction Z.

[0091] In the various figures, the Z-axis designates the vertical axis. The X-axis designates a transverse direction perpendicular to the lateral surfaces of the equipment 100. The Y-axis designates a second transverse direction perpendicular to the front 90.

[0092] The measuring device 20 comprises a bracket 1 and a sensor 2 configured to detect vibrations. The sensor 2 is fixed to the bracket 1. The bracket 1 of the measuring device 20 is attached to the front panel 90 of the medium-voltage electrical equipment 100.

[0093] The measuring device 20 enables monitoring of the operation of the medium-voltage electrical equipment 100. To this end, the vibration signal from the sensor 2 is processed by various algorithms, which will not be detailed here. The signal processing performed makes it possible to characterize the operation of the electrical equipment, and in particular to detect malfunctions. The condition of the components of the electrical equipment 100, for example current interruption devices, can thus be characterized. Specific events in the operation of the electrical equipment 100 can also be detected, for example partial discharges. The processing of the vibration signal delivered by sensor 2 of the measuring device 20 can be carried out in real time or in post-processing.

[0094] Corrective actions can be carried out on the electrical equipment 100 in response to the detection of abnormal operation. For example, a maintenance operation aimed at replacing or repairing damaged components of the electrical equipment can be carried out.

[0095] A measuring device 20 is proposed for a medium voltage electrical equipment 100, comprising: - a support 1, - a sensor 2 configured to detect vibrations, sensor 2 being fixed to support 1, - a first magnet 7 configured to fix the measuring device 20 onto a receiving area 50 of the medium voltage electrical equipment 100, in which the support 1 comprises three contact surfaces 4, 5, 6 configured to come into contact with the receiving area 50 of the medium voltage electrical equipment 100, and in which the three contact surfaces 4, 5, 6 extend in planes PI, P2, P3 intersecting in pairs.

[0096] In other words, the three contact surfaces 4, 5, 6 extend in planes P1, P2, P3 that are not parallel to each other. The three contact surfaces 4, 5, 6 thus define a receiving area forming a spatial reference that allows for repeatable positioning of the measuring device 20 on the electrical equipment 100. The first magnet 7 allows the measuring device 20 to be attached to the electrical equipment 100 without any modification or alteration to the electrical equipment 100. For example, no drilling or gluing is required. The installation of the measuring device for monitoring the operation of the electrical equipment is therefore particularly simple.

[0097] The reception area 50 comprises three reception portions 50A, 50B, 50C extending in planes intersecting two by two. The medium voltage electrical equipment 100 shown schematically in [Fig.1] is parallelepiped in shape. The three reception portions 50A, 50B, 50C of reception zone 50 are thus orthogonal in pairs.

[0098] The receiving area 50 comprises a ferromagnetic material. The receiving area 50 can thus cooperate with one or more magnets so as to allow the measuring device 20 to be fixed to the medium voltage electrical equipment 100.

[0099] As schematically shown in [Fig.1], the receiving area 50 of the medium voltage electrical equipment 100 and a portion of the support 1 have complementary shapes in the illustrated example.

[0100] Fig. 2 illustrates the measuring device 20 separated from the electrical equipment 100. The three contact surfaces 4, 5, 6 are flat here. The three contact surfaces 4, 5, 6 are orthogonal in pairs. This facilitates the attachment of the measuring device 20 to a parallelepiped-shaped receiving area.

[0101] The first magnet 7 is configured to hold the measuring device 20 on the receiving area 50 without slipping during nominal operation of the electrical equipment 100. In other words, the first magnet 7 allows the measuring device 20 and the electrical equipment 100 to be joined together. The measuring device 20 is rigidly linked to the electrical equipment 100, at least for the acceleration values ​​to which the electrical equipment 100 is subjected in normal use.

[0102] According to an example of an embodiment of the measuring device 20, not shown, the first magnet 7 is fixed to the support 1. In other words, support 1 includes the first magnet 7.

[0103] The support 1 can be made of different materials.

