CN222441343U - Electronic residual current protection device and circuit breaker - Google Patents

Abstract

The utility model belongs to the technical field of piezoelectric devices, 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 transformer. The current transformer comprises zero sequence current transformers and protection current transformers which are arranged in one-to-one correspondence with the conductor bars, each conductor bar is arranged in a penetrating mode in a center hole of the zero sequence current transformer and the protection current transformer corresponding to the center hole, 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, saves the space of the circuit breaker, and is higher in production efficiency and lower in temperature rise.

Description

Electronic residual current protection device and circuit breaker

Technical Field

The utility model relates to the technical field of piezoelectric devices, in particular to an electronic residual current protection device and a circuit breaker.

Background

The overcurrent protection system and the leakage current detection system are important constituent units of the electronic leakage circuit breaker and mainly comprise a protection current transformer and a zero sequence current transformer. The protection current transformer and the zero sequence current transformer both collect current signals on the main loop, when the protection current transformer detects that the current of the main loop exceeds a set value, a tripping signal is sent, the tripping device trips the circuit breaker to disconnect the current of the main loop after receiving the signals, and when the zero sequence current transformer detects that the leakage current of the main loop exceeds the set value, a tripping signal is sent, the tripping device trips the circuit breaker to disconnect the current of the main loop after receiving the signals.

In the prior art, a short-circuit protection device is generally installed at the front end of a conductive bar in a circuit breaker, and the rear end of the conductive bar is sequentially penetrated with a protection current transformer and a zero sequence current transformer and then connected with a wiring terminal. For the circuit breaker with the installation mode, if the conducting bar adopts an integrally formed structure, a vertical section is required to be formed by bending upwards at the front end close to the conducting bar, the vertical section is used for installing a short-circuit protection device, then the vertical section is bent downwards to the position of a protection current transformer after being bent horizontally, the protection current transformer is penetrated through the horizontal bending after being bent horizontally, then the vertical section is bent upwards to the position of a central hole of the zero sequence current transformer after being bent horizontally, and then the vertical section is bent downwards and is used for being connected with a connecting terminal after being bent horizontally. This mounting arrangement makes the conductor bar at most require bending 8 times, and the overall length is longer, thereby resulting in a longer overall size of the circuit breaker.

If the length of the conductor bars is required to be shortened, the space of the circuit breaker is saved, the conductor bars of each phase are generally divided into at least two sections, the two sections are generally electrically connected through bolts, but the production assembly efficiency of the circuit breaker can be affected by the existence of the break points of the conductor bars, and the temperature rise of the circuit breaker is easy to be higher.

Therefore, it is needed to provide an electronic residual current protection device and a circuit breaker to solve the above problems.

Disclosure of utility model

According to one aspect of the utility model, the electronic residual current protection device is compact in structure, space of the circuit breaker is saved, the length dimension of the circuit breaker is shortened, the integrated conductive bars are used, the production efficiency of the circuit breaker is high, and the temperature rise is low.

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

an electronic residual current protection device for a circuit breaker, the electronic residual current protection device comprising:

The conducting part comprises conducting bars which are arranged in one-to-one correspondence with A, B, C three phases of the circuit breaker, the conducting bars are of an integrated structure, a first end of each conducting bar is electrically connected with a moving contact of the circuit breaker, and a second end of each conducting bar is electrically connected with a wiring terminal of the circuit breaker;

the first end of each conducting bar is provided with the short-circuit protection device;

The current transformer comprises a zero sequence current transformer and three protection current transformers, the protection current transformers are arranged in one-to-one correspondence with the conducting bars, each conducting bar is arranged in a penetrating mode in the 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 of the conducting bar, and the protection current transformer is close to the second end of the conducting bar.

Optionally, the current transformer further includes a first assembly bracket, the first assembly bracket includes:

the protective current transformer comprises a bracket main body, wherein at least three mutual-insulation transformer accommodating spaces are formed in the bracket main body, and each mutual-inductor accommodating space is internally provided with one protective current transformer;

The insulating connecting part is arranged on the bracket main body, the insulating connecting part penetrates through the central hole, and at least three mutually-insulated conducting bar accommodating spaces are arranged on the insulating connecting part, and the parts, penetrating through the central hole, of the conducting bars are respectively arranged in the three conducting bar accommodating spaces.

