Measuring device for medium-voltage electrical equipment

Abstract

Measuring device (20) for a medium-voltage electrical device (100), comprising: - a carrier (1), - a sensor (2) configured to detect vibrations, wherein the sensor (2) is integrally connected to the carrier (1), - a first magnet (7) configured to attach the measuring device (20) to a receiving zone (50) of the medium-voltage electrical device (100), wherein the carrier (1) comprises three contact surfaces (4, 5, 6) configured to come into contact with the receiving zone (50) of the medium-voltage electrical device (100), and wherein the three contact surfaces (4, 5, 6) extend in planes (P1, P2, P3) which intersect each other.

Description

Technical area

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

[0002] It is known to monitor the smooth operation 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 certain events, such as a deterioration in the health of the equipment's mechanism or a partial discharge within the equipment.

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

[0004] Mounting such a sensor can be complicated. In particular, it is important that the detected vibration signal is reproducible between identical devices, so that the same techniques can be used to analyze the vibration signal for identical devices. Furthermore, the time required to mount the measuring sensor must be limited as much as possible to minimize disruption to the operation of the electrical equipment. It is also important to avoid any degradation of the electrical equipment's performance due to the installation of a measuring sensor.

[0005] The object of the invention is to provide a solution that makes it possible to meet these different requirements. Summary

[0006] For this purpose, the invention proposes a measuring device for a medium-voltage electrical device, comprising: - a carrier, - a sensor configured to detect vibrations, the sensor being integrally connected to the support, - a first magnet configured to fix the measuring device to a receiving zone of the medium-voltage electrical device, wherein the support comprises three contact surfaces configured to come into contact with the receiving zone of the medium-voltage electrical device, and wherein the three contact surfaces extend within planes which intersect each other.

[0007] In other words, the three contact surfaces extend within planes that are not parallel to each other. The three contact surfaces thus define a zone that allows the measuring device to be repeatedly positioned on the electrical device. The first magnet allows the measuring device to be attached to the electrical device without modifying the electrical device.

[0008] The features listed in the following paragraphs can be implemented independently or in any technically possible combination: The recording zone may comprise three recording sections extending in planes that intersect each other. The receiving zone comprises a ferromagnetic material. The first magnet is configured to hold the measuring device on the receiving zone without sliding during nominal operation of the electrical device. The carrier can be made of metal. The support can be formed by bending a metal strip. The thickness of the metal strip, for example, is between 0.5 millimeters and 3 millimeters. For example, the strip is bent in two vertical bending directions. The carrier can be made of plastic. The carrier can be molded onto the sensor. The sensor can be screwed or glued to the carrier. The sensor can be force-fitted into the carrier. The sensor can be an accelerometer. The sensor, for example, is a three-axis accelerometer. The sensor can be a wireless sensor. The sensor can also be an energy-harvesting sensor. For example, the sensor can be powered by a piezoelectric generator. The sensor can be a wired sensor.

[0009] According to one embodiment of the measuring device, the three contact surfaces are flat.

[0010] According to one embodiment of the measuring device, the three contact surfaces are orthogonal to each other.

[0011] This makes it easier to attach the measuring device to a parallelepiped-shaped receiving zone.

[0012] The three recording sections of the recording zone can each be orthogonal to each other.

[0013] The receiving zone of the medium-voltage electrical device and a section of the support have complementary shapes.

[0014] According to one embodiment of the measuring device, the first magnet is integrally connected to the sensor.

[0015] The mechanical integration of the first magnet is thus facilitated.

[0016] According to an alternative embodiment of the measuring device, the first magnet is integrally connected to the carrier. In other words, the carrier encompasses the first magnet.

[0017] According to one embodiment of the measuring device, the carrier comprises a second magnet configured to hold the measuring device on the receiving zone of the medium-voltage electrical device.

[0018] The second magnet may have a cylindrical shape.

[0019] The second magnet may be flush with a first contact surface.

[0020] The second magnet is attached to the carrier.

[0021] The second magnet, for example, is glued to the carrier.

[0022] According to one embodiment of the measuring device, the carrier comprises a third magnet configured to hold the measuring device on the receiving zone of the medium-voltage electrical device.

[0023] 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 carrier.

[0024] 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 carrier.

