• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    This Rogowski loop current sensor (16) is intended to measure a current flowing in an electrical conductor. The current sensor comprises a main winding (22) having two ends (42, 44), a closing mechanism (20) adapted to connect one end (42) to the other end (44). The closing mechanism is movable relative to one of the ends (44) between a closed position and an open position. The two ends (42, 44) are, in the closed position of the closure mechanism, disposed along a longitudinal axis (X) of the closure mechanism (20) and spaced apart from one another along the longitudinal axis (X) . The sensor further comprises a secondary winding (32) disposed between the ends (42, 44) of the main winding (22), in the closed position of the closing mechanism (20). The secondary winding (32) has a plurality of turns offset relative to each other along the longitudinal axis (X).
    公开号:FR3015687A1
    申请号:FR1363463
    申请日:2013-12-23
    公开日:2015-06-26
    发明作者:Jiri Stepanek；Simon Tian；Daniel Sinthomez
    申请人:Schneider Electric Industries SAS；
    IPC主号:
    专利说明:

    [0001] The present invention relates to a Rogowski loop current sensor and a method of manufacturing such a sensor. BACKGROUND OF THE INVENTION The Rogowski loop current sensor is adapted to be positioned around an electrical conductor and to measure a current flowing in such an electrical conductor. Known Rogowski loop current sensors comprise a main winding disposed around the electrical conductor. According to Ampère's theorem and Faraday's law, if the main winding forms a closed loop around the conductor, it restores a signal proportional to the derivative of the current flowing in the electrical conductor. One of the interests of the Rogowski loop current sensor is that it includes a clean closing mechanism to connect two ends of the main winding.
    [0002] More specifically, the closing mechanism is movable with respect to one of the ends between a closed position and an open position respectively, in which the main winding and the closing mechanism form a closed loop around the electrical conductor and a loop respectively. opened. The Rogowski loop current sensor is therefore able to be easily positioned around the electrical conductor or, on the contrary, away from the electrical conductor. However, the closing area of the main winding, i.e. the area where both ends are connected, is critical in that it creates a discontinuity in the main winding. Indeed, in the closed position of the closing mechanism, a space exists between the two ends of the main winding. The presence of this space, or discontinuity, involves an error in the measurement performed by the current sensor. The measurement error with respect to the measurement that a perfect sensor would provide is more or less important, depending on the relative position of the current sensor with respect to the electrical conductor around which it is arranged and with respect to the other electrical conductors arranged near the current sensor, for example less than 5 centimeters. In the field of Rogowski loop current sensors, it is thus known from EP-A1-009 453 a Rogowski loop current sensor, for which the proposed closing mechanism is a magnetic body having a high magnetic permeability. . The magnetic body is, for example, a ferrite and can create a magnetic short circuit, which causes a reduction in the measurement error of the current flowing through the electrical conductor, the error being related to the closure zone, c that is, the space between the two ends of the main winding. However, such a Rogowski loop current sensor is expensive and complex to manufacture industrially. It is also known from WO-A1-2005 / 119274 a current sensor comprising a main winding intended to be positioned around an electrical conductor, the main winding comprising two ends, and a secondary winding positioned between the two ends of the winding. the main winding. The secondary winding is wound around a fixed point in a single plane, with an increase in the distance of the winding from the fixed point during winding. The planar secondary winding makes it possible to compensate for the error in measuring the current due to the space between the two ends of the main winding. However, the results given by such a compensation remain insufficient to obtain a precise current measurement and such a solution is complex to implement. The object of the invention is therefore to propose an Rogowski loop current sensor which is easy and inexpensive to produce industrially, for which the measurement of current is optimized and the measurement error due to the space between the two ends of the device. the main winding is reduced. To this end, the subject of the invention is a Rogowski loop current sensor, intended to measure a current flowing in an electrical conductor, the current sensor comprising, a main winding having two ends, a clean closing mechanism to connect one end at the other end, the closing mechanism being movable with respect to one of the ends between a closed position and an open position, in which the main winding and the closing mechanism form a closed loop around the electrical conductor and respectively an open loop, the two ends being, in the closed position of the closure mechanism, disposed along a longitudinal axis of the closure mechanism and spaced apart from each other along the longitudinal axis, and a secondary winding arranged between the ends of the main winding, in the closed position of the closing mechanism. According to the invention, the secondary winding comprises a plurality of turns offset with respect to each other along the longitudinal axis. Thanks to the invention, the secondary winding positioned between the two ends of the main winding, along the longitudinal axis, is adapted to be arranged in a free winding space between the two ends of the main winding. The secondary winding is then able to form, with the main winding and in the closed position of the closure mechanism, a winding loop generally closed and positioned around the electrical conductor. The use of the main winding and the secondary winding therefore makes it possible to optimize the measurement of the current, by limiting the influence of the free winding space on the measurement of the current. In addition, the proposed current sensor is inexpensive and easy to produce industrially. According to advantageous aspects of the invention, the current sensor further comprises one or more of the following characteristics, taken separately or in any technically possible combination: the closure mechanism comprises a central body around which