Optionally, the support main part is last to extend has four at least installation arms of arranging the setting, and two adjacent installation arms enclose into the mutual-inductor accommodation space in the mutual-inductor accommodation space, all be equipped with on two adjacent installation arms and follow the mounting groove that the length direction of installation arm extends, protection current transformer's opposite both ends peg graft respectively in rather than corresponding the mounting groove.

Optionally, on the support main body, an insulating protection plate is arranged on one side, close to the zero sequence current transformer, of each transformer accommodating space and one side, far away from the zero sequence current transformer, of each transformer accommodating space, two insulating protection plates corresponding to the same transformer accommodating space enclose a transformer protection space, and a coil for protecting the current transformer is arranged in the transformer protection space.

Optionally, the insulating connecting portion is square, all protruding two insulating barrier that are equipped with the interval setting on at least three terminal surface of insulating connecting portion, the terminal surface of insulating connecting portion with two on the terminal surface insulating barrier encloses into the busbar accommodation space, the busbar wear to locate the part joint in of centre bore in the busbar accommodation space, and all insulating barrier all butt in the inner peripheral wall of centre bore.

Optionally, the electronic residual current protection device further comprises an electronic control unit, a control unit accommodating space for installing the electronic control unit is formed in the top of the support main body, elastic buckles are arranged on the outer edges of two opposite sides of the control unit accommodating space on the support main body, and two opposite ends of the electronic control unit are clamped with the elastic buckles corresponding to the electronic control unit accommodating space.

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

One side of the second assembly bracket, which is far away from the zero sequence current transformer, is provided with connecting lug groups corresponding to the short-circuit protection devices one by one, each connecting lug group comprises two connecting lugs arranged at intervals, and two ends of a connecting shaft of the short-circuit protection device are respectively connected with the two connecting lugs;

The second assembly bracket is provided with a connecting column on one side close to the zero sequence current transformer, the insulating connecting part is provided with a connecting hole, and the insulating connecting part is arranged in the central hole in a penetrating way and then is connected with the connecting column through the connecting hole.

Optionally, defining a conductive bar opposite to A, B, C three phases of the circuit breaker as a first conductive bar, a second conductive bar and a third conductive bar in sequence;

The second assembly bracket is close to one side of the zero sequence current transformer, a first conducting bar fixing space and a third conducting bar fixing space are formed in two sides of the connecting column, parts of the first conducting bar and the third conducting bar are respectively installed in the first conducting bar fixing space and the third conducting bar fixing space, a second conducting bar fixing space is formed in the bottom of the second assembly bracket, and parts of the second conducting bar are installed in the second conducting bar fixing space.

Optionally, the conductive part further comprises a conductive bar opposite to the N phase of the breaker, and the conductive bar is arranged through the zero sequence current transformer.

According to another aspect of the present utility model, the circuit breaker further includes a base, a plurality of moving contacts disposed on the base, and the electronic residual current protection device according to any one of the above technical solutions, wherein the electronic residual current protection device is mounted on the base, the moving contacts are disposed in one-to-one correspondence with the conductive bars, and the first ends of the conductive bars are electrically connected with the moving contacts.

The utility model has the beneficial effects that:

The utility model provides an electronic residual current protection device which is used for a circuit breaker and comprises a conductive part, a short-circuit protection device and a current transformer part. The three conducting bars of the conducting part are all of an integrated structure, so that the conducting bars are arranged, break points can not appear, the assembly process can be simplified, the effective efficiency of the electronic residual current protection device is improved, the temperature rise in the use process is lower, and the safety of the electronic residual current protection device is improved.

The first end to the second end of conducting bar is equipped with short-circuit protection device, zero sequence current transformer and protection current transformer on the conducting bar in proper order, because three conducting bar is integrated into one piece structure, the conducting bar need upwards bend and be used for installing short-circuit protection device, can directly the horizontal centre bore of passing zero sequence current transformer after upwards bending, then according to the height of protection current transformer, continue bending or not bend in order to pass protection current transformer, the part after passing protection current transformer can directly link to each other with binding post, so set up, the conducting bar needs to bend 4 times at most, with the prior art in the conducting bar pass protection current transformer earlier, compare with the mounting means that link to each other with binding post after passing zero sequence current transformer again, the bending number of times of conducting bar reduces, the length of conducting bar has been shortened, and then the structure is compacter, be favorable to saving the space of circuit breaker.