[0025] The free surface of the second magnet and the free surface of the third magnet are therefore not parallel. The second magnet and the third magnet thus generate magnetic forces in transverse directions. The mounting of the measuring device is improved.

[0026] The free area of ​​the second magnet differs from the free area of ​​the third magnet.

[0027] The third magnet, for example, has a cylindrical shape.

[0028] The third magnet can be flush with a second contact surface.

[0029] The fastening force resulting from the interaction between the third magnet and the receiving zone of the medium-voltage electrical device is thus maximized.

[0030] The third magnet is attached to the carrier. The third magnet is glued to the carrier, for example.

[0031] According to one embodiment, the free surface of the second magnet forms a first contact surface.

[0032] The relative position of the second magnet with respect to the receiving zone of the medium-voltage electrical device is thus the only factor affecting the relative position of the carrier with respect to the receiving zone of the medium-voltage electrical device. The precision required in the manufacture of the carrier can thus be reduced.

[0033] According to one embodiment, the free surface of the third magnet forms a second contact surface.

[0034] According to another embodiment, the free surface of the second magnet is spaced from the first contact surface.

[0035] Thus, there is a gap between the second magnet and the first contact surface. The position of the second magnet on the carrier has no effect on the contact between the carrier and the electrical device. It is not necessary to precisely position the first magnet on the carrier to ensure precise positioning of the measuring device relative to the electrical device.

[0036] According to another embodiment, the free surface of the third magnet is spaced from the second contact surface.

[0037] According to an example of an embodiment of the measuring device, the sensor comprises a base made of ferromagnetic material.

[0038] According to another example of an embodiment of the measuring device, the sensor comprises a plastic base.

[0039] According to one embodiment, the first magnet forms one of the three contact surfaces.

[0040] According to an example of an embodiment of the measuring device, the base of the sensor and the magnet are arranged on both sides of a wall of the carrier.

[0041] The base of the sensor includes a flat surface configured to rest on the support.

[0042] For example, the base of the sensor has a parallelepiped shape.

[0043] The carrier includes a surface for receiving the sensor.

[0044] According to one embodiment of the measuring device, the carrier comprises a through-hole for the passage of a part of the sensor.

[0045] The first magnet for attaching the sensor to the receiving zone may be in the shape of a ring.

[0046] A portion of a first surface of the wall forms a surface for receiving the sensor.

[0047] A second surface of the wall, opposite the first surface, is parallel to a free surface of the first magnet for attaching the sensor to the support.

[0048] The through hole can surround the first magnet.

[0049] The magnet for attaching the sensor to the receiving zone and the through hole can be coaxial.

[0050] A plane parallel to the free surface of the third magnet and passing through the free surface of the second magnet passes through the through hole for the passage of a part of the sensor.

[0051] 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 through hole for the passage of a part of the sensor.

[0052] Thus, the second magnet and the third magnet ensure the stability of the measuring device on the electrical device.

[0053] The base of the sensor is extended by a cylindrical section which includes a receiving housing for receiving the first magnet.

[0054] The receiving housing and the first magnet may have complementary shapes.

[0055] According to an example of an embodiment of the measuring device, the sensor comprises a positioning tab and the carrier comprises a receiving hole configured to receive the positioning tab such that the sensor is blocked in rotation with respect to the carrier.

[0056] The orientation of the sensor is therefore fixed.

[0057] The positioning tab extends radially from the circumference of the cylindrical portion comprising the receiving housing for receiving the first magnet.

[0058] The receiving hole may be a notch formed in the periphery of the through hole.

[0059] The invention also relates to an arrangement of a measuring device and a medium-voltage electrical device, wherein the support of the measuring device is fastened to a facade of the medium-voltage electrical device.

[0060] The facade, for example, extends in an essentially vertical plane.

[0061] For example, the facade extends in a plane that forms an angle between 0° and 30° to the vertical direction.

[0062] According to one embodiment, the support is in contact with an upper corner of the facade.

[0063] The medium-voltage electrical equipment is, for example, a cell of a medium-voltage switchgear for secondary distribution.

[0064] The cell of the medium-voltage switchgear has a parallelepiped shape.

