Electric leakage test assembly and circuit breaker

Abstract

The utility model provides an electric leakage test assembly and a circuit breaker, and belongs to the technical field of circuit breakers, and the electric leakage test assembly comprises an electromagnetic release, a first driven member and a second driven member. The electromagnetic release comprises a magnet yoke, and the magnet yoke is connected in a test loop of the circuit breaker in series. The first follower is arranged in the test loop in series and separably abuts against the magnet yoke to form a first breakpoint of the test loop for triggering the test loop to be conducted; and the second follower is arranged in the test loop in series and separably abuts against the magnet yoke to form a second breakpoint of the test loop, and is used for disconnecting the test loop when the electromagnetic tripper trips due to leakage current. Therefore, the test loop can be quickly switched on by closing the first breakpoint, and the test loop can be reliably switched off through the second breakpoint after the test is completed, so that other components in the circuit breaker are prevented from being damaged. And the first breakpoint and the second breakpoint are formed by using the conductive property of the magnet yoke in the electromagnetic release, so that the cost is saved.

Description

Technical Field

[0001] The present application relates to the technical field of circuit breakers, and in particular to a leakage test assembly and a circuit breaker. Background Art

[0002] The test circuit of the circuit breaker is an important part of the power system to ensure the normal operation and maintenance of the circuit breaker. When the test button is pressed, a short-circuit current appears in the test circuit of the circuit breaker, triggering the tripping operation to cut off the power supply circuit. It is used to detect the opening and closing functions of the circuit breaker and the effectiveness of the circuit connectivity.

[0003] The test circuit operates as follows: when the vector sum of the leakage currents flowing through the zero-sequence transformer exceeds a set value, the zero-sequence transformer outputs a signal, driving the electromagnetic release to trip, thereby disconnecting the circuit breaker from the power supply circuit. If the circuit breaker draws power from the outlet terminal, after the circuit breaker disconnects the power supply circuit, no current flows through the test circuit or the zero-sequence transformer. However, in some application scenarios, the circuit breaker needs to be connected in reverse order, so that the test circuit still has power after the circuit breaker is disconnected. In this case, if the test button is continuously pressed, the test circuit remains conductive, which can easily damage components such as the electromagnetic release. Utility Model Content

[0004] In view of the deficiencies in the prior art, the present application provides a leakage test assembly and a circuit breaker.

[0005] In a first aspect, the present application provides a leakage test assembly, comprising:

[0006] An electromagnetic release, comprising a magnetic yoke, wherein the magnetic yoke is connected in series in a test circuit of the circuit breaker;

[0007] a first follower, arranged in series in the test circuit, detachably abutting against the magnetic yoke to form a first breakpoint of the test circuit, and used to trigger the test circuit to be turned on;

[0008] The second follower is arranged in series in the test circuit and is detachably abutted against the magnetic yoke to form a second breakpoint of the test circuit, and is used to disconnect the test circuit when the electromagnetic release is tripped due to leakage current.

[0009] Optionally, a test button is also included;

[0010] The test button is used to drive the first follower to move toward the magnetic yoke when pressed, until the first follower and the magnetic yoke abut against each other, thereby triggering the test circuit to be turned on.

[0011] Optionally, the first follower is disposed in the housing of the circuit breaker and is arranged opposite to the test button;

[0012] The first follower contacts the yoke when the test button is pressed, and is separated from the yoke when no external force is applied to the test button.

[0013] Optionally, the first follower includes a first elastic conductor sheet;

[0014] One side of the first elastic conductor piece is connected to the line of the test circuit, and the other side extends to near the magnetic yoke, and the end face of the first elastic conductor piece is arranged opposite to the test button, so that the test button pushes the first elastic conductor piece to abut against the magnetic yoke when it is pressed.

