Electronic residual current protection device and circuit breaker

Abstract

The utility model belongs to the technical field of low-voltage electric appliances, and discloses an electronic residual current protection device and a circuit breaker. The electronic residual current protection device comprises a conductive part, a short circuit protection device and a current mutual inductance part. The conducting part comprises conducting bars which are arranged in one-to-one correspondence with A, B and C phases of the circuit breaker, the conducting bars are of an integrally formed structure, the first ends of the conducting bars are electrically connected with a moving contact of the circuit breaker and are provided with short-circuit protection devices, and the second ends of the conducting bars are used for being electrically connected with wiring terminals; the current mutual inductance part comprises a zero-sequence current transformer and protection current transformers arranged in one-to-one correspondence with the conducting bars, each conducting bar penetrates through a center hole of the zero-sequence current transformer and the corresponding protection current transformer, the zero-sequence current transformer is close to the first end, and the protection current transformers are close to the second end. The electronic residual current protection device is compact in structure, the space of the circuit breaker is saved, the production efficiency of the circuit breaker is high, and the temperature rise is low.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, in particular to an electronic residual current protection device and a circuit breaker. Background Art

[0002] The overcurrent protection system and the leakage current detection system are important components of the electronic leakage circuit breaker, which are mainly composed of the protection current transformer and the zero-sequence current transformer. The protection current transformer and the zero-sequence current transformer both collect the current signal on the main circuit. When the protection current transformer detects that the current of the main circuit exceeds the set value, it will send a trip signal. After receiving the signal, the tripper will trip the circuit breaker and disconnect the main circuit current; when the zero-sequence current transformer detects that the leakage current of the main circuit exceeds the set value, it will send a trip signal. After receiving the signal, the tripper will trip the circuit breaker and disconnect the main circuit current.

[0003] In the prior art, the front end of the conductive bar in the circuit breaker is generally installed with a short-circuit protection device first, and the rear end of the conductive bar is successively penetrated with a protective current transformer and a zero-sequence current transformer and then connected to the terminal. For a circuit breaker with this installation method, if the conductive bar adopts an integrally formed structure, it is necessary to bend upward near the front end of the conductive bar to form a vertical section, which is used to install the short-circuit protection device; then bend horizontally and then bend downward to the position of the protective current transformer and then bend horizontally to penetrate the protective current transformer; then bend upward to the position of the center hole of the zero-sequence current transformer and then bend horizontally to penetrate the center hole; then bend downward and then bend horizontally to connect to the terminal. This installation arrangement requires the conductive bar to be bent at most 8 times, and the total length is longer, which in turn leads to a longer overall size of the circuit breaker.

[0004] If you want to shorten the length of the conductive bar and save space in the circuit breaker, the conductive bar of each phase is generally divided into at least two sections. The two sections are generally electrically connected by bolts. However, the existence of the conductive bar breakpoint will affect the production and assembly efficiency of the circuit breaker and easily cause the temperature rise of the circuit breaker to be too high.

[0005] Therefore, there is an urgent need to provide an electronic residual current protection device and a circuit breaker to solve the above problems. Utility Model Content

[0006] According to one aspect of the utility model, the utility model provides an electronic residual current protection device with a compact structure, which saves space for the circuit breaker, shortens the length dimension of the circuit breaker, and uses an integrally formed conductive bar, so that the production efficiency of the circuit breaker is high and the temperature rise is low.

[0007] To achieve this purpose, the utility model adopts the following technical solutions:

[0008] An electronic residual current protection device is used for a circuit breaker, and the electronic residual current protection device comprises:

[0009] The conductive part comprises a conductive bar arranged in one-to-one correspondence with the three phases A, B and C of the circuit breaker, the conductive bar is an integrally formed structure, a first end of the conductive bar is electrically connected to the moving contact of the circuit breaker, and a second end of the conductive bar is used to be electrically connected to the wiring terminal of the circuit breaker;

[0010] A short-circuit protection device, wherein the first end of each of the conductive bars is provided with the short-circuit protection device;

[0011] The current transformer part includes a zero-sequence current transformer and three protection current transformers. The protection current transformers are arranged in a one-to-one correspondence with the conductive bars. Each conductive bar is penetrated by the central hole of the zero-sequence current transformer and the corresponding protection current transformer. The zero-sequence current transformer is close to the first end of the conductive bar, and the protection current transformer is close to the second end of the conductive bar.

