A current transformer assembly

Abstract

The application discloses a current transformer assembly which comprises a ring-shaped current transformer, a shell for containing the current transformer, a plurality of current-carrying components, and a plurality of terminal blocks connected with the current-carrying components respectively, and further comprises a supporting member which is fixed in cooperation with the current transformer, wherein the current-carrying components are made of rigid conductive material, and the current-carrying components are fixed in the inner hole of the current transformer in cooperation with the supporting member. The application has simple assembly process and stable operation.

Description

TECHNICAL FIELD

[0001] The present application relates to a current transformer assembly. BACKGROUND

[0002] CN207664003U discloses a leakage circuit breaker, which comprises a multi-stage circuit breaker body, a leakage module body, a cover, a base, a partition shell arranged between the cover and the base, and wiring terminals arranged on both sides of the multi-stage circuit breaker body and the leakage module body. The multi-stage circuit breaker body and the leakage module body are arranged side by side. The multi-stage circuit breaker body comprises a moving contact, a stationary contact, a trip mechanism, a moving iron core, a stationary iron core, and a coil surrounding the stationary iron core. One end of the coil is connected to the stationary contact, and the other end is provided with a conversion connecting piece (i.e. a circuit breaker connecting plate). A zero sequence transformer (i.e. a current transformer) is arranged between the conversion connecting piece and the wiring terminal. A wire passes through the internal region of the zero sequence transformer, and the two ends of the wire are connected to the wiring terminal and the conversion connecting piece, respectively (generally by spot welding). The wire is a plurality of "U" shaped wires. A zero line is arranged between a group of the wiring terminals, and the zero line passes through the zero sequence transformer.

[0003] In the above patent, the zero sequence transformer mainly relies on a plurality of flexible wires to achieve tension positioning, lacks stable support positioning structure, is prone to shaking, is not conducive to assembly, and even the wires may be entangled or interfere with each other, which leads to poor contact of the product and affects the service life. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides a current transformer assembly which is simple to assemble and more stable in operation.

[0005] To achieve the above-mentioned purpose, the present application provides a current transformer assembly, which comprises a ring-shaped current transformer, a shell for accommodating the current transformer, a plurality of current-carrying components, and wiring terminals connected to the current-carrying components, respectively. A support member is further provided for cooperation and installation with the current transformer. The current-carrying components are made of rigid conductive material, and the current-carrying components are simultaneously fixed in the inner hole of the current transformer in cooperation with the support member.

[0006] The current-carrying components are made of rigid conductive material, and the relative positions of the plurality of current-carrying components and the current transformer are kept fixed by the support member. Therefore, the current transformer is not prone to shaking, the current-carrying components fixed in the inner hole of the current transformer are not prone to interference, the assembly process is relatively simple, and the operation is more stable.

[0007] Further, at least one of the current-carrying components comprises a recess for embedding the edge of the current transformer, and the two sides of the recess can form axial limiting for the current transformer.

[0008] The further provided advantage is that the two sides of the recess can form axial limiting for the current transformer, preventing the current transformer from axial shaking, thereby further improving the stability of the current transformer.

[0009] Further, the current-carrying components with the recess are at least two and symmetrically distributed along the center of the inner hole of the current transformer.

[0010] The further provided advantage is that through the at least two current-carrying components with the recess, the stress between the current transformer and the current-carrying components can be more stable, thereby further improving the stability of the current transformer.

[0011] Further, the current-carrying components with the recess comprise a lacquered wire passing through the current transformer, and the lacquered wire is shaped by bending and forms the recess.

[0012] The further provided advantage is that the support can isolate the current-carrying components, the lacquered wire itself has the ability to be insulated from the outside, under the double insulation of the support and the lacquered wire, the stability of the product during operation can be further improved, the lacquered wire shaped by bending is not easy to bend during use and assembly, can form a better limiting effect on the current transformer, and in addition, is convenient for automatic processing.

[0013] Further, one end of the current-carrying component is electrically fixedly connected with the terminal block, the other end of the current-carrying component has an electrically connecting plate, the electrically connecting plates of the other ends of the current-carrying components are obliquely arranged at the same angle, and an oval connecting hole is formed in the electrically connecting plate.