The utility model also provides a circuit breaker, which comprises a base, a plurality of moving contacts and the electronic residual current protection device. The electronic residual current protection device is adopted in the circuit breaker, so that the size of the circuit breaker in the length direction is smaller, the production and assembly efficiency is higher, the temperature rise is lower during use, and the safety performance is better.

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 diagram of an electronic residual current protection device according to an embodiment of the present utility model;

Fig. 2 is a schematic structural diagram of a conductive bar according to an embodiment of the present utility model;

Fig. 3 is a schematic structural view of a first mounting bracket according to an embodiment of the present utility model;

fig. 4 is a schematic structural diagram of a first mounting bracket according to an embodiment of the present utility model;

Fig. 5 is an assembly diagram of a first assembly bracket and a protection current transformer according to an embodiment of the present utility model;

fig. 6 is an exploded view of a first mounting bracket and a protection current transformer provided by an embodiment of the present utility model;

Fig. 7 is an assembly diagram of a conductive strip, a zero sequence current transformer and a first assembly bracket provided by an embodiment of the utility model;

fig. 8 is an assembly diagram of a zero sequence current transformer and a first assembly bracket provided by an embodiment of the utility model;

FIG. 9 is a schematic diagram of a second mounting bracket according to an embodiment of the present utility model;

fig. 10 is a schematic structural diagram of a second mounting bracket according to an embodiment of the present utility model.

In the figure:

100. The conductive part, 110, the first conductive row, 120, the second conductive row, 130, the third conductive row, 140, the fourth conductive row;

200. 210, connecting shaft;

300. Current transformer part 310, zero sequence current transformer part 320, protection current transformer part 321, coil part 322, iron core 330, first assembly bracket 331, bracket main body 3311, transformer accommodation space 3312, installation arm 3313, installation groove 3314, insulation protection plate 3315, control unit accommodation space 3316, elastic buckle 332, insulation connection part 3321, conductive row accommodation space 3322, insulation baffle plate 3323, connection hole;

400. An electronic control unit;

500. The second assembly bracket, 510, the connecting lug, 520, the connecting column, 530, the first conductive row fixing space, 540, the second conductive row fixing space, 550, the third conductive row fixing space, 560, the fourth conductive row fixing space, 570, the branch frame, 571 and the protection slot.

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 or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may, for example, be fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, directly connected, indirectly connected through an intervening medium, or in communication between two elements or in an interaction relationship between 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.

At present, a short-circuit protection device is arranged at the front end of a conducting bar in the circuit breaker, and the rear end of the conducting bar is connected with a wiring terminal after a protection current transformer and a zero sequence current transformer are sequentially arranged in a penetrating manner. For the circuit breaker with the installation mode, if the conducting bar adopts an integrally formed structure, a vertical section is required to be formed by bending upwards at the front end close to the conducting bar, the vertical section is used for installing a short-circuit protection device, then the vertical section is bent downwards to the position of a protection current transformer after being bent horizontally, the protection current transformer is penetrated through the horizontal bending after being bent horizontally, then the vertical section is bent upwards to the position of a central hole of the zero sequence current transformer after being bent horizontally, and then the vertical section is bent downwards and is used for being connected with a connecting terminal after being bent horizontally. This mounting arrangement makes the conductor bars at most require bending 8 times, and the overall length is longer, resulting in a longer overall size of the circuit breaker.

If the length of the conductor bars is required to be shortened, the space of the circuit breaker is saved, the conductor bars of each phase are generally divided into at least two sections, the two sections are generally electrically connected through bolts, but the production assembly efficiency of the circuit breaker can be affected by the existence of the break points of the conductor bars, and the temperature rise of the circuit breaker is easy to be higher.

Based on the above-mentioned problem, this embodiment provides an electronic residual current protection device, compact structure has saved the space of circuit breaker, has shortened circuit breaker length direction's size to use integrated into one piece's conducting bar, the production efficiency of circuit breaker is higher, and the temperature rise is lower.

Specifically, as shown in fig. 1 and 2, the electronic residual current protection device includes a conductive part 100, a short circuit protection device 200, and a current transformer 300.

The conductive part 100 comprises conductive bars which are arranged in one-to-one correspondence with A, B, C three phases of the circuit breaker, the conductive bars are of an integrated structure, a first end of each conductive bar is electrically connected with a moving contact of the circuit breaker, and a second end of each conductive bar is electrically connected with a wiring terminal of the circuit breaker. For ease of understanding, the first conductor 110 is defined as the conductor disposed opposite to the a-phase of the circuit breaker, the second conductor 120 is defined as the conductor disposed opposite to the B-phase of the circuit breaker, and the third conductor 130 is defined as the conductor disposed opposite to the C-phase of the circuit breaker. The first conductive strip 110, the second conductive strip 120, and the third conductive strip 130 are generally arranged in sequence.