[0012] Optionally, the current transformer further includes a first assembly bracket, and the first assembly bracket includes:

[0013] A support body, wherein at least three mutually insulated transformer accommodating spaces are provided on the support body, and one protection current transformer is installed in each of the transformer accommodating spaces;

[0014] An insulating connecting part is arranged on the bracket body, the insulating connecting part passes through the central hole, and at least three mutually insulated conductive row accommodating spaces are arranged on the insulating connecting part, and the three conductive row portions passing through the central hole are respectively installed in the three conductive row accommodating spaces.

[0015] Optionally, at least four arranged mounting arms extend from the bracket body, and two adjacent mounting arms enclose the transformer accommodating space. Within the transformer accommodating space, two adjacent mounting arms are provided with mounting grooves extending along the length direction of the mounting arms, and the opposite ends of the protective current transformer are respectively inserted into the corresponding mounting grooves.

[0016] Optionally, on the bracket body, an insulating protective plate is provided on the side of each transformer accommodating space close to the zero-sequence current transformer and the side away from the zero-sequence current transformer, and the two insulating protective plates corresponding to the same transformer accommodating space form a transformer protection space, and the coil of the protective current transformer is placed in the transformer protection space.

[0017] Optionally, the insulating connection part is square, and two insulating partitions are protruding from at least three end faces of the insulating connection part, which are spaced apart from each other. The end face of the insulating connection part and the two insulating partitions on the end faces form a conductive row accommodating space. The portion of the conductive row passing through the center hole is clamped in the conductive row accommodating space, and all the insulating partitions are in contact with the inner wall of the center hole.

[0018] Optionally, the electronic residual current protection device also includes an electronic control unit, and a control unit accommodating space for installing the electronic control unit is provided on the top of the bracket body. On the bracket body, elastic clips are provided at the outer edges of the opposite sides of the control unit accommodating space, and the opposite ends of the electronic control unit are clamped to the corresponding elastic clips.

[0019] Optionally, the electronic residual current protection device further comprises a second assembly bracket for fixing the short-circuit protection device;

[0020] A connecting ear group corresponding to the short-circuit protection device is provided on one side of the second assembly bracket away from the zero-sequence current transformer, each connecting ear group includes two connecting ears arranged at intervals, and both ends of the connecting shaft of the short-circuit protection device are respectively connected to the two connecting ears;

[0021] A connecting column is provided on one side of the second assembly bracket close to the zero-sequence current transformer, a connecting hole is provided on the insulating connecting part, and the insulating connecting part is connected to the connecting column through the connecting hole after passing through the central hole.

[0022] Optionally, the conductive bars arranged opposite to the three phases A, B and C of the circuit breaker are defined as a first conductive bar, a second conductive bar and a third conductive bar in sequence;

[0023] On one side of the second assembly bracket close to the zero-sequence current transformer, a first conductive bar fixing space and a third conductive bar fixing space are provided on both sides of the connecting column, and parts of the first conductive bar and the third conductive bar are respectively installed in the first conductive bar fixing space and the third conductive bar fixing space, and a second conductive bar fixing space is provided at the bottom of the second assembly bracket, and part of the second conductive bar is installed in the second conductive bar fixing space.

[0024] Optionally, the conductive part further includes a conductive bar arranged opposite to the N phase of the circuit breaker, and the conductive bar is passed through the zero-sequence current transformer.

[0025] According to another aspect of the utility model, the utility model also provides a circuit breaker, comprising a base, a plurality of moving contacts arranged on the base, and an electronic residual current protection device described in any of the above technical solutions, wherein the electronic residual current protection device is installed on the base, the moving contacts are arranged in a one-to-one correspondence with the conductive bars, and the first end of the conductive bar is electrically connected to the moving contacts.

[0026] Beneficial effects of the utility model:

[0027] The utility model provides an electronic residual current protection device for a circuit breaker, comprising a conductive part, a short circuit protection device and a current mutual inductance part. The three conductive bars of the conductive part are all integrally formed structures. With such a configuration, the conductive bars will not have breakpoints, the assembly process can be simplified, the effectiveness efficiency of the electronic residual current protection device is improved, and the temperature rise is low during use, thereby improving the safety of the electronic residual current protection device.

