CN220208728U - Zero sequence current transformer and circuit breaker - Google Patents

Abstract

The utility model belongs to the technical field of piezoelectric devices, and discloses a zero sequence current transformer and a circuit breaker. The zero sequence current transformer comprises a shell and an iron core assembly, wherein the shell comprises an annular groove, a circuit board mounting groove arranged on one side of the annular groove and a first connecting passage communicated with the annular groove and the circuit board mounting groove, and the circuit board mounting groove is used for mounting a circuit board; the iron core assembly is installed in the annular groove, and the iron core assembly comprises a lead wire, and the lead wire penetrates through the first connecting circuit to be electrically connected to the circuit board. By integrating the circuit board mounting groove on the shell of the zero sequence current transformer, the circuit arrangement of the lead is simplified, and the lead is protected.

Description

Zero sequence current transformer and circuit breaker

Technical Field

The utility model relates to the technical field of piezoelectric devices, in particular to a zero sequence current transformer and a circuit breaker.

Background

Molded case circuit breakers with residual current protection are widely used in low voltage power grids to prevent accidents such as personal electric shock, electrical fire, personal injury due to ground faults, and damage to electrical equipment. The collection of the leakage signal is mainly realized by the current vector sum in the zero sequence current transformer induction loop, and then the leakage signal is converted into a level signal through an electronic circuit and is output to the tripping device.

The zero sequence current transformer and the circuit board electrically connected with the zero sequence current transformer are arranged at intervals in the prior art, so that a connecting line between the zero sequence current transformer and the circuit board is longer, the arrangement is complex, and a connecting line is damaged due to contact friction between the connecting line and other parts inside the circuit breaker.

Therefore, it is needed to provide a zero sequence current transformer and a circuit breaker to solve the above problems.

Disclosure of Invention

According to one aspect of the utility model, the zero sequence current transformer is provided, and the circuit board mounting groove is integrated on the shell of the zero sequence current transformer, so that the circuit arrangement of the lead wires is simplified, and the lead wires are protected.

To achieve the purpose, the utility model adopts the following technical scheme:

a zero sequence current transformer comprising:

the circuit board mounting groove is used for mounting a circuit board;

the iron core assembly is installed in the annular groove and comprises a lead wire, and the lead wire penetrates through the first connecting circuit to be electrically connected with the circuit board.

Optionally, the annular groove and the circuit board mounting groove are of an integrated structure.

Optionally, the first connecting channel includes set up in the annular groove with the protection groove between the circuit board mounting groove, be equipped with the intercommunication on one lateral wall of protection groove the protection groove with the first breach of annular groove, be equipped with the intercommunication on the other lateral wall of protection groove the protection groove with the second breach of circuit board mounting groove.

Optionally, first clamping grooves are formed in two opposite side walls of the circuit board mounting groove, and two opposite ends of the circuit board are respectively clamped in the corresponding first clamping grooves.

Optionally, each first clamping groove is formed by surrounding the side wall of the circuit board mounting groove and two convex ribs arranged on the side wall of the circuit board mounting groove at intervals.

Optionally, a second connection passage is arranged on the side wall of the circuit board mounting groove and is used for communicating the circuit board mounting groove with the outside.

Optionally, the side wall of the circuit board mounting groove is provided with a reinforcing rib.

Optionally, the housing further includes an insulating cover plate, and the insulating cover plate is covered on the circuit board mounting groove.

Optionally, the two opposite side walls of the circuit board mounting groove are provided with second clamping grooves, the two opposite ends of the insulating cover plate are provided with clamping protrusions, and the two clamping protrusions are respectively clamped in the corresponding second clamping grooves.

Optionally, the annular groove encloses to be established and forms rectangular shape centre bore, zero sequence current transformer still includes a plurality of direct-line structure's conducting bars, and is a plurality of the conducting bars are followed rectangular shape centre bore's length direction is arranged in proper order and wears to locate rectangular shape centre bore.