[0014] The further provided advantage is that one end of the current-carrying component is electrically fixedly connected with the terminal block, when the terminal block is installed on the shell and keeps relative fixation with the shell, the current-carrying component can also keep relative fixation with the shell, thereby the current transformer can also keep relative fixation, thereby providing better stability and reducing shaking of the components.

[0015] The circuit breaker connecting plate connected with the static iron core coil realizes surface contact, thereby improving the electrical connection effect, and the oval connecting hole is convenient for locking and fixedly cooperating with the circuit breaker connecting plate through a screw.

[0016] Further, one end of the current-carrying component is provided with a lead wire.

[0017] Further, the lead wire is arranged to provide power support for the circuit board in the circuit breaker.

[0018] Further, the support member comprises a plurality of end faces arranged on the side wall of the inner hole of the current transformer, and the end faces are respectively provided with a first groove for embedding and fixing the current-carrying component and a second groove for installing the N-phase conductor or test winding.

[0019] Further, the first groove is arranged to realize stable embedding and fixing cooperation between the current-carrying component and the support member, and the second groove is arranged to leave a certain gap between the support member and the side wall of the inner hole of the current transformer, so as to facilitate the installation of the N-phase conductor or test winding.

[0020] Further, the first groove is provided with a limiting structure for limiting the current-carrying component at least at one end along the axial direction of the current transformer.

[0021] Further, the first groove is arranged to realize stable embedding and fixing cooperation between the current-carrying component and the support member, and the second groove is arranged to leave a certain gap between the support member and the side wall of the inner hole of the current transformer, so as to facilitate the installation of the N-phase conductor or test winding.

[0022] Further, the shell comprises a cover and a base assembled and connected, the cover is provided with a first insertion slot for inserting the terminal block on one side of the base, the first insertion slots are separated from each other by a first phase spacing plate, the first insertion slots are provided with a first side spacing plate on one side of the current transformer, the base is provided with a second insertion slot for inserting the terminal block on one side of the cover, the second insertion slots are separated from each other by a second phase spacing plate, the second insertion slots are provided with a second side spacing plate on one side of the current transformer, the second side spacing plate of the base is provided with a notch for penetrating and supporting the terminal board, and the first insertion slot and the second insertion slot, the first phase spacing plate and the second phase spacing plate, and the first side spacing plate and the second side spacing plate are connected together when the cover and the base are assembled and connected.

[0023] Further, the shell is assembled and connected by the cover and the base, which facilitates the installation of the terminal block, the current transformer and the support member, and when the cover and the base are assembled and connected, the accommodation cavity formed by the connection of the first insertion slot and the second insertion slot can be used to accommodate the terminal block, the connection between the first phase spacing plate and the second phase spacing plate and the connection between the first side spacing plate and the second side spacing plate can provide stronger inter-pole insulation protection, the notch can provide better support and positioning for the terminal board, and the penetration of the terminal board is facilitated.

[0024] Further, two sides of the base are provided with connecting lateral grooves, two sides of the cover are provided with first buckle structures corresponding to the connecting lateral grooves, a top edge of the cover corresponding to one side of the current transformer is provided with a second buckle structure, and a bottom edge of the base corresponding to one side of the current transformer is provided with a wire outlet groove, so that the wires or lead wires can be conveniently arranged from the inside of the shell.

[0025] The further provided connecting lateral grooves, first buckle structures and second buckle structures facilitate reliable connection between the shell and the multi-stage circuit breaker body.

[0026] Further, the other side of the base opposite to the current transformer is provided with a terminal port, one side of the base corresponding to the terminal port is provided with a mounting hook, the other side of the cover opposite to the current transformer is provided with a clamping groove matched with the hook, at least one group of corresponding first phase spacing plates and second phase spacing plates are provided with screw mounting holes, and a fixing screw for locking and fixing the cover and the base together is arranged in the screw mounting hole.

[0027] The further provided cover and base are assembled and connected in the following manner: the terminal is first arranged along the first insertion groove or the second insertion groove, then the second phase spacing plate of the base is inserted along the guide groove of the cover, then the clamping and matching of the cover and the base is formed through the hook and the clamping groove, and finally the fixing screw is arranged along the screw mounting hole to lock and fix the cover and the base together, so that the cover and the base are not easily separated.

[0028] Further, the second side spacing plate of the base is provided with a boss matched with a support, and the support further comprises an abutting portion, a clamping portion and a supporting leg.