[0104] According to one embodiment, the support 1 is metallic. Support 1, for example, is formed by folding a metal strip. The strapping, for example, is folded along two perpendicular folding directions. The thickness of the metal strip, for example, is between 0.5 millimeters and 3 millimeters. The strapping, for example, is made of steel.

[0105] According to another embodiment, the support 1 can be made of plastic material. For example, support 1 can be acrylonitrile butadiene styrene.

[0106] Sensor 2 is here to be an accelerometer. Sensor 2, for example, is a three-axis accelerometer. Sensor 2 thus measures accelerations along three directions in space that are perpendicular to each other.

[0107] Sensor 2 may be a wireless sensor.

[0108] According to an alternative embodiment not shown, the sensor 2 can be a wired sensor.

[0109] The sensor 2 can be fixed to the support 1 in different ways.

[0110] According to examples of embodiments not shown, support 1 may, for example, be overmolded onto sensor 2. Alternatively, sensor 2 can be screwed or glued to support 1. Sensor 2 can be mounted by press-fitting into support 1.

[0111] Fig. 3 represents a measuring device 20 in which the sensor 2 is moved away from the support 1. Sensor 2 includes a plastic base 8. The base 8 of sensor 2 includes a flat surface 15 configured to rest on the support 1. Support 1 includes a receiving surface for sensor 2. A portion of a first face 9 of the wall 10 forms a receiving surface for the sensor 2. When the measuring device 20 is operational, the flat surface 15 of the base 8 of the sensor 2 comes into contact with the first face 9 of the wall 10 of the support 1. The base 8 of sensor 2 is here in a general parallelepiped shape.

[0112] According to another embodiment of the measuring device 20, the sensor 2 comprises a base 8 made of ferromagnetic material.

[0113] According to the illustrated example, the first magnet 7 forms one of the three contact surfaces 4, 5, 6. The first magnet 7 of the support 1 forms the contact surface 6. More specifically, the free surface 70a of the first magnet 7 forms the contact surface 6. The free surface 70a is in contact with the electrical equipment 100 when the Measuring device 20 is mounted on this electrical equipment.

[0114] The base 8 of the sensor 2 and the first magnet 7 are arranged on either side of the wall 10 of the support 1. The support 1 includes an opening 12 for the passage of part of the sensor 2. The passage 12 surrounds the first magnet 7. The first magnet 7, which secures the sensor 2 to the receiving area 50, and the passage 12 are coaxial here. The symbol DI denotes the common axis of the first magnet 7 and the passage 12.

[0115] As shown in [Fig.3], a plane P3a parallel to the free surface 30b of the third magnet 3b and passing through the free surface 30a of the second magnet 3a passes through the passage orifice 12 of a part of the sensor 2. Similarly, a plane P3b parallel to the free surface 30a of the second magnet 3a and passing through the free surface 30b of the third magnet 3b also passes through the passage 12 of part of the sensor 2. Thus, the second magnet 3a and the third magnet 3b ensure the stability of the measuring device 20 on the electrical equipment lOO. The first magnet 7 for fixing the sensor 2 to the receiving area 50 has here a ring shape.

[0116] As shown in [Fig.3], the base 8 of the sensor 2 is extended by a cylindrical portion 16 having a receiving housing 17 for the first magnet 7. The receiving housing 17 and the first magnet 7 have complementary shapes. The first magnet 7 is for example glued to the bottom of the receiving housing 17. The wall of the receiving housing 17 surrounds the first magnet 7 and protects it.

[0117] The sensor 2 includes a positioning lug 13 and the support 1 includes a receiving orifice 14 configured to receive the positioning lug 13 so as to lock the sensor 2 in rotation relative to the support 1. The orientation of sensor 2 relative to support 1 is thus fixed.

[0118] The positioning lug 13 extends radially from the periphery of the cylindrical portion 16 comprising the receiving housing 17 of the first magnet 7. The receiving orifice 14 can be a notch formed in the periphery of the passage orifice 12. The receiving orifice 14 extends radially from the periphery of the passage orifice 12.