[0028] From the first end to the second end of the conductive bar, a short-circuit protection device, a zero-sequence current transformer and a protection current transformer are sequentially arranged on the conductive bar. Since the three conductive bars are all integrally formed structures, the conductive bar needs to be bent upwards for installing the short-circuit protection device. After bending upwards, it can be directly bent horizontally to pass through the center hole of the zero-sequence current transformer, and then, depending on the height of the protection current transformer, continue to bend or not bend to pass through the protection current transformer. The part after passing through the protection current transformer can be directly connected to the terminal. With such an arrangement, the conductive bar needs to be bent at most 4 times. Compared with the installation method in the prior art in which the conductive bar first passes through the protection current transformer and then passes through the zero-sequence current transformer and is connected to the terminal, the number of bending times of the conductive bar is reduced, the length of the conductive bar is shortened, and the structure is more compact, which is conducive to saving space for the circuit breaker.

[0029] The utility model also provides a circuit breaker, comprising a base, a plurality of moving contacts and the above-mentioned electronic residual current protection device. Due to the use of the above-mentioned electronic residual current protection device, the circuit breaker has a smaller length direction, a higher production and assembly efficiency, a lower temperature rise during use, and better safety performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0031] Figure 1It is a structural schematic diagram of an electronic residual current protection device provided by an embodiment of the utility model;

[0032] Figure 2 It is a schematic diagram of the structure of the conductive bar provided by an embodiment of the utility model;

[0033] Figure 3 This is a schematic diagram of the structure of the first assembly bracket provided in the embodiment of the utility model. Figure 1 ;

[0034] Figure 4 This is a schematic diagram of the structure of the first assembly bracket provided in the embodiment of the utility model. Figure 2 ;

[0035] Figure 5 It is an assembly diagram of a first assembly bracket and a protective current transformer provided in an embodiment of the utility model;

[0036] Figure 6 It is an exploded view of the first assembly bracket and the protective current transformer provided by the embodiment of the utility model;

[0037] Figure 7 It is an assembly diagram of a conductive bar, a zero-sequence current transformer and a first assembly bracket provided in an embodiment of the utility model;

[0038] Figure 8 It is an assembly diagram of a zero-sequence current transformer and a first assembly bracket provided in an embodiment of the utility model;

[0039] Fig. 9 This is a schematic diagram of the structure of the second assembly bracket provided in the embodiment of the utility model. Figure 1 ;

[0040] Fig.10 This is a schematic diagram of the structure of the second assembly bracket provided in the embodiment of the utility model. Figure 2 .

[0041] In the figure:

[0042] 100, conductive part; 110, first conductive row; 120, second conductive row; 130, third conductive row; 140, fourth conductive row;

[0043] 200, short circuit protection device; 210, connecting shaft;

[0044] 300, current mutual inductance part; 310, zero sequence current mutual inductor; 320, protection current mutual inductor; 321, coil; 322, iron core; 330, first assembly bracket; 331, bracket body; 3311, mutual inductor accommodation space; 3312, mounting arm; 3313, mounting groove; 3314, insulation protection plate; 3315, control unit accommodation space; 3316, elastic buckle; 332, insulation connection part; 3321, conductive bar accommodation space; 3322, insulation partition; 3323, connection hole;

[0045] 400. Electronic control unit;

[0046] 500, second assembly bracket; 510, connection ear; 520, connection column; 530, first conductive bar fixing space; 540, second conductive bar fixing space; 550, third conductive bar fixing space; 560, fourth conductive bar fixing space; 570, sub-bracket; 571, protection groove. DETAILED DESCRIPTION

[0047] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0048] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0050] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0051] At present, a short-circuit protection device is installed at the front end of the conductive bar in the circuit breaker, and the rear end of the conductive bar is successively penetrated with a protective current transformer and a zero-sequence current transformer and then connected to the wiring terminal. For a circuit breaker with this installation method, if the conductive bar adopts an integrated structure, it is necessary to bend upward near the front end of the conductive bar to form a vertical section, which is used to install the short-circuit protection device; then bend horizontally and then bend downward to the position of the protective current transformer and then bend horizontally to penetrate the protective current transformer; then bend upward to the position of the center hole of the zero-sequence current transformer and then bend horizontally to penetrate the center hole; then bend downward and then bend horizontally to connect to the wiring terminal. This installation arrangement requires the conductive bar to be bent at most 8 times, and the total length is longer, which in turn leads to a longer overall size of the circuit breaker.

