CN219321151U

CN219321151U - Divide turn and equal magnetic current transformer

Info

Publication number: CN219321151U
Application number: CN202223558464.3U
Authority: CN
Inventors: 戴建尧; 刘陈文; 孙丽敏; 孙政
Original assignee: Zhejiang Luoke Electric Power Technology Co ltd
Current assignee: Zhejiang Luoke Electric Power Technology Co ltd
Priority date: 2022-12-27
Filing date: 2022-12-27
Publication date: 2023-07-07
Anticipated expiration: 2032-12-27

Abstract

The utility model relates to a turn-dividing and magnetic-equalizing current transformer which comprises a shell, a coil assembly and a secondary wiring terminal arranged on the shell, wherein the shell comprises a bottom shell and an upper shell arranged on the bottom shell, an annular accommodating cavity for accommodating the coil assembly is formed between the bottom shell and the upper shell, the coil assembly comprises an annular iron core arranged in the annular accommodating cavity, a secondary coil wound on the annular iron core, a main insulating layer wrapped on the secondary coil, a primary coil wound on the main insulating layer, a P1 conducting bar arranged on the bottom shell and a P2 conducting bar arranged on the upper shell, one end of each primary wire is welded on the P1 conducting bar, and the other end of each primary wire is welded on the P2 conducting bar. The utility model has the advantages of simple structure, stable and reliable performance, convenient assembly, convenient wiring and high precision.

Description

Divide turn and equal magnetic current transformer

Technical Field

The utility model relates to a current transformer, in particular to a turn-dividing and magnetic-homogenizing current transformer.

Background

The current transformer is an instrument for converting primary side large current into secondary side small current according to an electromagnetic induction principle to measure. The through-wall type current transformer is equipment for measuring current, electric energy or relay protection in a switch cabinet of a power system. The existing primary multi-turn current transformer has the defects that primary wires can only be distributed on the part of a ring-shaped iron core due to too few primary turns, excitation current is easy to be distributed in an excessively concentrated mode, the magnetic field of the iron core is unevenly distributed, and the error characteristic of the transformer is seriously affected by large magnetic leakage.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art and provide the turn-dividing and magnetic-homogenizing current transformer which has the advantages of simple structure, stable and reliable performance, convenience in assembly, convenience in wiring and high precision.

In order to achieve the above purpose, the utility model adopts a turn-by-turn equal-magnetic current transformer, which comprises a shell, a coil assembly arranged in the shell and a secondary wiring terminal arranged on the shell, wherein the shell comprises a bottom shell and an upper shell arranged on the bottom shell, an annular accommodating cavity for accommodating the coil assembly is formed between the bottom shell and the upper shell, the coil assembly comprises an annular iron core arranged in the annular accommodating cavity, a secondary coil wound on the annular iron core, a main insulating layer wrapped on the secondary coil, a primary coil wound on the main insulating layer, a P1 conductive row arranged on the bottom shell and a P2 conductive row arranged on the upper shell, the primary coil comprises a plurality of primary wires wound in an annular array, one ends of the primary wires are respectively welded on the P1 conductive row, and the other ends of the primary wires are respectively welded on the P2 conductive row.

The beneficial effects of the structure are as follows: the primary coil adopts a plurality of primary wires which are uniformly wound on the main insulating layer, two ends of each primary wire are respectively connected to the P1 conductive bar and the P2 conductive bar, and two ends of each primary wire are uniformly distributed on the secondary coil, and the magnetic field of the iron core is uniformly distributed due to the uniform distribution of the electric field, so that the magnetic leakage between the primary coil and the secondary coil is small, and the current transformer has higher precision. The coil assembly is arranged in the annular accommodating cavity of the shell, so that the coil assembly and the shell are convenient to assemble, and the assembly is more convenient. Therefore, the current transformer has the advantages of simple structure, stable and reliable performance and high precision.

Particularly, a first sleeve part matched with the coil assembly is arranged on the bottom shell, a second sleeve part matched with the first sleeve part is arranged on the upper shell, the first sleeve part and the second sleeve part are assembled and are provided with supporting sleeves, and the coil assembly is sleeved on the supporting sleeves. The first sleeve part and the second sleeve part which are matched with the coil assembly are respectively arranged in the bottom shell and the upper shell, so that the assembly of the bottom shell, the upper shell and the coil assembly is convenient, and the assembly is more convenient.

In particular, the secondary wiring terminal is connected with a secondary lead of the secondary coil, and a protective cover covering the secondary wiring terminal is arranged on the shell. The protective cover which covers the secondary wiring terminal is arranged on the shell, so that the protective performance of the current transformer is improved.

Particularly, the P1 conductive bar and the P2 conductive bar are respectively provided with a wiring part extending outside the shell, wiring holes are formed in the wiring parts, and wiring bolts are arranged in the wiring holes. And wiring holes are formed in the P1 conducting bar and the P2 conducting bar, so that wiring of the current transformer is facilitated, and wiring is more convenient.