Optionally, the iron core assembly includes an iron core, a coil wound on the iron core, and an electromagnetic shielding cover, where the electromagnetic shielding cover is covered on the iron core and the coil; and/or the number of the groups of groups,

and a resin layer is arranged between the iron core component and the annular groove, and the resin layer is formed by casting resin between the iron core component and the annular groove.

According to another aspect of the utility model, the utility model further provides a circuit breaker, which comprises a circuit board and the zero sequence current transformer according to any one of the technical schemes, wherein the circuit board is arranged in the circuit board mounting groove.

The utility model has the beneficial effects that:

the utility model provides a zero sequence current transformer which comprises a shell and an iron core assembly, wherein the shell comprises an annular groove, a circuit board mounting groove and a first connecting passage. The annular groove is used for installing the iron core assembly, the circuit board installing groove is used for installing the circuit board, and the lead wire of the iron core assembly penetrates through the first connecting circuit to be electrically connected to the circuit board. By integrating the circuit board mounting groove at one side of the annular groove, the iron core component and the circuit board are integrated, on one hand, compared with the arrangement of the zero sequence current transformer and the circuit board at intervals in the prior art, the distance between the iron core component and the circuit board is shortened, the lead length of the iron core component can be shortened, and consumable materials are reduced; on the other hand, the lead wire is electrically connected to the circuit board through the first connecting circuit, so that the difficulty in arrangement of the lead wire is reduced, the lead wire can be prevented from being damaged due to contact friction between the lead wire and other parts in the circuit breaker, the lead wire is protected, and the working reliability of the zero sequence current transformer is further improved.

The utility model also provides a circuit breaker which comprises a circuit board and the zero sequence current transformer. The circuit breaker is compact in structure and simple in installation procedure.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following description will briefly explain the drawings needed in the description of the embodiments of the present utility model, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the contents of the embodiments of the present utility model and these drawings without inventive effort for those skilled in the art.

Fig. 1 is a schematic structural view of a housing (insulating cover plate not shown) provided in an embodiment of the present utility model;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

fig. 3 is a schematic structural diagram of a zero sequence current transformer according to an embodiment of the present utility model (an insulating cover plate is not covered on a circuit board mounting slot);

fig. 4 is a schematic structural diagram II of a zero sequence current transformer provided by the embodiment of the utility model (an insulating cover plate covers a circuit board mounting groove);

fig. 5 is an assembly view of a conductive strip, a double-gold, and an armature provided by an embodiment of the utility model.

In the figure:

100. a housing; 110. an annular groove; 120. a circuit board mounting groove; 121. a first clamping groove; 1211. convex ribs; 122. a second connection path; 123. reinforcing ribs; 124. a second clamping groove; 130. a first connection path; 131. a protective groove; 132. a first notch; 133. a second notch; 140. an insulating cover plate; 141. a clamping protrusion; 150. a elongated central bore; 200. an iron core assembly; 300. a circuit board; 400. a conductive bar; 500. a bracket; 600. double-gold; 700. an armature; 800. an elastic member.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are orientation or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

The present embodiment provides a zero sequence current transformer, in which the circuit board mounting groove 120 is integrated on the housing 100 of the zero sequence current transformer, so as to simplify the circuit arrangement of the lead wires and facilitate the protection of the lead wires.