[0052] If you want to shorten the length of the conductive bar and save space in the circuit breaker, the conductive bar of each phase is generally divided into at least two sections. The two sections are generally electrically connected by bolts. However, the existence of the conductive bar breakpoint will affect the production and assembly efficiency of the circuit breaker and easily cause the temperature rise of the circuit breaker to be too high.

[0053] Based on the above problems, this embodiment provides an electronic residual current protection device with a compact structure, which saves space for the circuit breaker, shortens the length of the circuit breaker, and uses an integrally formed conductive bar. The production efficiency of the circuit breaker is high and the temperature rise is low.

[0054] Specifically, Figure 1 and Figure 2 As shown, the electronic residual current protection device includes a conductive part 100 , a short circuit protection device 200 and a current mutual inductance part 300 .

[0055] The conductive part 100 includes conductive bars arranged one by one corresponding to the three phases A, B, and C of the circuit breaker. The conductive bars are an integrally formed structure. The first end of the conductive bars is electrically connected to the moving contact of the circuit breaker, and the second end of the conductive bars is used to be electrically connected to the wiring terminal of the circuit breaker. For ease of understanding, the conductive bar arranged opposite to the A phase of the circuit breaker is defined as the first conductive bar 110, the conductive bar arranged opposite to the B phase of the circuit breaker is defined as the second conductive bar 120, and the conductive bar arranged opposite to the C phase of the circuit breaker is defined as the third conductive bar 130. The first conductive bar 110, the second conductive bar 120, and the third conductive bar 130 are generally arranged in sequence.

[0056] The first end of each conductive bar is provided with a short circuit protection device 200. When a short circuit fault occurs in the circuit, the short circuit protection device 200 will be activated to trip the circuit breaker to protect the circuit. Since the structure of the short circuit protection device 200 is prior art, its structure will not be described in detail.

[0057] The current transformer 300 includes a zero-sequence current transformer 310 and three protection current transformers 320. The zero-sequence current transformer 310 is used for leakage detection, and the protection current transformer 320 is used for overcurrent detection. The protection current transformers 320 are arranged in a one-to-one correspondence with the conductive bars, and each conductive bar is penetrated through the center hole of the zero-sequence current transformer 310 and the corresponding protection current transformer 320, and the zero-sequence current transformer 310 is close to the first end, and the protection current transformer 320 is close to the second end.

[0058] The conductive bar with an integrally formed structure has no breakpoints, which can simplify the assembly process, improve the production efficiency of the electronic residual current protection device, and has a low temperature rise during use, thereby improving the safety of the electronic residual current protection device.

[0059] Furthermore, in the electronic residual current transformer provided in the present embodiment, the conductive bar first passes through the zero-sequence current transformer 310 and then passes through the protective current transformer 320, which is opposite to the installation method of the zero-sequence current transformer and the protective current transformer in the prior art. With such an arrangement, the conductive bar is bent upward for installing the short-circuit protection device 200 and then can be directly bent horizontally to pass through the center hole of the zero-sequence current transformer 310, and then bent downward to the height of the protective current transformer 320 and then bent horizontally to pass through the protective current transformer 320. With such an arrangement, the conductive bar needs to be bent at most 4 times. Compared with the prior art, the number of bending times of the conductive bar is reduced, thereby shortening the length of the conductive bar, making the structure more compact, which is beneficial to saving space of the circuit breaker and shortening the length dimension of the circuit breaker.

[0060] It is worth noting that in this embodiment, since the second conductive bar 120 is located below the center hole when passing through the center hole of the zero-sequence current transformer 310, and this position is directly opposite to the protection current transformer 320, the second conductive bar 120 does not need to be bent after passing through the center hole, and the processing efficiency is relatively high.

[0061] Furthermore, if Figure 3-Figure 8 As shown, the current transformer unit 300 further includes a first assembly bracket 330 , and the first assembly bracket 330 is used to fix the zero-sequence current transformer 310 and the protection current transformer 320 .