[0065] Also disclosed is a method for mounting a measuring device as described above on a medium-voltage electrical device. The method may comprise the following steps: - Providing a carrier, - Providing a sensor configured to detect vibrations, the sensor being integrally connected to the carrier, - Positioning the measuring device on the medium-voltage electrical equipment such that the three contact surfaces of the support are in contact with the receiving zone of the medium-voltage electrical equipment in order to fix the measuring device to the medium-voltage electrical equipment.

[0066] The step of providing a sensor integrally connected to the carrier may include a sub-step of attaching the sensor to the carrier. Short description of the drawings

[0067] Further features, details and advantages will become apparent upon reading the following detailed description and studying the attached drawings, in which: Fig. 1 is a perspective view of a measuring device according to a first embodiment and a medium-voltage electrical device, Fig. 2 another perspective view of the measuring device of Fig. 1 is, Fig. 3 is an exploded perspective view of a measuring device according to another embodiment, Fig. 4 is a schematic front view of a measuring device attached to a medium-voltage electrical device, Fig. 5 is a schematic front view of a measuring device attached to another medium-voltage electrical device, Fig. 6 a partially schematic view of the measuring device of Fig. 2 and alternative embodiments. Description of the embodiments:

[0068] To facilitate reading the figures, the various elements are not necessarily shown to scale. In these figures, identical elements have the same reference numerals. Some elements or parameters may be given ordinal numbers, in other words, designated, for example, as first element or second element, or first parameter and second parameter, etc. The purpose of this ordinal numbering is to distinguish between elements or parameters that are similar but not identical.

[0069] This ordinal numbering does not imply any priority of one element or parameter over another, and the designations may be interchanged. When it is stated that a subsystem includes a given element, this does not exclude the presence of other elements within that subsystem. When it is also stated that a subsystem includes a given element, it is understood that the subsystem includes at least that element.

[0070] Fig. 4 shows an arrangement of a measuring device 20 and a medium-voltage electrical device 100. The medium-voltage electrical device 100 is, for example, a cell of a medium-voltage switchgear for primary distribution or secondary distribution.

[0071] The cell of the medium-voltage switchgear has a parallelepiped shape.

[0072] The medium-voltage electrical device 100 comprises a facade 90.

[0073] The facade 90 defines a front side of the electrical device 100.

[0074] The facade 90 extends in a substantially vertical plane. More precisely, the facade 90 extends in a plane that forms an angle between 0° and 30° with the vertical direction Z.

[0075] In the various figures, the Z axis denotes the vertical axis. The X axis denotes a transverse direction perpendicular to the side surfaces of the device 100. The Y axis denotes a second transverse direction perpendicular to the facade 90.

[0076] The measuring device 20 comprises a support 1 and a sensor 2 configured to detect vibrations. The sensor 2 is integrally connected to the support 1. The support 1 of the measuring device 20 is attached to the facade 90 of the medium-voltage electrical device 100.

[0077] The measuring device 20 makes it possible to monitor the operation of the medium-voltage electrical device 100. For this purpose, the vibration signal from the sensor 2 is processed using various algorithms that are not described in detail herein. Processing the generated signal makes it possible to characterize the operation of the electrical device and, in particular, to detect any anomalies during operation.

[0078] Thus, the status of the components of the electrical device 100, for example, the current interruption devices, can be characterized. Certain events during the operation of the electrical device 100 can also be detected, for example, partial discharges.

[0079] The vibration signal supplied by the sensor 2 of the measuring device 20 can be processed in real time or post-processing.

[0080] In response to the detection of abnormal operation, corrective action may be taken on the electrical device 100. For example, maintenance may be performed to replace or repair damaged components of the electrical device.

[0081] A measuring device 20 for a medium-voltage electrical device 100 is proposed, comprising: - a carrier 1, - a sensor 2 configured to detect vibrations, the sensor 2 being integrally connected to the carrier 1, - a first magnet 7 configured to fix the measuring device 20 to a receiving zone 50 of the medium-voltage electrical device 100, wherein 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 device 100, and wherein the three contact surfaces 4, 5, 6 extend within planes P1, P2, P3 which respectively intersect each other.

[0082] In other words, the three contact surfaces 4, 5, 6 extend within planes P1, P2, P3 that are not parallel to each other. The three contact surfaces 4, 5, 6 thus define a receiving zone that forms a spatial reference that enables repeatable positioning of the measuring device 20 on the electrical device 100. The first magnet 7 makes it possible to attach the measuring device 20 to the electrical device 100 without modifying or altering the electrical device 100. For example, no drilling or gluing is necessary. The installation of the measuring device, which makes it possible to monitor the operation of the electrical unit, is thus particularly simple.