[0029] The further provided clamping portion is used for clamping and matching with the shell to prevent the support and the shell from being separated, the abutting portion and the four surrounding side walls of the boss form abutting and limiting matching to prevent the support and the shell from shaking, and the supporting leg is arranged based on the supporting and lifting effect of the support, so as to further improve the stability of the connection between the support and the shell. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 The figure is a structural diagram of an embodiment of the application.

[0031] Figure 2 The figure is an exploded view of an embodiment of the application.

[0032] Figure 3 Assembly view of the support in the embodiment of the present application;

[0033] Figure 4 Assembly view of the current carrying component in the embodiment of the present application;

[0034] Figure 5 Rear view of the current carrying component in the embodiment of the present application;

[0035] Figure 6 Side view of the current carrying component in the embodiment of the present application;

[0036] Figure 7 Structure of the support in the embodiment of the present application Figure 1 ;

[0037] Figure 8 Structure of the cover in the embodiment of the present application Figure 1 ;

[0038] Figure 9 Structure of the cover in the embodiment of the present application Figure 2 ;

[0039] Figure 10 Structure of the base in the embodiment of the present application;

[0040] Figure 11 Assembly view of the support and the housing in the embodiment of the present application;

[0041] Figure 12 is an enlarged view of part A in Figure 11 ;

[0042] Figure 13 Assembly view of the support and the housing in the embodiment of the present application;

[0043] Figure 14 is an enlarged view of part B in Figure 13 ;

[0044] Figure 15 Structure of the support in the embodiment of the present application Figure 2 . DETAILED DESCRIPTION

[0045] The current transformer assembly of the present application is used to form a component of a multi-stage circuit breaker, and the embodiment thereof is as follows Figures 1-15As shown: It includes a ring-shaped current transformer 1, a housing 2 for housing the current transformer 1, several current-carrying components, and terminals 3 connected to these current-carrying components respectively. It also includes a support member 4 that is installed and fixed in conjunction with the current transformer 1. The current-carrying components are made of rigid conductive material, which has good conductivity and is not easy to bend. The support member 4 is made of insulating material. These current-carrying components are installed and fixed in the inner hole of the current transformer 1 together with the support member 4. The support member 4 can support and position the current-carrying components that pass through the current transformer 1, and at the same time, it uses the insulating properties of the material to enhance the insulation function between the electrodes.

[0046] In this embodiment, three current-carrying components are used, but in other examples, one, two, or more may be used. These three current-carrying components correspond to phases A, B, and C respectively (i.e., 5a, 5b, and 5c in the figure). Two of these current-carrying components (5a and 5c) include recesses 51 into which the edge of the current transformer 1 can be inserted. The two sides of the recesses 51 can form axial restraints on the current transformer 1, preventing it from wobbling along its axial direction. The current-carrying components (5a and 5c) with recesses 51 are symmetrically distributed along the center of the inner hole of the current transformer (e.g., ...). Figure 5 (As shown).

[0047] The current-carrying components (5a, 5c) with notches include enameled wires 52 passing through the current transformer 1. The enameled wires 52 are shaped by bending and forming the notches 51. The enameled wires 52 are preferably single-core enameled wires. Using single-core enameled wires can enhance the external insulation performance and facilitate the welding of both ends, ensuring more convenient connection or automated assembly or measurement.

[0048] One end of each current-carrying component (5a, 5b, 5c) is electrically fixedly connected to the terminal block 3. A terminal plate 53, constituting one of the components of the terminal block 3, is welded and fixed to one end of each current-carrying component (5a, 5b, 5c). The terminal block 3 also includes a terminal screw 31 that cooperates with the terminal plate 53 to clamp and connect external wires. The other end of each current-carrying component (5a, 5b, 5c) has an electrical connection plate 6. The electrical connection plates 6 at the other ends of the several current-carrying components (5a, 5b, 5c) are inclined at the same angle, preferably on the same plane, which provides better contact conductivity and facilitates automated assembly. The electrical connection plate 6 has an elliptical connection hole 61 (e.g., ...). Figures 4-6 (As shown). The other current-carrying component (5b) and its two ends, the terminal blocks 53 and electrical connection plates 6, are all integrally stamped from conductive cold-rolled sheet metal, reducing the connections between parts and thus lowering contact resistance. One end of the current-carrying component is provided with a lead 7, the end of which connects to the circuit board in the multi-stage circuit breaker, facilitating the provision of power to the circuit board within the circuit breaker.