[0015] Optionally, it further includes an indicator and a transmission structure cooperating with the indicator;

[0016] The electromagnetic release is connected to the transmission structure and is used to drive the transmission structure to move when there is a leakage current, so as to trigger the tripping action of the circuit breaker and unlock the transmission structure and the indicator, so that the indicator drives the second follower to move in a direction away from the magnetic yoke until the second follower is separated from the magnetic yoke to disconnect the test circuit.

[0017] Optionally, the second follower is disposed in the housing of the circuit breaker and is detachably abutted against one side of an indicator located in the housing of the circuit breaker; the other side of the indicator may extend out of the housing of the circuit breaker;

[0018] Wherein, when the circuit breaker is in a closed state, the second follower is separated from the indicator and abuts against the magnetic yoke; when the circuit breaker is in an open state, the second follower abuts against the indicator and is separated from the magnetic yoke.

[0019] Optionally, the indicator member includes an indicator block, an abutment block and a locking block;

[0020] The indicating block may extend out of the housing of the circuit breaker, and a second spring connected to the housing is provided in the indicating block, and the second spring applies an elastic force to the indicating block in a direction away from the magnetic yoke;

[0021] The abutment block is arranged on the indicating block and is arranged opposite to the second follower. When the circuit breaker is in a closed state, the abutment block is separated from the second follower, and when the circuit breaker is in an open state, the abutment block abuts against the second follower.

[0022] The locking block is arranged on the indicating block and cooperates with the transmission structure to realize locking or unlocking of the indicating member.

[0023] Optionally, the second follower includes a second elastic conductor sheet;

[0024] A connecting portion is formed on one side of the second elastic conductor sheet and is connected to a circuit of the test circuit;

[0025] An abutment portion is formed on the other side of the second elastic conductor piece and is arranged opposite to the abutment block. The end face of the second elastic conductor piece is detachably abutted against the magnetic yoke. The abutment block abuts against the abutment portion to drive the second elastic conductor piece to move away from the magnetic yoke until the end face of the second elastic conductor piece is separated from the magnetic yoke.

[0026] Optionally, a base limiting portion is further provided on the housing of the circuit breaker, and the base limiting portion is located on a side of the second elastic conductor piece close to the connecting portion to limit the second elastic conductor piece.

[0027] In a second aspect, in one embodiment, the present application provides a circuit breaker comprising the leakage test assembly as described above.

[0028] Through the above technical solution, this application has at least the following beneficial technical effects:

[0029] The yoke in the electromagnetic release serves as a conductive element connected in series with the circuit breaker's test circuit. In the absence of external force, the first follower naturally separates from the yoke. When a leakage test is required, closing the first breakpoint triggers the test circuit to conduct. The second follower is configured to abut the yoke without external force, maintaining conduction in the absence of external force. This allows the test circuit to conduct immediately after the first breakpoint is closed, generating a leakage current. The electromagnetic release then trips due to the leakage current, applying external force to the second follower, causing it to separate from the yoke and disconnecting the second breakpoint. This ensures that the test circuit can be quickly connected by closing the first breakpoint and reliably disconnected by the second breakpoint after the test is complete, thus preventing damage to other components in the circuit breaker caused by the test circuit remaining open. Furthermore, by utilizing the conductive properties of the yoke in the electromagnetic release to form the first and second breakpoints, cost savings are achieved, eliminating the need for additional switching elements in the test circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 This is a plan view of a leakage test assembly in an embodiment of the present application when the circuit breaker is in the on state;

[0032] Figure 2 This is a structural diagram of a leakage test assembly in a circuit breaker on state according to an embodiment of the present application;

[0033] Figure 3 This is a structural diagram of an electromagnetic release in one embodiment of the present application;

[0034] Figure 4 This is a schematic diagram of the transmission structure in one embodiment of the present application;

[0035] Figure 5 This is a plan view of a leakage test assembly during a test in one embodiment of the present application;

[0036] Figure 6 This is a plan view of a leakage test assembly in a test completion state in one embodiment of the present application;

[0037] Figure 7 This is a structural diagram of a leakage test component in an embodiment of the present application when the test is completed.