[0083] The receiving zone 50 comprises three receiving sections 50A, 50B, 50C, which extend in planes that intersect each other.

[0084] The Fig. The medium-voltage electrical device 100 shown schematically in Figure 1 has a parallelepiped shape.

[0085] The three receiving sections 50A, 50B, 50C of the receiving zone 50 are thus orthogonal to each other.

[0086] The receiving zone 50 comprises a ferromagnetic material. The receiving zone 50 can thus interact with one or more magnets to enable the measuring device 20 to be attached to the medium-voltage electrical device 100.

[0087] As in Fig. 1, the receiving zone 50 of the medium-voltage electrical device 100 and a portion of the carrier 1 have complementary shapes in the example shown.

[0088] Fig. 2 shows the measuring device 20 detached from the electrical device 100.

[0089] The three contact surfaces 4, 5, 6 are flat in this case.

[0090] In this case, the three contact surfaces 4, 5, and 6 are orthogonal to each other. This facilitates the attachment of the measuring device 20 to a parallelepiped-shaped receiving zone.

[0091] The first magnet 7 is configured to hold the measuring device 20 on the receiving zone 50 without sliding during the nominal operation of the electrical device 100. In other words, the first magnet 7 enables the measuring device 20 and the electrical device 100 to be secured together. The measuring device 20 is rigidly connected to the electrical device 100, at least for the acceleration values ​​to which the electrical device 100 is exposed during normal use.

[0092] According to a not shown example of an embodiment of the measuring device 20, the first magnet 7 is integrally connected to the carrier 1. In other words, the carrier 1 comprises the first magnet 7.

[0093] The carrier 1 can be made of different materials.

[0094] According to one embodiment, the carrier 1 is made of metal.

[0095] The carrier 1 is formed, for example, by bending a metal strip.

[0096] For example, the strip is bent in two perpendicular directions. The thickness of the metal strip is, for example, between 0.5 millimeters and 3 millimeters.

[0097] For example, the strip is made of steel.

[0098] According to another embodiment, the carrier 1 may be made of plastic.

[0099] For example, the carrier 1 can consist of acrylonitrile butadiene styrene.

[0100] Sensor 2 in this case is an accelerometer.

[0101] Sensor 2, for example, is a three-axis accelerometer.

[0102] Sensor 2 thus measures the acceleration in three mutually perpendicular spatial directions.

[0103] Sensor 2 can be a wireless sensor.

[0104] According to an alternative embodiment not shown, the sensor 2 may be a wired sensor.

[0105] The sensor 2 can be attached to the carrier 1 in various ways.

[0106] According to embodiments not shown, the carrier 1 can, for example, be molded onto the sensor 2.

[0107] Alternatively, the sensor 2 can be screwed or glued to the carrier 1. The sensor 2 can be mounted in the carrier 1 with a force fit.

[0108] Fig. 3 shows a measuring device 20, wherein the sensor 2 is separated from the carrier 1.

[0109] The sensor 2 comprises a base 8 made of plastic.

[0110] The base 8 of the sensor 2 comprises a flat surface 15 configured to rest on the support 1.

[0111] The carrier 1 comprises a surface for receiving the sensor 2.

[0112] A portion of a first surface 9 of the wall 10 forms a surface for receiving the sensor 2.

[0113] When the measuring device 20 is in operation, the flat surface 15 of the base 8 of the sensor 2 rests on the first surface 9 of the wall 10 of the support 1.

[0114] In this case, the base 8 of the sensor 2 has a general parallelepiped shape.

[0115] According to another example of an embodiment of the measuring device 20, the sensor 2 comprises a base 8 made of ferromagnetic material.

[0116] According to the example shown, the first magnet 7 forms one of the three contact surfaces 4, 5, 6.

[0117] The first magnet 7 of the carrier 1 forms the contact surface 6.

[0118] 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 device 100 when the measuring device 20 is mounted on this electrical device.

[0119] The base 8 of the sensor 2 and the first magnet 7 are arranged on both sides of the wall 10 of the carrier 1.