In particular, as shown in fig. 1-4, the zero sequence current transformer includes a housing 100 and a core assembly 200. Wherein, the housing 100 includes an annular groove 110, a circuit board mounting groove 120, and a first connection path 130, and the first connection path 130 communicates the annular groove 110 and the circuit board mounting groove 120. The core assembly 200 is mounted in the annular recess 110, and the core assembly 200 includes a lead wire (not shown) electrically connected to the circuit board 300 through the first connection path 130. By integrating the circuit board mounting groove 120 at one side of the annular groove 110, the iron core assembly 200 and the circuit board 300 are integrated together, on one hand, compared with the arrangement of the zero sequence current transformer and the circuit board 300 at intervals in the prior art, the distance between the iron core assembly 200 and the circuit board 300 is shortened, and further the lead length of the iron core assembly 200 can be shortened, and consumable materials are reduced; on the other hand, the lead wire is electrically connected to the circuit board 300 through the first connecting channel 130, so that the difficulty in arrangement of the lead wire is reduced, the lead wire can be prevented from being damaged due to contact friction with other parts in the circuit breaker, the lead wire is protected, and the working reliability of the zero sequence current transformer is further improved.

Alternatively, in the present embodiment, the annular groove 110 and the circuit board mounting groove 120 are integrally formed, that is, the housing 100 may be integrally formed by injection molding, which is simple in injection molding process, low in cost, and convenient for mass production.

Optionally, with continued reference to fig. 2, a protective slot 131 is provided between the annular recess 110 and the circuit board mounting slot 120, the protective slot 131 being used to protect the leads of the core assembly 200. Specifically, a first notch 132 is formed on one side wall of the protection slot 131, which communicates with the protection slot 131 and the annular groove 110, and a second notch 133 is formed on the other side wall of the protection slot 131, which communicates with the protection slot 131 and the circuit board mounting slot 120, and the first notch 132, the protection slot 131 and the second notch 133 are sequentially communicated to form the first connecting channel 130. The lead wires are arranged in the protective groove 131, so that the lead wires can be effectively protected, and the lead wires are prevented from being damaged due to contact friction with other parts inside the circuit breaker.

Further, the iron core assembly 200 generally includes two leads, so for the sake of clearer circuit arrangement, two first notches 132 are provided, and the two leads respectively pass through the two first notches 132. Likewise, two second notches 133 may be provided for two leads to pass through, respectively. Of course, the number of the first notches 132 and the second notches 133 may be set to be other, and the present application is not particularly limited.

Optionally, in this embodiment, two first notches 132 and four second notches 133 are provided, and the lead may optionally pass through one of the second notches 133.

Further, with continued reference to fig. 1 and 2, the side wall of the circuit board mounting groove 120 is provided with a second connection passage 122, and the second connection passage 122 is used for communicating the circuit board mounting groove 120 with the outside. Specifically, the A, B, C, N sample lead inside the circuit breaker passes through the second connecting passage 122 from the outside into the board mounting groove 120 to be electrically connected with the circuit board 300. By arranging the second connecting passage 122, the circuit board 300 and the A, B, C, N sampling lead can be connected in a straight line, and the difficulty of circuit arrangement is reduced.

Alternatively, the second connection path 122 may be a through hole formed on a side wall of the circuit board mounting slot 120, or may be an escape opening formed on a side wall of the circuit board mounting slot 120, or the like, which is set according to actual needs. The second connection path 122 may optionally be, but is not limited to, opened on a sidewall of the top of the board mounting groove 120.

Further, with continued reference to fig. 1 and 2, in order to enhance the structural strength of the circuit board mounting groove 120, reinforcing ribs 123 are provided on the side walls of the circuit board mounting groove 120. Alternatively, one or a plurality of reinforcing ribs 123 may be provided, and in this embodiment, two reinforcing ribs 123 are provided, and two reinforcing ribs 123 are symmetrically provided on the upper and lower opposite side walls of the board mounting groove 120. In other embodiments, the number and arrangement of the reinforcing ribs 123 may be other, which is not specifically limited in this application.

Alternatively, the shape of the reinforcing rib 123 may be a straight bar, a zigzag shape, or a wavy shape, which is set according to actual needs, and the application is not specifically limited.

Further, with continued reference to fig. 1-3, first clamping grooves 121 are disposed on two opposite sidewalls of the circuit board mounting groove 120, and two opposite ends of the circuit board 300 are respectively clamped in the corresponding first clamping grooves 121. The connection mode of the clamping facilitates the installation and the disassembly of the circuit board 300.

