CN221352530U - A current transformer structure and circuit breaker - Google Patents

Abstract

The utility model relates to a current transformer structure and a circuit breaker, and relates to the field of circuit breakers, which comprises a current transformer housing, a conductive bar 1 partially passing through the top of the current transformer housing, and a conductive bar 2 partially passing through the bottom of the current transformer housing. The utility model improves the connecting piece structure of the L pole of the enameled wire, changes it into an upper and lower staggered structure, increases the height of the L pole connecting piece and the electrical gap between the L pole and the N pole enameled wire, and passes the rated withstand impulse voltage 6.2kV test.

Description

A current transformer structure and circuit breaker

Technical Field

The utility model relates to the field of L-pole and N-pole wiring devices, in particular to a current transformer structure and a circuit breaker.

Background technique

With the development of electronic miniature circuit breakers, more and more mutual inductors are used inside miniature circuit breakers. At present, mutual inductors used in miniature circuit breakers usually use soft wires as primary wires to effectively utilize the small space inside the miniature circuit breaker, which results in two disadvantages:

1. The inability to form modular transformer components brings great inconvenience to the assembly automation.

2. It is very inconvenient to wind multiple turns on the primary side of the transformer, and the welding position of the primary wire is difficult to control, which can easily damage the insulating partition.

Therefore, this technical field needs to overcome the shortcomings of the existing technology, solve the problem of modular design and production of transformer components, increase the electrical gap between L and N, improve the insulation performance and withstand voltage level of the product, so as to realize the automation of the assembly of small circuit breakers. While meeting the functional requirements of small circuit breakers, it is necessary to avoid the problem of easy damage to the paint after the enameled wire is bent, which leads to withstand voltage breakdown.

The existing solution 1 - the motor solution has the following disadvantages:

1. Failure to meet the rated withstand impulse voltage 6.2KV test;

2. The welding between the L-pole terminal block and the primary enameled wire of the energy transformer is affected, which may easily damage the insulating partition;

3. The electrical clearance and creepage distance are small, which may easily lead to L and N pole breakdown.

For example, in the mutual inductor structure patent CN211125339U, there are the following disadvantages:

1) In FIG. 1 and FIG. 2, due to the limitation of the shell space, the electrical gap between the L pole and the N pole after assembly is less than 4 mm, and breakdown occurs in the rated withstand voltage test;

2) After the conductive bar 1 and the L-pole enameled wire are assembled, the conductive bar 1 needs to be clamped with needle-nosed pliers to fix the position of the L-pole enameled wire. The semicircular end shape of the conductive bar 1 makes it inconvenient to clamp with needle-nosed pliers, and it cannot be fixed reliably, so that the L-pole enameled wire is easy to loosen and cannot be fixed in the groove of the semicircular end. When the conductive bar 1 and the L-pole enameled wire are soldered, it is easy to cause cold soldering or unstable contact performance, affecting product performance;

3) The conductive bar 1 needs to be bent at three locations on the mold, which makes it difficult to process the parts.

Utility Model Content

The technical problem to be solved by the utility model is to solve the problem of modular design and production of transformer components to realize the automation of small circuit breaker assembly. It solves the problem of facilitating multi-turn winding and various winding methods on the primary side of the transformer while meeting the functional requirements of the small circuit breaker, and at the same time increases the electrical gap between the L pole and the N pole to improve the insulation performance of the product.

In view of the above problems, 1) the conductive bar 1 is improved, as shown in Figures 3 and 4, the improved conductive bar 8. Since the product is limited by the modular size, the volume and internal space are small, the electrical clearance between the L-pole enameled wire 9 and the N-pole enameled wire 10 is increased by increasing the longitudinal height of the conductive bar 8, so as to avoid breakdown in the rated withstand voltage test and improve the insulation performance of the product; 2) after the conductive bar 8 and the L-pole enameled wire 9 are assembled, the long semicircular end thereof is convenient to be clamped with needle-nosed pliers to reliably fix the position of the L-pole enameled wire 9, and the L-pole enameled wire 9 is not easy to loosen and is fixed in the groove of the semicircular end, so as to facilitate the soldering of the conductive bar 8 and the L-pole enameled wire 9 and ensure the reliability of welding; 3) the conductive bar 8 only needs one bend on the mold, so the parts are easy to process and the product size is easy to control.