The first end of each conductive bar is provided with a short-circuit protection device 200, and when a short-circuit fault occurs in the circuit, the short-circuit protection device 200 acts to trip the circuit breaker so as to protect the circuit. Since the structure of the short-circuit protection device 200 is the prior art, the detailed description thereof will not be repeated.

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 one-to-one correspondence with the conducting bars, each conducting bar penetrates through the center hole of the zero sequence current transformer 310 and the corresponding protection current transformer 320, the zero sequence current transformer 310 is close to the first end, and the protection current transformer 320 is close to the second end.

Adopt the conducting strip of integrated into one piece structure for the breakpoint can not appear in the conducting strip, can simplify the assembly process, has improved this electronic type residual current protection device's production efficiency, and the temperature rise is lower in the use, has improved this electronic type residual current protection device's security.

In addition, the electronic residual current transformer provided in this embodiment, the conducting bar passes through the zero sequence current transformer 310 first and then passes through the protection current transformer 320, and is opposite to the installation mode of the zero sequence current transformer and the protection current transformer in the prior art, so that the arrangement is that the conducting bar is bent upwards to be used for installing the short-circuit protection device 200, then can be directly bent horizontally to pass through the central hole of the zero sequence current transformer 310, then is bent downwards to the height of the protection current transformer 320, and then is bent horizontally to pass through the protection current transformer 320, so that the arrangement is that the conducting bar needs to be bent for 4 times at most.

It should be noted that, in the present embodiment, since the second conductive strip 120 is located below the center hole of the zero sequence current transformer 310 when penetrating the center hole, and the position is opposite to the protection current transformer 320, the second conductive strip 120 does not need to be bent after penetrating the center hole, and the processing efficiency is high.

Further, as shown in fig. 3 to 8, the current transformer 300 further includes a first assembly bracket 330, and the first assembly bracket 330 is used for fixing the zero sequence current transformer 310 and protecting the current transformer 320.

Specifically, the first fitting bracket 330 includes a bracket main body 331 and an insulating connecting portion 332. Wherein, the bracket main body 331 is provided with at least three mutual insulated transformer accommodating spaces 3311, and each transformer accommodating space 3311 is internally provided with a protection current transformer 320. The insulating connecting portion 332 is disposed on the support main 331, the insulating connecting portion 332 penetrates through the central hole, and at least three conductive strip accommodating spaces 3321 insulated from each other are disposed on the insulating connecting portion 332, and portions of the three conductive strips penetrating through the central hole are respectively mounted in the three conductive strip accommodating spaces 3321. The first assembly bracket 330 is simple in structure, can fix the zero sequence current transformer 310 and the protection current transformer 320, can realize insulation among three protection current transformers 320, and insulation of three conductive bars in a central hole, and is high in working reliability.

Optionally, with continued reference to fig. 4-6, at least four mounting arms 3312 arranged in an aligned manner extend on the bracket main body 331, two adjacent mounting arms 3312 enclose a transformer accommodating space 3311, mounting slots 3313 extending along the length direction of the mounting arms 3312 are respectively provided on two adjacent mounting arms 3312 in the transformer accommodating space 3311, and opposite ends of the protection current transformer 320 are respectively inserted into the corresponding mounting slots 3313.

When the protection current transformer 320 is installed, two ends of the protection current transformer 320 are respectively opposite to the two installation grooves 3313 from the opening of the transformer accommodating space 3311, then the protection current transformer 320 is pushed along the extending direction of the installation grooves 3313, and the installation of the protection current transformer 320 can be completed after the protection current transformer 320 is pushed in place, so that the protection current transformer is simple in structure and convenient to install.

It will be appreciated that the mounting arm 3312 has insulating properties in order to provide insulation between the protection current transformers 320.

Alternatively, in the present embodiment, opposite ends of the core 322 of the protection current transformer 320 are inserted into the corresponding mounting slots 3313.

