Current transformer

Abstract

This invention relates to a current converter (1), comprising a head tank (2) and a head tank cover (3), both the head tank and the head tank cover comprising or composed of conductive material, and at least one primary winding (4) for conducting the current to be measured, the primary winding (4) comprising at least one primary bar (4.1) and a secondary winding (5) wound around the at least one primary bar (4.1), the primary winding (4) and the secondary winding (5) being arranged within a cavity defined within the head tank (2) and the head tank cover (3), the head tank cover (3) being arranged on the head tank (2), wherein the head... The upper flange (9) of the oil tank (2) is configured to abut against the cover flange (18) of the head oil tank cover (3) for fluid tight sealing. The head oil tank (2) and the head oil tank cover (3) respectively include primary terminals (12, 19) for electrical contact with the primary winding (4). One or more connection points (13, 23) are respectively provided in the head oil tank (2) and the head oil tank cover (3) to electrically connect the corresponding end of the primary winding (4) to the head oil tank (2) or to the head oil tank cover (3). An electrical insulating ring (24) is arranged between the cover flange (18) and the upper flange (9).

Description

Technical Field

[0001] The present invention relates to a current converter according to claim 1. Background Technology

[0002] Conventional converters typically have primary circuitry that is separate from the rest of the converter. This introduces limitations in design, assembly, and materials.

[0003] The primary circuit of a conventional design consists of several parts, all separate from the converter: the primary bar, terminals, return bars, and connectors. This leads to time-consuming assembly, potential human error, and technical limitations. A major limitation of this solution is that the primary circuit of a conventional design cannot have more than four turns.

[0004] In an exemplary conventional converter, the primary rod is housed inside an aluminum tube filled with resin. Insulators (insulating sleeves) and oil-tight sealants (O-rings) exist between the converter tube and the tank. The terminals of the primary rod are insulated from the tank, and the windings are completed using copper rods and return rods. Summary of the Invention

[0005] The purpose of this invention is to provide an improved current converter.

[0006] This objective is achieved by the current converter according to claim 1.

[0007] Advantageous embodiments of the present invention are the subject of the dependent claims.

[0008] The current converter according to the present invention includes a head tank and a head tank cover, both of which comprise or are composed of conductive material, for conducting at least one primary winding for conducting the current to be measured. The primary winding includes at least one primary bar and a secondary winding wound around the at least one primary bar. The primary and secondary windings are arranged within cavities defined within the head tank and the head tank cover. The head tank cover is disposed on the head tank. The upper flange of the head tank is configured to abut against the cover flange of the head tank cover for a fluid-tight seal. The head tank and the head tank cover each include a primary terminal for electrical contact with the primary winding. One or more connection points are respectively provided within the head tank and the head tank cover to electrically connect corresponding ends of the primary winding to the head tank or to the head tank cover. An electrically insulating ring is arranged between the cover flange and the upper flange.

[0009] In an exemplary embodiment, the primary winding includes a plurality of primary bars extending in parallel and a plurality of loop wires connecting one corresponding primary bar to another corresponding primary bar, wherein the loop wires are wound around the secondary winding.

[0010] In an exemplary embodiment, the return lead is positioned within a cavity defined within the head tank and the head tank cover. Integrating the entire primary winding with the head lead reduces cost and manufacturing time, and allows for more efficient use of materials.

[0011] In an exemplary embodiment, the primary winding comprises or is composed of paper-insulated copper wire, such as multilayer paper-insulated copper conductors. The paper may be electrically crepe insulating paper. Alternative insulation materials for the conductor may be kraft paper (i.e., insulating paper), thermally upgraded kraft paper, cotton, electrical insulation materials produced from mixtures of high-quality electrical-grade cellulose pulp, and mesh binders made of high-temperature aramid polymers and polyethylene terephthalate.

[0012] In an exemplary embodiment, the head tank and / or the head tank cover comprises a bowl shape.

[0013] In an exemplary embodiment, the head tank and / or the head tank cover have a rectangular cross-section with rounded corners.

[0014] In an exemplary embodiment, the head tank tapers downward relative to the operating position, and / or the head tank cover tapers upward relative to the operating position.

[0015] In an exemplary embodiment, the head tank includes an opening at the bottom, and / or the head tank cover includes an opening at the top.