[0120] The carrier 1 comprises a through hole 12 for the passage of a part of the sensor 2.

[0121] The through hole 12 surrounds the first magnet 7.

[0122] The first magnet 7 for attaching the sensor 2 to the receiving zone 50 and the through-hole 12 are coaxial in this case. The symbol D1 indicates the common axis of the first magnet 7 and the through-hole 12.

[0123] As in Fig. 3, a plane P3a, which is parallel to the free surface 30b of the third magnet 3b and passes through the free surface 30a of the second magnet 3a, passes through the through-hole 12 for the passage of a part of the sensor 2.

[0124] Likewise, a plane P3b, which is parallel to the free surface 30a of the second magnet 3a and passes through the free surface 30b of the third magnet 3b, also passes through the through-hole 12 for the passage of a part of the sensor 2.

[0125] Thus, the second magnet 3a and the third magnet 3b ensure the stability of the measuring device 20 on the electrical device 100. The first magnet 7 for fastening the sensor 2 to the receiving zone 50 has the shape of a ring in this case.

[0126] As in Fig. 3, the base 8 of the sensor 2 is extended by a cylindrical portion 16 which includes a receiving housing 17 for receiving the first magnet 7.

[0127] The receiving housing 17 and the first magnet 7 have complementary shapes.

[0128] 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.

[0129] The sensor 2 includes a positioning tab 13, and the carrier 1 includes a receiving hole 14 configured to receive the positioning tab 13 such that the sensor 2 is rotationally locked relative to the carrier 1. The orientation of the sensor 2 relative to the carrier 1 is thus fixed.

[0130] The positioning tab 13 extends radially from the circumference of the cylindrical portion 16, which includes the receiving housing 17 for receiving the first magnet 7.

[0131] The receiving hole 14 may be a notch formed in the periphery of the through hole 12.

[0132] The receiving hole 14 extends radially from the circumference of the through hole 12.

[0133] The gap between the through hole 12 and the outside of the cylindrical portion 16 is sufficient to allow easy insertion of the sensor 2 into the carrier 1.

[0134] This gap is sufficiently small to ensure the level of precision expected for the radial position of sensor 2.

[0135] Likewise, there is a gap between the positioning tab 13 and the receiving hole 14. This gap is also chosen to ensure the precise angular positioning expected while allowing easy insertion.

[0136] A second surface 11 of the wall 10, which is opposite the first surface 9, is parallel to a free surface 70a of the first magnet 7 for fixing the sensor 2 to the support 1.

[0137] “Free surface of a magnet” means a surface that can approach or come into contact with a given element and can exert an attractive force of magnetic origin on that other element.

[0138] The first magnet 7 comprises a free surface 70a which can come into contact with the receiving zone 50C of the electrical device 100.

[0139] In this case, the free surface 70a of the first magnet 7 protrudes from the second surface 11 of the wall 10 along the axis Y.

[0140] According to an alternative embodiment not shown, the free surface 70a of the first magnet 7 is flush with the second surface 11 of the wall 10 along the axis Y.

[0141] The second contact surface 5 of the support 1 is in contact with the portion 50B of the receiving zone 50. This portion 50B is substantially horizontal. This second contact surface 5 absorbs the forces generated by the weight of the measuring device 20. The first magnet 7 alone can make it possible to attach the measuring device to the medium-voltage electrical device 100.

[0142] According to the illustrated embodiment, the support 1 comprises a second magnet 3a configured to hold the measuring device 20 on the receiving zone 50 of the medium-voltage electrical device 100.

[0143] The second magnet 3a makes it possible to hold a first contact surface 4 against the receiving portion 50A of the receiving zone 50.

[0144] The second magnet 3a has in this example a cylindrical shape, as shown in the Fig. 2 and Fig. 3 shown.

[0145] The second magnet 3a can be flush with a first contact surface 4.

[0146] The second magnet 3a is attached to the carrier 1.

[0147] The second magnet 3a is, for example, glued to the carrier 1.

[0148] The second magnet 3a is accommodated, for example, in a housing 18a which is formed in the thickness of the carrier 1.

[0149] According to the illustrated example, the support 1 comprises a third magnet 3b configured to hold the measuring device 20 on the receiving zone 50 of the medium-voltage electrical device 100.