[0062] Specifically, the first assembly bracket 330 includes a bracket body 331 and an insulating connection part 332. Among them, at least three mutually insulated transformer accommodating spaces 3311 are provided on the bracket body 331, and a protection current transformer 320 is installed in each transformer accommodating space 3311. The insulating connection part 332 is arranged on the bracket body 331, and the insulating connection part 332 is penetrated through the center hole, and at least three mutually insulated conductive bar accommodating spaces 3321 are provided on the insulating connection part 332, and the parts of the three conductive bars penetrated through the center hole are respectively installed in the three conductive bar accommodating spaces 3321. The first assembly bracket 330 has a simple structure, can fix the zero-sequence current transformer 310 and the protection current transformer 320, and can also realize the insulation between the three protection current transformers 320, as well as the insulation of the three conductive bars in the center hole, and has high working reliability.

[0063] Optionally, continue to see Figure 4-Figure 6 At least four arranged mounting arms 3312 are extended from the bracket body 331, and two adjacent mounting arms 3312 enclose a transformer accommodating space 3311. In the transformer accommodating space 3311, mounting grooves 3313 extending along the length direction of the mounting arms 3312 are provided on the two adjacent mounting arms 3312, and the opposite ends of the protective current transformer 320 are respectively inserted into the corresponding mounting grooves 3313.

[0064] When installing the protection current transformer 320, the two ends of the protection current transformer 320 are respectively aligned with the two installation grooves 3313 from the opening of the transformer accommodating space 3311, and then the protection current transformer 320 is pushed along the extension direction of the installation groove 3313. After being pushed into place, the installation of the protection current transformer 320 is completed. The structure is simple and the installation is convenient.

[0065] It can be understood that in order to achieve insulation between the protection current transformers 320, the mounting arm 3312 has insulation properties.

[0066] Optionally, in this embodiment, opposite ends of the iron core 322 of the protection current transformer 320 are inserted into corresponding mounting grooves 3313 .

[0067] Preferably, continue to see Figure 3-Figure 6On the bracket body 331, an insulating protection plate 3314 is provided on the side of each transformer accommodating space 3311 close to the zero-sequence current transformer 310 and the side away from the zero-sequence current transformer 310. The two insulating protection plates 3314 corresponding to the same transformer accommodating space 3311 form a transformer protection space, and a coil 321 of the protection current transformer 320 is placed in the transformer protection space. By setting the transformer protection space, the risk of the coil 321 contacting the zero-sequence current transformer 310 can be reduced, the working reliability is high, and the coil 321 can also be protected, which is conducive to extending the service life of the protection current transformer 320.

[0068] Further, see Figure 3 , Figure 7 and Figure 8 The insulating connecting part 332 is square, and two insulating partitions 3322 are convexly arranged at intervals on at least three end faces of the insulating connecting part 332. The end face of the insulating connecting part 332 and the two insulating partitions 3322 on the end face enclose a conductive row accommodating space 3321. The portion of the conductive row that passes through the center hole is snapped into the conductive row accommodating space 3321, and all insulating partitions 3322 are in contact with the inner peripheral wall of the center hole. The conductive row is insulated and fixed by the insulating partitions 3322, which has a simple structure, is easy to process, and is convenient to install. By making the insulating partitions 3322 all abut against the inner peripheral wall of the center hole, the zero-sequence current transformer 310 can be fixed, achieving "one thing for two uses". While ensuring that the zero-sequence current transformer 310 is reliably installed on the first assembly bracket 330, no additional structure is required, which simplifies the structure of the first assembly bracket 330.

[0069] Optionally, continue to see Figure 3 and Figure 8 , the insulating partition 3322 can also be arc-shaped, the two ends of the arc-shaped insulating partition 3322 are connected to the end face, the inner wall of the arc-shaped insulating partition 3322 and the end face of the insulating connecting part 332 form a conductive bar accommodating space 3321, and the outer wall of the arc-shaped insulating partition 3322 is attached to the inner circumferential wall of the center hole. Such a setting can fix both the conductive bar and the zero-sequence current transformer 310. Of course, the structure of the insulating connecting part 332 can also be set to other structures according to actual needs, and this application does not make specific limitations.

[0070] Further, see Figure 1 and Figure 7 The conductive part 100 further includes a conductive bar arranged opposite to the N phase of the circuit breaker, and the conductive bar is passed through the zero-sequence current transformer 310. For ease of understanding, the conductive bar is defined as a fourth conductive bar 140.