[0016] In an exemplary embodiment, the head tank may be configured to be mounted at the bottom of the top of an insulator, and the top of the insulator may be configured to guide the terminals of the secondary winding through.

[0017] In an exemplary embodiment, the head tank includes a platform providing a widened space below the upper flange to receive the loop conductor wound around the secondary winding.

[0018] In an exemplary embodiment, the primary terminal includes a first primary terminal and a second primary terminal, wherein the first primary terminal extends substantially radially from the head tank relative to the longitudinal axis, and / or wherein the second primary terminal extends substantially radially from the head tank cover relative to the longitudinal axis.

[0019] In an exemplary embodiment, the first primary terminal extends from the upper flange and / or the second primary terminal extends from the cover flange.

[0020] In an exemplary embodiment, one of the connection points is disposed on the platform.

[0021] In an exemplary embodiment, the connection point includes a thickened portion, wherein the connection point is provided with one or more threaded holes to allow for fastening of the end of the primary winding or a cable lug attached to the end of the primary winding by means of corresponding screws.

[0022] In an exemplary embodiment, one or more operating protrusions extend radially from the head tank.

[0023] In an exemplary embodiment, two operational protrusions are arranged opposite each other near the upper flange.

[0024] In an exemplary embodiment, the operating protrusion includes a corresponding operating hole configured to connect a D-shaped shackle.

[0025] In an exemplary embodiment, the operating hole extends substantially in a tangential direction relative to the longitudinal axis.

[0026] In an exemplary embodiment, the second primary terminal is bent such that when the head tank cover is disposed on the head tank, the second primary terminal is positioned at the same height as the first primary terminal.

[0027] In an exemplary embodiment, the head tank cover is mounted on the head tank such that the first primary terminal and the second primary terminal extend in opposite directions.

[0028] In an exemplary embodiment, the cover flange includes a plurality of cover flange holes and the upper flange includes a plurality of corresponding upper flange holes, the cover flange holes and the upper flange holes being configured to allow the head tank cover to be fastened to the head tank by screws.

[0029] In an exemplary embodiment, the upper flange hole or the cover flange hole is threaded and / or constructed as a blind hole.

[0030] In an exemplary embodiment, two or more primary windings are provided in parallel, wherein the return conductor of one of the primary windings is guided around one side of the secondary winding, and the return conductor of the other primary winding is guided around the opposite side of the secondary winding.

[0031] In an exemplary embodiment, the upper flange and the cover flange include corresponding circumferential recesses, in which corresponding O-rings are arranged to seal the upper flange and the cover flange against the insulating ring.

[0032] In an exemplary embodiment, a corresponding electrically insulating bushing is arranged in each of the cover flange holes and / or each of the upper flange holes, and the screw is guided through the bushing.

[0033] In an exemplary embodiment, the insulating ring and / or the bushing are made of PTFE, polyoxymethylene, or HDPE. Attached Figure Description

[0034] The features, characteristics, and advantages of the present invention described above, as well as the methods of implementing them, will become apparent from the detailed description of the embodiments given below, which will be explained with reference to the accompanying drawings.

[0035] Figure 1 This is a schematic diagram of an exemplary implementation of a current converter.

[0036] Figure 2 This is a schematic cross-sectional view of a current converter.

[0037] Figure 3 This is another schematic cross-sectional view of a current converter.

[0038] Figure 4 This is a schematic diagram of the head oil tank of a current converter.

[0039] Figure 5 This is a schematic cross-sectional view of the head fuel tank.

[0040] Figure 6 This is a schematic top view of the front fuel tank.

[0041] Figure 7 This is a schematic diagram of the head oil tank cover of the current converter.

[0042] Figure 8 This is a schematic cross-sectional view of the front fuel tank cover.

[0043] Figure 9 This is a schematic top view of the head tank with primary and secondary windings, and

[0044] Figure 10 This is a schematic detail diagram of a current converter.

[0045] The corresponding components are marked with the same reference symbol in all drawings. Detailed Implementation

[0046] Figure 1 This is a schematic diagram of an exemplary embodiment of the current converter 1. Figure 2 and Figure 3This is a schematic cross-sectional view of a current transducer 1. The current transducer 1 includes a head, which comprises a head tank 2 and a head tank cover 3, and a primary winding 4 for conducting the current to be measured. The primary winding 4 includes a plurality of primary bars 4.1 and a plurality of return wires 4.2. The primary bars extend in parallel, and the return wires connect one corresponding primary bar 4.1 to another corresponding primary bar. The primary winding 4 and, in particular, its return wires 4.2 are positioned within the head of the current transducer 1. The primary winding 4 may comprise paper-insulated copper wire. A secondary winding 5 is wound around the primary bars 4.1 and is used to measure the current flowing through the primary winding 4. The return wires 4.2 are wound around the secondary winding 5.