[0150] The third magnet 3b makes it possible to hold the second contact surface 5 against the receiving portion 50B of the receiving zone 50.

[0151] The second magnet 3a comprises a free surface 30a extending in a plane parallel to a first contact surface 4 of the carrier 1. The third magnet 3b comprises a free surface 30b extending in a plane parallel to a second contact surface 5 of the carrier 1.

[0152] The free surface 30a of the second magnet 3a differs from the free surface 30b of the third magnet 3b.

[0153] The free surface 30a of the second magnet 3a and the free surface 30b of the third magnet 3b are thus not parallel. The second magnet 3a and the third magnet 3b thus 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 carrier 1 and the sensor 2. This improves the attachment of the measuring device 20.

[0154] The position of the carrier 1 with respect to the electrical device 100 is defined so that it is easily repeatable by positioning the carrier 1 on the electrical device 100 so that each of the magnets 7, 3a, 3b presses the contact surfaces 4, 5, 6 onto the receiving sections 50A, 50B, 50C of the receiving zone 50, respectively.

[0155] Since the position of the sensor 2 itself is defined to be repeatable with respect to the carrier 1, the sensor 2 can be easily and quickly positioned on the electrical device 100 in a repeatable manner, without requiring any tools or modifications to the electrical device to be monitored. The detection algorithms developed for a specific piece of electrical equipment can be used on other devices of the same type without having to adjust their settings. The labor required to implement the detection algorithms is thus reduced.

[0156] The contact surface 4 can be referred to as the first contact surface 4.

[0157] The contact surface 5 can be referred to as the second contact surface 5.

[0158] The contact surface 6 can be referred to as the third contact surface 6.

[0159] The terms first, second and third contact surface are arbitrary, and the different names can be interchanged.

[0160] The third magnet 3b, for example, has a cylindrical shape.

[0161] The third magnet 3b can be flush with a second contact surface 5.

[0162] The fastening force resulting from the interaction between the third magnet 3b and the receiving zone 50 of the medium-voltage electrical device 100 is thus maximized.

[0163] The third magnet 3b is attached to the carrier 1. The third magnet 3b is, for example, glued to the carrier 1.

[0164] The third magnet 3b is accommodated, for example, in a housing 18b which is formed in the thickness of the carrier 1.

[0165] 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 zone when the measuring device 20 is mounted on the electrical device 100.

[0166] In this case, the relative position along the X axis of the second magnet 3a with respect to the through-hole 12 of the sensor 2 is a major factor influencing the relative position of the sensor 2 with respect to the receiving zone 50 of the medium-voltage electrical device 100. The precision required in the manufacture of the support 1 can thus be reduced, since only the part of the support 1 that influences the position of the second magnet 3a along the X axis needs to be precise.

[0167] According to the illustrated example, the free surface 30b of the third magnet 3b forms a second contact surface 5.

[0168] The free surface 30b of the third magnet 3b is in contact with the portion 50C of the receiving zone.

[0169] As before, the relative position along the Z axis of the third magnet 3b with respect to the through-hole 12 of the sensor 2 is a major factor influencing the relative position along the Z axis of the sensor 2 with respect to the receiving zone 50.

[0170] According to another embodiment not shown, the free surface 30a of the second magnet 3a is spaced from the first contact surface 4.

[0171] 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.

[0172] The position of the second magnet 3a on the carrier 1 then has no influence on the position of the contact between the carrier 1 and the electrical device 100. A precise position of the second magnet 3a on the carrier 1 is not required to ensure precise positioning of the measuring device 20 with respect to the electrical device 100.

[0173] Likewise, according to another embodiment not shown, the free surface 30b of the third magnet 3b is spaced from the second contact surface 5.

[0174] Fig. Figure 6 schematically shows the possible positions of the second magnet 3a with respect to the surface of the carrier 1.

[0175] In Part A of Fig. 6, the free surface 30a of the second magnet 3a protrudes from the surface of the carrier 1. The free surface 30a thus forms the first contact surface 4, since the free surface 30a comes into contact with the receiving zone 50, while a gap remains between the surface of the carrier 1 and the receiving zone 50.

[0176] In Part B of Fig. 6, the free surface 30a of the second magnet 3a is flush with the surface of the carrier 1. The surface of the carrier 1 and the free surface 30a are jointly in contact with the receiving zone 50 when the carrier 1 is mounted on the electrical device 100. The free surface 30a and the surface of the carrier 1 both define the first contact surface 4.