[0071] It is understandable that, according to the needs of the circuit breaker setting, the short-circuit protection device 200 may be provided on the fourth conductive bar 140, or it may not be provided. A protection current transformer 320 connected to the fourth conductive bar 140 may be provided, or it may not be provided. If the protection current transformer 320 connected to the fourth conductive bar 140 is provided, four transformer accommodating spaces 3311 need to be provided on the bracket body 331.

[0072] In this embodiment, the fourth conductive bar 140 is not provided with a short circuit protection device 200, nor is a protective current transformer 320 connected to the fourth conductive bar 140. Therefore, three current transformer accommodating spaces 3311 are provided on the bracket body 331.

[0073] Continue to see Figure 7 and Figure 8 In this embodiment, the portion of the first conductive bar 110 passing through the center hole is snapped into the conductive bar accommodating space 3321 on the right, the portion of the second conductive bar 120 passing through the center hole is snapped into the conductive bar accommodating space 3321 below, the portion of the third conductive bar 130 passing through the center hole is snapped into the conductive bar accommodating space 3321 on the left, and the portion of the fourth conductive bar 140 passing through the center hole is snapped into the conductive bar accommodating space 3321 above.

[0074] Further, see Figure 1 and Figure 3 The electronic residual current protection device further includes an electronic control unit 400. A control unit accommodating space 3315 for installing the electronic control unit 400 is provided on the top of the bracket body 331. On the bracket body 331, elastic buckles 3316 are provided at the outer edges of the opposite sides of the control unit accommodating space 3315, and the opposite ends of the electronic control unit 400 are clamped to the corresponding elastic buckles 3316. The electronic control unit 400 is fixed by the elastic buckles 3316, which ensures reliable connection, simple structure, and convenient installation and disassembly.

[0075] Optionally, a plurality of elastic buckles 3316 may be provided on the bracket body 331 at circumferential intervals on the outer edge of the control unit accommodating space 3315 , and the arrangement may be based on actual needs.

[0076] Furthermore, if Figure 1 , Figure 3 , Fig. 9 and Fig.10 As shown, the electronic residual current protection device further includes a second assembly bracket 500 , and the second assembly bracket 500 is used to fix the short-circuit protection device 200 .

[0077] Specifically, a connecting ear group corresponding to the short-circuit protection device 200 is provided on one side of the second assembly bracket 500 away from the zero-sequence current transformer 310, and each connecting ear group includes two connecting ears 510 arranged at intervals, and both ends of the connecting shaft 210 of the short-circuit protection device 200 are respectively connected to the two connecting ears 510. By providing the connecting ears 510, the risk of the connecting shaft 210 falling off can be reduced.

[0078] A connecting column 520 is provided on one side of the second assembly bracket 500 close to the zero-sequence current transformer 310, and a connecting hole 3323 is provided on the insulating connecting portion 332. The insulating connecting portion 332 is inserted through the center hole and connected to the connecting column 520 through the connecting hole 3323. Optionally, in this embodiment, the connecting hole 3323 is square, and the connecting column 520 is also square, and the connecting column 520 is inserted into the connecting hole 3323. By setting the connecting hole 3323 and the connecting column 520 to be both square, the second assembly bracket 500 can be prevented from rotating after installation.

[0079] Preferably, the connecting column 520 is hollow, which can reduce the weight of the second assembly bracket 500, thereby facilitating meeting the design requirements of lightweight circuit breaker.

[0080] The second assembly bracket 500 is fixed by connecting the insulating connecting portion 332 with the connecting column 520 , which has a simple structure and is easy to install, and can improve the structural compactness of the above-mentioned electronic residual current protection device.

[0081] Further, see Fig.10 On one side of the second assembly bracket 500 close to the zero-sequence current transformer 310, a first conductive bar fixing space 530 and a third conductive bar fixing space 550 are provided on both sides of the connecting column 520, and portions of the first conductive bar 110 and the third conductive bar 130 are respectively installed in the first conductive bar fixing space 530 and the third conductive bar fixing space 550, and a second conductive bar 120 fixing space is provided at the bottom of the second assembly bracket 500, and portions of the second conductive bar 120 are installed in the second conductive bar fixing space 540.