In order to achieve the above-mentioned purpose, the technical solution of the utility model provides a current transformer structure, which includes a current transformer housing, a conductive bar 1 partially passing through the top of the current transformer housing, and a conductive bar 2 partially passing through the bottom of the current transformer housing.

Preferably, the current transformer housing is provided with a conductive bar one jack and a conductive bar two jack for respectively passing the conductive bar one and the conductive bar two.

Preferably, the current transformer housing is provided with a housing through hole and a connecting conductor jack between the first conductive bar and the second conductive bar.

Preferably, the conductive bar 1 comprises a connecting portion 1, a straight section 1, a connecting portion 2, and a bent portion which are connected in sequence, and a buckle portion and a groove portion are provided in sequence at the connection between the straight section 1 and the connecting portion 2.

Preferably, the conductive bar 2 includes a connecting portion 3, a straight segment 3, a connecting segment, a straight segment 2, and a bent segment 2 which are connected in sequence, and a buckle 2 is provided at the connection between the straight segment 3 and the connecting segment.

Preferably, the second straight section, the connecting section and the third straight section form a U-shape, and the connecting section is arranged at the bottom of the U-shape.

Preferably, notches are provided on the first bent portion and the second straight portion.

Preferably, legs and a terminal block are respectively provided on both sides of the current transformer housing, and a wire slot buckle is further provided on the side where the terminal block is located.

Preferably, the conductive bar 1 may be connected to an equipotential plate.

Addition: Two bosses 205 are added to the connecting plate 2 described in FIG7 , as shown in FIG8 , and fixing plates 206 are installed on the two bosses 205 , and the fixing plates 206 are rectangular parallelepiped , which play a limiting role when the wiring screws are screwed into the wiring frame to avoid damage to the external connecting wires due to excessive torque, and can ensure the reliability of the connection of soft wires or hard wires, and avoid the external wires from loosening from the wiring frame, especially when connecting small current wires.

The technical solution of the utility model also provides a circuit breaker equipped with the above-mentioned current transformer.

In summary, the utility model includes the following beneficial technical effects:

In order to meet the needs of automated assembly of products, the utility model lays the flux transformer flat, solves the transformer assembly problem by bending the enameled wire, and designs the transformer threading. However, due to the large bending angle, the paint is damaged, resulting in instability in the rated withstand impulse voltage 6.2kV test. By improving the connecting piece structure of the L pole of the enameled wire, changing it to an upper and lower staggered structure, increasing the height of the L pole connecting piece and the electrical gap between it and the N pole enameled wire, the rated withstand impulse voltage 6.2kV test was passed.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram 1 mentioned in the background technology;

FIG2 is a second schematic diagram mentioned in the background technology;

FIG3 is a schematic diagram 1 mentioned in the utility model content;

FIG4 is a second schematic diagram mentioned in the utility model content;

FIG5 is a structural schematic diagram 1 of a current transformer structure of the utility model;

FIG6 is a second structural diagram of a current transformer structure of the utility model;

FIG7 is a third structural diagram of a current transformer structure of the utility model;

FIG8 is a schematic structural diagram of a current transformer housing in a current transformer structure of the utility model;

FIG9 is a schematic structural diagram of a conductive bar 1 in a current transformer structure of the utility model;

FIG10 is a schematic diagram of the structure of the conductive bar 2 in a current transformer structure of the utility model;

FIG11 is an assembly diagram of a connection plate in a current transformer structure of the utility model;

FIG12 is a schematic diagram of the structure of a conductive bar before bending in a current transformer structure of the present invention;

FIG13 is a schematic diagram of a structure of a current transformer structure of the utility model after a conductive bar is bent;

FIG14 is a schematic diagram of the structure of the interior of a circuit breaker of the utility model (the conductive bar is not bent);

FIG. 15 is a second schematic diagram of the internal structure of a circuit breaker of the present invention.