the secondary winding is arranged; , along the longitudinal axis; the main winding is electrically connected in series with the secondary winding; the diameter of the turns of the secondary winding is greater than or equal to the diameter of the turns of the main winding; in the closed position of the closure mechanism, the distance measured along the longitudinal axis between each end and the secondary winding is less than 1.5 mm, preferably less than 1 mm; the secondary winding comprises, along the longitudinal axis, a central portion and first and second distal portions, while at least one of the distal portions comprises a number of turns per unit length greater than the number of turns per unit length of the central part; the number of turns per unit length of the secondary winding is between 0.1 and 25 turns per millimeter and per layer of turns, preferably between 0.5 and 3 turns per millimeter and per layer of turns; the length of the secondary winding, measured along the longitudinal axis, is between 1 cm and 100 cm, preferably between 20 cm and 50 cm; - The closure mechanism comprises a housing, a minimum width of the housing, measured radially to the longitudinal axis, being greater than 120% of the maximum diameter of the central body, measured radially to the longitudinal axis; the closure mechanism comprises a housing, the housing comprising a movable member capable of being displaced, when the closing mechanism is in the closed position, between a locking position of the closed position of the closing mechanism and a unlocking position of said position. The subject of the invention is also a method for manufacturing a Rogowski loop current sensor for measuring a current flowing in an electrical conductor, the manufacturing method comprising the following steps: winding a main winding having two ends, the manufacture of a clean closing mechanism to connect one end to the other end, the closing mechanism being movable relative to one of the ends between a closed position and an open position, in which the main winding and the closure mechanism form a closed loop around the electrical conductor and an open loop respectively, the two ends being, in the closed position of the closure mechanism, disposed along a longitudinal axis of the closure mechanism and distant one of the other along the longitudinal axis, and the winding of a secondary winding, arranged between the ends of the main winding, in the closed position of the closing mechanism. According to the invention, during the step of winding the secondary winding, the secondary winding comprises a plurality of turns offset relative to each other along the longitudinal axis. According to other advantageous aspects of the invention, the manufacturing method also comprises one or more of the following characteristics, taken separately or in any technically acceptable combination: in the step of manufacturing the closure mechanism, the mechanism closure is manufactured with two winding connection terminals and a central body around which is intended to be disposed the secondary winding; during the steps of winding the main winding and the secondary winding, a wire is wound continuously in a first direction from one of the connection terminals, in order to successively form the secondary winding and the winding. main winding, while the last end of the formed main winding is connected to the other connection terminal; when the last end of the main winding is formed, the wire is wound continuously in a second direction, opposite to the first direction, in order to increase the number of turns of the main and secondary windings and then connected to the said other terminal connection; during the step of winding the main winding, a first wire is wound and forms the main winding with each of its ends connected to a first and a second winding connection terminal, whereas at the manufacturing step of the closure mechanism, the closing mechanism is manufactured with third and fourth winding connection terminals and a central body around which is intended to be disposed the secondary winding, while during the winding step of the secondary winding, a second wire is wound around the central body, and the secondary winding is connected between the third and fourth connection terminal, and while the method comprises the following step: the connection of the second terminal of connection with the fourth connection terminal. The invention will be better understood and other advantages thereof will appear more clearly in the light of the description which follows, given solely by way of nonlimiting example, and with reference to the appended drawings in which: Figure 1 is a schematic representation of an electrical installation comprising three electrical conductors and three current sensors, each sensor being in accordance with a first embodiment of the invention and disposed around a respective electrical conductor; FIG. 2 is a partial perspective view in section of one of the current sensors of FIG. 1, along a plane II visible in FIG. 1, the current sensor comprising a closing mechanism in the open position; FIG. 3 is a partial view in perspective of the current sensor of FIG. 2; - Figure 4 is a view similar to that of Figure 2, wherein the closing mechanism is in the closed position and a movable member is shown in a locking position of the closing mechanism in the closed position. - Figure 5 is a view similar to that of Figure 4, wherein the movable member is in an unlocked position of the closing mechanism in the closed position. FIG. 6 is a flowchart of a method for manufacturing a current sensor according to the first embodiment of the invention, FIG. 7 is a view similar to that of FIG. 4 according to a second embodiment. of the invention; FIG. 8 is a view similar to that of FIG. 3 according to the second embodiment; FIG. 9 is a perspective view of a mechanical connection between a main winding and a secondary winding of the current sensor according to the second embodiment; - Figure 10 is a very schematic representation of the position of two ends of the main winding relative to the secondary winding, according to the second embodiment; FIG. 11 is a flowchart of a manufacturing method according to the second embodiment of the invention; - Figure 12 is a representation similar to that of Figure 10 for a current sensor according to a third embodiment of the invention; and - Figure 13 is a representation similar to that of Figure 10 for a current sensor according to a fourth embodiment of the invention. In the remainder of the description, the expression "substantially equal to" defines a relationship of equality at plus or minus 5%.
