Zero sequence mutual inductor

Abstract

The utility model relates to the technical field of current detection devices, in particular to a zero sequence mutual inductor. The metal magnetic core is fixed on the shell, the magnetic core winding is wound on the metal magnetic core, one end of the overline winding is fixed on the metal magnetic core, the two first pins are fixed at one end of the shell, and the two second pins are fixed at the other end of the shell. The two winding heads of the magnetic core winding are fixedly connected to the corresponding first pins respectively, and the two winding heads of the overline winding are fixedly connected to the corresponding second pins respectively. The metal magnetic core, the magnetic core winding, the overline winding, the two first pins and the two second pins are all fixedly arranged on the shell, two winding heads of the magnetic core winding are fixed to the corresponding first pins respectively, and two winding heads of the overline winding are fixed to the corresponding second pins respectively, so that production automation is simpler, more convenient and more efficient, the process is more simplified, and production efficiency is improved. And the mounting and dismounting efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of current detection devices, in particular to a zero-sequence mutual inductor. Background Art

[0002] The zero-sequence current transformer is a single-turn through-type current transformer, which is generally used in power protection equipment. When the power system generates zero-sequence grounding current, the zero-sequence current transformer is used in conjunction with a relay protection device or signal to achieve protection or monitoring. No current is induced in the secondary winding of the transformer. When a single-phase grounding fault occurs in the primary line, an unbalanced current (i.e., zero-sequence current) is generated in the primary circuit, and a small current is induced in the secondary winding to activate the relay and generate a signal. The existing zero-sequence transformer has a simple and single structure, with only a magnetic core winding output, and the cross-line winding is realized by a separate wire crossing the transformer, which is not conducive to the integrated assembly and processing of the production process, and has low production efficiency. Utility Model Content

[0003] In order to solve the technical defects mentioned in the above background technology, the purpose of the utility model is to provide a zero-sequence mutual inductor.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A zero-sequence mutual inductor comprises a shell, a metal core fixed on the shell, and a core winding wound on the metal core. It also comprises a cross-line winding with one end fixed on the metal core, two first pins fixed on one end of the shell, and two second pins fixed on the other end of the shell; the two winding heads of the core winding are respectively fixedly connected to a corresponding first pin, and the two winding heads of the cross-line winding are respectively fixedly connected to a corresponding second pin.

[0006] By adopting the above technical solution, the metal magnetic core, the magnetic core winding, the cross-line winding, the two first pins and the two second pins are all fixed on the outer shell, the two winding heads of the magnetic core winding are respectively fixed on the corresponding first pins, and the two winding heads of the cross-line winding are respectively fixed on the corresponding second pins. The production automation is easier and more efficient, the process is simplified, and the efficiency of installation and disassembly is improved.

[0007] Furthermore, two inner holes are arranged on the circumference of the metal magnetic core, and the cross-wire winding includes two wires. Each of the wires corresponds to one of the inner holes and is fixedly connected to the inner hole. A circular sleeve is arranged at the winding head of the wire, and the sleeve is sleeved on the corresponding second pin, so as to improve the assembly efficiency and make the connection more stable.

[0008] Furthermore, the shell includes a shell and a plurality of support blocks, the shell is provided with a mounting groove with one side open, the bottom of the mounting groove is provided with a plurality of support blocks at intervals, the end of the metal core is placed on the support block, and a filling space is provided for the metal core and the bottom of the mounting groove, thereby improving assembly and production efficiency. The mounting groove and the outer peripheral side of the metal core are filled with an epoxy resin layer, and the epoxy resin layer is used to fix the shell, the metal core, the core winding, and the cross-line winding.

[0009] Furthermore, the metal core is arranged in an annular structure, and the mounting groove is correspondingly arranged as an annular structure. The groove width of the mounting groove is greater than the width of the metal core, providing more filling space, thereby improving the filling efficiency and making the metal core more tightly connected to the mounting groove.

[0010] Furthermore, the housing is also provided with a connecting groove connected to the mounting groove. The connecting groove is provided with mounting holes that pass through in parallel to the central axis direction of the metal core at the positions corresponding to the two first pins and the two second pins. One end of the first pin and the second pin are both inserted into the corresponding mounting holes in the connecting groove, and the connecting groove and the mounting groove are both filled with the epoxy resin layer. The integrated assembly of the zero-sequence mutual inductor is realized, which improves the pass rate of production assembly and the stability of assembly process quality.

[0011] Furthermore, two open grooves are provided on the side of the housing, and the grooves are used to clamp the copper moving contact piece, so as to realize integrated assembly and processing in the production process and improve the production efficiency.

[0012] Furthermore, the two first pins and the two second pins are arranged on the same side of the shell, and the two grooves are arranged on the other side of the shell, which has a compact structure and saves costs.

[0013] Furthermore, at least one positioning column is protrudingly provided on a side of the shell away from where the metal magnetic core is installed, thereby improving installation accuracy and assembly efficiency.