[0038] Explanation of the accompanying reference numerals: 1. electromagnetic release; 11. yoke; 12. coil; 13. moving iron core; 2. first follower; 21. first elastic conductor piece; 22. contact portion; 3. second follower; 32. second elastic conductor piece; 321. connecting portion; 322. abutting portion; 33. base limiting portion; 4. test button; 41. third spring; 5. indicator; 51. indicator block; 52. abutting block; 53. locking block; 54. second spring; 6. transmission structure; 61. transmission plate; 62. locking hole; 63. mounting plate. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0040] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more of the described features. In the description of this application, "plurality" means two or more, unless otherwise specifically qualified. In this application, the word "exemplary" is used to mean "serving as an example, illustration, or illustration." Any embodiment described in this application as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is provided to enable anyone skilled in the art to implement and use the present application. In the following description, details are listed for illustrative purposes. It should be understood that one of ordinary skill in the art will recognize that the present application can be implemented without these specific details. In other instances, well-known structures and processes are not described in detail to avoid obscuring the description of this application with unnecessary detail. Therefore, this application is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.

[0041] First, based on the content of the aforementioned background technology of this application, the background of the proposal of this application is further elaborated. To reduce the possibility of damage to components during testing of a test circuit, Chinese patent application publication number CN108072802A discloses a leakage test circuit with dual breakpoints. The circuit includes a test button, an indicator, a locking mechanism cooperating with the indicator, and first and second breakpoints connected to the test circuit. The first breakpoint is composed of a first conductive plate and a second conductive plate, and the second breakpoint is a microswitch. This patent utilizes the first conductive plate, the second conductive plate, and the microswitch to achieve dual breakpoint control, enabling timely disconnection of the test circuit when leakage current occurs. However, if the first and second conductive plates are provided over a small area, proper contact may not be achieved to close the first breakpoint. If the first and second conductive plates are provided over a large area, this is not conducive to miniaturization and integration of the circuit breaker. Furthermore, it is necessary to ensure that the first and second conductive plates are completely opposite to each other. Therefore, high requirements are placed on the size and position of the first and second conductive plates. Furthermore, the use of microswitches significantly increases costs. Therefore, to further improve the feasibility of dual-breakpoint circuit breakers and reduce the possibility of damage to components during testing of the test circuit, the present application is proposed.

[0042] First, as Figure 1 and Figure 2As shown, in one embodiment, the present application provides a leakage test assembly, which includes an electromagnetic release 1, a first follower 2, and a second follower 3. The electromagnetic release 1 includes a yoke 11, which is connected in series in a test circuit of a circuit breaker; the first follower 2 is arranged in series in the test circuit and is detachably abutted against the yoke 11 to form a first breakpoint in the test circuit, which is used to trigger the test circuit to be turned on; the second follower 3 is arranged in series in the test circuit and is detachably abutted against the yoke 11 to form a second breakpoint in the test circuit, which is used to disconnect the test circuit when the electromagnetic release 1 trips due to leakage current.

[0043] Separable abutment refers to the ability to separate in a natural state without external force and abut under external force, or to abut in a natural state without external force and separate under external force. For example, the first breakpoint can be configured to separate from the yoke 11 when no external force is applied and abut against the yoke 11 when an external force is applied. The second breakpoint can be configured to abut against the yoke 11 when no external force is applied and separate from the yoke 11 when an external force is applied. On the one hand, the yoke 11, as part of the electromagnetic release 1, occupies a large area in the circuit breaker. The first follower 2 and the second follower 3 can abut against the yoke 11 at any position, improving the reliability of the first and second breakpoints and providing greater flexibility in the installation positions of the first and second follower 2 and 3. On the other hand, by utilizing the existing yoke 11 in the circuit breaker to form the first and second breakpoints, there is no need for additional conductive or switching elements, significantly saving costs.