    [0003] In FIG. 1, an electrical installation 10 comprises a power supply 12, three electrical conductors 14 forming a three-phase electrical network and three Rogowski loop current sensors 16, each sensor 16 being disposed around a respective electrical conductor 14. The power supply 12 comprises a control unit 17 and is clean, for example, to deliver a low voltage, for example less than 1000 Volts. Each current sensor 16 forms a loop around the corresponding electrical conductor 14. Each current sensor 16 comprises a flexible main body 18 and a closing mechanism 20. Each main body 18 comprises a main winding 22, a winding support 24, a sheath 26, and first 28 and second 30 ends for attachment to the winding mechanism. closure 20, as shown in FIG. 2. The current sensor 16 comprises a secondary winding 32, which comprises a plurality of turns offset relative to one another along a longitudinal axis X. Each closure mechanism 20 comprises a housing 34, inside which are disposed a central body 36 and a printed circuit 38. The closing mechanism 20 is able to connect the first 28 and second 30 fixing ends. The main winding 22 has third 42 and fourth 44 ends, respectively positioned near the first 28 and second 30 attachment ends. The main winding 22 is wound around the winding support 24.
    [0004] The closing mechanism 20 is movable with respect to the fourth end 44, between a closed position and an open position respectively, in which the main winding 22 and the closure mechanism 20 form a closed loop around the electrical conductor 14 and respectively a open loop. Thus, in the closed position of the closing mechanism 20, the first 28 and second 30 ends, as well as the third 42 and fourth 44 ends, are arranged along the longitudinal axis X of the closing mechanism 20 and distant one of the another according to this axis. The sheath 26 is preferably a heat-shrinkable sheath which extends generally from the third end 42 to the fourth end 44 around the main winding 22.
    [0005] The first fastening end 28 comprises a holding torus 46 capable of being positioned inside the casing 34, in order to maintain the first end 28 in position relative to the casing 34 and, more generally, with respect to the closing mechanism 20. In FIG. 2, it appears that the first fastening end 28 is fixed to the central body 36. The first 28 and second 30 fastening ends, as well as the third 42 and fourth 44 ends, are, in FIG. along the longitudinal axis X of the closing mechanism 20 and the central body 36. The second end 30 comprises a fastening tip 50, which surrounds the fourth end 44. The attachment end 50 is adapted to be inserted into the central body 36. The second end 30 is removable relative to the central body 36 and the closing mechanism 20. The secondary winding 32 is disposed around the central body 36. The secondary winding No. 32 is electrically connected in series with the main winding 22. The secondary winding 32 has a number of turns per unit length of between 0.1 and 25 turns per millimeter per layer, preferably between 0.5 and 3. turns per millimeter and per layer. Indeed, the secondary winding 32 is adapted to comprise a layer of turns, as shown in Figure 2, or, alternatively, several layers of turns superimposed on each other around the central body 36.
    [0006] More precisely, the main winding 22 and the secondary winding 32 are in the form of first and second tubes, and the following ratio is obtained between the main winding 22 and the secondary winding 32: a = S1 * N1 * L2 / (L1 * S2 * N2) = 1, (Equation 1), with S1 representing the section of the first tube, in a plane perpendicular to the first tube, N1 representing the number of turns of the main winding 22, L1 representing the length of the main winding 22, S2 representing the section of the second tube, in a plane perpendicular to the longitudinal axis X, N representing the number of turns of the secondary winding 32 and L2 representing the length measured along the longitudinal axis X of the secondary winding 32. The ratio a is between 0.9 and 1.1. The length of the secondary winding 32, measured along the longitudinal axis X, is between 2 millimeters (mm) and 60 mm, preferably between 5 mm and 15 mm.
    [0007] The diameter of the turns of the secondary winding 32 is greater than or equal to the diameter of the turns of the main winding 22. In FIGS. 2 and 3, the diameter of the turns of the secondary winding 32 is between 200% and 300% of the diameter of the turns of the main winding 22.
