An electronic residual current operated circuit breaker

Abstract

An electronic residual current operated circuit breaker includes a housing, a plurality of protective poles and a neutral pole. A circuit board for collecting and processing the current signal of the main circuit of the circuit breaker and driving the circuit breaker to operate according to the current signal is arranged in the housing. The circuit board includes a signal processing circuit, a tripping circuit and a power supply circuit. After the signal processing circuit determines that there is a residual current, the tripping circuit is driven to operate. The tripping circuit drives the operating mechanism of the circuit breaker to operate so that the circuit breaker trips and cuts off the power. The circuit board includes an electrically connected first circuit board and a second circuit board. The first circuit board is arranged in the protective pole and the neutral pole along the width direction of the housing, and the second circuit board is arranged in the neutral pole. The signal processing circuit and the tripping circuit are arranged on the second circuit board. The first circuit board of the present invention is electrically connected to the second circuit board and is arranged separately. Such a structure can reduce the space occupied by the wiring of the circuit board, shorten the length of the wire, and improve the working performance of the circuit board.

Description

Technical Field

[0001] The invention relates to a low-voltage power distribution system, in particular to an electronic residual current operated circuit breaker. Background Art

[0002] In the low-voltage power distribution terminal system, residual current operated protective circuit breakers with overcurrent protection are used to protect people from indirect contact, to protect buildings and line equipment for similar purposes from overcurrent, and to provide protection against fire hazards caused by continuous ground fault current due to non-operation of the overcurrent protection device.

[0003] However, at present, residual current operated protection circuit breakers with a frame current rating of 63A, a pole number of 3P+N, and an operating function related to the power supply voltage usually adopt an assembled structure, so that the overall width of the circuit breaker can reach 6.5 modules, of which the width of 1 module is 18mm. Such a structure makes the volume of the circuit breaker too large and occupies too much space in the terminal distribution box. Summary of the invention

[0004] The object of the present invention is to overcome the defects of the prior art and provide an electronic residual current operated circuit breaker with a compact structure and small occupied space.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] An electronic residual current operated circuit breaker comprises a shell and a plurality of protective poles and a neutral pole arranged inside the shell. A circuit board for collecting and processing a current signal of a main line of the circuit breaker and driving the circuit breaker to operate according to the current signal is arranged inside the shell. The circuit board comprises a signal processing circuit, a tripping circuit and a power supply circuit for supplying power to both. The signal processing circuit determines whether there is a residual current on the main line of the circuit breaker according to the collected current signal, and drives the tripping circuit to operate after the signal processing circuit determines that there is a residual current. The tripping circuit drives the operating mechanism of the circuit breaker to operate so that the circuit breaker trips and cuts off the power. The circuit board comprises an electrically connected first circuit board and a second circuit board. The first circuit board is arranged in the protective pole and the neutral pole along the width direction of the shell, and the second circuit board is arranged in the neutral pole. The signal processing circuit and the tripping circuit are arranged on the second circuit board.

[0007] Furthermore, the power supply circuit includes a surge absorption circuit, a rectifier circuit, a filter circuit and a step-down circuit which are connected in sequence. The surge absorption circuit and the rectifier circuit are arranged on the first circuit board, and at least the filter circuit and the step-down circuit are arranged on the second circuit board.

[0008] Further, one end of the surge absorption circuit arranged on the first circuit board is connected to each phase line of each protection electrode, and the other end of the surge absorption circuit is connected to one end of the rectifier circuit on the first circuit board;

[0009] A surge absorption circuit and a rectifier circuit are also provided on the second circuit board. One end of the surge absorption circuit provided on the second circuit is connected to the N-phase circuit of the neutral pole, and the other end of the surge absorption circuit is connected to one end of the rectifier circuit provided on the second circuit board. The other ends of the rectifier circuits on the first circuit board and the second circuit board are both connected to one end of the filter circuit provided on the second circuit board, and the other end of the filter circuit is connected to one end of the step-down circuit. The other end of the step-down circuit is connected to the signal processing circuit and the tripping circuit as the output end of the power supply circuit.

[0010] Furthermore, the number of the protection electrodes is three, namely, A-phase protection electrode, B-phase protection electrode and C-phase protection electrode, and a first varistor, a second varistor and a third varistor corresponding to the A-phase protection electrode, the B-phase protection electrode and the C-phase protection electrode are arranged on the first circuit board; a wiring pad is arranged on the first circuit board, and the wiring pad is electrically connected to the A-phase protection electrode, the B-phase protection electrode and the C-phase protection electrode respectively through a wire; and diodes corresponding to the A-phase protection electrode, the B-phase protection electrode and the C-phase protection electrode are also arranged on the first circuit board.

[0011] Furthermore, the first varistor, the second varistor and the third varistor are all located on the side of the first circuit board facing away from the outer casing, and three mounting portions are extended outward from one side edge of the first circuit board, and an avoidance gap is formed between two adjacent mounting portions. The mounting portions and the avoidance gap make one side of the first circuit board present a comb-like structure, and each mounting portion corresponds to the A-phase protection electrode, the B-phase protection electrode and the C-phase protection electrode respectively, and diodes are arranged on the front and back sides of each mounting portion.

[0012] Further, the neutral pole includes an N-phase housing, a pair of wiring terminals are arranged in the N-phase housing, the wiring terminals are respectively arranged on the left and right sides of the N-phase housing as the N-phase lower terminal and the N-phase upper terminal, an N-phase handle, an N-phase operating mechanism and an N-phase contact mechanism are arranged between the N-phase upper terminal and the N-phase lower terminal, the N-phase handle is linked with the N-phase operating mechanism and is arranged at the upper part of the N-phase housing, the N-phase moving contact of the N-phase contact mechanism is connected to the lower part of the N-phase operating mechanism, the N-phase static contact of the N-phase contact mechanism is arranged at the middle and lower part of the N-phase housing and cooperates with the N-phase moving contact, a residual current tripping mechanism and a second circuit board are also arranged in the N-phase housing, the residual current tripping mechanism is arranged in the middle part of the N-phase housing and is located between the N-phase operating mechanism and the N-phase lower terminal, the second circuit board is stacked in the lower part of the N-phase housing along the length direction of the N-phase housing and is located between the N-phase static contact and the N-phase lower terminal, and the second circuit board is connected to the N-phase line of the circuit breaker through a conductive wire to realize N-phase power supply.