Alternatively, in the present embodiment, each first card slot 121 is defined by a side wall of the board mounting slot 120 and two ribs 1211 provided at intervals on the side wall of the board mounting slot 120. In other embodiments, the clamping groove may be concavely formed on the side wall of the circuit board mounting groove 120, and may be set according to actual needs.

Further, with continued reference to fig. 3 and 4, the housing 100 further includes an insulating cover plate 140, and the insulating cover plate 140 covers the circuit board mounting slot 120. Through setting up insulating apron 140, can realize that circuit board 300 and external isolation are favorable to protecting circuit board 300, avoid circuit board 300 and the inside other electrified parts contact of circuit breaker and take place the short circuit.

Optionally, with continued reference to fig. 3 and 4, the opposite side walls of the circuit board mounting groove 120 are provided with second clamping grooves 124, and the opposite ends of the insulating cover plate 140 are provided with clamping protrusions 141, and the two clamping protrusions 141 are respectively clamped in the corresponding second clamping grooves 124. The connection between the insulating cover plate 140 and the circuit board mounting groove 120 is realized through the clamping connection between the clamping protrusion 141 and the second clamping groove 124, so that the mounting difficulty of the insulating cover plate 140 can be reduced, and the insulating cover plate 140 can be conveniently mounted and dismounted.

The zero sequence current transformer among the prior art is mostly circular, and A, B, C, N looks conductive copper bars are arranged in proper order, and the arrangement length of conductive copper bars is greater than the diameter of zero sequence current transformer interior circle, consequently, A, B, C, N looks conductive copper bars need pass zero sequence current transformer's interior circle after welding, repeatedly bending, segmentation connection, this structure that makes conductive copper bars is comparatively complicated, and the assembly is difficult, and the consumptive material is more simultaneously.

Based on the above problems, the zero sequence current transformer provided in this embodiment can make the conductive bar 400 pass through directly without bending, so as to reduce the assembly difficulty and the consumable of the conductive bar 400.

Specifically, with continued reference to fig. 1, fig. 3 and fig. 4, the annular groove 110 encloses an elongated central hole 150, and the zero sequence current transformer further includes a plurality of conductive bars 400 having a straight-line structure, and the plurality of conductive bars 400 are sequentially arranged along the length direction of the elongated central hole 150 and pass through the elongated central hole 150. The arrangement of the strip-shaped center hole 150 enables the conductive bar 400 to directly pass through, and compared with the prior art that the conductive bar 400 can pass through the inner circle of the zero sequence current transformer after being welded, repeatedly bent and connected in a segmented mode, the conductive bar 400 has fewer consumable materials and is simple to assemble.

Alternatively, the shape of the elongated central hole 150 may be oval, rectangular, etc., and may be set according to actual needs.

Further, the iron core assembly 200 includes an iron core, a coil wound around the iron core, and an electromagnetic shield cover disposed on the iron core and the coil, and terminals of the coil are the above-mentioned leads. By arranging the electromagnetic shielding cover, the iron core and the coil can be helped to shield interference electromagnetic waves.

Optionally, in this embodiment, a resin layer is further provided between the core assembly 200 and the annular groove 110. Specifically, the resin layer is formed by casting resin between the core assembly 200 and the annular groove 110, and the arrangement of the resin layer can play a role in fixing the core assembly 200 as well as an insulating role.

Further, as shown in fig. 5, the zero sequence current transformer further includes a double-metal 600, an armature 700, a bracket 500, and an elastic member 800, and the conductive strip 400 is fixed to the bracket 500 after passing through the elongated central hole 150. The double-metal 600 is connected with the conductive bar 400, the armature 700 is rotatably connected with the bracket 500, and an elastic piece 800 is arranged between the armature 700 and the bracket 500. The elastic member 800 is optionally but not limited to a spring.