[0014] In summary, the beneficial effects of the utility model are:

[0015] The utility model fixes the metal magnetic core, the magnetic core winding, the cross-line winding, the two first pins and the two second pins on the shell, and the two winding heads of the magnetic core winding are respectively fixed on the corresponding first pins, and the two winding heads of the cross-line winding are respectively fixed on the corresponding second pins. The production automation is simpler and more efficient, the process is simplified, and the efficiency of installation and disassembly is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of an embodiment of the zero-sequence mutual inductor of the utility model.

[0017] Figure 2 The utility model is a structural schematic diagram of an embodiment of the metal core winding of the zero-sequence mutual inductor.

[0018] Figure 3 It is a structural schematic diagram of an embodiment of a housing of a zero-sequence transformer of the utility model.

[0019] Figure 4 It is a structural schematic diagram of another perspective of an embodiment of the housing of the zero-sequence transformer of the utility model.

[0020] Description of reference numerals in the figures:

[0021] 1. Zero-sequence transformer; 2. Shell; 21. Shell; 22. Support block; 23. Mounting slot; 24. Connecting slot; 25. Groove; 26. Positioning column; 3. Metal core; 4. Core winding; 5. Cross-line winding; 6. First pin; 7. Second pin. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the utility model.

[0023] Those skilled in the art should understand that, in the disclosure of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0024] In the description of the utility model, if there is a word description such as "several", it means one or more, and the meaning of "more" is two or more. Greater than, less than, and more than are understood to exclude the number itself, and above, below, and within are understood to include the number itself. If there is a description of the first, second, and third, it is only used to distinguish the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0025] The following is combined with Figure 1-4 , the embodiments of the utility model are further described in detail.

[0026] A zero-sequence transformer 1, such as Figure 1 As shown, it includes a housing 2, a metal core 3 fixed on the housing 2, a core winding 4 wound on the metal core 3, a cross-line winding 5 with one end fixed on the metal core 3, two first pins 6 fixed on one end of the housing 2, and two second pins 7 fixed on the other end of the housing 2. The two winding heads of the core winding 4 are respectively fixedly connected to a corresponding first pin 6, and the two winding heads of the cross-line winding 5 are respectively fixedly connected to a corresponding second pin 7.

[0027] The metal magnetic core 3, the magnetic core winding 4, the cross-line winding 5, the two first pins 6 and the two second pins 7 are all fixedly arranged on the outer shell 2. The two winding heads of the magnetic core winding 4 are respectively fixed on the corresponding first pins 6, and the two winding heads of the cross-line winding 5 are respectively fixed on the corresponding second pins 7. The production automation is easier and more efficient, the process is more simplified, and the efficiency of installation and disassembly is improved.

[0028] For details, please refer to Figure 1 , Figure 2 Two inner holes are arranged on the circumferential side of the metal magnetic core 3, and the cross-wire winding 5 includes two wires. Each wire corresponds to an inner hole and is fixedly connected in the inner hole. A circular sleeve is arranged at the winding head of the wire, and the sleeve is sleeved on the corresponding second pin 7 to improve the efficiency of assembly and make the connection more stable. After the sleeve is placed on the second pin 7, it is fixed by soldering to further improve the stability of the connection structure.

[0029] In this embodiment, please refer to Figure 1 , Figure 3 , Figure 4 The housing 2 includes a shell 21 and a plurality of support blocks 22. The interior of the shell 21 is provided with a mounting groove 23 with one side open, and a plurality of support blocks 22 are arranged at intervals at the bottom of the mounting groove 23. The end of the metal core 3 is placed on the support block 22, so that the lower surface of the metal core 3 is separated from the bottom of the mounting groove 23, providing a filling space for the metal core 3 and the bottom of the mounting groove 23, thereby improving assembly and production efficiency. The outer peripheral side of the mounting groove 23 and the metal core 3 is filled with an epoxy resin layer, and the epoxy resin layer is used to fix the shell 21, the metal core 3, the core winding 4, and the cross-line winding 5.

[0030] The metal core 3 is arranged in an annular structure, and the mounting groove 23 is correspondingly arranged in an annular structure. The groove width of the mounting groove 23 is greater than the width of the metal core 3, providing more filling space, thereby improving the filling efficiency and making the metal core 3 and the mounting groove 23 more tightly connected.

[0031] The magnetic core winding 4 is an enameled wire wound on the metal magnetic core 3. The enameled wire is wound around the annular metal magnetic core 3 for 1 to 3 turns, and then the winding heads at both ends of the enameled wire are respectively tinned and fixedly connected to the corresponding first pins 6.

[0032] The housing 21 is also provided with a connecting groove 24 connected to the mounting groove 23. The connecting groove 24 is provided with mounting holes that pass through in parallel to the central axis direction of the metal magnetic core 3 at the positions corresponding to the two first pins 6 and the two second pins 7. One end of the first pin 6 and the second pin 7 are both projected through the corresponding mounting holes in the connecting groove 24, and the connecting groove 24 and the mounting groove 23 are both filled with an epoxy resin layer. The zero-sequence mutual inductor 1 is assembled in an integrated manner, which improves the straight-through rate of production assembly and the stability of assembly process quality.