Preferably, with continued reference to fig. 3-6, on the bracket main body 331, an insulation protection plate 3314 is disposed on a side of each transformer accommodation space 3311 close to the zero sequence current transformer 310 and a side of each transformer accommodation space far away from the zero sequence current transformer 310, two insulation protection plates 3314 corresponding to the same transformer accommodation space 3311 enclose a transformer protection space, and one coil 321 for protecting the current transformer 320 is disposed in the transformer protection space. Through setting up mutual-inductor protection space, can reduce the risk of coil 321 and zero sequence current transformer 310 contact, operational reliability is higher, also can protect coil 321 simultaneously, is favorable to prolonging the life of protection current transformer 320.

Further, with continued reference to fig. 3, 7 and 8, the insulating connecting portion 332 is square, at least three end faces of the insulating connecting portion 332 are each provided with two insulating partition plates 3322 disposed at intervals in a protruding manner, the end face of the insulating connecting portion 332 and the two insulating partition plates 3322 on the end face enclose a conductive bar accommodating space 3321, a portion of the conductive bar penetrating through the central hole is clamped in the conductive bar accommodating space 3321, and all the insulating partition plates 3322 are all abutted against the inner peripheral wall of the central hole. The insulating partition 3322 is used for insulating the conductive bars and fixing the conductive bars, so that the structure is simple, the processing is convenient, and the conductive bars are convenient to install. Through making insulating spacer 3322 all butt in the inner peripheral wall of centre bore, can fix zero sequence current transformer 310, realize "one thing dual-purpose", when guaranteeing that zero sequence current transformer 310 reliably installs on first assembly support 330, need not additionally to set up the structure, simplified the structure of first assembly support 330.

Optionally, with continued reference to fig. 3 and 8, the insulating partition 3322 may also be in an arc shape, two ends of the arc-shaped insulating partition 3322 are connected with the end surfaces, the inner wall of the arc-shaped insulating partition 3322 and the end surfaces of the insulating connecting portion 332 enclose a conductive row accommodating space 3321, and the outer wall of the arc-shaped insulating partition 3322 is attached to the inner peripheral wall of the central hole. So configured, both the conductor bars and the zero sequence current transformer 310 can be fixed. Of course, the structure of the insulating connection portion 332 may be other, and may be set according to actual needs, and the present application is not limited thereto.

Further, with continued reference to fig. 1 and 7, the conductive portion 100 further includes a conductive strip disposed opposite the N-phase of the circuit breaker, the conductive strip passing through the zero sequence current transformer 310. For ease of understanding, the conductive row is defined as a fourth conductive row 140.

It is understood that the short-circuit protection device 200 may be disposed on the fourth conductive bar 140 or the short-circuit protection device 200 may not be disposed according to the requirement of the circuit breaker. The protection current transformer 320 connected to the fourth conductive bar 140 may be further provided, or may not be provided, and if the protection current transformer 320 connected to the fourth conductive bar 140 is provided, four transformer accommodating spaces 3311 are required to be provided on the bracket main body 331.

In this embodiment, the short-circuit protection device 200 is not disposed on the fourth conductive bar 140, and the protection current transformer 320 connected to the fourth conductive bar 140 is not disposed. Therefore, three transformer receiving spaces 3311 are provided on the bracket body 331.

With continued reference to fig. 7 and 8, in the present embodiment, a portion of the first conductive bar 110 passing through the central hole is clamped to the right conductive bar accommodating space 3321, a portion of the second conductive bar 120 passing through the central hole is clamped to the lower conductive bar accommodating space 3321, a portion of the third conductive bar 130 passing through the central hole is clamped to the left conductive bar accommodating space 3321, and a portion of the fourth conductive bar 140 passing through the central hole is clamped to the upper conductive bar accommodating space 3321.

Further, with continued reference to fig. 1 and 3, the above-mentioned electronic residual current protection device further includes an electronic control unit 400, and a control unit accommodating space 3315 for installing the electronic control unit 400 is provided at the top of the bracket main body 331. On the bracket main body 331, elastic buckles 3316 are respectively provided at outer edges of opposite sides of the control unit accommodating space 3315, and opposite ends of the electronic control unit 400 are clamped to the corresponding elastic buckles 3316. The electronic control unit 400 is fixed through the elastic buckle 3316, so that the connection is ensured to be reliable, and meanwhile, the structure is simple, and the installation and the disassembly are convenient.

Alternatively, a plurality of elastic buckles 3316 may be circumferentially arranged on the outer edge of the control unit accommodating space 3315 on the bracket main body 331 at intervals, and may be arranged according to actual needs.