    [0008] Alternatively, the number of turns per unit length at the ends 42, 44 of the main winding 22 is greater than the number of turns per unit length over the remainder of the main winding 22. The housing 34 has a width minimum 1-min, measured perpendicular to the longitudinal axis X, greater than 120% of the maximum diameter of the central body 36, measured radially to the longitudinal axis X. In addition, and as shown in Figures 4 and 5, the housing 34 comprises a movable member 52 able to be displaced, when the closing mechanism 20 is in the closed position, between a locking position of the closing mechanism 20 in the closed position, visible in FIG. 4, and an unlocking position of the closed position of the closure mechanism 20, visible in Figure 5. The housing 34 also comprises a protrusion 53 projecting therefrom and provided with a first hole 53A through. The central body 36 comprises first 54 and second 56 flanges, between which the secondary winding 32 extends. The diameters of the first 54 and second 56 flanges, measured radially to the longitudinal axis X, are greater than the maximum diameter of the flange. secondary winding 32 also measured radially to the longitudinal axis X. The central body 36 comprises a hole 58 for receiving the end piece 50 and the second end 30, inside which the end piece 50 is able to be immobilized in the closed position of the closing mechanism 20. The central body 36 also comprises two terminals 60, 62 for connection to the circuit 38. The printed circuit 38 is connected to the terminals 60, 62. In addition, the housing 34 includes a processing module, not shown, connected to terminals 60, 62 of connection and adapted to determine the intensity of the current flowing through the electrical conductor 14 around which is disposed the sensor 16, depending on the current t flowing through the main winding 22 and the secondary winding 32. In the closed position of the closing mechanism 20, the distance measured along the longitudinal axis X, between the third end 42 of the main winding and one end of the winding. secondary winding 32 is less than 1.5 mm, preferably less than 1 mm, more preferably substantially equal to 0.6 mm. Similarly, in the closed position of the closing mechanism 20, the distance measured along the longitudinal axis X between the fourth end 44 of the main winding and the other end of the secondary winding is less than 1.5 mm, preferably less than 1 mm, more preferably substantially equal to 0.6 mm.
    [0009] By way of example, the distance measured along the longitudinal axis X, between the third end 42 and the secondary winding 32 is equal to 0.6 mm, while the distance measured along the longitudinal axis X, between the fourth end 44 of the main winding and the secondary winding 32 is zero. The retaining torus 46 is able to be positioned inside the casing 34, more precisely between a wall of the casing 34 and the central body 36, along the longitudinal axis X. The torus 46 is able to hold the first end of the casing fixing 28 inside the housing 24, that is to say to maintain the position of the third end 42 relative to the secondary winding 32. The torus 46 can limit a change in the position of the first 28 and third 42 ends relative to the central body 36, when a force is exerted on the main body 18 to move the first end 28 and the third end 42, along the longitudinal axis X. The attachment end 50 has a shape generally frustoconical, complementary to that of the orifice 58. The tip 50 is immobilized relative to the closing mechanism 20 by an elastic function on the attachment end 50. In addition, the tip 50 comprises a shoulder 59, adapted to be wedged in the orifice 58, in the closed configuration of the closure mechanism, the shoulder 59 being of revolution about the longitudinal axis X and having a triangular section in a vertical plane having the longitudinal axis X .
    [0010] The movable member 52 includes a second through hole 64, which is aligned with the first through hole 53A when in the locking position of the closure mechanism in the closed position. The movable member 52 is clean, in the closed position of the closure mechanism 20 and in its locking position, visible in Figure 4, to obstruct a portion of the orifice 58 to maintain the closing mechanism 20 in the closed position, that is to say the second end 30, the fourth end 44 and the end piece 50, inside the orifice 58. In the same way, when it is in the unlocking position, visible in FIG. and that the closure mechanism is in the closed position, the movable member 52 releases the orifice 58 and the closing mechanism 20 is able to be moved in the open position following the application of a force to remove the second end 30, and thus the attachment end 50, of the orifice 58.