Reference numerals:

1. Conductive bar 1; 101. Groove; 102. Buckle part 1; 103. Connecting part 1; 104. Connecting part 2; 105. Straight section 1; 106. Semicircular notch; 2. Conductive bar 2; 201. Bend part 2; 202. Connecting section; 203. Buckle part 2; 204. Connecting part 3; 205. Terminal; 210. Straight section 2; 211. Straight section 3; 3. Connecting conductor; 301. Connecting conductor 1; 302. Connecting conductor 2; 303. Connecting conductor 3; 4. Current transformer housing; 401. Wire slot buckle; 402. Support leg; 403. Terminal block; 404. Conductive bar 2 socket; 405. Housing through hole; 406. Conductive bar 1 socket; 407. Connecting conductor socket; 5. Equipotential sheet;

1', conductive bar 1; 2', conductive bar 2; 3', secondary wire turns; 4', current transformer housing; 41', upper end surface; 5', equipotential plate; 6', L-pole enameled wire; 7', N-pole enameled wire.

Detailed ways

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 without creative work are within the scope of protection of the utility model.

The utility model embodiment discloses a circuit breaker, which is equipped with a current transformer structure, which includes a conductive bar 1, a conductive bar 2, a current transformer housing 4, an equipotential sheet 5 and a connecting conductor; the conductive bar 1 is provided with a groove portion 101, a buckle portion 102, a connecting portion 103, a connecting portion 2 104, a straight section portion 105, and a semicircular notch 106; the semicircular notch 106 at the conductive bar 1 is bent and welded to the L-pole enameled wire of the current transformer; the conductive bar 1 includes a semicircular notch 106 provided at one end, the semicircular notch 106 is connected to one end of the groove portion 101 through the connecting portion 2 104, the other end of the groove portion 101 is connected to one end of the buckle portion 102, and the other end of the buckle portion 102 is connected to the connecting portion 103 through the straight section portion 105.

In order to guide the arc and extinguish the arc, there is usually an equipotential sheet 5 connected to the main conductive circuit, and the conductive bar 1 is connected to the equipotential sheet 5, and the connection form can be welding or riveting. The equipotential sheet 5 is welded or riveted to the connecting portion 2 104 of the conductive bar 1 to achieve electrical connection, and the entire assembly forms a whole, and the relative positions of each part are fixed, which is convenient for automated assembly and welding. The connecting portion 1 103 can be welded or riveted to the connecting conductor 1 301, the connecting conductor 2 302 or the connecting conductor 3 303 to achieve electrical connection.

The current transformer housing 4 is a flat cylinder, with a support foot 402 on one side of the cylindrical arc surface, and a terminal block 403 on the other side of the circular arc surface of the current transformer housing 4 corresponding to the support foot 402; a plurality of through holes are provided at the center of the cylinder of the current transformer housing 4, and one end of the conductive bar 1 and the conductive bar 2 2 pass through different through holes; the two ends of the conductive bar 1 and the conductive bar 2 2 are located outside the cylinder of the current transformer housing 4; one end of the conductive bar 1 arranged on the outside of the cylinder of the current transformer housing 4 is connected to the equipotential plate 5, and the other end is connected to the conductive bar 2 2 through a connecting conductor.

The other end of the conductive bar 1 disposed outside the cylinder of the current transformer housing 4 is connected to the conductive bar 2 2 through a connecting conductor. The conductive bar 1 includes a semicircular notch 106 disposed at one end, the semicircular notch 106 is connected to one end of the groove part 101 through the connecting part 2 104, the other end of the groove part 101 is connected to one end of the buckle part 102, and the other end of the buckle part 102 is connected to the connecting part 1 103 through the straight section part 105. The buckle part 102 is in the shape of a barb, and the barb surface of the buckle part 102 faces one side of the groove part 101.