[0049] The support 4 comprises end faces arranged on the inner hole side wall of the corresponding current transformer 1, and in the embodiment, the support 4 comprises four end faces, i.e. upper, lower, left and right end faces. The upper, left and right end faces are respectively provided with a first groove 41 and a second groove 42 for embedding and fixing the current-carrying component. The second groove 42 is arranged to keep a certain gap c (as shown in the figure) between the support 4 and the inner hole side wall of the current transformer 1, which facilitates the installation of the N-phase conductor d or the test winding. The two first grooves 41 on the corresponding left and right end faces are respectively matched with the two current-carrying components (5a, 5c) having notches. Figure 5 The first groove 41 has a limiting structure at one end along the axial direction of the current transformer, which includes a supporting recess 411 arranged on the left and right end faces of the support 4 and directed to one end of the electric connection plate 6, and an abutting inclined surface 412 arranged on the upper end face of the support 4 and directed to both ends of the electric connection plate 6 and the wiring plate 53. When the bent corner of the enameled wire 52 of the current-carrying component (5a, 5c) is embedded in the supporting recess 411, the supporting recess 411 can limit and support the current-carrying component (5a, 5c), and the abutting inclined surface 412 can limit the current-carrying component (5b) along the axial direction of the current transformer 1, thereby improving the stability of the matching between the current-carrying component (5a, 5b, 5c) and the support 4 and reducing the shaking.

[0050] The shell 2 comprises an assembled cover 21 and a base 22, the cover 21 is provided with first insertion slots 211 corresponding to the base 22 for inserting the terminal block 3, the first insertion slots 211 are separated by the first phase interval plate 212 on the cover 21, the first insertion slots 211 are provided with the first side partition plate 213 corresponding to one side of the current transformer 1, the base 22 is provided with second insertion slots 221 corresponding to one side of the cover 21 for inserting the terminal block 3, the second insertion slots 221 are separated by the second phase interval plate 222 on the base 22, the second insertion slots 221 are provided with the second side partition plate 223 corresponding to one side of the current transformer 1, both sides of the base 22 are provided with connecting side grooves 224, both sides of the cover 21 are provided with first buckle structures 214 corresponding to the connecting side grooves 224, the first insertion slots 211 and the second insertion slots 221, the first phase interval plate 212 and the second phase interval plate 222, the first side partition plate 213 and the second side partition plate 223 can be connected together when the cover 21 and the base 22 are assembled, the second side partition plate 223 of the base 22 is provided with a gap 225 for passing and supporting the positioning terminal plate 53, the side opposite to the current transformer 1 of the base 22 is provided with a terminal port 226, the side of the base 22 corresponding to the terminal port 226 is provided with a mounting hook 227, the side opposite to the current transformer 1 of the cover 21 is provided with a card slot 215 matched with the hook 227, at least one set of corresponding first phase interval plate 212 and second phase interval plate 222 are provided with screw mounting holes 23, the fixing screw for locking and fixing the cover 21 and the base 22 together is passed through the screw mounting hole 23, the screw mounting hole 23 arranged on the corresponding first phase interval plate 212 and the second phase interval plate 222 is beneficial to make the structure more compact and make the stress between the cover 21 and the base 22 more uniform, the bottom edge of the base 22 corresponding to one side of the current transformer 1 is provided with a wire outlet groove 228, the wire or lead wire is conveniently passed out of the shell 2 through the wire outlet groove 228, the cover 21 is provided with screw holes 216 corresponding to the positions of the terminal blocks 3 for exposing the terminal screws 31, the cover 21 is provided with guide grooves matched with the second phase interval plate 222 for guiding insertion, the number of the guide grooves is the same as that of the second phase interval plate 222, each guide groove is formed by the interval between two adjacent guide columns 217, the top edge of the cover 21 corresponding to one side of the current transformer 1 is provided with a second buckle structure 218.

[0051] The side plate on the multi-stage circuit breaker body can be matched and connected with the first buckle structure 214 when the connecting side groove 224 slides upward to the first buckle structure 214, and the top plate on the multi-stage circuit breaker body can be matched and connected with the second buckle structure, so that the shell 2 and the multi-stage circuit breaker body can be reliably connected.