[0013] Furthermore, a test circuit is also provided in the neutral pole, the test circuit includes a test button and a test device triggered by the test button, the test device includes a test elastic member and a test wire, the test elastic member is an elastic conductive material, one end of the test elastic member is connected to the circuit of any protective pole of the circuit breaker through a test wire, and the other end of the test elastic member is electrically connected to the N-phase circuit through the second circuit board under the pressing action of the test button.

[0014] Furthermore, a diode, a varistor and a test resistor are provided on the second circuit board, the diode is a full-bridge rectifier diode, the varistor is used to absorb surge voltage, and the test resistor is used to electrically connect the second circuit board to the test circuit.

[0015] Furthermore, a pair of wiring terminals are provided in the protection pole, and the lower terminal is located on the left, and the upper terminal is located on the right, and a handle, an operating mechanism, a contact mechanism, an arc extinguishing chamber, a short-circuit protection mechanism and an overload protection mechanism are provided between the upper terminal and the lower terminal, wherein the handle is linked and connected with the operating mechanism and arranged at the upper part, the moving contact of the contact mechanism is connected to the lower part of the operating mechanism, the arc extinguishing chamber is arranged in the middle part and the static contact of the contact mechanism is arranged on one side of the arc extinguishing chamber, and a short-circuit protection mechanism is arranged between the arc extinguishing chamber and the handle, the short-circuit protection mechanism is opposite to the operating mechanism, and an overload protection mechanism is provided on one side of the moving contact, and one end of the overload protection mechanism cooperates with the operating mechanism to trigger the operating mechanism to trip.

[0016] Furthermore, an auxiliary contact mechanism that can be triggered by an operating mechanism is also provided on the circuit of the protection pole. The auxiliary contact mechanism causes the power-taking circuit of the protection pole of the circuit board to lose power or gain power as the operating mechanism opens and closes. The auxiliary contact mechanism includes a conductive element and an elastic conductive part. The conductive element is electrically connected to the circuit board, one end of the elastic conductive part is electrically connected to a terminal of the protection pole, and the other end of the elastic conductive part can cooperate with the conductive element under the action of the operating mechanism, and the circuit in the protection pole can be opened or closed by closing the auxiliary contact mechanism.

[0017] A residual current operated circuit breaker of the present invention, a first circuit board and a second circuit board are electrically connected to each other and are separately arranged, the first circuit board is arranged inside a shell in a manner of penetrating a protective pole and a neutral pole, which is beneficial for the first circuit board to obtain power from each pole, and the second circuit board is separately arranged in the neutral pole, which is beneficial for driving a residual current tripping mechanism arranged in the neutral pole. The circuit board adopts such a structure to facilitate the realization of its function, can reduce the space occupied by the wiring of the circuit board, shorten the length of the wire, and improve the working performance of the circuit board.

[0018] In addition, a test circuit for detecting the residual current operating characteristics of the circuit breaker is also provided. The test circuit is provided in the neutral pole and connected to the second circuit board.

[0019] In addition, an auxiliary contact mechanism is also provided on the line of the protection pole. The auxiliary contact mechanism causes the power-taking circuit of the protection pole of the circuit board to lose power or gain power as the operating mechanism opens and closes. Regardless of whether the input / output line terminal or the power supply / load terminal of the line is reversed, when the circuit breaker is opened, the auxiliary contact mechanism causes the circuit board connected to the protection pole line to be in a power-off state, ensuring that the circuit board will not be damaged by shocks such as overvoltage and lightning current. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1-2 It is a structural schematic diagram of an electronic residual current operated circuit breaker of the present invention;

[0021] Figure 3-4 It is a structural schematic diagram of a housing in an electronic residual current operated circuit breaker of the present invention;

[0022] Figure 5 It is a schematic diagram of the installation of a first circuit board and a residual current detection transformer in an electronic residual current operated circuit breaker of the present invention;

[0023] Figure 6 It is a structural schematic diagram of a protection pole in an electronic residual current operated circuit breaker of the present invention (B phase protection pole);

[0024] Figure 7 It is a structural schematic diagram of a neutral pole of an electronic residual current operated circuit breaker of the present invention;

[0025] Figure 8 It is a circuit connection schematic diagram of an electronic residual current operated circuit breaker of the present invention;

[0026] Figure 9-10 It is a structural schematic diagram of a first circuit board in an electronic residual current operated circuit breaker of the present invention;

[0027] Fig.11 The invention discloses a schematic installation diagram of a second end surface of an electronic residual current operated circuit breaker. DETAILED DESCRIPTION

[0028] The following is combined with Figures 1 to 11 The given embodiments further illustrate the specific implementation of an electronic residual current operated circuit breaker of the present invention. An electronic residual current operated circuit breaker of the present invention is not limited to the description of the following embodiments. The left side, right side, upper side and lower side described in the embodiments are relative positional relationships, and do not specifically refer to left, right, upper and lower sides.