[0082] The first conductive bar fixing space 530 , the second conductive bar fixing space 540 and the third conductive bar fixing space 550 can realize separate fixation of the first conductive bar 110 , the second conductive bar 120 and the third conductive bar 130 , thereby making the first conductive bar 110 , the second conductive bar 120 and the third conductive bar 130 insulated from each other.

[0083] Optionally, since in this embodiment, the conductive part 100 further includes a fourth conductive bar 140 , a fourth conductive bar fixing space 560 is provided at the top of the connecting column 520 on a side of the second assembly bracket 500 close to the zero-sequence current transformer 310 .

[0084] Further, see Figure 1 and Fig. 9 Since the fourth conductive bar 140 is relatively long, in this embodiment, the electronic residual current protection device further includes a sub-bracket 570 with insulating properties. The sub-bracket 570 is detachably connected to the second assembly bracket 500 and is used to provide insulation protection for the portion of the fourth conductive bar 140 placed on the second assembly bracket 500.

[0085] Optionally, a protection groove 571 is provided on the sub-bracket 570 , and a portion of the fourth conductive bar 140 is installed in the protection groove 571 .

[0086] Optionally, the sub-bracket 570 is snap-connected to the second assembly bracket 500 .

[0087] The assembly sequence of the electronic residual current protection device provided in this embodiment is as follows:

[0088] First, the short circuit protection device 200 and the second assembly bracket 500 are installed on the first conductive bar 110 , the second conductive bar 120 , the third conductive bar 130 , and the fourth conductive bar 140 ;

[0089] Then, the first conductive bar 110 , the third conductive bar 130 , and the fourth conductive bar 140 are sequentially passed through the zero-sequence current transformer 310 ;

[0090] Then, the protection current transformer 320 is sequentially installed into the transformer accommodation space 3311 of the first assembly bracket 330;

[0091] Then, the first conductive bar 110 and the third conductive bar 130 are respectively inserted into the corresponding protection current transformer 320, and the insulating connecting portion 332 is inserted into the central hole of the zero-sequence current transformer 310 and then connected to the second assembly bracket 500;

[0092] Then install the second conductive bar 120;

[0093] Finally, the electronic control unit 400 is installed in the control unit accommodating space 3315 of the first assembly bracket 330 .

[0094] This embodiment also provides a circuit breaker, including a base, a plurality of moving contacts arranged on the base, and the above-mentioned electronic residual current protection device. Specifically, the electronic residual current protection device is installed on the base, the moving contacts are arranged in a one-to-one correspondence with the conductive bars, and the first end of the conductive bar is electrically connected to the moving contacts.

[0095] Since the circuit breaker adopts the above-mentioned electronic residual current protection device, the size in the length direction is small, the production and assembly efficiency is high, the temperature rise during use is low, and the safety performance is good.

[0096] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. An electronic residual current protection device for a circuit breaker, characterized in that: The electronic residual current protection device comprises: The conductive part (100) comprises a conductive bar arranged in one-to-one correspondence with the three phases A, B and C of the circuit breaker, the conductive bar is an integrally formed structure, a first end of the conductive bar is electrically connected to the moving contact of the circuit breaker, and a second end of the conductive bar is used to be electrically connected to the wiring terminal of the circuit breaker; A short-circuit protection device (200), wherein the first end of each of the conductive bars is provided with the short-circuit protection device (200); The current transformer part (300) comprises a zero-sequence current transformer (310) and three protection current transformers (320), wherein the protection current transformers (320) are arranged in a one-to-one correspondence with the conductive bars, each of the conductive bars is passed through a central hole of the zero-sequence current transformer (310) and the corresponding protection current transformer (320), and the zero-sequence current transformer (310) is close to a first end of the conductive bar, and the protection current transformer (320) is close to a second end of the conductive bar.

2. The electronic residual current protection device according to claim 1, characterized in that: The current mutual inductance unit (300) further comprises a first assembly bracket (330), wherein the first assembly bracket (330) comprises: A bracket body (331), wherein the bracket body (331) is provided with at least three mutually insulated transformer accommodating spaces (3311), and each of the transformer accommodating spaces (3311) is equipped with one of the protection current transformers (320); An insulating connecting portion (332) is arranged on the bracket body (331), the insulating connecting portion (332) is passed through the central hole, and at least three mutually insulated conductive row accommodating spaces (3321) are arranged on the insulating connecting portion (332), and the three conductive row portions passing through the central hole are respectively installed in the three conductive row accommodating spaces (3321).