[0119] The clearance between the passage orifice 12 and the outside of the cylindrical portion 16 is sufficient to allow easy insertion of the sensor 2 into the support 1. This play is small enough to guarantee the expected level of accuracy in the radial positioning of sensor 2. Similarly, there is play between the positioning lug 13 and the receiving orifice 14. This play is also chosen to guarantee the accuracy of positioning. expected angular function while allowing easy insertion.

[0120] A second face 11 of the wall 10, opposite the first face 9, is parallel to a free surface 70a of the first magnet 7 for fixing the sensor 2 to the support 1.

[0121] The free surface of a magnet is understood to be a surface that can approach a given element, or come into contact with that given element, and exert a magnetically attracted force on that other element.

[0122] The first magnet 7 includes a free surface 70a that can come into contact with the receiving area 50C of the electrical equipment 100. The free surface 70a of the first magnet 7 is here projecting from the second face 11 of the wall 10 along the Y axis. According to an alternative embodiment not shown, the free surface 70a of the first magnet 7 is flush with the second face 11 of the wall 10 along the Y axis.

[0123] The second contact surface 5 of the support 1 is in contact with portion 50B of the receiving area 50. This portion 50B is substantially horizontal. This second contact surface 5 absorbs the forces created by the weight of the measuring device 20. The first magnet 7 alone can secure the measuring device to the medium-voltage electrical equipment 100.

[0124] According to the illustrated embodiment, the support 1 includes a second magnet 3a configured to hold the measuring device 20 on the receiving area 50 of the medium voltage electrical equipment 100. The second magnet 3a allows a first contact surface 4 to be held against the receiving portion 50A of the receiving area 50.

[0125] The second magnet 3a is in this example cylindrical in shape, as illustrated in figures 2 and 3. The second magnet 3a can be flush with a first contact surface 4.

[0126] The second magnet 3a is fixed to the support 1. The second magnet 3a is, for example, glued to support 1. The second magnet 3a is for example received in a housing 18a arranged in the thickness of the support 1.

[0127] According to the illustrated example, the support 1 includes a third magnet 3b configured to hold the measuring device 20 on the receiving area 50 of the medium voltage electrical equipment 100. The third magnet 3b helps to hold the second contact surface 5 against the receiving portion 50B of the receiving area 50.

[0128] The second magnet 3a includes a free surface 30a extending in a plane parallel to a first contact surface 4 of the support 1. The third magnet 3b includes a free surface 30b extending in a plane parallel to a second contact surface 5 of the support 1. The free surface 30a of the second magnet 3a is distinct from the free surface 30b of the third magnet 3b.

[0129] The free surface 30a of the second magnet 3a and the free surface 30b of the third magnet 3b are thus non-parallel. The second magnet 3a and the third magnet 3b therefore generate magnetic forces in transverse directions. The holding force developed by the second magnet 3a and that developed by the third magnet 3b complement the force developed by the first magnet 7 to immobilize the support 1 and the sensor 2. The attachment of the measuring device 20 is improved.

[0130] The position of the support 1 relative to the electrical equipment 100 is defined in a repeatable manner simply by positioning the support 1 on the electrical equipment 100 so that each of the magnets 7, 3a, 3b presses the contact surfaces 4, 5, 6 respectively on the receiving portions 50A, 50B, 50C of the receiving area 50. Since the position of sensor 2 is itself defined in a repeatable way with respect to support 1, sensor 2 can be positioned on electrical equipment 100 in a repeatable way simply and quickly, without requiring any tools or modification of the electrical equipment to be monitored. Detection algorithms developed for a given electrical device can be used on other devices of the same type without having to adjust their parameters. This reduces the effort required to implement the detection algorithms.

[0131] The contact surface 4 can be designated as the first contact surface 4. The contact surface 5 can be designated as the second contact surface 5. The contact surface 6 can be designated as the third contact surface 6. The terms first, second and third contact surface are arbitrary and the different designations can be interchanged.