[0029] An electronic residual current operated circuit breaker includes a housing 1, in which three protection poles and a neutral pole 3 are arranged in parallel, wherein the three protection poles are A-phase protection pole 21, B-phase protection pole 22 and C-phase protection pole 23, respectively, which are connected to one phase line of the three-phase lines A, B and C in the main line of the circuit breaker, and the neutral pole 3 is connected to the N-phase line in the main line of the circuit breaker, and the neutral pole 3 is arranged on one side of the A-phase protection pole 21 or one side of the C-phase protection pole 23. The present application takes the neutral pole 3 arranged on one side of the C-phase protection pole 23 as an example, see Figure 6 , 7 direction, with the direction of the housing 1 from the protection pole to the neutral pole 3 as the width direction, which is shown in the figure as the front-to-back direction perpendicular to the paper surface. Preferably, the total width of the housing 1 is 72 mm, and the housing 1 is evenly divided into four poles along the width direction, wherein the width of each pole is 18 mm, i.e., one module width; a pair of terminals are provided in any pole and are respectively arranged on both sides of each pole, in each pole, the direction from one terminal to another terminal is the length direction, which is the left-right direction parallel to the paper surface in the figure, and the direction perpendicular to the length direction is the height direction, which is the up-down direction parallel to the paper surface in the figure.

[0030] The housing 1 is preferably a convex structure with a high middle and low sides, that is, the central part of the upper part of the housing 1 protrudes upward to form a protrusion 11, the upper surface of the protrusion 11 serves as an upper end surface 111, and the side walls of the protrusion 11 on the left and right sides of the upper end surface 111 serve as the first side walls 112 ( Figure 3 The left side wall of the protrusion) and the second side wall 113 of the protrusion ( Figure 3The surfaces of the housing 1 located on both sides of the protrusion 11 are respectively used as the first end surface 12 ( Figure 4 The second end surface 13 ( Figure 4 The first side wall 112 of the protrusion is connected between the first end face 12 and the upper end face 111, the second side wall 113 of the protrusion is connected between the second end face 13 and the upper end face 111, and the first end face 12 is connected between the first side wall 112 of the protrusion and the first side wall 14 of the housing 1 ( Figure 3 The second end surface 13 is connected between the second side wall 113 of the protruding portion and the second side wall 15 ( Figure 3 Further, a groove structure serving as a slide rail mounting groove 18 is provided in the central portion of the lower portion of the shell 1, and the bottom surfaces on the left and right sides of the slide rail mounting groove 18 serve as the first bottom surface 16 ( Figure 3 The left side of the slide rail mounting groove 18) and the second bottom surface 17 ( Figure 3 In this embodiment, wiring terminals are arranged inside the housing 1 between the first end face 12 and the first bottom face 16 and between the second end face 13 and the second bottom face 17, wherein the wiring terminal between the first end face 12 and the first bottom face 16 is the lower terminal of each pole, and the wiring terminal between the second end face 13 and the second bottom face 17 is the upper terminal of each pole.

[0031] The structures of the three protection poles arranged in the housing 1 are similar. A pair of wiring terminals are provided in each protection pole, and the lower terminal is located on the left, and the upper terminal is located on the right. A handle, an operating mechanism, a contact mechanism, an arc extinguishing chamber, a short-circuit protection mechanism and an overload protection mechanism are provided between the upper terminal and the lower terminal. The handle is linked and connected with the operating mechanism and arranged at the upper part. The moving contact of the contact mechanism is connected to the lower part of the operating mechanism. The arc extinguishing chamber is arranged in the middle part and the static contact of the contact mechanism is arranged on one side of the arc extinguishing chamber. A short-circuit protection mechanism is arranged between the arc extinguishing chamber and the handle, and the short-circuit protection mechanism corresponds to the operating mechanism. An overload protection mechanism is provided between the moving contact and the mounting cavity 19, and one end of the overload protection mechanism cooperates with the operating mechanism to trigger the operating mechanism to trip.

[0032] Preferably, an auxiliary contact mechanism that can be triggered by an operating mechanism is also provided on the circuit of the protection pole, and the auxiliary contact mechanism causes the power-taking circuit of the protection pole of the circuit board to lose power or gain power as the operating mechanism opens and closes; the auxiliary contact mechanism includes a conductive element and an elastic conductive part, the conductive element is electrically connected to the circuit board, one end of the elastic conductive part is electrically connected to a terminal of the protection pole, and the other end of the elastic conductive part can cooperate with the conductive element under the action of the operating mechanism, and the circuit in the protection pole is operated by closing or opening the auxiliary contact mechanism. Under the action of the auxiliary contact mechanism, regardless of whether the input / output line terminal or the power supply / load terminal of the line is reversed, when the circuit breaker is opened, the auxiliary contact mechanism puts the circuit board in a power-off state, thereby ensuring that the circuit board will not be damaged by impacts such as overvoltage and lightning current.

[0033] An improvement of the present application is that a mounting cavity 19 is provided between the second side wall 113 of the protruding portion and the second side wall 15 of the housing 1. Figure 5-7 As shown, the installation cavity 19 is arranged along the width direction of the housing 1 and penetrates each pole, specifically located on the left side of the upper terminal of each pole, and the installation cavity 19 is located below the second end surface 13. The circuit board arranged in the housing 1 for collecting and processing the main line current signal of the circuit breaker and driving the circuit breaker to operate according to the current signal can be arranged in the installation cavity 19. The installation of the circuit board in the installation cavity 19 will not increase the width of the housing 1. For example, compared with the structure of the existing housing 1 with a current level of 63A and a residual current operated circuit breaker with a pole number of 3P+N and an assembly width of 6.5 modules, the installation direction of the circuit board is changed by setting the installation cavity 19. Under the condition of reaching the same current level, the overall width of the present application is 4 modules, and its internal structure is more compact and occupies less space. Furthermore, the second end face 13 is detachably connected to the housing 1, which is convenient for installing a circuit board for collecting and processing the main circuit current signal of the circuit breaker to drive the circuit breaker in the installation cavity 19. The circuit board can be finally installed in the installation cavity 19, which simplifies the installation process of the circuit board in the compact housing 1 and facilitates operation. The circuit board is electrically connected to the circuits in the A-phase protection pole 21, the B-phase protection pole 22, the C-phase protection pole 23 and the neutral pole 3 respectively. The circuit of the circuit board processes the current input to the circuit board and can drive the circuit breaker to operate according to the collected signal.

