CN222867423U

CN222867423U - Zero sequence transformer

Info

Publication number: CN222867423U
Application number: CN202421853339.1U
Authority: CN
Inventors: 杨俊彪; 文钢亮; 郭兴华
Original assignee: FOSHAN SUNCUPID ELECTRONIC FACTORY Ltd
Current assignee: FOSHAN SUNCUPID ELECTRONIC FACTORY Ltd
Priority date: 2024-08-01
Filing date: 2024-08-01
Publication date: 2025-05-13
Anticipated expiration: 2034-08-01

Abstract

The utility model relates to the technical field of current detection devices, and in particular to a zero-sequence mutual inductor, which includes a shell, a metal core fixed on the shell, a core winding wound on the metal core, a cross-line winding fixed at one end on the metal core, two first pins fixed at one end of the shell, and two second pins fixed at 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. The metal core, the core winding, the cross-line winding, the two first pins and the two second pins are all fixedly arranged on the shell, the two winding heads of the core winding are respectively fixed on the corresponding first pin, and the two winding heads of the cross-line winding are respectively fixed on the corresponding second pin. The production automation is simpler and more efficient, the process is more simplified, and the efficiency of installation and disassembly is improved.

Description

Zero sequence transformer

Technical Field

The utility model relates to the technical field of current detection devices, in particular to a zero sequence transformer.

Background

The zero sequence current transformer is a single turn through type current transformer and is generally used for power protection equipment. The zero sequence current transformer is matched with a relay protection device or a signal for use when the power system generates zero sequence grounding current, so that protection or monitoring is realized. No current is induced in the secondary winding of the transformer, when faults such as single-phase grounding and the like occur in the primary circuit, unbalanced current (namely zero sequence current) is generated in the primary circuit, and tiny current is induced in the secondary winding to enable the relay to act, so that signals occur. The existing zero sequence transformer has simple and single structural modeling, only outputs magnetic core windings, and the overline windings are realized by singly crossing the transformer by using wires, so that the integrated assembly processing in the production process is not facilitated, and the production efficiency is lower.

Disclosure of utility model

In order to solve the technical defects in the background art, the utility model aims to provide a zero sequence transformer.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

The zero sequence transformer comprises a shell, a metal magnetic core fixed on the shell, a magnetic core winding wound on the metal magnetic core, a cross-wire winding, two first pins fixed on one end of the shell and two second pins fixed on the other end of the shell, wherein two winding heads of the magnetic core winding are respectively and fixedly connected with one corresponding first pin, and two winding heads of the cross-wire winding are respectively and fixedly connected with one corresponding second pin.

Through adopting above-mentioned technical scheme, metal magnetic core, magnetic core winding, overline winding, two first pins and two second pins are all fixed to be set up on the shell, and two wire winding heads of magnetic core winding are fixed in respectively on the first pin that corresponds, and two wire winding heads of overline winding are all fixed in respectively on the second pin that corresponds, and production automation is simpler and more convenient, more efficient, and the process is simplified more, has improved the efficiency of installation dismantlement.

Further, two inner holes are formed in the periphery of the metal magnetic core, and the overline winding comprises two wires. Each wire corresponds to one inner hole and is fixedly connected in the inner hole. The winding head of the wire is provided with an annular sleeve head, the sleeve head is sleeved on the corresponding second stitch, the assembly efficiency is improved, and the connection is more stable.

Further, the shell comprises a shell body and a plurality of supporting blocks, wherein a mounting groove with one side opened is formed in the shell body, a plurality of supporting blocks are arranged at intervals at the bottom of the mounting groove, the end parts of the metal magnetic cores are placed on the supporting blocks, a filling space is provided for the metal magnetic cores and the bottom of the mounting groove, and therefore assembly and production efficiency are improved. The mounting groove with the periphery side of metal magnetic core is filled with the epoxy layer, the epoxy layer is used for fixed the casing, metal magnetic core, magnetic core winding, cross line winding.

Further, the metal magnetic core sets up in annular structure, the mounting groove corresponds to set up to annular structure, the groove width of mounting groove is greater than the width of metal magnetic core provides more filling space to improve the efficiency of filling, make the metal magnetic core with the mounting groove is connected inseparabler.

Further, a communication groove communicated with the mounting groove is further formed in the shell. And mounting holes which are parallel to the central axis direction of the metal magnetic core and penetrate through the connecting grooves are formed in the positions corresponding to the two first pins and the two second pins. One end of each first stitch and one end of each second stitch penetrate through the corresponding mounting hole to be located in the corresponding communication groove, and the epoxy resin layer is poured into the corresponding communication groove and the corresponding mounting groove. The zero sequence transformer assembly integration is realized, the through rate of production assembly is improved, and the stability of the quality of the assembly process is improved.

Further, the side of shell is provided with two open recesses that set up, the recess is used for the card to establish copper movable contact, realizes the integrated assembly processing of production process, has improved the efficiency of production.