[0132] The third magnet 3b is, for example, cylindrical in shape. The third magnet 3b can be flush with a second contact surface 5. The holding force resulting from the interaction between the third magnet 3b and the receiving area 50 of the medium-voltage electrical equipment 100 is thus maximized.

[0133] The third magnet 3b is fixed to the support 1. The third magnet 3b is, for example, glued to the support 1. The third magnet 3b is for example received in a housing 18b arranged in the thickness of the support 1.

[0134] According to the illustrated example, the free surface 30a of the second magnet 3a forms a first contact surface 4. In other words, the free surface 30a of the second magnet 3a is in contact with the portion 50B of the receiving area when the measuring device 20 is mounted on the electrical equipment 100.

[0135] In this case, the relative positioning along the X-axis of the second magnet 3a by The ratio to the passage orifice 12 of the sensor 2 is a main factor involved in the relative positioning of the sensor 2 with respect to the receiving area 50 of the medium voltage electrical equipment 100. The precision required for the manufacture of the support 1 can thus be reduced, since only the part of the support 1 influencing the position of the second magnet 3a along the X axis needs to be precise.

[0136] According to the illustrated example, the free surface 30b of the third magnet 3b forms a second contact surface 5. The free surface 30b of the third magnet 3b is in contact with the portion 50C of the receiving area. As before, the relative positioning along the Z axis of the third magnet 3b with respect to the passage orifice 12 of the sensor 2 is a main factor affecting the relative positioning along the Z axis of the sensor 2 with respect to the receiving area 50.

[0137] According to another embodiment, not illustrated, the free surface 30a of the second magnet 3a is distant from the first contact surface 4. Thus, there is a gap between the free surface 30a of the second magnet 3a and the first contact surface 4. The free surface 30a of the second magnet 3a is set back from the first contact surface 4. The positioning of the second magnet 3a on the support 1 therefore has no influence on the location of the contact between the support 1 and the electrical equipment 100. Precise positioning of the second magnet 3a on the support 1 is not necessary to guarantee the accuracy of the positioning of the measuring device 20 relative to the electrical equipment 100.

[0138] Similarly, according to another embodiment not illustrated, the free surface 30b of the third magnet 3b is distant from the second contact surface 5.

[0139] Fig. 6 schematically illustrates the possible positioning of the second magnet 3a relative to the surface of the support 1. On part A of [Fig.6], the free surface 30a of the second magnet 3a is salient from the surface of the support 1. The free surface 30a thus forms the first contact surface 4, since the free surface 30a will come into contact with the receiving area 50 while there remains a gap between the surface of the support 1 and the receiving area 50. In part B of [Fig.6], the free surface 30a of the second magnet 3a is flush with the surface of the support 1. The surface of the support 1 and the free surface 30a come into joint contact with the receiving area 50 when the support 1 is mounted on the electrical equipment 100. The free surface 30a and the surface of the support 1 both define the first contact surface 4. In part C of [Fig. 6], the free surface 30a of the second magnet 3a is recessed from the surface of the support 1. A gap remains between the free surface 30a and the receiving area 50 when the support 1 is mounted on the electrical equipment 100. The surface free 30a is not part of the first contact surface 4. The first contact surface 4 is defined by the surface of the support 1. The same variants also apply to the positioning of the third magnet 3b, and have not been shown.

[0140] According to the embodiment of [Fig.4], the support 1 is in contact with an upper corner 80 of the facade 90. Corner 80 represents the intersection between the three reception portions 50A, 50B, 50C of reception zone 50.

[0141] Figure 5 represents another embodiment in which the junction 81 between a lateral surface and a top surface of the electrical equipment 100 is curved. This junction 81 does not have a sharp edge. The first magnet 7, the second magnet 3a and the third magnet 3b ensure the positioning of the support 1 in the same way as before. The edge 19 formed by the intersection of the upper face of support 1 and the lateral face of support 1 is distant from the junction 81.

[0142] A method of mounting a measuring device 20 as previously described to a medium voltage electrical equipment 100 will now be described.