[0044] As an example, the test circuit includes a test resistor, the two ends of which can be connected to the neutral wire and the live wire respectively. The first breakpoint and the second breakpoint can be connected in series to either end of the test resistor at the same time, or can be connected in series to both ends of the test resistor respectively. The test resistor can be integrated on the circuit board of the circuit breaker, and then the test resistor on the circuit board can be connected to the first follower 2 and the second follower 3 respectively using wires. When the first breakpoint and the second breakpoint are closed at the same time, the test circuit is turned on, causing a short circuit between the neutral wire and the live wire to generate leakage current, thereby triggering the tripping of the electromagnetic release 1 to open the circuit breaker. When either the first breakpoint or the second breakpoint is disconnected or both are disconnected, the test circuit is disconnected, and no leakage current is generated at this time, and the circuit breaker can be closed and operate normally.

[0045] In the above embodiment, the yoke 11 in the electromagnetic release 1 is connected in series with the circuit breaker's test circuit as a conductive element. In the absence of external force, the first follower 2 and the yoke 11 naturally separate. When a leakage test is required, the test circuit is triggered to conduct by closing the first breakpoint. The second follower 3 is configured to abut the yoke 11 in the absence of external force, that is, to remain conductive in the absence of external force. This allows the test circuit to conduct immediately after the first breakpoint is closed, generating a leakage current. The electromagnetic release 1 then trips due to the leakage current, applying external force to the second follower 3, causing it to separate from the yoke 11, i.e., disconnecting the second breakpoint. This ensures that the test circuit can be quickly connected by closing the first breakpoint and reliably disconnected by the second breakpoint after the test is complete, thereby avoiding damage to other components in the circuit breaker caused by the continued conduction of the test circuit. Furthermore, the conductive property of the magnetic yoke 11 in the electromagnetic release 1 is utilized to form the first breakpoint and the second breakpoint, thereby saving costs and eliminating the need to provide additional switch elements in the test circuit.

[0046] Reference Figure 1 As a further implementation of the leakage test assembly, the leakage test assembly also includes a test button 4; the test button 4 is used to drive the first follower 2 to move toward the direction close to the yoke 11 when pressed until the first follower 2 and the yoke 11 abut against each other, thereby triggering the test circuit to be turned on.

[0047] As an example, the test button 4 can be movably mounted on the housing of the circuit breaker, with one end of the test button 4 extending out of the housing so that it can be pressed when a leakage test is required. A third spring 41 can also be provided on the housing of the circuit breaker. The third spring 41 is connected to the housing and the test button 4 to provide an elastic force to the test button 4 that causes it to extend out of the housing. When the test button 4 is pressed, it moves toward the interior of the housing, thereby driving the first follower 2 toward the yoke 11. When the external force pressing the test button 4 disappears, the test button 4 resets under the elastic force of the third spring 41, extending out of the housing of the circuit breaker and separating from the first follower 2.

[0048] As an embodiment of the first follower 2, the first follower 2 is arranged in the housing of the circuit breaker and is arranged opposite to the test button 4; the first follower 2 abuts against the yoke 11 when the test button 4 is pressed, and is separated from the yoke 11 when the test button 4 does not apply external force.

[0049] As an example, the first follower 2 includes a first elastic conductor sheet 21; one side of the first elastic conductor sheet 21 is connected to the test circuit circuit, which is also connected to a test resistor on the circuit board. The other side of the first elastic conductor sheet 21 extends near the yoke 11. The side of the first elastic conductor sheet 21 near the yoke 11 is bent in a direction opposite to the yoke 11 to form a contact portion 22, thereby ensuring stable contact and electrical conduction between the first elastic conductor sheet 21 and the yoke 11. The end surface of the first elastic conductor sheet 21 that extends obliquely toward the yoke 11 is disposed opposite the test button 4, so that when the test button 4 is pressed, it pushes the end surface of the first elastic conductor sheet 21 to move, causing the contact portion 22 on the first elastic conductor sheet 21 to abut against the yoke 11.