[0052] The second side partition 223 of the base 22 is provided with a boss 229 which cooperates with the support 4, and the support 4 comprises a support leg 43 which abuts the bottom edge of the base 22 on the side corresponding to the current transformer 1.

[0053] The second side partition 223 of the base 22 is provided with a boss 229 which cooperates with the support 4, and the support 4 comprises a support leg 43 which abuts the bottom edge of the base 22 on the side corresponding to the current transformer 1.

[0054] The above embodiment is only one of the preferred specific embodiments of the present application, and the usual changes and replacements made by those skilled in the art within the scope of the technical solutions of the present application are all included in the protection scope of the present application.

Claims

1. A current transformer assembly comprising a toroidal current transformer, a housing for accommodating the current transformer, a number of current-carrying parts, and a terminal block connected to the current-carrying parts respectively corresponding thereto, characterized in that: The supporting member is further provided, the current-carrying component is made of rigid conductive material, and the current-carrying component is fixed in the inner hole of the current transformer together with the supporting member; at least one of the current-carrying components comprises a recess for embedding the edge of the current transformer, and the two sides of the recess can form axial limiting of the current transformer; the supporting member comprises a plurality of end faces arranged corresponding to the inner hole side wall of the current transformer, and a first groove for embedding and fixing the current-carrying component and a second groove for installing the N-phase conductor or test winding are arranged on the end faces; the first groove is provided with a limiting structure for limiting the current-carrying component at least at one end along the axial direction of the current transformer; the shell comprises an assembled cover and a base, the cover is provided with a first insertion slot for inserting the terminal block on one side corresponding to the base, the first insertion slots are separated from each other by a first phase spacing plate, the first insertion slots are provided with a first side spacing plate corresponding to one side of the current transformer, the base is provided with a second insertion slot for inserting the terminal block on one side corresponding to the cover, the second insertion slots are separated from each other by a second phase spacing plate, and the second insertion slots are provided with a second side spacing plate corresponding to one side of the current transformer; a notch for passing and supporting the terminal plate is arranged on the second side spacing plate of the base; the first insertion slot and the second insertion slot, the first phase spacing plate and the second phase spacing plate, and the first side spacing plate and the second side spacing plate can be connected together when the cover and the base are assembled; the second side spacing plate of the base is provided with a boss connected with the supporting member; the supporting member further comprises an abutting portion, a clamping portion and a supporting leg; the abutting portion and the boss form abutting limiting connection; the clamping portion and the shell form clamping connection; and the supporting leg is arranged at the bottom edge corresponding to one side of the current transformer of the base.

2. A current transformer assembly according to claim 1, characterised in that: The current-carrying component with the recess is at least two, and is symmetrically distributed along the center of the inner hole of the current transformer.

3. A current transformer assembly according to claim 1, wherein: One end of the current-carrying component is electrically fixedly connected with the terminal block, the other end of the current-carrying component has an electrically connected plate, the electrically connected plates of the other ends of the plurality of current-carrying components are arranged at the same angle, and an oval connecting hole is arranged on the electrically connected plate.

4. A current transformer assembly according to claim 3, characterised in that: One end of the current-carrying component is provided with a lead wire.

5. A current transformer assembly according to claim 1, characterized in that: The base is provided with a connecting lateral groove on both sides, the cover is provided with a first buckle structure corresponding to the connecting lateral groove, the cover is provided with a second buckle structure at the top edge corresponding to one side of the current transformer, and the base is provided with a wire outlet groove at the bottom edge corresponding to one side of the current transformer.

6. A current transformer assembly according to claim 1, characterized in that: The base is provided with a terminal port on the side opposite to the current transformer, the base is provided with a mounting hook on the side corresponding to the terminal port, the cover is provided with a clamping groove on the side opposite to the current transformer, the clamping groove is matched with the hook, at least one set of corresponding first phase spacing plate and second phase spacing plate are provided with screw mounting holes, the fixing screw is arranged in the screw mounting hole to lock and fix the cover and the base together, the cover is provided with a screw hole corresponding to the position of each terminal, the screw hole is used to expose the terminal screw, and the cover is provided with a guide groove matched with the second phase spacing plate.

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