Further, as shown in fig. 1, 3, 9 and 10, the above-mentioned electronic residual current protection device further includes a second mounting bracket 500, and the second mounting bracket 500 is used for fixing the short-circuit protection device 200.

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

The second assembly bracket 500 is provided with a connecting column 520 at one side close to the zero sequence current transformer 310, the insulating connecting part 332 is provided with a connecting hole 3323, and the insulating connecting part 332 is connected with the connecting column 520 through the connecting hole 3323 after penetrating through the central hole. Alternatively, in the present embodiment, the connection hole 3323 is square, the connection post 520 is also square, and the connection post 520 is inserted into the connection hole 3323. By providing the connection hole 3323 and the connection post 520 as square shapes, the second mounting bracket 500 can be prevented from rotating after being mounted.

Preferably, the connecting post 520 is hollow, so that the weight of the second assembly bracket 500 can be reduced, and further the lightweight design requirement of the circuit breaker can be met.

The second assembly bracket 500 is fixed through the connection of the insulating connection portion 332 and the connection post 520, has a simple structure, is convenient to install, and can improve the structural compactness of the electronic residual current protection device.

Further, with continued reference to fig. 10, on one side of the second assembly bracket 500 near 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 connection post 520, portions of the first conductive bar 110 and the third conductive bar 130 are respectively mounted in the first conductive bar fixing space 530 and the third conductive bar fixing space 550, 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 mounted in the second conductive bar fixing space 540.

The first, second and third conductive bars 110, 120 and 130 can be separately fixed by the first, second and third conductive bar fixing spaces 530, 540 and 550, thereby enabling the first, second and third conductive bars 110, 120 and 130 to be insulated from each other.

Optionally, since in the present embodiment, the conductive part 100 further includes the fourth conductive bar 140, a fourth conductive bar fixing space 560 is provided at the top of the connection post 520 at one side of the second assembly bracket 500 near the zero sequence current transformer 310.

Further, with continued reference to fig. 1 and 9, since the fourth conductive strip 140 is long, in this embodiment, the electronic residual current protection device further includes a branching frame 570 having insulation properties, and the branching frame 570 is detachably connected to the second mounting bracket 500 for insulating and protecting a portion of the fourth conductive strip 140 placed on the second mounting bracket 500.

Optionally, the branch frame 570 is provided with a protection slot 571, and a portion of the fourth conductive strip 140 is installed in the protection slot 571.

Optionally, the branch frame 570 is clamped to the second mounting bracket 500.

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

Firstly, 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;

Then the first conductor 110, the third conductor 130 and the fourth conductor 140 are sequentially passed through the zero sequence current transformer 310;

Then, the protection current transformer 320 is sequentially installed in the transformer accommodating space 3311 of the first assembly bracket 330;

Then, the first conducting bar 110 and the third conducting bar 130 are respectively penetrated through the corresponding protection current transformer 320, and the insulating connecting part 332 is inserted into the central hole of the zero sequence current transformer 310 and then connected with the second assembly bracket 500;

and then installing the second conductive bar 120;

Finally, the electronic control unit 400 is mounted in the control unit receiving space 3315 of the first mounting bracket 330.

The embodiment also provides a circuit breaker, which comprises a base, a plurality of moving contacts arranged on the base, and the electronic residual current protection device. Specifically, the electronic residual current protection device is arranged on the base, the movable contacts and the conductive bars are arranged in one-to-one correspondence, and the first ends of the conductive bars are electrically connected with the movable contacts.

The electronic residual current protection device is adopted in the circuit breaker, so that the size of the circuit breaker in the length direction is smaller, the production and assembly efficiency is higher, the temperature rise is lower during use, and the safety performance is better.

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. Electronic residual current protection device for circuit breaker, its characterized in that, electronic residual current protection device includes:

The conducting part (100) comprises conducting bars which are arranged in one-to-one correspondence with A, B, C three phases of the circuit breaker, the conducting bars are of an integrated structure, a first end of each conducting bar is electrically connected with a moving contact of the circuit breaker, and a second end of each conducting bar is electrically connected with a wiring terminal of the circuit breaker;

A short-circuit protection device (200), wherein the first end of each conducting bar 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 one-to-one correspondence with the conducting bars, each conducting bar is arranged in the center hole of the zero sequence current transformer (310) in a penetrating mode and the corresponding protection current transformer (320), the zero sequence current transformer (310) is close to the first end of the conducting bar, and the protection current transformer (320) is close to the second end of the conducting bar.