[0047] Figure 4 This is a schematic diagram of the head fuel tank 2. Figure 5 This is a schematic cross-sectional view of the head oil tank 2. Figure 6 This is a schematic top view of the head fuel tank 2.

[0048] The head tank 2 comprises a conductive material, such as metal, and is substantially shaped like a bowl with a rectangular cross-section, the rectangular cross-section having rounded corners and tapering downwards relative to the operating position. In other embodiments, the head tank 2 may have different shapes. The head tank 2 includes an opening 6 at the bottom to guide the terminals of the secondary winding 5 through. Furthermore, a lower flange 7 may be provided at the bottom of the head tank, configured to mount the head tank 2 on top of the insulator 8, to guide the terminals of the secondary winding 5 through the top of the insulator. The upper flange 9 of the head tank 2 is configured to engage with the head tank cover 3. Additionally, the head tank 2 includes a platform 10 providing a widened space 11 below the upper flange 9 to receive the return conductor 4.2. The head tank 2 may include a first primary terminal 12 incorporated in the casting of the head tank 2, the first primary terminal for electrically contacting the current converter 1 and the primary winding 4. A first primary terminal 12 may extend substantially radially from the head reservoir 2, for example from the upper flange 9, relative to the longitudinal axis A like a protrusion, and the first primary terminal may include a hole for allowing wires to be screwed to the first primary terminal 12. One or more connection points 13 are provided within the head reservoir 2 to electrically connect corresponding ends of the primary winding 4 to the head reservoir 2. Connection points 13 may be provided on the platform 10 and may include portions with increased thickness relative to the rest of the platform. One or more threaded holes may be provided within the connection points 13 to allow for fastening of the ends of the primary winding 4 or cable lugs attached to the ends of the primary winding by means of corresponding screws 16, such as M10 screws. In an exemplary embodiment, one or more operating protrusions 14 may extend radially from the head reservoir 2, particularly two operating protrusions 14 arranged opposite each other near the upper flange 9. Operating protrusions 14 may include corresponding operating holes 15 allowing connection of D-shaped shackles. Operating holes 15 may extend substantially tangentially relative to the longitudinal axis A.

[0049] Figure 7 This is a schematic diagram of the head fuel tank cap 3. Figure 8 This is a schematic cross-sectional view of the head fuel tank cover 3.

[0050] The head tank cover 3 comprises a conductive material, such as metal, and is substantially shaped like a bowl with a rectangular cross-section, the rectangular cross-section having rounded corners and tapering upwards relative to the operating position. In other embodiments, the head tank cover 3 may have different shapes. The head tank cover 3 includes a cover opening 17 at the top, for example, to connect to a bellows and / or other fittings. The cover flange 18 of the head tank cover 3 is configured to engage with the upper flange 9 of the head tank 2. The head tank cover 3 may include a second primary terminal 19 incorporated in a casting of the head tank cover 3, the second primary terminal for electrically contacting the other end of the current converter 1 and the primary winding 4. The second primary terminal 19 may extend substantially radially from the head tank cover 3, for example from the cover flange 18, relative to the longitudinal axis A like a protrusion, and the second primary terminal may include a hole for allowing wires to be screwed to the second primary terminal 19. The second primary terminal 19 may be bent so that when the head tank cover 3 is arranged on the head tank 2, the second primary terminal is positioned at the same height as the first primary terminal 12. In a preferred embodiment, the head tank cover 3 can be mounted on the head tank 2 such that the first primary terminal 12 and the second primary terminal 19 extend from the current converter 1 in opposite directions.

[0051] The cover flange 18 may include a plurality of cover flange holes 20 and the upper flange 9 may include a plurality of corresponding upper flange holes 21 to allow the head tank cover 3 to be fastened to the head tank 2 by screws 22. The upper flange holes 21 or the cover flange holes 20 may be threaded and may be configured as blind holes.