[0034] like Figure 8As shown, in the electrical principle of the circuit board in this embodiment, the circuit board includes a power supply circuit, a signal processing circuit and a tripping circuit. The power supply circuit of the circuit board is connected to the main line of the circuit breaker. The power supply of the main line is subjected to surge absorption, rectification, filtering and voltage reduction processing in sequence to supply power to the signal processing circuit and the tripping circuit of the circuit board. The signal processing circuit collects the current signal of the main line through the residual current detection transformer 5. The signal processing circuit determines whether there is residual current on the main line of the circuit breaker according to the collected current signal. After the signal processing circuit determines that there is residual current, the tripping circuit is driven to operate. The tripping circuit drives the operating mechanism of the circuit breaker to operate so that the circuit breaker is tripped and the power is cut off. Preferably, the circuit breaker is also provided with a test circuit 36 ​​for detecting the operation of the circuit breaker. The test circuit 36 ​​is connected to the main line for generating a simulated residual current. The circuit board collects the simulated residual current through the residual current detection transformer 5. Under the drive of the signal processing circuit, the tripping circuit is driven to operate and drive the operating mechanism of the circuit breaker to operate so that the circuit breaker is tripped and the power is cut off. The signal processing circuit of the circuit board includes a chip for processing current signals, and the chip may be a microcontroller MCU or a single-chip microcomputer.

[0035] An improvement of the present embodiment lies in the structure and installation position of the circuit board. The circuit board for driving the circuit breaker preferably includes a first circuit board 41 and a second circuit board 42 which are electrically connected to each other, wherein the first circuit board 41 is respectively connected to each phase line of the A-phase protection pole 21, the B-phase protection pole 22, and the C-phase protection pole 23, the second circuit board 42 is connected to the N-phase line of the neutral pole 3, and a signal processing circuit and a tripping circuit are provided on the second circuit board 42. The power supply circuit of the circuit board includes a surge absorption circuit and a rectification circuit provided on the first circuit board 41, and at least a filtering circuit and a step-down circuit provided on the second circuit board 42. Preferably, a surge absorption circuit and a rectification circuit are also provided on the second circuit board 42. Furthermore, the first circuit board 41 and the second circuit board 42 are separately arranged by utilizing the gap in the housing 1. The first circuit board 41 is arranged inside the housing 1 in a manner of penetrating the protective pole and the neutral pole 3, which is beneficial for the first circuit board 41 to draw electricity from each pole. The second circuit board 42 is separately arranged in the neutral pole 3, which is beneficial for driving the residual current tripping mechanism 35 arranged in the neutral pole 3. The circuit board adopts such a structure, which is conducive to realizing its function, can reduce the space occupied by the circuit board wiring, shorten the wire length, and improve the working performance of the circuit board.

[0036] Combination Figure 8A specific connection method for a power supply circuit is provided, wherein one end of a surge absorption circuit arranged on a first circuit board 41 is connected to each phase line of an A-phase protection electrode 21, a B-phase protection electrode 22, and a C-phase protection electrode 23, and the other end of the surge absorption circuit is connected to one end of a rectifier circuit on the first circuit board 41; one end of a surge absorption circuit arranged on a second circuit board 42 is connected to an N-phase line of a neutral pole 3, and the other end of the surge absorption circuit is connected to one end of a rectifier circuit on the second circuit board 42, and the other ends of the rectifier circuits on the first circuit board 41 and the second circuit board 42 are both connected to one end of a filter circuit arranged on the second circuit board 42, and the other end of the filter circuit is connected to one end of a step-down circuit, and the other end of the step-down circuit is connected to a signal processing circuit and a tripping circuit as an output end of the power supply circuit.

[0037] The first circuit board 41 is arranged through the protective pole and the neutral pole 3. In the present embodiment, an installation cavity 19 which passes through the protective pole and the neutral pole 3 is arranged for the installation of the first circuit board 41. The first circuit board 41 is arranged in the installation cavity 19 along a direction parallel to the second end face 13. Such a structure is conducive to the first circuit board 41 to obtain power from the A, B, and C phase circuits. The circuit elements installed on the front and back sides of the first circuit board 41 are also more convenient for wiring, reducing the amount of wires used and the space occupied. Moreover, the size of the first circuit board 41 can be adjusted according to the width of the housing 1, and the setting of the first circuit board 41 will not increase the overall width of the circuit breaker. In addition, such an installation method is combined with the detachable second end face 13, so that the first circuit board 41 can be finally installed in the housing 1, which is convenient to install and easy to operate.

[0038] The second circuit board 42 is arranged along the length direction of the neutral pole 3. A signal processing circuit is provided on the second circuit board 42 for processing the current signal fed back by the residual current detection transformer 5 and driving the tripping circuit arranged on the second circuit board 42 to operate according to the processed current signal, thereby controlling the circuit breaker to operate. The second circuit board 42 is electrically connected to the first circuit board 41 and is separately arranged inside the housing 1 to avoid the two circuit boards being arranged together in the installation cavity 19 and occupying too much space. In addition, the second circuit board 42 is arranged away from the wiring terminal to avoid the second circuit board 42 being affected by the increase in the temperature of the wiring terminal. Compared with the circuit board of the existing circuit breaker arranged at the neutral pole 3, the second circuit board 42 is smaller in size, which is conducive to the overall miniaturization design and reduces costs.