Further, the two first pins and the two first pins are arranged on the same side of the shell, the two grooves are arranged on the other side of the shell, the structure is compact, and the cost is saved.

Furthermore, the shell deviates from the one side of installing the metal magnetic core and is provided with a reference column in a protruding mode at least, so that the installation accuracy and the assembly efficiency are improved.

In summary, the beneficial effects of the utility model are as follows:

according to the utility model, 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, the two winding heads of the magnetic core winding are respectively fixed on the corresponding first pins, the two winding heads of the overline winding are respectively fixed on the corresponding second pins, the production automation is simpler and more convenient and more efficient, the working procedure is simpler, and the mounting and dismounting efficiency is improved.

Drawings

Figure 1 is a schematic diagram of an embodiment of the zero sequence transformer of the present utility model.

Figure 2 is a schematic diagram of an embodiment of a metallic core winding of the zero sequence transformer of the present utility model.

Figure 3 is a schematic diagram of an embodiment of the housing of the zero sequence transformer of the present utility model.

Figure 4 is a schematic diagram of the structure of another view of an embodiment of the housing of the zero sequence transformer of the present utility model.

Reference numerals in the drawings illustrate:

1. The zero sequence transformer comprises a zero sequence transformer body, a shell 21, a shell body, a 22, a supporting block, a 23, a mounting groove, a 24, a communicating groove, a 25, a groove, a 26, a positioning column, a 3, a metal magnetic core, a 4, a magnetic core winding, a 5, a line crossing winding, a 6, a first stitch, a 7 and a second stitch.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which are derived by a person skilled in the art based on the embodiments of the utility model, fall within the scope of protection of the utility model.

It will be appreciated by those skilled in the art that in the present disclosure, the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc. refer to an orientation or positional relationship based on that shown in the drawings, which is merely for convenience of description and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore the above terms should not be construed as limiting the present utility model.

In the description of the present utility model, if there is a word description such as "a plurality" or the like, the meaning of the plurality is one or more, the meaning of the plurality is two or more, and greater than, less than, exceeding, etc. are understood to exclude the present number, and above, below, within, etc. are understood to include the present number. The description of first, second, and third is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of technical features indicated.

Embodiments of the present utility model are described in further detail below with reference to FIGS. 1-4.

As shown in fig. 1, the zero sequence transformer 1 comprises a shell 2, a metal magnetic core 3 fixed on the shell 2, a magnetic core winding 4 wound on the metal magnetic core 3, a jumper 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 and fixedly connected to a corresponding first pin 6, and the two winding heads of the overline winding 5 are respectively and fixedly connected to a corresponding second pin 7.

The metal magnetic core 3, the magnetic core winding 4, the overline winding 5, the two first pins 6 and the two second pins 7 are all fixedly arranged on the shell 2, the two winding heads of the magnetic core winding 4 are respectively fixed on the corresponding first pins 6, the two winding heads of the overline winding 5 are respectively fixed on the corresponding second pins 7, the production automation is simpler, more convenient and more efficient, the working procedure is simplified, and the mounting and dismounting efficiency is improved.

Specifically, referring to fig. 1 and 2, two inner holes are disposed on the circumferential side of the metal magnetic core 3, and the overwire winding 5 includes two wires. Each wire corresponds to one inner hole and is fixedly connected in the inner hole. The winding head of the wire is provided with an annular sleeve head which is sleeved on the corresponding second pin 7, so that the assembly efficiency is improved, and the connection is more stable. After the sleeve head is placed on the second pin 7, the sleeve head is fixed through soldering, so that the stability of the connecting structure is further improved.

In this embodiment, referring to fig. 1, 3 and 4, the housing 2 includes a casing 21 and a plurality of support blocks 22, a mounting groove 23 with one side open is provided in the casing 21, and a plurality of support blocks 22 are provided at intervals at the bottom of the mounting groove 23. The end of the metal magnetic core 3 is placed on the supporting block 22, so that the lower surface of the metal magnetic core 3 is separated from the bottom of the mounting groove 23, a filled space is provided for the bottom of the metal magnetic core 3 and the bottom of the mounting groove 23, and the assembly and production efficiency are improved. The mounting groove 23 and the outer peripheral side of the metal core 3 are filled with an epoxy resin layer for fixing the case 21, the metal core 3, the core winding 4, and the flying lead winding 5.

The metal magnetic core 3 sets up in annular structure, and mounting groove 23 corresponds to set up to annular structure, and the groove width of mounting groove 23 is greater than the width of metal magnetic core 3, provides more filling space to improve the efficiency of filling, make the metal magnetic core 3 more inseparable with the mounting groove 23 connection.

The magnetic core winding 4 is an enameled wire wound on the metal magnetic core 3, the enameled wire is wound on the annular metal magnetic core 3 for 1-3 circles, and then the winding heads at two ends of the enameled wire are respectively and fixedly connected with the corresponding first pins 6 in a tin-dipping mode.