[0050] In the above embodiment, when a leakage test is required, the test button 4 is pressed to move the test button 4 toward the end surface of the first elastic conductor piece 21, so that the test button 4 pushes the first elastic conductor piece 21 to abut against the yoke 11, thereby closing the first breakpoint and achieving conduction of the test circuit.

[0051] Reference Figure 3 As an embodiment of the electromagnetic release 1, the electromagnetic release 1 further includes a coil 12, a moving iron core 13 and a first spring; wherein the yoke 11 is arranged on the outside of the coil 12, and the yoke 11 may be U-shaped, and the coil 12 is located in the U-shaped groove of the yoke 11; the moving iron core 13 is arranged coaxially with the coil 12, and is displaced toward the inner hollow portion of the coil 12 under the action of the electromagnetic force generated by energizing the coil 12, and a through hole is further provided on the yoke 11 for the moving iron core 13 to pass through; the first spring (not shown in the figure) is connected to the moving iron core 13 and is used to always apply an elastic force to the moving iron core 13 extending in the direction of the coil 12, that is, when the electromagnetic force generated by energizing the coil 12 is greater than the elastic force of the first spring, the moving iron core 13 begins to displace toward the inner hollow portion of the coil 12.

[0052] The yoke 11 is used to constrain and concentrate the magnetic field generated by the coil 12 when it is energized to the desired position to enhance the strength of the magnetic field. The yoke 11 can be made of ferromagnetic material, such as steel or nickel-iron alloy. By surrounding the yoke 11 on the outside of the coil 12, the magnetic field emitted by the coil 12 can be constrained to the maximum extent, thereby improving the efficiency of the magnetic field utilization, so as to provide a greater electromagnetic force to drive the movement of the moving iron core 13. In this embodiment, the yoke 11 also cooperates with the first follower 2 and the second follower 3, and uses its conductive properties to act as a conductor in series with the test circuit. When the test circuit is turned on, the yoke 11 is energized and generates a leakage current. At this time, the coil 12 is energized to drive the moving iron core 13 to trigger the circuit breaker to trip. The energized yoke 11 further strengthens the magnetic field distributed around the coil 12, thereby making the electromagnetic release 1 respond faster when a leakage current occurs.

[0053] Reference Figure 1 and Figure 4 As a further embodiment of the leakage test assembly, the leakage test assembly further includes an indicator 5 and a transmission structure 6 cooperating with the indicator 5; the indicator 5 is movably arranged on the housing of the circuit breaker, and a portion of the indicator 5 extends out of the housing. The movable iron core 13 of the electromagnetic release 1 is connected to the transmission structure 6, and is used to drive the transmission structure 6 to move when there is a leakage current, so as to trigger the tripping action of the circuit breaker and unlock the transmission structure 6 and the indicator 5, so that the indicator 5 drives the second follower 3 to move in a direction away from the yoke 11 until the second follower 3 is separated from the yoke 11 to disconnect the test circuit. The status of the indicator 5 includes unlocking and locking. When locked, the indicator 5 cannot move relative to the housing of the circuit breaker, that is, it cannot be pressed. When unlocked, the indicator 5 can be pressed.

[0054] As an embodiment of the second follower 3, the second follower 3 is arranged in the housing of the circuit breaker and is detachably abutted with one side of the indicator 5 located in the housing of the circuit breaker; the other side of the indicator 5 can extend out of the housing of the circuit breaker; wherein, when the circuit breaker is in the closed state, the second follower 3 is separated from the indicator 5 and abuts against the yoke 11; when the circuit breaker is in the open state, the second follower 3 abuts against the indicator 5 and is separated from the yoke 11.