[0033] The side of the housing 2 is provided with two open grooves 25, in which the copper moving contact pieces are clamped, so as to realize the integrated assembly process of the production process and improve the production efficiency. The copper moving contact pieces are not shown in the figure.

[0034] The two first pins 6 and the two second pins are arranged on the same side of the housing 2, and the two grooves 25 are arranged on the other side of the housing 2, which has a compact structure and saves costs.

[0035] At least one positioning post 26 is protrudingly provided on the side of the housing 2 away from the metal magnetic core 3 , so as to improve the installation accuracy and the assembly efficiency.

[0036] The housing 2 is made of flame-retardant and fire-proof engineering plastics by compression molding, and has high temperature resistance, high strength, and flame retardant properties. The first pin 6 and the second pin 7 are fixed to the housing 21, and the housing 21 is provided with two grooves 25, so that the copper moving contact piece can be assembled into the grooves 25, making the production automation simpler and more efficient, and increasing the practicality and innovation.

[0037] The metal core 3 is reinforced by spraying or plastic shelling to avoid damage due to external stress, and can also effectively prevent electrical breakdown and short circuit between the core and the enameled wire, thereby improving the electrical performance and stability of the entire core. The core winding 4 is an enameled wire wound on the metal core 3, and multiple turns are wound on the annular metal core 3 in an enameled wire ring manner. During assembly, the winding head of the core winding 4 is fixed on the first pin 6 and tinned. The cross-line winding 5 passes through the inner hole of the metal core 3 with a lead wire, and the winding head is fixed on the second pin 7 and tinned, eliminating the cross-line process of the mutual inductor when assembling the leakage protector, and realizing the integrated assembly of the zero-sequence mutual inductor 1. The metal core 3, the core winding 4, and the cross-line winding 5 are placed in the shell 21 as a whole, and after being pressed to the bottom, they are potted with epoxy resin (the shell 21 has a reserved potting depth) to complete the assembly.

[0038] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A zero-sequence mutual inductor (1), comprising a housing (2), a metal core (3) fixed to the housing (2), and a core winding (4) wound around the metal core (3), characterized in that: It also comprises a cross-wire winding (5) with one end fixed on the metal magnetic core (3), two first pins (6) fixed on one end of the shell (2), and two second pins (7) fixed on the other end of the shell (2); the two winding heads of the magnetic core winding (4) are respectively fixedly connected to a corresponding first pin (6), and the two winding heads of the cross-wire winding (5) are respectively fixedly connected to a corresponding second pin (7).

2. The zero-sequence transformer (1) according to claim 1, characterized in that: Two inner holes are arranged on the circumferential side of the metal magnetic core (3), and the cross-wire winding (5) includes two wires; each of the wires corresponds to one of the inner holes and is fixedly connected in the inner hole; a circular sleeve is arranged at the winding head of the wire, and the sleeve is sleeved on the corresponding second pin (7).

3. The zero-sequence transformer (1) according to claim 1, characterized in that: The shell (2) comprises a shell (21) and a plurality of support blocks (22); a mounting groove (23) with one side open is arranged inside the shell (21); a plurality of support blocks (22) are arranged at intervals at the bottom of the mounting groove (23); the end of the metal magnetic core (3) is placed on the support block (22); the mounting groove (23) and the outer peripheral side of the metal magnetic core (3) are filled with an epoxy resin layer, and the epoxy resin layer is used to fix the shell (21), the metal magnetic core (3), the magnetic core winding (4), and the cross-line winding (5).

4. The zero-sequence transformer (1) according to claim 3, characterized in that: The metal magnetic core (3) is arranged in an annular structure, the mounting groove (23) is correspondingly arranged in an annular structure, and the groove width of the mounting groove (23) is greater than the width of the metal magnetic core (3).

5. The zero-sequence transformer (1) according to claim 4, characterized in that: The shell (21) is also provided with a connecting groove (24) connected to the mounting groove (23); the connecting groove (24) is provided with mounting holes that pass through in a direction parallel to the central axis of the metal magnetic core (3) at positions corresponding to the two first pins (6) and the two second pins (7); one end of the first pin (6) and the second pin (7) are both inserted into the corresponding mounting holes and located in the connecting groove (24); and the connecting groove (24) and the mounting groove (23) are both filled with the epoxy resin layer.

6. The zero-sequence transformer (1) according to claim 1, characterized in that: Two open grooves (25) are arranged on the side of the housing (2), and the grooves (25) are used to clamp the copper moving contact pieces.

7. The zero-sequence transformer (1) according to claim 6, characterized in that: The two first pins (6) and the two second pins are arranged on the same side of the housing (2), and the two grooves (25) are arranged on the other side of the housing (2).

8. The zero-sequence transformer (1) according to claim 1, characterized in that: At least one positioning column (26) is protrudingly provided on a side of the housing (2) away from where the metal magnetic core (3) is installed.

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