Drawings

Fig. 1 is a front view of an internal structure of an embodiment of the present utility model.

Fig. 2 is a right side view of the internal structure of the embodiment of the present utility model.

Fig. 3 is a front view of an embodiment of the present utility model.

Fig. 4 is a cross-sectional view A-A of fig. 3.

Detailed Description

As shown in fig. 1 to 4, an embodiment of the present utility model is a split-turn current transformer, which includes a housing 10, a coil assembly 20 disposed in the housing 10, and a secondary connection terminal 30 disposed on the housing 10, wherein the housing 10 includes a bottom shell 11, and an upper shell 12 disposed on the bottom shell 11, an annular accommodating cavity 100 for accommodating the coil assembly 20 is formed between the bottom shell 11 and the upper shell 12, the coil assembly 20 includes an annular iron core 21 disposed in the annular accommodating cavity 100, a secondary coil 22 wound on the annular iron core 21, a primary coil 24 wrapped on the secondary coil 22, a P1 conductive bar 25 disposed on the bottom shell 11, and a P2 conductive bar 26 disposed on the upper shell 12, one end of the primary wire 241 is welded on the P1 conductive bar 25, and the other end of the primary wire 241 is welded on the P2 conductive bar 26. The bottom shell 11 is provided with a first sleeve part 111 matched with the coil assembly 20, the upper shell 12 is provided with a second sleeve part 121 matched with the first sleeve part 111, the first sleeve part 111 and the second sleeve part 121 are assembled and are provided with a support sleeve 101, and the coil assembly 20 is sleeved on the support sleeve 101. The first sleeve part and the second sleeve part which are matched with the coil assembly are respectively arranged in the bottom shell and the upper shell, so that the assembly of the bottom shell, the upper shell and the coil assembly is convenient, and the assembly is more convenient.

As shown in fig. 4, the secondary terminal 30 is connected to the secondary lead 221 of the secondary coil 22, and the housing 10 is provided with a protective cover 13 covering the secondary terminal 30. The protective cover which covers the secondary wiring terminal is arranged on the shell, so that the protective performance of the current transformer is improved.

As shown in fig. 1, the P1 conductive bars 25 and P2 conductive bars 26 respectively have a wiring portion 200 extending outside the housing 10, a wiring hole 201 is provided in the wiring portion 200, and a wiring bolt 203 is provided in the wiring hole 201. And wiring holes are formed in the P1 conducting bar and the P2 conducting bar, so that wiring of the current transformer is facilitated, and wiring is more convenient. The primary coil adopts a plurality of primary wires which are uniformly wound on the main insulating layer, two ends of each primary wire are respectively connected to the P1 conductive bar and the P2 conductive bar, and two ends of each primary wire are uniformly distributed on the secondary coil, and the magnetic field of the iron core is uniformly distributed due to the uniform distribution of the electric field, so that the magnetic leakage between the primary coil and the secondary coil is small, and the current transformer has higher precision. The coil assembly is arranged in the annular accommodating cavity of the shell, so that the coil assembly and the shell are convenient to assemble, and the assembly is more convenient. Therefore, the current transformer has the advantages of simple structure, stable and reliable performance and high precision.

Claims

1. The utility model provides a divide circle all magnetism current transformer, includes casing, sets up coil assembly in the casing, sets up the secondary binding post on the casing, its characterized in that: the shell include the drain pan, set up the epitheca on the drain pan, drain pan and epitheca between be formed with the annular holding chamber that is used for placing the coil assembly, the coil assembly including set up annular core, the secondary winding of coiling on annular core, wrap up the main insulating layer on the secondary winding, the primary winding of coiling on the main insulating layer, set up P1 conducting strip on the drain pan, set up the P2 conducting strip on the epitheca, the primary winding including being the many primary wires on the main insulating layer of annular array coiling, many primary wire one end weld respectively on P1 conducting strip, many primary wire other ends weld respectively on P2 conducting strip.

2. The split turn current transformer of claim 1, wherein: the coil assembly is characterized in that a first sleeve part matched with the coil assembly is arranged on the bottom shell, a second sleeve part matched with the first sleeve part is arranged on the upper shell, the first sleeve part and the second sleeve part are assembled and are provided with supporting sleeves, and the coil assembly is sleeved on the supporting sleeves.

3. The turn-by-turn current-balancing transformer according to claim 1 or 2, characterized in that: the secondary wiring terminal is connected with a secondary lead of the secondary coil, and a protective cover covering the secondary wiring terminal is arranged on the shell.

4. The turn-by-turn current-balancing transformer according to claim 1 or 2, characterized in that: the P1 conducting bar and the P2 conducting bar are respectively provided with a wiring part extending outside the shell, wiring holes are formed in the wiring parts, and wiring bolts are arranged in the wiring holes.