2. The electronic residual current protection device according to claim 1, wherein the current transformer (300) further comprises a first mounting bracket (330), the first mounting bracket (330) comprising:

The protective current transformer comprises a bracket main body (331), wherein at least three mutual-insulated transformer accommodating spaces (3311) are formed in the bracket main body (331), and each transformer accommodating space (3311) is internally provided with one protective current transformer (320);

The insulating connecting part (332) is arranged on the support main body (331), the insulating connecting part (332) penetrates through the central hole, at least three mutually-insulated conducting bar accommodating spaces (3321) are formed in the insulating connecting part (332), and the parts, penetrating through the central hole, of the conducting bars are respectively arranged in the three conducting bar accommodating spaces (3321).

3. The electronic residual current protection device according to claim 2, wherein at least four mounting arms (3312) arranged in an array extend on the bracket main body (331), two adjacent mounting arms (3312) enclose the transformer accommodating space (3311), mounting slots (3313) extending along the length direction of the mounting arms (3312) are respectively arranged on two adjacent mounting arms (3312) in the transformer accommodating space (3311), and two opposite ends of the protection current transformer (320) are respectively inserted into the corresponding mounting slots (3313).

4. An electronic residual current protection device according to claim 3, characterized in that on the support main body (331), an insulating protection plate (3314) is arranged on one side of each transformer accommodating space (3311) close to the zero sequence current transformer (310) and one side far away from the zero sequence current transformer (310), two insulating protection plates (3314) corresponding to the same transformer accommodating space (3311) enclose a transformer protection space, and a coil (321) protecting the current transformer (320) is arranged in the transformer protection space.

5. The electronic residual current protection device according to claim 2, wherein the insulating connecting portion (332) is square, two insulating spacers (3322) arranged at intervals are protruding on at least three end faces of the insulating connecting portion (332), the end face of the insulating connecting portion (332) and the two insulating spacers (3322) on the end face enclose a conducting bar accommodating space (3321), a portion of the conducting bar penetrating through the central hole is clamped in the conducting bar accommodating space (3321), and all the insulating spacers (3322) are abutted against the inner peripheral wall of the central hole.

6. The electronic residual current protection device according to claim 2, further comprising an electronic control unit (400), wherein a control unit accommodating space (3315) for installing the electronic control unit (400) is provided at the top of the bracket main body (331), elastic buckles (3316) are provided on the bracket main body (331) at the outer edges of the two opposite sides of the control unit accommodating space (3315), and the two opposite ends of the electronic control unit (400) are clamped to the elastic buckles (3316) corresponding thereto.

7. The electronic residual current protection device according to claim 2, characterized in that it further comprises a second mounting bracket (500) for fixing the short-circuit protection device (200);

One side of the second assembly bracket (500) far away from the zero sequence current transformer (310) is provided with connecting lug groups corresponding to the short-circuit protection devices (200) one by one, each connecting lug group comprises two connecting lugs (510) arranged at intervals, and two ends of a connecting shaft (210) of the short-circuit protection devices (200) are respectively connected with the two connecting lugs (510);

One side of the second assembly bracket (500) close to the zero sequence current transformer (310) is provided with a connecting column (520), the insulating connecting part (332) is provided with a connecting hole (3323), and the insulating connecting part (332) is connected with the connecting column (520) through the connecting hole (3323) after penetrating through the central hole.

8. The electronic residual current protection device according to claim 7, wherein the conductor bars defined opposite to A, B, C three phases of the circuit breaker are a first conductor bar (110), a second conductor bar (120) and a third conductor bar (130) in sequence;

One side of the second assembly bracket (500) close to the zero sequence current transformer (310), a first conducting bar fixing space (530) and a third conducting bar fixing space (550) are arranged on two sides of the connecting column (520), parts of the first conducting bar (110) and the third conducting bar (130) are respectively installed in the first conducting bar fixing space (530) and the third conducting bar fixing space (550), a second conducting bar fixing space (540) is arranged at the bottom of the second assembly bracket (500), and parts of the second conducting bar (120) are installed in the second conducting bar fixing space (540).

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

10. The circuit breaker is characterized by comprising a base, a plurality of moving contacts arranged on the base and the electronic residual current protection device according to any one of claims 1-9, wherein the electronic residual current protection device is arranged on the base, the moving contacts are arranged in one-to-one correspondence with the conducting bars, and first ends of the conducting bars are electrically connected with the moving contacts.