[0039] The structure of the first circuit board 41 is as follows: Fig. 9 , 10As shown, the first circuit board 41 is installed with multiple varistors 43, and multiple wiring pads for connecting to the main circuit of the circuit breaker are provided on one side of the varistor 43. The wiring pads can enable the first circuit board 41 to be welded to the wires of the A-phase protection pole 21, the B-phase protection pole 22 and the C-phase protection pole 23 after installation. In addition, the wires connected to the first circuit board 41 are preferably arranged in the installation cavity 19 to avoid the wires from being entangled and occupying too much internal space. In this embodiment, the number of the varistors 43 is three, which are the first varistor, the second varistor and the third varistor corresponding to the A-phase protection electrode 21, the B-phase protection electrode 22 and the C-phase protection electrode 23, respectively, and the varistor 43 is located on the side of the first circuit board 41 facing away from the second end surface 13, and a plurality of protruding mounting portions 411 are extended outward from the edge of one side of the first circuit board 41, and an avoidance gap 412 for avoiding the wiring terminal is formed between two adjacent mounting portions 411. The mounting portions 411 and the avoidance gap 412 make one side of the first circuit board 41 present a comb-like structure, and a diode 44 is arranged on the front and back sides of each mounting portion 411. Such a structure makes full use of the space around the wiring terminal and facilitates the wiring of the first circuit board 41. In the present embodiment, there are three mounting parts 411, which are the first mounting part, the second mounting part and the third mounting part corresponding to the A-phase protection electrode 21, the B-phase protection electrode 22 and the C-phase protection electrode 23. When the wiring terminals of the A-phase protection electrode 21, the B-phase protection electrode 22 and the C-phase protection electrode 23 extend into the avoidance gap 412 respectively, the three mounting parts 411 are respectively located between two adjacent wiring terminals, and a full-bridge rectifier diode is arranged on one side of each mounting part 411. Preferably, the full-bridge rectifier diode and the varistor 43 are on the same side of the first circuit board 41, and a diode 44 is arranged on the other side of each mounting part 411.

[0040] The second circuit board 42 is also provided with a full-bridge rectifier diode and a varistor 43, and a signal processing circuit and a tripping circuit for collecting and processing current signals are both arranged on the second circuit board 42. Preferably, a test resistor of the test circuit 36 ​​is also provided on the second circuit board 42. The second circuit board 42 is connected to the test circuit 36 ​​through the test resistor to complete the inspection of the circuit breaker action characteristics.

[0041] A test circuit 36 ​​for detecting the operating characteristics of the circuit breaker can be set in any pole. The test circuit 36 ​​includes a test button 361 and a test device triggered by the test button 361. The test device includes a test elastic member 362 and a test wire. The test elastic member 362 is made of elastic conductive material. One end of the test elastic member 362 is connected to the circuit of any protective pole of the circuit breaker through a test wire. The other end of the test elastic member 362 is electrically connected to the N-phase circuit of the neutral pole 3. Any end of the test elastic member 362 is electrically connected when the test button 361 is pressed. In this embodiment, one end of the test elastic member 362 connected to the N-phase circuit is pressed by the test button 361. Preferably, when the test button 361 is pressed, the test elastic member 362 is connected to a conductive shaft in the N-phase circuit, and the conductive shaft is connected to the test resistor on the second circuit board 42. At this time, the test circuit 36 ​​is turned on to generate a simulated residual current. Of course, the end of the test elastic member 362 pressed by the test button 361 can be directly electrically connected to the test resistor or electrically connected through another test wire.

[0042] Another improvement of the present application is that the residual current detection transformer 5 used to feed back to the circuit board whether there is a residual current signal in the main circuit is arranged together with the first circuit board 41 in the installation cavity 19, and the residual current detection transformer 5 is also arranged along the width direction of the housing 1, and the residual current detection transformer 5 is located below the first circuit board 41 and below the varistor 43 of the first circuit board 41. Preferably, the residual current detection transformer 5 is in the shape of a capsule, and the center hole 51 arranged in the middle of the residual current detection transformer 5 for each phase line in each protection pole to pass through is elliptical. Compared with the existing residual current detection transformer 5, the elliptical center hole 51 is larger, so that the conductive parts of each phase line can be welded together first and then pass through the residual current detection transformer 5. Compared with the existing installation method of passing through the residual current detection transformer 5 first and then welding, the production process is simplified and the assembly difficulty is reduced.

[0043] In this embodiment, the second end face 13 that seals the installation cavity 19 and the wiring terminal in the housing 1 is preferably connected to the housing 1 in a detachable manner. A plurality of wiring screw holes for operating the wiring terminal are provided on the second end face 13. The second end face 13 is connected to the second side wall 113 and the second side wall 15 of the protruding portion through a matching snap-fit ​​structure, so that the second end face 13 can be detachably installed on the housing 1. Figure 5 , 11 An embodiment is provided in which the second end surface 13 is detachably connected to the housing 1, wherein the bottom of the second side wall 113 of the protruding portion protrudes outward and is provided with a plurality of first bosses 1131 ( Figure 5The plurality of first bosses 1131 are arranged at intervals and a first clamping groove 1132 is provided at the junction of each first boss 1131 and the second side wall 113 of the protruding portion, and a first engaging portion 131 that can cooperate with the first clamping groove 1132 is provided on one side of the second end surface 13. Fig.11 The first engaging portion 131 is a plurality of boss structures, which are integrally formed by the left edge of the second end face 13; a plurality of second slots 151 are provided at intervals on the upper edge of the second side wall 15 of the housing 1, and preferably, a plurality of second slots 151 are provided at intervals of one wiring terminal, and a plurality of second engaging portions 132 that can cooperate with the second slots 151 are provided on the other side of the second end face 13, and specifically, the second engaging portion 132 is a boss structure provided at the lower part of the right edge of the second end face 13. When installing the second end face 13, it is preferred to first match the first clamping portion 131 with the first clamping groove 1132, and the second end face 13 rotates with the first clamping portion 131 and the first clamping groove 1132 as a fulcrum, so that the second clamping portion 132 of the second end face 13 matches the second clamping groove 151, so that the second end face 13 is detachably installed on the housing 1, and the installation cavity 19 and the wiring terminal are enclosed inside the housing 1. Of course, a wiring screw hole corresponding to the wiring terminal is provided on the second end face 13, and the wiring screw hole is preferably arranged in an offset manner with the second clamping portion 132.