[0052] The head tank cover 3 has one or more cover connection points 23 for electrically connecting the corresponding ends of the primary winding 4 to the head tank cover 3. The cover connection point 23 may include a portion with increased thickness relative to the rest of the head tank cover 3 at this location along the longitudinal axis A. The cover connection point 23 may have one or more threaded holes to allow for fastening of the ends of the primary winding 4 or cable terminals attached to the ends of the primary winding 4 by means of corresponding screws 29, such as M10 screws.

[0053] When the head oil tank cover 3 is installed on the head oil tank 2, the insulating ring 24 can be placed between the cover flange 18 and the upper flange 9 to make the head oil tank cover 3 electrically insulated from the head oil tank 2.

[0054] Figure 9 This is a schematic top view of the head oil tank 2 having a primary winding 4 and a secondary winding 5. In this configuration, two primary windings 4 are provided in parallel, wherein the return wire 4.2 of one primary winding 4 is guided around one side of the secondary winding 5, and the return wire 4.2 of the other primary winding 4 is guided around the opposite side of the secondary winding 5.

[0055] Figure 10 This is a schematic detail view of the current converter 1, showing the interface between the upper flange 9 and the cover flange 18, with an insulating ring 24 arranged between them. Both the upper flange 9 and the cover flange 18 include corresponding circumferential recesses 25 and 26, in which corresponding O-rings 27 and 28 are arranged to seal against the insulating ring 24, preventing oil leakage within the cavity of the current converter 1.

[0056] A bushing 30 made of electrically insulating material is arranged in each cover flange hole 20, and a screw 22 is guided through the bushing 30, thus keeping the head oil tank 2 and the head oil tank cover 3 electrically insulated from each other.

[0057] The insulating ring 24 and / or bushing 30 may be made of, for example, PTFE, polyoxymethylene or HDPE.

[0058] When the current converter 1 makes electrical contact with the first primary terminal 12 and the second primary terminal 19, current flows from the first primary terminal 12 through the head tank 2, connection point 13, primary winding 4, cover connection point 23, head tank cover 3, and to the second primary terminal 19, and / or current flows from the second primary terminal through the head tank cover, cover connection point, primary winding, connection point, head tank, and to the first primary terminal. This current can be indirectly measured by measuring the typically much weaker current induced in the secondary winding 5.

[0059] The solution according to the invention allows the primary bar 4.1 through the secondary winding 5 to be arranged with more than four turns, for example, eight turns.

[0060] With the same performance, it is possible to have one to ten or more turns (e.g., 100 or more turns) with different current values.

[0061] The current converter according to the present invention can be more streamlined compared to conventional current converters.

[0062] In stark contrast to conventional current converters, the primary winding 4 is electrically connected to the head oil tank 2 and the head oil tank cover 3. This prevents inconvenient leakage of oil held within the cavity into the environment and also prevents air leakage from the environment into the current converter 1. Furthermore, in Figure 9 In the configuration shown with two primary windings 4 connected in parallel, only four screws 16 and 22 are needed to assemble the primary circuit, thus reducing human error, assembly time, and the purchase of a large amount of materials.

[0063] Compared to conventional current converters with similar performance, the economic savings could be as high as 20%.

[0064] The main advantages of the solution according to the present invention can be:

[0065] - Improve flexibility in primary circuit design

[0066] - There are no restrictions on the number of turns in the primary winding.

[0067] -Potentially used in wound current converters that support extremely small currents.

[0068] - Lower cost

[0069] - There is no contact between the external components and the oil held within the current converter.

[0070] -A more streamlined design

[0071] - Reduces the probability of human error during assembly.

[0072] - Faster assembly,

[0073] - Lighter and smaller, making it easier to pack and ship.

[0074] - No special tools are required for assembly, and

[0075] - Applicable standard impregnation treatment.

[0076] Although the invention has been shown and described in detail with reference to preferred embodiments, those skilled in the art will understand that modifications (additions and / or removals) can be made to the apparatus, methods and / or systems described herein, as well as various components of the embodiments, without departing from the full scope and spirit of the invention, which includes such modifications and any and all equivalents thereof.