When a short-circuit current is generated in the circuit breaker, the armature 700 is attracted to the static core of the circuit breaker to trip the circuit breaker, and at this time, the elastic member 800 is stretched. When no short-circuit current is generated, the armature 700 is kept separated from the stationary core by the tension of the elastic member 800.

When the circuit breaker is overloaded, the temperature of the conductive bar 400 is rapidly increased, and the double-metal 600 is connected with the conductive bar 400, so that the conductive bar 400 can transfer heat to the double-metal 600, and the double-metal 600 is contacted with the traction rod of the circuit breaker after being deformed, thereby realizing tripping.

The present embodiment further provides a circuit breaker, which includes a circuit board 300 and the zero sequence current transformer, where the circuit board 300 is installed in the circuit board installation slot 120. The circuit breaker adopts the zero sequence current transformer, so that the circuit breaker is compact in structure and simple in installation procedure.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the utility model. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (10)

1. The zero sequence current transformer is characterized by comprising:

a housing (100), wherein the housing (100) comprises an annular groove (110), a circuit board mounting groove (120) arranged at one side of the annular groove (110) and a first connecting passage (130) communicated with the annular groove (110) and the circuit board mounting groove (120), and the circuit board mounting groove (120) is used for mounting a circuit board (300);

and the iron core assembly (200) is arranged in the annular groove (110), and the iron core assembly (200) comprises a lead wire which passes through the first connecting passage (130) and is electrically connected with the circuit board (300).

2. The zero sequence current transformer according to claim 1, characterized in that the first connection path comprises a protection slot (131) arranged between the annular groove (110) and the circuit board mounting slot (120), a first notch (132) which is communicated with the protection slot (131) and the annular groove (110) is arranged on one side wall of the protection slot (131), and a second notch (133) which is communicated with the protection slot (131) and the circuit board mounting slot (120) is arranged on the other side wall of the protection slot (131).

3. The zero sequence current transformer according to claim 1, wherein first clamping grooves (121) are formed in two opposite side walls of the circuit board mounting groove (120), and two opposite ends of the circuit board (300) are respectively clamped in the corresponding first clamping grooves (121).

4. The zero sequence current transformer according to claim 1, characterized in that a second connecting passage (122) for communicating the circuit board mounting groove (120) with the outside is arranged on the side wall of the circuit board mounting groove (120).

5. The zero sequence current transformer according to claim 1, characterized in that the side wall of the circuit board installation slot (120) is provided with a reinforcing rib (123).

6. The zero sequence current transformer according to claim 1, characterized in that the housing (100) further comprises an insulating cover plate (140), the insulating cover plate (140) covering the circuit board mounting slot (120).

7. The zero sequence current transformer according to claim 6, wherein the two opposite side walls of the circuit board mounting groove (120) are provided with second clamping grooves (124), the two opposite ends of the insulating cover plate (140) are provided with clamping protrusions (141), and the two clamping protrusions (141) are respectively clamped in the corresponding second clamping grooves (124).

8. The zero sequence current transformer according to any one of claims 1 to 7, wherein the annular groove (110) is surrounded to form a strip-shaped central hole (150), the zero sequence current transformer further comprises a plurality of conducting bars (400) with straight-line structures, and the conducting bars (400) are sequentially arranged along the length direction of the strip-shaped central hole (150) and penetrate through the strip-shaped central hole (150).

9. The zero sequence current transformer according to any one of claims 1-7, characterized in that the core assembly (200) comprises a core, a coil wound around the core and an electromagnetic shield, the electromagnetic shield being provided to the core and the coil; and/or the number of the groups of groups,

a resin layer is provided between the core assembly (200) and the annular groove (110), and the resin layer is formed by casting resin between the core assembly (200) and the annular groove (110).

10. Circuit breaker, characterized by comprising a circuit board (300) and a zero sequence current transformer according to any of claims 1-9, said circuit board (300) being mounted in a circuit board mounting slot (120).