[0143] The process may include the following steps: - provide support 1, - provide a sensor 2 configured to detect vibrations, sensor 2 being fixed to support 1, - position the measuring device 20 on the medium voltage electrical equipment 100 so that the three contact surfaces 4, 5, 6 of the support 1 are in contact with the receiving area 50 of the medium voltage electrical equipment 100. Thus, the measuring device 20 is fixed to the medium voltage electrical equipment 100.

[0144] As described above, such an assembly method allows for precise and repeatable assembly. This assembly method is also particularly quick to implement and does not require any special tools.

[0145] The step of supplying a sensor 2 attached to the support 1 may include a substep of attaching the sensor 2 to the support 1.

Claims

Claims

1. Measuring device (20) for medium voltage electrical equipment (100), comprising: - a support (1), - a sensor (2) configured to detect vibrations, the sensor (2) being integral with the support (1), - a first magnet (7) configured to fix the measuring device (20) on a receiving zone (50) of the medium voltage electrical equipment (100), in which the support (1) comprises three contact surfaces (4, 5, 6) configured to come into contact with the receiving zone (50) of the medium voltage electrical equipment (100), and in which the three contact surfaces (4, 5, 6) extend in planes (PI, P2, P3) intersecting two by two.

2. Measuring device (20) according to claim 1, wherein the three contact surfaces (4, 5, 6) are planar.

3. Measuring device (20) according to claim 1 or 2, in which the three contact surfaces (4, 5, 6) are orthogonal two by two.

4. Measuring device (20) according to one of the preceding claims, in which the first magnet (7) is integral with the sensor (2).

5. Measuring device (20) according to one of the preceding claims, wherein the support (1) comprises a second magnet (3a) configured to hold the measuring device (20) on the receiving area (50) of the medium voltage electrical equipment (100), and wherein the second magnet (3a) comprises a free surface (30a) extending in a plane parallel to a first contact surface (4) of the support (1).

6. Measuring device (20) according to the preceding claim, wherein the support (1) comprises a third magnet (3b) configured to hold the measuring device (20) on the receiving area (50) of the medium voltage electrical equipment (100), and wherein the third magnet (3b) comprises a free surface (30b) extending in a plane parallel to a second contact surface (5) of the support (1).

7. Measuring device (20) according to one of the preceding claims, in which the sensor (2) comprises a base (8) made of plastic, in which the first magnet (7) forms one of the three contact surfaces (4, 5, 6), and in which the base (8) of the sensor (2) and the magnet (7) are arranged on either side of a wall (10) of the support (1).

8. Measuring device (20) according to the preceding claim, in which the support (1) comprises an orifice (12) for passage of a part of the sensor (2), and in which the orifice (12) for passage surrounds the first magnet (7).

9. Measuring device (20) according to one of the preceding claims, in which the sensor (2) comprises a positioning lug (13) and the support (1) comprises a receiving orifice (14) configured to receive the positioning lug (13) so as to block the sensor (2) in rotation relative to the support (1).

10. Assembly of a measuring device (20) according to one of the preceding claims and of medium voltage electrical equipment (100), in which the support (1) of the measuring device (20) is fixed to a front (90) of the medium voltage electrical equipment (100).

11. Assembly according to the preceding claim, in which the facade (90) extends in a plane forming an angle between 0° and 30° with the vertical direction.

12. An assembly according to claim 10 or 11, wherein the support (1) is in contact with an upper corner (80) of the facade (90).

13. A method of mounting a measuring device (20) according to one of claims 1 to 9 to medium voltage electrical equipment (100), comprising the steps of: - providing a support (1), - providing a sensor (2) configured to detect vibrations, the sensor (2) being integral with the support (1), - positioning the measuring device (20) on the medium voltage electrical equipment (100) so that the three contact surfaces (4, 5, 6) of the support (1) are in contact with the receiving area (50) of the medium voltage electrical equipment (100), so as to fix the measuring device (20) to the medium voltage electrical equipment (100).

14. Method according to the preceding claim, in which the step of providing a sensor (2) secured to the support (1) comprises a sub-step of fixing the sensor (2) to the support (1).

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