[0044] Combination Figure 6The internal structure of the protection electrode is introduced in detail. Taking the B-phase protection electrode 22 as an example, the B-phase protection electrode 22 includes a B-phase shell, in which a pair of wiring terminals are arranged, and the wiring terminals are arranged on both sides of the B-phase shell along the length direction of the B-phase shell, wherein the wiring terminal close to the first side wall 14 is the B-phase lower terminal 2212, and the wiring terminal close to the second side wall 15 is the B-phase upper terminal 2211. A B-phase handle 222, a B-phase operating mechanism 223 and a B-phase contact mechanism are arranged between the B-phase upper terminal 2211 and the B-phase lower terminal 2212. The B-phase handle 222 is linked to the B-phase operating mechanism 223 and is arranged together At the upper part of the B-phase shell, the B-phase moving contact 2241 of the B-phase contact mechanism is connected to the lower part of the B-phase operating mechanism 223, and the B-phase static contact 2242 of the B-phase contact mechanism is fixedly arranged in the middle part of the B-phase shell and opposite to the B-phase moving contact 2241. A B-phase arc extinguishing chamber 225 and a B-phase short-circuit protection mechanism 226 are provided between the B-phase static contact 2242 and the B-phase lower terminal 2212. The B-phase arc extinguishing chamber 225 is arranged at the lower part of the B-phase shell, and the B-phase short-circuit protection mechanism 226 is arranged between the B-phase handle 222 and the B-phase arc extinguishing chamber 225, and one end of the B-phase short-circuit protection mechanism 226 corresponds to the B-phase operating mechanism 223. An installation cavity 19 is arranged between the B-phase moving contact 2241 and the B-phase upper terminal 2211, and the installation cavity 19 divides the right side of the B-phase shell into two parts, among which only the B-phase upper terminal 2211 is located on the right side of the installation cavity 19, and the installation cavity 19 is arranged to be connected with the adjacent A-phase protection pole 21 and B-phase protection pole 22 along the width direction, and a first circuit board 41 is installed on the upper part of the installation cavity 19, and an avoidance notch 412 arranged on the first circuit board 41 corresponds to the B-phase upper terminal 2211, and a residual current detection transformer 5 is installed on the lower part of the installation cavity 19, and the B-phase circuit of the B-phase protection pole 22 is connected through the center hole 51 of the residual current detection transformer 5. An overload protection mechanism is provided between the B-phase moving contact 2241 and the installation cavity 19. In the present embodiment, the B-phase overload protection mechanism 227 is composed of a bimetallic component, one end of which is fixedly installed, and the other end of the bimetallic component serves as a movable end to cooperate with the B-phase operating mechanism 223, so as to trigger the B-phase operating mechanism 223 to trip when an overload occurs in the line.

[0045] Preferably, the B-phase circuit arranged in the B-phase protection electrode 22 is provided with a B-phase auxiliary contact mechanism 228 which can be triggered by the B-phase operating mechanism 223, and the B-phase auxiliary contact mechanism 228 causes the B-phase power circuit of the circuit board to lose power or gain power as the B-phase operating mechanism 223 opens and closes; the B-phase auxiliary contact mechanism 228 includes a B-phase conductive element and a B-phase elastic conductive element, the B-phase conductive element is electrically connected to the circuit board, one end of the B-phase elastic conductive element is electrically connected to the B-phase lower terminal 2212, and the other end of the B-phase elastic conductive element can be Under the action of the B-phase operating mechanism 223, it cooperates with the B-phase conductive element to close or open the B-phase auxiliary contact mechanism 228 to operate the on and off of the B-phase line. The B-phase conductive element includes a B-phase conductive component body and a B-phase lead wire. One end of the B-phase conductive component body is connected to the circuit board through the B-phase lead wire. In this embodiment, the B-phase lead wire is connected to the first circuit board 41, and the other end of the B-phase conductive component body is used to contact and cooperate with the B-phase elastic conductive component. Preferably, the B-phase elastic conductive component is a torsion spring, and the B-phase conductive component is a conductive plate made of metal material. Under the action of the B-phase auxiliary contact mechanism 228, no matter whether the input / output line terminal or the power supply / load terminal of the B-phase line is reversed, when the circuit breaker is opened, the B-phase auxiliary contact mechanism 228 and the A-phase auxiliary contact mechanism and the C-phase auxiliary contact mechanism respectively arranged in the A-phase housing and the C-phase housing make the first circuit board 41 in a power-off state. At this time, the second circuit board 42 electrically connected to the first circuit board 41 is also in a power-off state, ensuring that the circuit board will not be damaged by impacts such as overvoltage and lightning current.

[0046] Similarly, the A-phase protection pole 21 also includes an A-phase housing, and a pair of wiring terminals, an A-phase handle, an A-phase operating mechanism, an A-phase contact mechanism, an A-phase arc extinguishing chamber, an A-phase short-circuit protection mechanism, and an A-phase overload protection mechanism are arranged in the A-phase housing; the C-phase protection pole 23 includes a C-phase housing and a pair of wiring terminals, a C-phase handle, a C-phase operating mechanism, a C-phase contact mechanism, a C-phase arc extinguishing chamber, a C-phase short-circuit protection mechanism, and a C-phase overload protection mechanism arranged in the C-phase housing, and the components in the A-phase housing and the C-phase housing are installed externally corresponding to the installation positions of the components in the B-phase housing, wherein the A-phase handle, the B-phase handle 222, and the C-phase handle are linked and connected, and the A-phase operating mechanism, the B-phase operating mechanism 223, and the C-phase operating mechanism are also linked and connected. Of course, the B-phase auxiliary contact used in the B-phase protection pole 22 and the connection principle with the first circuit board 41 are also applicable to the circuits of the A-phase protection pole 21 and the C-phase protection pole 23.