3. The electronic residual current protection device according to claim 2, characterized in that: At least four arranged mounting arms (3312) extend from the bracket body (331), and two adjacent mounting arms (3312) enclose the transformer accommodating space (3311). In the transformer accommodating space (3311), mounting grooves (3313) extending along the length direction of the mounting arms (3312) are provided on the two adjacent mounting arms (3312), and the opposite ends of the protection current transformer (320) are respectively plugged into the corresponding mounting grooves (3313).

4. The electronic residual current protection device according to claim 3, characterized in that: On the bracket body (331), an insulating protection plate (3314) is provided on a side of each transformer accommodating space (3311) close to the zero-sequence current transformer (310) and a side away from the zero-sequence current transformer (310); the two insulating protection plates (3314) corresponding to the same transformer accommodating space (3311) enclose a transformer protection space; and the coil (321) of the protective current transformer (320) is placed in the transformer protection space.

5. The electronic residual current protection device according to claim 2, characterized in that: The insulating connecting portion (332) is square in shape, and two insulating partitions (3322) are convexly arranged at intervals on at least three end surfaces of the insulating connecting portion (332). The end surface of the insulating connecting portion (332) and the two insulating partitions (3322) on the end surface enclose the conductive row accommodating space (3321). The portion of the conductive row that passes through the central hole is snap-fitted into the conductive row accommodating space (3321), and all the insulating partitions (3322) are in contact with the inner peripheral wall of the central hole.

6. The electronic residual current protection device according to claim 2, characterized in that: The electronic residual current protection device also includes an electronic control unit (400); a control unit accommodating space (3315) for installing the electronic control unit (400) is provided on the top of the bracket body (331); elastic clips (3316) are provided on the outer edges of opposite sides of the control unit accommodating space (3315) on the bracket body (331); opposite ends of the electronic control unit (400) are snap-connected to the corresponding elastic clips (3316).

7. The electronic residual current protection device according to claim 2, characterized in that: The electronic residual current protection device further comprises a second assembly bracket (500) for fixing the short-circuit protection device (200); A connecting ear group corresponding to the short-circuit protection device (200) is provided on one side of the second assembly bracket (500) away from the zero-sequence current transformer (310), each connecting ear group comprising two connecting ears (510) arranged at intervals, and two ends of the connecting shaft (210) of the short-circuit protection device (200) are respectively connected to the two connecting ears (510); A connecting column (520) is provided on one side of the second assembly bracket (500) close to the zero-sequence current transformer (310), and a connecting hole (3323) is provided on the insulating connecting part (332). The insulating connecting part (332) is passed through the central hole and connected to the connecting column (520) through the connecting hole (3323).

8. The electronic residual current protection device according to claim 7, characterized in that: The conductive bars arranged opposite to the three phases A, B and C of the circuit breaker are defined as a first conductive bar (110), a second conductive bar (120) and a third conductive bar (130) in sequence; On one side of the second assembly bracket (500) close to the zero-sequence current transformer (310), a first conductive bar fixing space (530) and a third conductive bar fixing space (550) are provided on both sides of the connecting column (520); portions of the first conductive bar (110) and the third conductive bar (130) are respectively installed in the first conductive bar fixing space (530) and the third conductive bar fixing space (550); a second conductive bar fixing space (540) is provided at the bottom of the second assembly bracket (500); portions of the second conductive bar (120) are installed in the second conductive bar fixing space (540).

9. The electronic residual current protection device according to any one of claims 1 to 8, characterized in that: The conductive part (100) further comprises a conductive bar arranged opposite to the N phase of the circuit breaker, and the conductive bar is passed through the zero-sequence current transformer (310).

10. A circuit breaker, characterized in that It includes a base, a plurality of moving contacts arranged on the base, and the electronic residual current protection device according to any one of claims 1 to 9, wherein the electronic residual current protection device is installed on the base, the moving contacts are arranged in a one-to-one correspondence with the conductive bars, and the first end of the conductive bar is electrically connected to the moving contacts.

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