Claims

1. A current converter comprising a head tank (2) and a head tank cover (3), both the head tank and the head tank cover comprising a conductive material, at least one primary winding (4) for conducting a current to be measured, the primary winding (4) comprising at least one primary bar (4.1), and a secondary winding (5) wound around the at least one primary bar (4.1), the primary winding (4) and the secondary winding (5) being arranged within cavities defined within the head tank (2) and the head tank cover (3), the head tank cover (3) being disposed on the head tank (2), wherein, The upper flange (9) of the head oil tank (2) is configured to abut against the cover flange (18) of the head oil tank cover (3) for a fluid tight seal. The head oil tank (2) and the head oil tank cover (3) respectively include primary terminals (12, 19) for electrical contact with the primary winding (4). One or more connection points (13, 23) are respectively provided in the head oil tank (2) and the head oil tank cover (3) to electrically connect the corresponding ends of the primary winding (4) to the head oil tank (2) and the head oil tank cover (3). An electrical insulating ring (24) is arranged between the cover flange (18) and the upper flange (9).

2. The current converter (1) according to claim 1, wherein, The primary winding (4) includes a plurality of primary bars (4.1) extending in parallel and a plurality of loop wires (4.2) connecting one corresponding primary bar (4.1) to another corresponding primary bar, wherein the loop wires (4.2) are wound around the secondary winding (5).

3. The current converter (1) according to claim 2, wherein, The circuit wire (4.2) is positioned within a cavity defined within the head tank (2) and the head tank cover (3).

4. The current converter (1) according to any one of claims 1 to 3, wherein, The primary winding (4) comprises paper-insulated copper wire.

5. The current converter (1) according to claim 2 or 3, wherein, The head tank (2) includes a platform (10) that provides a widened space (11) below the upper flange (9) to receive the loop conductor (4.2) wound around the secondary winding (5).

6. The current converter (1) according to any one of claims 1 to 3, wherein, The primary terminals (12, 19) include a first primary terminal (12) and a second primary terminal (19), wherein the first primary terminal (12) extends substantially radially from the head tank (2) relative to the longitudinal axis (A), and / or wherein the second primary terminal (19) extends substantially radially from the head tank cover (3) relative to the longitudinal axis (A).

7. The current converter (1) according to any one of claims 1 to 3, wherein, The connection points (13, 23) include a thickened portion, wherein the connection points (13, 23) are provided with one or more threaded holes to allow the end of the primary winding (4) or the cable lugs attached to the end of the primary winding to be fastened by means of corresponding screws (16, 29).

8. The current converter (1) according to any one of claims 1 to 3, wherein, One or more operating protrusions (14) extend radially from the head oil tank (2).

9. The current converter (1) according to claim 8, wherein, The operating protrusion (14) includes a corresponding operating hole (15) for connecting a D-shaped shackle.

10. The current converter (1) according to claim 6, wherein, The second primary terminal (19) is bent so that when the head tank cover (3) is arranged on the head tank (2), the second primary terminal is positioned at the same height as the first primary terminal (12).

11. The current converter (1) according to claim 6, wherein, The head tank cover (3) is mounted on the head tank (2) such that the first primary terminal (12) and the second primary terminal (19) extend in opposite directions.

12. The current converter (1) according to any one of claims 1 to 3, wherein, The cover flange (18) includes a plurality of cover flange holes (20) and the upper flange (9) includes a plurality of corresponding upper flange holes (21), the cover flange holes and the upper flange holes being configured to allow the head tank cover (3) to be fastened to the head tank (2) by screws (22), wherein the upper flange holes (21) or the cover flange holes (20) are threaded and / or configured as blind holes, wherein a corresponding electrically insulating bushing (30) is arranged in each of the cover flange holes (20) and / or each of the upper flange holes (21), and the screw (22) is guided through the electrically insulating bushing (30).

13. The current converter (1) according to claim 2 or 3, wherein, The primary winding (4) is provided with two or more electrically parallel primary windings, wherein the return conductor (4.2) of one of the primary windings (4) is guided around one side of the secondary winding (5), and the return conductor (4.2) of the other primary winding (4) is guided around the opposite side of the secondary winding (5).

14. The current converter (1) according to any one of claims 1 to 3, wherein, The upper flange (9) and the cover flange (18) include corresponding circumferential recesses (25, 26), in which corresponding O-rings are arranged to seal the upper flange (9) and the cover flange (18) against the electrical insulating ring (24).

15. The current converter (1) according to claim 12, wherein, The electrically insulating ring (24) and / or the electrically insulating bushing (30) are made of PTFE, polyoxymethylene or HDPE.

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