    [0011] Advantageously, in the closed position of the closure mechanism 20 and in the locking position of the movable member 52, a sealing mechanism, not shown, such as a wire whose two ends are connected by a lead, is suitable for insertion through the through holes 53A and 64, to lock the movable member 52 in its locking position of the closure mechanism 20 in the closed position. Figure 6 shows a method of manufacturing the current sensor 16. In a first step 100, the central body 36 is manufactured. Then, during a fixing step 102, the winding support 24 is fixed to the closure mechanism 20. More precisely, one end of the winding support 24 corresponding to the first end 28 is fixed to the closure mechanism 20. Next during a step 104 of winding the main winding 22 and the secondary winding 32, a first wire is wound continuously in a first direction, from one of the terminals 60 of connection, to form successively the main winding 22 and the secondary winding 32. During the winding step 104, the last end of the main winding 22 formed, that is to say the fourth end 44 of the main winding 22 is connected to the other connection terminal 62. More precisely, once the fourth end 44 is formed, the first wire is continuously wound in a second direction, opposite to the first direction, in order to increase the number of turns primary and secondary windings 22 and 32, and the first wire is then connected to the other connection terminal 62. In a variant, a conductive element is disposed through the main body 18, and more precisely through the winding support 24, and during the winding step 104, a first wire is wound continuously in a first direction from one of the connection terminals 60 to successively form the main winding 22 and the secondary winding 32. Then, the fourth end 44 of the main winding 22 is connected to the conductive element, which then connects the fourth end 44 to said other connection terminal 62. The conductive element is for example a copper wire. In a step 106, the retaining torus 46 is formed, the sheath 26 is positioned around the main winding 22 and the tip 50 is fixed on the second end 30.
    [0012] Then, in a next step 108, the printed circuit 38 is connected to the connection terminals 60, 62. Then, during a fixing step 110, the housing 34 is positioned around the central body 36 and the secondary winding 32, as well as the printed circuit 38, to form the closing mechanism 20.
    [0013] The manufacturing method presented above allows a simplified winding of the current sensor 16, since the main windings 22 and secondary 32 are formed from the same wire. In addition, the distance between, on the one hand, the third 42 and fourth 44 ends and, on the other hand, the secondary winding 32 is less than 1.5 mm, preferably less than 1 mm. Thus, the distance between the main 22 and secondary 32 windings is minimized. Advantageously, the ratio between the diameter of the main winding 22 and the diameter of the secondary winding 32 is less than 300%. Thus, an opening extending in directions perpendicular and parallel to the longitudinal axis X between, on the one hand, the third 42 and fourth 44 ends and, on the other hand, the secondary winding 32 is reduced, which improves the measurement of the current flowing through the corresponding electrical conductor 14. The secondary winding 32 is disposed in a free winding space of the main winding 22, which extends, along the longitudinal axis X, between the third 42 and fourth 44 ends and allows to create a winding continuity with the winding. main winding 22, to improve the measurement of the current flowing through the electrical conductor 14. The closure mechanism 20 is movable relative to the fourth end 44, which allows to position the current sensor 16 around the one of the electrical conductors 14 and to move it around another electrical conductor 14. The first 54 and second 56 edges make it possible to better maintain the secondary winding 32 around the central body 36. The frustoconical shape of the endpiece 50 makes it possible to ensure a better mechanical positioning of the endpiece 50 in the orifice 58. The shoulder 59 makes it possible to offer a better hold of the endpiece 50 in the orifice 58, in the closed position of the end mechanism. In a second embodiment, shown in FIGS. 7 to 10, elements similar to those of the first embodiment bear the same references increased by 200. Thus, a current sensor 216 comprises a main body 218 and a mechanism 220. Each main body 218 comprises a main winding 222, a winding support 224, a sheath 226 and first 228 and second 230 ends of attachment to the closing mechanism 220.
    [0014] In addition, each closure mechanism 220 comprises a housing 234 inside which are disposed a central body 236 and a printed circuit 238. A secondary winding 232 is positioned around the central body 236. The closing mechanism 220 and the central body 236 extend along the longitudinal axis X. In the following, only the differences between the first and second embodiments will be presented. The winding support 224, and more specifically the main body 218, comprises, at the first end 228, an element 268 comprising a first 270 and a second 272 terminals of the main winding 222. More specifically, the main winding 222 includes third 242 and fourth 244 ends and is wound from the first connection terminal 270, to the second end 230 and from the second end 230 to the second connection terminal 272. Thus, the fourth end 244 is connected to the second connection terminal 272.
    [0015] The central body 236 comprises third 274 and fourth 276 winding connection terminals. In addition, the secondary winding 232 is connected between the third 274 and fourth 276 connection terminals, and extends between a first flange 254 receiving the third 274 and fourth 276 connection terminals and a second flange 256.
    [0016] Thus, the current sensor 216 comprises four connection terminals 270, 272, 274, 276. The four connection terminals 270, 272, 274, 276 are substantially aligned with each other, in a plane perpendicular to the axis longitudinal X. The printed circuit 238 is adapted to connect the second terminal 272 to the fourth terminal 274, to connect the main winding 222 and the secondary winding 232 in series. A processing unit, not shown, is connected between the first 270 and third 274 connection terminals and is adapted to measure the current flowing through the corresponding electrical conductor, when the closing mechanism 220 is in the closed position.