[0047] Combination Figure 5 and 7The neutral pole 3 is introduced in detail. The neutral pole 3 includes an N-phase housing, in which a pair of wiring terminals are arranged. The wiring terminals are arranged on the left and right sides of the N-phase housing as an N-phase lower terminal 312 and an N-phase upper terminal 311 respectively. An N-phase handle 32, an N-phase operating mechanism 33 and an N-phase contact mechanism are arranged between the N-phase upper terminal 311 and the N-phase lower terminal 312. The N-phase handle 32 is linked and connected with the N-phase operating mechanism 33 and is arranged at the upper part of the N-phase housing. The N-phase moving contact 341 of the N-phase contact mechanism is connected to the lower part of the N-phase operating mechanism 33. The N-phase static contact 342 of the N-phase contact mechanism is arranged at the middle and lower part of the N-phase housing and cooperates with the N-phase moving contact 341. A residual current tripping mechanism 35 and a second circuit board 42 are also arranged in the N-phase housing. The residual current tripping mechanism 35 is located in the middle part of the N-phase housing and between the N-phase operating mechanism 33 and the N-phase lower terminal 3 12, the second circuit board 42 is stacked in the lower part of the N-phase housing along the length direction of the N-phase housing and is located between the N-phase static contact 342 and the N-phase lower terminal 312. The second circuit board 42 is connected to the N-phase line of the circuit breaker through a conductive line to realize N-phase power supply. A full-bridge rectifier diode and a varistor are stacked on the second circuit board 42, and a signal processing circuit and a tripping circuit are provided on the second circuit board 42. The tripping circuit is connected to the residual current tripping mechanism 35; the installation cavity 19 is connected to the installation cavity 19 in the A-phase protection pole 21, the B-phase protection pole 22 and the C-phase protection pole 23, and is located between the N-phase moving contact 341 and the N-phase upper terminal 311. The same first circuit board 41 and the residual current detection transformer 5 are arranged in the installation cavity 19, and the N-phase line of the neutral pole 3 passes through the center hole 51 on the residual current detection transformer 5. Of course, when the N-phase line in the neutral pole 3 is a straight-through type, the N-phase contact mechanism may not be provided.

[0048] In this embodiment, the test circuit 36 ​​is arranged in the neutral pole 3, and a test button 361 in the test circuit 36 ​​is arranged on the upper part of the N-phase housing. The test button 361 is located on one side of the N-phase operating mechanism 33. Figure 7 As shown, the test button 361 is located on the right side of the N-phase operating mechanism 33, on the right side of the upper end surface 111 of the shell 1, and the lower part of the test button 361 extends into the interior of the N-phase shell. The test elastic member 362 of the test circuit 36 ​​is preferably a conductive torsion spring, one end of which is connected to a test wire on the C-phase circuit of the C-phase protection pole 23, and the other end of the torsion spring is connected to a conductive shaft arranged on the N-phase circuit under the pressing action of the test button 361. The conductive shaft is used to draw power from the N-phase of the second circuit board 42 and is electrically connected to the test resistor of the second circuit board 42.

[0049] In addition, the housing 1 in the present application is composed of an A-phase housing, a B-phase housing, a C-phase housing and an N-phase housing. The housings of the four poles have the same shape, the width of each pole housing is 18 mm, and adjacent poles are separated by partitions (not shown) in each pole housing, and wire holes may be provided on the partitions.

[0050] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. An electronic residual current operated circuit breaker, comprising a housing (1) and a plurality of protective poles and a neutral pole (3) arranged inside the housing (1); a circuit board for collecting and processing a current signal of a main circuit of the circuit breaker and driving the circuit breaker to operate according to the current signal is arranged inside the housing (1); the circuit board comprises a signal processing circuit, a tripping circuit and a power supply circuit for supplying power to both; the signal processing circuit determines whether there is a residual current on the main circuit of the circuit breaker according to the collected current signal; after the signal processing circuit determines that there is a residual current, the tripping circuit is driven to operate; the tripping circuit drives the operating mechanism of the circuit breaker to operate so that the circuit breaker trips and cuts off the power; the circuit board is characterized in that: The circuit board comprises an electrically connected first circuit board (41) and a second circuit board (42); the first circuit board (41) is arranged in the protective pole and the neutral pole (3) along the width direction of the housing (1); the first circuit board (41) is respectively connected to each phase line in a plurality of protective poles; the second circuit board (42) is arranged in the neutral pole (3); and the signal processing circuit and the tripping circuit are arranged on the second circuit board (42).

2. An electronic residual current operated circuit breaker according to claim 1, characterized in that: The power supply circuit comprises a surge absorption circuit, a rectifier circuit, a filter circuit and a step-down circuit which are connected in sequence. The surge absorption circuit and the rectifier circuit are arranged on the first circuit board (41), and at least the filter circuit and the step-down circuit are arranged on the second circuit board (42).

3. An electronic residual current operated circuit breaker according to claim 2, characterized in that: One end of a surge absorption circuit arranged on the first circuit board (41) is connected to each phase circuit of each protection electrode, and the other end of the surge absorption circuit is connected to one end of a rectifier circuit on the first circuit board (41); A surge absorption circuit and a rectifier circuit are also provided on the second circuit board (42); one end of the surge absorption circuit provided on the second circuit is connected to the N-phase circuit of the neutral pole (3); the other end of the surge absorption circuit is connected to one end of the rectifier circuit provided on the second circuit board (42); the other ends of the rectifier circuits on the first circuit board (41) and the second circuit board (42) are both connected to one end of the filter circuit provided on the second circuit board (42); the other end of the filter circuit is connected to one end of the step-down circuit; the other end of the step-down circuit is connected to the signal processing circuit and the tripping circuit as the output end of the power supply circuit.