[0055] As an embodiment of the indicator 5, the indicator 5 includes an indicator block 51, an abutment block 52, and a locking block 53; wherein the indicator block 51 can extend outside the housing of the circuit breaker, and a second spring 54 connected to the housing is provided in the indicator block 51, and the second spring 54 applies an elastic force to the indicator block 51 in a direction away from the magnetic yoke 11; the abutment block 52 is fixedly provided on the indicator block 51 and is detachably abutted with the second follower 3; as an example, the abutment block 52 is arranged opposite the second follower 3, and is separated from the second follower 3 when the circuit breaker is in the closed state, and is abutted with the second follower 3 when the circuit breaker is in the open state. The locking block 53 is fixedly provided on the indicator block 51 and cooperates with the transmission structure 6 to achieve locking or unlocking of the indicator 5.

[0056] Reference Figure 4As an embodiment of the transmission structure 6, the transmission structure 6 includes a hinged transmission plate 61; the end of the moving iron core 13 away from the coil 12 is connected to the transmission plate 61 to drive the transmission plate 61 to rotate along the hinge axis, and the transmission plate 61 rotates in the direction of approaching or away from the coil 12; a locking hole 62 is provided on the transmission plate 61, and the locking block 53 is detachably inserted into the locking hole 62 to lock or unlock the indicator 5. The transmission structure 6 also includes a mounting plate 63, which is fixedly connected to the transmission plate 61. The mounting plate 63 is used to install an actuator for driving the circuit breaker to trip, so as to control the closing and opening of the circuit breaker. The mounting plate 63 moves synchronously with the transmission plate 61, so that the control of the closing and opening of the circuit breaker is synchronized with the on-off control of the second breakpoint.

[0057] As an example, Figure 6 As shown, when the coil 12 is not energized, the first spring applies an elastic force to the movable iron core 13 in the direction of extending out of the coil 12. The locking block 53 is not inserted into the locking hole 62, but abuts against the transmission plate 61. The transmission plate 61 is limited by the locking block 53 and cannot move, so that the transmission plate 61 cannot drive the actuator of the circuit breaker to move, so that the circuit breaker cannot be closed. The circuit breaker is in the open state. At this time, the indicator 5 is in the unlocked state and the indicator 5 can be pressed. Figure 1 As shown, after the indicator 5 is pressed, relative movement occurs between the locking block 53 of the indicator 5 and the transmission plate 61 until the locking block 53 moves to the locking hole 62 on the transmission plate 61. At this time, the elastic force of the first spring drives the movable iron core 13 to extend in the direction away from the coil 12, so as to drive the transmission plate 61 to rotate, so that the locking block 53 passes through the locking hole 62, thereby achieving the locking of the indicator 5. At the same time, the transmission plate 61 also drives the mounting plate 63 to rotate, so that the mounting plate 63 drives the actuator to move and put the circuit breaker into the closed state.

[0058] Reference Figure 1 and Figure 2 As one embodiment of the second follower 3, the second follower 3 includes a second elastic conductor plate 32. A connecting portion 321 is formed on one side of the second elastic conductor plate 32 to connect to the test circuit circuit. An abutting portion 322 is formed on the other side of the second elastic conductor plate 32 and is disposed opposite the abutting block 52. The relative orientation is consistent with the direction of movement of the abutting block 52. For example, if the abutting block 52 moves vertically with the indicator block 51, the abutting block 52 and the abutting portion 322 are disposed opposite each other in the vertical direction. The end surface of the second elastic conductor plate 32 is in detachable abutment with the magnetic yoke 11. The abutting block 52 abuts the abutting portion 322 so that the abutting block 52 can drive the second elastic conductor plate 32 to move. The end surface of the second elastic conductor plate 32 is in detachable abutment with the magnetic yoke 11, allowing the abutting block 52 to drive the second elastic conductor plate 32 to move away from the magnetic yoke 11 until the end surface of the second elastic conductor plate 32 is separated from the magnetic yoke 11.