    [0017] As shown in FIGS. 8 and 9, the terminals 270, 272, 274, 276 are substantially aligned and, as can be seen in FIG. 10, the distance measured along the longitudinal axis X between the third end 242 and one end of the winding. secondary 232 is substantially zero. In addition, in FIG. 10, the distance measured along the longitudinal axis X between the fourth end 244 and the other end of the secondary winding 232 is also substantially zero. A method of manufacturing the current sensor 216 is shown in FIG.
    [0018] A first step 300 consists in assembling the connection element 268 with the winding support 224. Then, during a step 302, the main winding 222 is wound, and its ends 242, 244 are respectively connected to the first 270 and second 272 connection terminals. More specifically, a first wire is wound, in a first direction of the X axis, around the winding support 224, from the first connection terminal 270, to forming the main winding and in particular the third 242 and fourth 244 ends. . Then, once the fourth end is formed, the first wire is wound in a second direction of the X axis, opposite the first direction, to increase the number of turns of the main winding 222, and is then connected to the second terminal 272. In a variant, the winding support 224 is traversed by a conductive element, which connects the fourth end 244 and the second terminal 272. Then, during a step 304, the sheath 226 is positioned around the main winding 222 and the attachment end 250 is fixed on the end 230. Then, in a step 306, the central body 236 is manufactured. In a next step 308, a second wire is wound around the central body 236, to form the secondary winding 232. The second wire is wound in a first direction from the third connection terminal 274 to the second flange 256 and, in a second direction, opposite the first direction, from the second flange 256 to the fourth connection terminal 276. The secondary winding 232 is thus connected between the third 274 and fourth 276 connection terminals. During a step 310 assembly, the main body 218, and more precisely the first end 228, is assembled with the central body 236 so that the first 270, second 272, third 274 and fourth 276 terminals of In a step 312, the printed circuit 238 is positioned so that the connection terminals 270, through to connect the second 272 and fourth 274 connection terminals together. Finally, during a step 314, the housing 234 is fixed around the central body 236 and the printed circuit 238. During the winding steps 302, 308 of the main winding 222 and the secondary winding 232, and more precisely, during winding in the first direction and then in the second direction, the diameter of the coiled turns for the first direction and the diameter of the coiled turns for the second direction are identical. As a variant, the diameter of coiled turns for the first direction and the diameter of the coiled turns for the second direction are different.
    [0019] The advantages presented for the first embodiment apply to the second embodiment. The current sensor 216 makes it possible to improve the measurement of the current flowing in the corresponding electrical conductor, since, thanks to the use of the four terminals 270, 272, 274, 276, the distance between the third end 242 and the secondary winding 232 is zero, which reduces the size of the opening presented in the description of the first embodiment. In FIG. 12, a third embodiment of the invention is shown and the elements similar to those of the first embodiment bear the same references increased by 400.
    [0020] In the following, only the differences between the third embodiment and the first embodiment will be presented. Thus, a current sensor 416 comprises a closure mechanism 420 and a main body 418. The main body 418 comprises a main winding 416. The closure mechanism 420 comprises a central body 436 around which is disposed a secondary winding 432. The FIG. 12 corresponds to the closed position of the closing mechanism 420. The distance measured along the longitudinal axis X between the third end 442 and one end of the secondary winding 432 is greater than 1 mm. Similarly, the distance measured along the longitudinal axis X between the fourth end 444 and the other end of the secondary winding 432 is greater than 1 mm.
    [0021] Secondary winding 432 does not have the same number of turns per unit length over its entire length. The secondary winding 432 comprises, along the longitudinal axis X, a central portion 432A and first 432B and second 432C distal portions. The distal portions 432B and 432C then comprise a number of turns per unit length greater than the number of turns per unit length of the central portion 432A. The length, measured along the longitudinal axis X, of the distal portions 432B and 432C is for example between 5% and 100% of the length of the central portion 432A. The advantages presented for the first embodiment apply to the third embodiment.
    [0022] The current sensor 416 and more precisely the secondary winding 432 thus comprises compensation turns at the distal portions 432B and 432C, which make it possible to further reduce the error in the measurement of the current, linked to an opening which extends perpendicularly and parallel to the longitudinal axis X between, on the one hand, the third 442 and fourth 444 ends and, on the other hand, the secondary winding 432.