4. The electronic residual current operated circuit breaker according to claim 1, characterized in that: The number of the protection electrodes is three, namely, the A-phase protection electrode (21), the B-phase protection electrode (22) and the C-phase protection electrode (23); a first varistor, a second varistor and a third varistor are arranged on the first circuit board (41), which correspond to the A-phase protection electrode (21), the B-phase protection electrode (22) and the C-phase protection electrode (23); a wiring pad is arranged on the first circuit board (41), and the wiring pad is electrically connected to the A-phase protection electrode (21), the B-phase protection electrode (22) and the C-phase protection electrode (23) through a wire; and a diode (44) is also arranged on the first circuit board (41), which corresponds to the A-phase protection electrode (21), the B-phase protection electrode (22) and the C-phase protection electrode (23).

5. An electronic residual current operated circuit breaker according to claim 4, characterized in that: The first varistor, the second varistor and the third varistor are all located on a side of the first circuit board (41) facing away from the housing (1); three mounting portions (411) are extended outwardly from one side edge of the first circuit board (41); an escape notch (412) is formed between two adjacent mounting portions (411); the mounting portions (411) and the escape notch (412) make one side of the first circuit board (41) present a comb-like structure; each mounting portion (411) corresponds to an A-phase protection electrode (21), a B-phase protection electrode (22) and a C-phase protection electrode (23); and diodes (44) are provided on both the front and back sides of each mounting portion (411).

6. An electronic residual current operated circuit breaker according to claim 1, characterized in that: The neutral pole (3) comprises an N-phase housing, a pair of connection terminals are arranged in the N-phase housing, the connection terminals are arranged on the left and right sides of the N-phase housing as the N-phase lower terminal (312) and the N-phase upper terminal (311), respectively, an N-phase handle (32), an N-phase operating mechanism (33) and an N-phase contact mechanism are arranged between the N-phase upper terminal (311) and the N-phase lower terminal (312), the N-phase handle (32) and the N-phase operating mechanism (33) are linked and connected and arranged on the upper part of the N-phase housing, the N-phase moving contact (341) of the N-phase contact mechanism is connected to the lower part of the N-phase operating mechanism (33), and the N-phase static contact (341) of the N-phase contact mechanism is connected to the lower part of the N-phase operating mechanism (33). (342) is arranged in the middle and lower part of the N-phase housing and cooperates with the N-phase moving contact (341). A residual current tripping mechanism (35) and a second circuit board (42) are also arranged in the N-phase housing. The residual current tripping mechanism (35) is arranged in the middle part of the N-phase housing and is located between the N-phase operating mechanism (33) and the N-phase lower terminal (312). The second circuit board (42) is stacked in the lower part of the N-phase housing along the length direction of the N-phase housing and is located between the N-phase static contact (342) and the N-phase lower terminal (312). The second circuit board (42) is connected to the N-phase line of the circuit breaker through a conductive wire to realize N-phase power supply.

7. An electronic residual current operated circuit breaker according to claim 1 or 6, characterized in that: A test circuit (36) is also provided in the neutral pole (3), the test circuit (36) comprising a test button (361) and a test device triggered by the test button (361), the test device comprising a test elastic member (362) and a test wire, the test elastic member (362) being made of elastic conductive material, one end of the test elastic member (362) being connected to a circuit of any protective pole of the circuit breaker via a test wire, and the other end of the test elastic member (362) being electrically connected to an N-phase circuit via a second circuit board (42) under the pressing action of the test button (361).

8. An electronic residual current operated circuit breaker according to claim 7, characterized in that: A diode (44), a varistor (43) and a test resistor are provided on the second circuit board (42); the diode (44) is a full-bridge rectifier diode; the varistor (43) is used to absorb surge voltage; and the test resistor is used to electrically connect the second circuit board (42) to the test circuit (36).

9. An electronic residual current operated circuit breaker according to claim 1, characterized in that: A pair of wiring terminals are provided in the protection pole, and the lower terminal is located on the left side, and the upper terminal is located on the right side. A handle, an operating mechanism, a contact mechanism, an arc extinguishing chamber, a short-circuit protection mechanism and an overload protection mechanism are provided between the upper terminal and the lower terminal. The handle is linked and connected with the operating mechanism and is arranged at the upper part. The moving contact of the contact mechanism is connected to the lower part of the operating mechanism. The arc extinguishing chamber is arranged in the middle part and the static contact of the contact mechanism is arranged on one side of the arc extinguishing chamber. A short-circuit protection mechanism is arranged between the arc extinguishing chamber and the handle. The short-circuit protection mechanism is opposite to the operating mechanism. An overload protection mechanism is provided on one side of the moving contact. One end of the overload protection mechanism cooperates with the operating mechanism to trigger the operating mechanism to trip.

10. An electronic residual current operated circuit breaker according to claim 9, characterized in that: An auxiliary contact mechanism that can be triggered by an operating mechanism is also provided on the circuit of the protection pole. The auxiliary contact mechanism causes the power-taking circuit of the protection pole of the circuit board to lose power or gain power as the operating mechanism opens and closes. The auxiliary contact mechanism includes a conductive element and an elastic conductive part. The conductive element is electrically connected to the circuit board, one end of the elastic conductive part is electrically connected to a wiring terminal of the protection pole, and the other end of the elastic conductive part can cooperate with the conductive element under the action of the operating mechanism, and the circuit in the protection pole is operated to be turned on or off by closing or opening the auxiliary contact mechanism.

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