The housing 21 is further provided with a communication groove 24 communicating with the mounting groove 23. And mounting holes which are communicated in the direction parallel to the central axis of the metal magnetic core 3 are arranged in the communication groove 24 and correspond to the positions of the two first pins 6 and the two second pins 7. One ends of the first pin 6 and the second pin 7 penetrate through corresponding mounting holes and are located in the communication groove 24, and epoxy resin layers are filled in the communication groove 24 and the mounting groove 23. The zero sequence transformer 1 is assembled and integrated, the through rate of production and assembly is improved, and the stability of the quality of an assembly process is improved.

The side of shell 2 is provided with two recess 25 that open and set up, be used for the card to establish copper movable contact in the recess 25, realize the integrated assembly processing of production process, improved the efficiency of production. Wherein the copper movable contact is not shown in the figure.

The two first pins 6 and the two second pins are arranged on the same side of the shell 2, the two grooves 25 are arranged on the other side of the shell 2, the structure is compact, and the cost is saved.

At least one positioning column 26 is arranged on one side of the shell 2, which is away from the metal magnetic core 3, in a protruding mode, and therefore the installation accuracy and the assembly efficiency are improved.

The shell 2 is made of flame-retardant fireproof engineering plastics by compression molding, and has the characteristics of high temperature resistance, high strength and flame retardance. The first pins 6 and the second pins 7 are fixed on the shell 21, and the shell 21 is provided with two grooves 25, so that the copper movable contact piece can be assembled into the grooves 25, the production automation is simpler, more convenient and more efficient, and the practicability and the innovation are increased.

The metal magnetic core 3 adopts a spraying or plastic shell-closing mode to strengthen the body, so that the metal magnetic core is prevented from being damaged due to external stress, and electric breakdown and short circuit between the magnetic core and the enameled wire can be effectively prevented, thereby improving the electric performance and stability of the whole iron core. The core winding 4 is an enameled wire wound on the metal core 3, and is wound on the annular metal core 3 in a multi-turn winding manner. During assembly, the winding heads of the core winding 4 are fixed on the first pins 6 and are soldered. The overline winding 5 passes through the inner hole of the metal magnetic core 3 by a lead wire, the winding head is fixed on the second stitch 7 and is subjected to tin immersion, and the transformer overline procedure when the leakage protector is assembled is omitted, so that the assembly integration of the zero sequence transformer 1 is realized. The metal magnetic core 3, the magnetic core winding 4 and the overline winding 5 are integrally placed in the shell 21, and after being pressed to the bottom, the shell 21 is filled with epoxy resin in a potting mode (the glue filling depth is reserved in the shell 21), so that the assembly is completed.

The embodiments of the present application are all preferred embodiments of the present application, and are not intended to limit the scope of the present application, wherein like reference numerals are used to refer to like elements throughout. Therefore, all equivalent changes according to the structure, shape and principle of the present application should be covered in the protection scope of the present application.

Claims

1. The zero sequence transformer (1) comprises a shell (2), a metal magnetic core (3) fixed on the shell (2) and a magnetic core winding (4) wound on the metal magnetic core (3), and is characterized by further comprising a jumper 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), wherein two winding heads of the magnetic core winding (4) are respectively and fixedly connected with one corresponding first pin (6), and two winding heads of the jumper winding (5) are respectively and fixedly connected with one corresponding second pin (7).

2. The zero sequence transformer (1) according to claim 1, characterized in that two inner holes are formed in the periphery of the metal magnetic core (3), the overline winding (5) comprises two wires, each wire corresponds to one inner hole and is fixedly connected in the inner hole, an annular sleeve head is arranged at a winding head of the wire, and the sleeve head 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 supporting blocks (22), wherein a mounting groove (23) with one side open is formed in the shell (21), a plurality of supporting blocks (22) are arranged at intervals at the bottom of the mounting groove (23), the end part of the metal magnetic core (3) is placed on the supporting blocks (22), and epoxy resin layers are filled on the outer peripheral sides of the mounting groove (23) and the metal magnetic core (3) and used for fixing the shell (21), the metal magnetic core (3), the magnetic core windings (4) and the overline windings (5).

4. A 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 larger than the width of the metal magnetic core (3).

5. The zero sequence transformer (1) according to claim 4, wherein the shell (21) is further provided with a communication groove (24) communicated with the mounting groove (23), the positions of the two corresponding first pins (6) and the two corresponding second pins (7) in the communication groove (24) are respectively provided with a mounting hole communicated in parallel with the central axis direction of the metal magnetic core (3), one end of each of the first pins (6) and the second pins (7) penetrates through the corresponding mounting hole to be located in the communication groove (24), and the epoxy resin layer is poured into each of the communication groove (24) and the mounting groove (23).

6. The zero sequence transformer (1) according to claim 1, characterized in that the side of the housing (2) is provided with two open-arranged grooves (25), which grooves (25) are used for clamping copper moving contacts.

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

8. Zero sequence transformer (1) according to claim 1, characterized in that at least one positioning post (26) protrudes from the side of the housing (2) facing away from the metal core (3).