    [0023] FIG. 13 corresponds to a fourth embodiment of the invention, in which elements similar to those of the third embodiment bear the same references increased by 100. According to the fourth embodiment, a secondary winding 532 is formed from a wire whose diameter is such that the space between consecutive turns, measured along the longitudinal axis X, is substantially zero. The diameter is for example equal to 1.2 mm. Thus, this configuration makes it possible to limit a movement of the turns of the secondary winding 532 along the longitudinal axis X. In addition, in this fourth embodiment, the secondary winding 532 comprises a central portion 532A and two distal portions 532B. and 532C, and the number of turns per unit length of the distal portions 532B, 532C is greater than the number of turns per unit length of the central portion 532A. In addition, the diameter of the turns of the distal portions 532B, 532C is different depending on the turns. Indeed, some turns of the distal portions 532B, 532C are superimposed on other turns of said distal portions. The advantages presented for the third embodiment apply to the fourth embodiment. The current sensor 516 makes it possible to limit a displacement of the turns of the secondary winding 532, along the longitudinal axis X, and consequently to better maintain the secondary winding 532 around the central body 536.
    权利要求:
    Claims (15)
    [0001]
    CLOSURE.-Current sensor (16; 216; 416; 516) Rogowski loop for measuring a current flowing in an electrical conductor (14), the current sensor comprising: - a main winding (22; 222; 422 522) having two ends (42, 44; 242, 244; 442, 444; 542, 544); - a closing mechanism (20; 220; 420; 520) adapted to connect one end (42; 242; 442; 542) of the main winding at the other end (44; 244; 444; 544), the closure mechanism being movable relative to one of the ends (44; 244; 444; 544) between a closed position and an open position, in which the main winding (22; 222; 422; 522) and the closing mechanism (20; 220; 420; 520) form a closed loop around the electrical conductor (14) and an open loop respectively; the two ends (42, 44; 242, 244; 442, 444; 542, 544) being, in the closed position of the closing mechanism, disposed es along a longitudinal axis (X) of the closure mechanism (20; 220; 420; 520) and spaced apart from each other along the longitudinal axis (X), and - a secondary winding (32; 232; 432; 532) disposed between the ends (42, 44; 242, 244; 442, 444); 542, 544) of the main winding (22; 222; 422; 522) in the closed position of the closing mechanism (20; 220; 420; 520), characterized in that the secondary winding (32; 232; 432; 532) comprises a plurality of turns offset with respect to one another along the longitudinal axis (X).
    [0002]
    2. A sensor according to claim 1, characterized in that the closure mechanism comprises a central body (36; 236; 436; 536) around which the secondary winding (32; 232; 432; longitudinal axis (X).
    [0003]
    3. Sensor according to one of the preceding claims, characterized in that the main winding (22; 222; 422; 522) is electrically connected in series with the secondary winding (32; 232; 432; 532).
    [0004]
    4. Sensor according to one of the preceding claims, characterized in that the diameter of the turns of the secondary winding (32; 232; 432; 532) is greater than or equal to the diameter of the turns of the main winding (22; 222; 422; 522).
    [0005]
    5. Sensor according to one of the preceding claims, characterized in that, in the closed position of the closing mechanism (20; 220), the distance measured along the longitudinal axis (X) between each end and the secondary winding ( 32; 232; 432; 532) is less than 1.5 mm, preferably less than 1 mm.
    [0006]
    6. Sensor according to one of claims 1 to 5, characterized in that the secondary winding (432; 532) comprises, along the longitudinal axis (X), a central portion (432A; 532A) and first ( 432B; 532B) and second (432C; 532C) distal portions, and in that at least one of the distal portions (432B, 432C; 532B, 532C) comprises a number of turns per unit length greater than the number of turns per unit length of the central portion (432A; 532A).
    [0007]
    7. Sensor according to one of the preceding claims, characterized in that the number of turns per unit length of the secondary winding (32; 232; 432; 532) is between 0.1 and 25 turns per millimeter and by layer of turns, preferably between 0.5 and 3 turns per millimeter and per layer of turns.
    [0008]
    8. A sensor according to one of the preceding claims, characterized in that the length of the secondary winding (32; 232; 432; 532), measured along the longitudinal axis (X), is between 2 mm and 60 mm, preferably between 5 mm and 15 mm.
    [0009]
    9. A sensor according to claim 2, characterized in that the closing mechanism (20; 220; 420; 520) comprises a housing (34; 234), a minimum width (Lmin) of the housing, measured radially to the axis longitudinal (X), being greater than 120 (3/0 of the maximum diameter of the central body (36; 236; 436; 536), measured radially to the longitudinal axis (X).
    [0010]
    10. A sensor according to one of the preceding claims, characterized in that the closing mechanism (20; 220; 420; 520) comprises a housing (34; 234), the housing comprising a movable member (52) adapted to be moved, when the closing mechanism (20; 220; 420; 520) is in the closed position, between a locking position of the closed position of the closing mechanism (20; 220; 420; 520) and an unlocking position of said position.