The conductive bar 2 includes a terminal 205 disposed at one end, one end of the terminal 205 is connected to one end of the straight section 210 through a right angle bend, the other end of the straight section 210 is connected to one end of the straight section 3 211 through a connecting section 202, and the other end of the straight section 3 211 is connected to the connecting section 3 204; the straight section 210, the connecting section 202 and the straight section 3 211 form a U shape, and the connecting section 202 is disposed at the bottom of the U shape; the terminal 205 and the connecting section 3 204 are located on both sides of the straight section 210. A notch is disposed on the straight section 210.

The current transformer housing 4 includes a wire slot buckle 401, a support leg 402, a terminal block 403, a conductive bar two socket 404, a housing through hole 405, a conductive bar one socket 406 and a connecting conductor socket 407. A secondary coil is installed in the current transformer housing 4 for detecting current signals, voltage signals, or for providing energy to the control circuit. There are multiple wire slot buckles 401 on the outer surface, which are used to fix the connecting conductors as the primary side, such as the connecting conductor two 302 and the connecting conductor three 303; the support leg 402 allows the current transformer housing 4 to be fixedly installed in the circuit breaker; the terminal block 403 is the lead-out terminal block 403 of the secondary coil, which is connected in the form of a hard pin for easy automatic assembly. The conductive bar one socket 406 is used as an insertion hole for the conductive bar one 1, the conductive bar two socket 404 is used as an insertion hole for the conductive bar two 2, and the connecting conductor socket 407 is used as a socket such as the connecting conductor two 302 or the connecting conductor three 303.

In order to meet the needs of automated assembly of products, the utility model lays the flux transformer flat, solves the transformer assembly problem by bending the enameled wire, and designs the transformer threading. However, due to the large bending angle, the paint is damaged, resulting in instability in the rated withstand impulse voltage 6.2kV test. By improving the connecting piece structure of the L pole of the enameled wire, changing it to an upper and lower staggered structure, increasing the height of the L pole connecting piece and the electrical gap between it and the N pole enameled wire, the rated withstand impulse voltage 6.2kV test was passed.

Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The current transformer structure is characterized by comprising a current transformer shell (4), a first conductive row (1) which is partially penetrated through the top of the current transformer shell (4), and a second conductive row (2) which is partially penetrated through the bottom of the current transformer shell (4).

2. A current transformer structure according to claim 1, characterized in that the current transformer housing (4) is provided with a first busbar jack (406) and a second busbar jack (404) for the first and second busbars (1, 2) to pass through, respectively.

3. A current transformer structure according to claim 2, characterized in that the current transformer housing (4) is provided with a housing through hole (405) and a connection conductor socket (407) between the first conductor bar (1) and the second conductor bar (2).

4. A current transformer structure according to claim 3, wherein the first conductive strip (1) comprises a first connecting part (103), a first straight section part (105), a second connecting part (104) and a bent first connecting part which are sequentially connected, and a first buckling part (102) and a groove part (101) are sequentially arranged at the connecting part of the first straight section part (105) and the second connecting part (104).

5. The current transformer structure according to claim 4, wherein the second conductive row (2) comprises a third connecting portion (204), a third straight portion (211), a connecting portion (202), a second straight portion (210) and a second bending portion (201) which are sequentially connected, and a second clamping portion (203) is arranged at a connection position of the third straight portion (211) and the connecting portion (202).

6. The current transformer structure according to claim 5, wherein the straight section two part (210), the connecting section (202) and the straight section three part (211) form a U-shape, and the connecting section (202) is disposed at the bottom of the U-shape.

7. The current transformer structure of claim 6, wherein the bent first portion and the straight portion (210) are provided with notches.

8. The current transformer structure according to claim 1, wherein two sides of the current transformer housing (4) are respectively provided with a supporting leg (402) and a wire holder (403), and a wire slot buckle (401) is further arranged on one side where the wire holder (403) is located.

9. A current transformer structure according to claim 1, characterized in that the conductor bars (1) are connectable with equipotential sheets (5).

10. A circuit breaker, characterized in that a current transformer as claimed in any one of claims 1-9 is provided.