[0059] Reference Figure 1 and Figure 2 As a further embodiment of the leakage test assembly, a base stopper 33 is further provided on the circuit breaker housing. The base stopper 33 is located on the side of the second elastic conductor plate 32 near the connection portion 321 to limit the position of the second elastic conductor plate 32. The base stopper 33 can be cylindrical and is mounted to the circuit breaker housing via rivets. The curved side of the base stopper 33 contacts the end face of the second elastic conductor plate 32. When the abutment block 52 drives one side of the second elastic conductor plate 32 away from the yoke 11, the second elastic conductor plate 32 undergoes elastic bending deformation with the base stopper 33 as the axis away from the yoke 11, thereby separating the end face of the second elastic conductor plate 32 from the yoke 11. When the second elastic conductor plate 32 is not subjected to external force from the abutment block 52, the base stopper 33 allows the elastically bent second elastic conductor plate 32 to quickly return to a position in contact with the yoke 11.

[0060] In the above embodiment, the cooperation between the second elastic conductor piece 32 and the base stopper 33 enables the second elastic conductor piece 32 to stably separate from or abut against the yoke 11 , thereby achieving on / off control of the second breakpoint.

[0061] The present disclosure exemplarily describes the working process of the leakage test assembly:

[0062] Combine Figure 1 and Figure 2 , Figure 1 and Figure 2 The schematic diagram illustrates a state in which the circuit breaker is closed and working normally and the test circuit is not conductive. The first elastic conductor piece 21 and the magnetic yoke 11 are separated from each other, and the second elastic conductor piece 32 is in contact with the magnetic yoke 11, that is, the first break point is disconnected and the second break point is conductive, so the test circuit is not conductive.

[0063] Combine Figure 5 , Figure 5 The schematic diagram illustrates the test circuit being turned on and in the test state. Under the action of an external force, the test button 4 moves toward the first elastic conductor piece 21 and pushes the first elastic conductor piece 21 into contact with the magnetic yoke 11. At this time, the first breakpoint is turned on, so that the test circuit is turned on and leakage current begins to be generated. Since the coil 12 in the electromagnetic release 1 is energized to drive the moving iron core 13 to move, a certain response time is required, usually 10ms to 50ms. Therefore, during this process, the second breakpoint has not been opened, and the circuit breaker has not yet performed the tripping action and is in the closed state.

[0064] Combine Figure 6 and Figure 7 , Figure 6 and Figure 7 The schematic diagram of the test circuit test completion is shown as an example. After the leakage current exceeds the above-mentioned response time, the electromagnetic force generated by the coil 12 being energized drives the moving iron core 13 to displace toward the hollow space inside the coil 12, thereby driving the transmission plate 61 to rotate toward the coil 12. At this time, the locking block 53 is released from the locking hole 62. Under the elastic force of the second spring 54, the indicator 5 moves away from the locking hole 62, causing the locking block 53 to abut against the transmission plate 61. At the same time, during the movement, the locking block 53 drives the abutting block 52 toward the second elastic conductor plate 32. The abutting block 52 drives the second elastic conductor plate 32 to separate from the yoke 11, disconnecting the second breakpoint and disconnecting the test circuit, that is, completing the leakage test. At this time, even if the test button 4 is mistakenly pressed continuously to close the first breakpoint, the test circuit will not remain conductive, thereby protecting the components in the circuit breaker from damage by high current. In addition, when the transmission plate 61 rotates toward the coil 12 , the transmission plate 61 drives the mounting plate 63 to rotate together, so that the tripping mechanism installed on the mounting plate 63 performs a tripping action, thereby opening the circuit breaker.

[0065] Continue to combine Figure 1 and Figure 2 After the circuit breaker is opened, the locking block 53 abuts against the transmission plate 61, limiting the position of the transmission plate 61, so that the transmission plate 61 can no longer drive the actuator on the mounting plate 63 to restore the closed state. Therefore, it is necessary to press the indicator 5 at this time to make the locking block 53 pass through the locking hole 62, and the transmission plate 61 rotates in the direction away from the coil 12, so as to drive the actuator to complete the closing of the circuit breaker, that is, to restore the normal operation of the circuit breaker.

[0066] In a second aspect, in one embodiment, the present application provides a circuit breaker, which includes the leakage test assembly as described above.