    [0011]
    11. A method for producing a current sensor (16; 216; 416; 516) with a Rogowski loop for measuring a current flowing in an electrical conductor, the manufacturing method comprising the following steps: winding ( 104; 302) of a main winding (22; 222; 422; 522) having two ends (42,44; 242,244; 442,444; 542,544); - the manufacture (100,108,110) of a closing mechanism (20; 220; 420; 520) adapted to connect one end (42; 242; 442; 542) to the other end (44; 244; 444; 544), the closure mechanism being movable by one of the ends (44; 244; 444; 544) between a closed position and an open position, in which the main winding (22; 222; 422; 522) and the closing mechanism (20; 220; 420; 520) form a closed loop around the electrical conductor (14) and an open loop respectively, the two ends (42, 44; 242, 244; 442, 444; 42, 544) being, in the closed position of the closure mechanism, arranged along a longitudinal axis (X) of the closure mechanism (20; 220; 420; 520) and spaced apart from each other along the longitudinal axis (X), and - the winding (104; 308) of a secondary winding (32; 232; 432; 532) disposed between the ends of the main winding (22; 222; 422; 522) in the closed position of the closing mechanism (20; 220; 420; 520), characterized in that during the winding step (104; 308) of the winding secondary winding, the secondary winding (32; 232; 432; 532) comprises a plurality of turns offset relative to one another along the longitudinal axis (X).
    [0012]
    12. A process according to claim 11, characterized in that, during the manufacturing step (100, 108, 110) of the closure mechanism (20), the closing mechanism (20) is manufactured with two terminals ( 60, 62) and a central body (36) around which the secondary winding (32) is to be arranged.
    [0013]
    13.- Method according to claim 12, characterized in that, during the winding steps (104) of the main winding and the secondary winding, a wire is wound continuously in a first direction, since one of the connection terminals (60) to successively form the secondary winding (32) and the main winding (22), and that the last end (44) of the main winding (22) formed is connected to the other connection terminal (62) .35
    [0014]
    14. A method according to claim 13, characterized in that when the last end of the main winding (22) is formed, the wire is wound continuously in a second direction, opposite the first direction, to increase the number of turns of the main (22) and secondary (32) windings, then connected to said other connection terminal (62).
    [0015]
    15.- A method according to claim 11, characterized in that - during the winding step (302) of the main winding (222), a first wire is wound and forms the main winding (222) with each of its ends (242, 244) connected to a first (270) and a second (272) winding connection terminals, - during the manufacturing step (306, 312, 314) of the closing mechanism (220), the closing mechanism (220) is manufactured with third (274) and fourth (276) winding terminals and a central body (236) around which the secondary winding (232) is to be arranged, the winding step (308) of the secondary winding (232), a second wire is wound around the central body (236), and the secondary winding (232) is connected between the third (274) and the fourth ( 276), and in that the method comprises the following step: - the connection (312) of the second born e connection (272) with the fourth connection terminal (276).
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    同族专利:
    公开号 | 公开日
    CN104730314B|2019-01-08|
    FR3015687B1|2016-01-22|
    CN104730314A|2015-06-24|
    EP2887076A1|2015-06-24|
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    CN202796299U|2012-07-03|2013-03-13|深圳市创银科技股份有限公司|Rogowski coil|FR3044096B1|2015-11-23|2017-12-01|Schneider Electric Ind Sas|CURRENT SENSOR AND DEVICE FOR MEASURING AN ELECTRICAL CURRENT|
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    法律状态:
    2015-06-25| PLFP| Fee payment|Year of fee payment: 3 |
    2016-12-12| PLFP| Fee payment|Year of fee payment: 4 |
    2017-12-18| PLFP| Fee payment|Year of fee payment: 5 |
    2019-12-17| PLFP| Fee payment|Year of fee payment: 7 |
    2020-12-29| PLFP| Fee payment|Year of fee payment: 8 |
    2021-12-27| PLFP| Fee payment|Year of fee payment: 9 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1363463A|FR3015687B1|2013-12-23|2013-12-23|ROGOWSKI LOOP CURRENT SENSOR AND METHOD FOR MANUFACTURING SUCH CURRENT SENSOR|FR1363463A| FR3015687B1|2013-12-23|2013-12-23|ROGOWSKI LOOP CURRENT SENSOR AND METHOD FOR MANUFACTURING SUCH CURRENT SENSOR|
    EP14199532.4A| EP2887076A1|2013-12-23|2014-12-22|Current sensor with Rogowski coil and a method for manufacturing such a current sensor|
    CN201410811604.4A| CN104730314B|2013-12-23|2014-12-23|Rogowski coil current sensor and its manufacturing method|
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