[0177] In Part C of Fig. 6, the free surface 30a of the second magnet 3a is set back from the surface of the carrier 1. A gap remains between the free surface 30a and the receiving zone 50 when the carrier 1 is mounted on the electrical device 100. The free surface 30a does not form part of the first contact surface 4. The first contact surface 4 is defined by the surface of the carrier 1.

[0178] The same alternatives also apply to the position of the third magnet 3b and were not shown.

[0179] According to the embodiment of Fig. 4, the beam 1 is in contact with an upper corner 80 of the facade 90.

[0180] The corner 80 represents the intersection point between the three receiving sections 50A, 50B, 50C of the receiving zone 50.

[0181] Fig.Figure 5 shows another embodiment in which the connection point 81 between a side surface and a top surface of the electrical device 100 is curved. This connection point 81 has no sharp edge.

[0182] The first magnet 7, the second magnet 3a and the third magnet 3b ensure the position of the carrier 1 in the same way as before.

[0183] The edge 19, which is formed by the intersection of the top side of the carrier 1 and the side surface of the carrier 1, is spaced from the connection point 81.

[0184] A method of mounting a measuring device 20 as described above on a medium voltage electrical device 100 will now be described.

[0185] The procedure may include the following steps: - Providing a carrier 1, - Providing a sensor 2 configured to detect vibrations, wherein the sensor 2 is integrally connected to the carrier 1, - Positioning the measuring device 20 on the medium-voltage electrical device 100 such that the three contact surfaces 4, 5, 6 of the carrier 1 are in contact with the receiving zone 50 of the medium-voltage electrical device 100. Thus, or as a result, the measuring device 20 is attached to the medium-voltage electrical device 100.

[0186] As described above, this assembly method enables precise, repeatable assembly. This assembly method is particularly quick to implement and requires no special tools.

[0187] The step of providing a sensor 2 integrally connected to the carrier 1 may comprise a sub-step of attaching the sensor 2 to the carrier 1.

Claims

[1] Measuring device (20) for a medium-voltage electrical device (100), comprising: - a carrier (1), - a sensor (2) configured to detect vibrations, the sensor (2) being integrally connected to the carrier (1), - a first magnet (7) configured to fix the measuring device (20) on a receiving zone (50) of the medium-voltage electrical device (100), wherein 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 device (100), and wherein the three contact surfaces (4, 5, 6) extend in planes (P1, P2, P3) which respectively intersect each other. [2] Measuring device (20) according to claim 1, wherein the three contact surfaces (4, 5, 6) are flat. [3] Measuring device (20) according to one of claims 1 or 2, wherein the three contact surfaces (4, 5, 6) are each orthogonal to one another. [4] Measuring device (20) according to one of the preceding claims, wherein the first magnet (7) is integrally connected to 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 zone (50) of the medium-voltage electrical device (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 zone (50) of the medium-voltage electrical device (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 carrier (1). [7] Measuring device (20) according to one of the preceding claims, wherein the sensor (2) comprises a base (8) made of plastic, wherein the first magnet (7) forms one of the three contact surfaces (4, 5, 6), and wherein the base (8) of the sensor (2) and the magnet (7) are arranged on each side of a wall (10) of the carrier (1). [8] Measuring device (20) according to the preceding claim, wherein the carrier (1) comprises a through-hole (12) for the passage of a part of the sensor (2), and wherein the through-hole (12) surrounds the first magnet (7). [9] Measuring device (20) according to one of the preceding claims, wherein the sensor (2) comprises a positioning tab (13) and the carrier (1) comprises a receiving hole (14) configured to receive the positioning tab (13) such that the sensor (2) is rotationally blocked with respect to the carrier (1). [10] Arrangement of a measuring device (20) according to one of the preceding claims and a medium-voltage electrical device (100), wherein the support (1) of the measuring device (20) is fastened to a facade (90) of the medium-voltage electrical device (100). [11] Arrangement according to the preceding claim, wherein the facade (90) extends in a plane forming an angle between 0° and 30° to the vertical direction. [12] Arrangement according to one of claims 10 or 11, wherein the support (1) is in contact with an upper corner (80) of the facade (90).

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