[0067] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0068] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0069] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. A leakage test component, characterized in that: include: An electromagnetic release, comprising a magnetic yoke, wherein the magnetic yoke is connected in series in a test circuit of the circuit breaker; a first follower, arranged in series in the test circuit, detachably abutting against the magnetic yoke to form a first breakpoint of the test circuit, and used to trigger the test circuit to be turned on; The second follower is arranged in series in the test circuit and is detachably abutted against the magnetic yoke to form a second breakpoint of the test circuit, and is used to disconnect the test circuit when the electromagnetic release is tripped due to leakage current.

2. The leakage test assembly according to claim 1, characterized in that: Also includes a test button; The test button is used to drive the first follower to move toward the magnetic yoke when pressed, until the first follower and the magnetic yoke abut against each other, thereby triggering the test circuit to be turned on.

3. The leakage test assembly according to claim 2, characterized in that: The first follower is arranged in the housing of the circuit breaker and is arranged opposite to the test button; The first follower contacts the yoke when the test button is pressed, and is separated from the yoke when no external force is applied to the test button.

4. The leakage test assembly according to claim 2, characterized in that: The first follower includes a first elastic conductor sheet; One side of the first elastic conductor sheet is connected to the line of the test circuit, and the other side extends to the vicinity of the magnetic yoke and is bent to form a contact portion, and the end face of the first elastic conductor sheet is arranged opposite to the test button, so that the test button pushes the first elastic conductor sheet when pressed, so that the contact portion abuts against the magnetic yoke.

5. The leakage test assembly according to claim 1, characterized in that: It also includes an indicator and a transmission structure that cooperates with the indicator; The electromagnetic release is connected to the transmission structure and is used to drive the transmission structure to move when there is a leakage current, so as to trigger the tripping action of the circuit breaker and unlock the transmission structure and the indicator, so that the indicator drives the second follower to move in a direction away from the magnetic yoke until the second follower is separated from the magnetic yoke to disconnect the test circuit.

6. The leakage test assembly according to claim 5, characterized in that: The second follower is disposed in the housing of the circuit breaker and is detachably in contact with one side of the indicator located in the housing of the circuit breaker; the other side of the indicator can extend out of the housing of the circuit breaker; Wherein, when the circuit breaker is in a closed state, the second follower is separated from the indicator and abuts against the magnetic yoke; when the circuit breaker is in an open state, the second follower abuts against the indicator and is separated from the magnetic yoke.

7. The leakage test assembly according to claim 6, characterized in that: The indicator member includes an indicator block, an abutment block and a locking block; The indicating block may extend out of the housing of the circuit breaker, and a second spring connected to the housing is provided in the indicating block, and the second spring applies an elastic force to the indicating block in a direction away from the magnetic yoke; The abutment block is arranged on the indicating block and is arranged opposite to the second follower. When the circuit breaker is in a closed state, the abutment block is separated from the second follower, and when the circuit breaker is in an open state, the abutment block abuts against the second follower. The locking block is arranged on the indicating block and cooperates with the transmission structure to realize locking or unlocking of the indicating member.

8. The leakage test assembly according to claim 7, characterized in that: The second follower includes a second elastic conductor piece; A connecting portion is formed on one side of the second elastic conductor sheet and is connected to a circuit of the test circuit; An abutment portion is formed on the other side of the second elastic conductor piece and is arranged opposite to the abutment block. The end face of the second elastic conductor piece is detachably abutted against the magnetic yoke. The abutment block abuts against the abutment portion to drive the second elastic conductor piece to move away from the magnetic yoke until the end face of the second elastic conductor piece is separated from the magnetic yoke.

9. The leakage test assembly according to claim 8, characterized in that: The housing of the circuit breaker is further provided with a base limiting portion, and the base limiting portion is located on a side of the second elastic conductor piece close to the connecting portion to limit the second elastic conductor piece.

10. A circuit breaker, characterized in that: include: A leakage test assembly as claimed in any one of claims 1 to 9.

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