CN118053707A - Leakage circuit breaker - Google Patents

Abstract

The application discloses an electric leakage breaker, which comprises an operating mechanism, a main loop conductor, a zero sequence transformer, an electric leakage protection circuit and a release, wherein the operating mechanism is arranged on the main loop conductor; the secondary winding of the zero sequence transformer is connected with the leakage protection circuit; the leakage protection circuit is used for receiving the induction current from the secondary winding, and when the induction current reaches a leakage protection threshold value, the leakage protection circuit enables a coil of the release to electrically drive the release to work so that the operating mechanism drives the contact system to move to a breaking state; the zero sequence transformer also comprises a mechanical switch which connects two ends of the secondary winding of the zero sequence transformer in series, the mechanical switch is in a normally open state when not triggered, and is converted into a closed state after triggered; the mechanical switch is arranged near the operating mechanism or the contact system, and is triggered by the action of the operating mechanism or the contact system when the contact system is in a breaking state or in the process of changing the contact system to the breaking state; the application can realize the function of reverse wire feeding.

Description

Leakage circuit breaker

Technical Field

The application relates to the field of electricity, in particular to an electric leakage breaker.

Background

The earth leakage breaker has an earth leakage protection function, and is usually connected with a power supply and a load to form a loop, thereby playing a role in protecting the load. Circuit breakers typically have a power terminal for connection to a power source and a load terminal for connection to a load, with the main circuit contact assembly of the circuit breaker being connected between the power terminal and the load terminal, which of course is referred to herein as a circuit connection. In order to realize the earth leakage protection function, the earth leakage protection circuit often further comprises an earth leakage identification circuit and a release coil, and the earth leakage protection circuit often takes electricity on a load terminal of an earth leakage breaker. That is, if the residual current circuit breaker is normally wired (i.e., the power terminal is connected to the power source and the load terminal is connected to the load), when the residual current circuit breaker is disconnected, the release coil is also powered down due to the disconnection of the main circuit contact assembly (the electrical connection with the power terminal is in the disconnected state). Therefore, the release coil cannot be burnt out due to long-term energization in the case, and when no leakage occurs in the circuit, the loop of the release coil is not conducted; when the line leaks electricity, the release coil loop is conducted, and then the breaking of the main loop contact assembly of the main loop is cut off immediately (the current is originally from the power supply terminal to the main loop contact assembly and then to the release coil), so the possibility of long-term energizing of the release coil is avoided.

However, in some special environments or countries, such as the sat-arab area, they often require products to have an inverted line function, where the inverted line function means that the power supply terminals that should theoretically belong to the connected power supply are connected to the load in the actual circuit, and the load terminals that should theoretically belong to the connected load are connected to the power supply in the actual circuit. As a result of this connection, the residual current circuit breaker, after detecting the leakage, can originally rely on the main loop conductor to cut off the power supply so that the current on the trip coil loop disappears, which is not possible at present, because the current is directly passed from the load terminal to the trip coil. Thus, the release coil can be directly burnt out after long-time current bearing.

After the above-mentioned problems are found, a circuit structure of anti-reverse connection is designed by those skilled in the art, and a mechanical switch is connected in series on the loop of the tripper coil, and a linkage relationship exists between the mechanical switch and the main loop contact assembly, and only when the main loop contact assembly is communicated, the mechanical switch can be communicated to ensure the normal communication of the tripper coil, and when the main loop contact assembly is disconnected, the mechanical switch is disconnected. Thus, the requirements of the reverse wiring are met, and the structure is applied to the leakage protection circuit and the circuit breaker which can be connected in a forward and reverse mode, for example, the structure is disclosed in CN 216794600U.

The leakage identification circuit of the leakage protection circuit in the structure can still work to identify leakage current or can send a signal for triggering and conducting the release coil to the control loop of the release coil, only because the loop where the release coil is located is cut off by a mechanical switch and cannot be conducted, and the circuit with the inverted wire function has been in existence for many years.

Therefore, how to design a circuit breaker can directly promote the leakage protection circuit to be not operated (so to speak, the leakage current is not identified) when the circuit breaker is in breaking, so as to realize the reverse wire-feeding function, which is a direction worthy of research.

Disclosure of Invention

Therefore, the present application aims to overcome the defects in the prior art, and provides an electric leakage breaker, which has the characteristic of avoiding the leakage current from being identified by an electric leakage protection circuit when the electric leakage breaker is in a switching-off state.

The application provides an electric leakage breaker which comprises an operating mechanism, a main loop conductor, a zero sequence transformer, an electric leakage protection circuit and a release, wherein the operating mechanism is arranged on the main loop conductor; the main loop conductor comprises a contact system, and the contact system has an on state and an off state; the operating mechanism is connected with the contact system and is used for driving the contact system to move so as to change the state of the contact system; the primary winding of the zero sequence transformer is sleeved on the main loop conductor, and the secondary winding of the zero sequence transformer is connected with the leakage protection circuit; the coil of the release is a part of a leakage protection circuit, the leakage protection circuit is used for receiving the induction current from the secondary winding, and when the induction current reaches a leakage protection threshold value, the leakage protection circuit enables the coil of the release to electrically drive the release to work so that the operating mechanism drives the contact system to move to a breaking state; the zero sequence transformer also comprises a mechanical switch which connects two ends of the secondary winding of the zero sequence transformer in series, the mechanical switch is in a normally open state when not triggered, and is converted into a closed state after triggered; the mechanical switch is arranged near the operating mechanism or the contact system, and is triggered by the action of the operating mechanism or the contact system when the contact system is in a breaking state or in the process of changing the contact system to the breaking state.

The two ends of the secondary winding are connected in series with a mechanical switch, that is to say, the mechanical switch is in parallel connection with the leakage protection circuit in the circuit relation, and meanwhile, the mechanical switch is triggered by an operating mechanism or the contact system when the contact system is in a breaking state or in the process of changing the contact system to the breaking state. Even if the circuit breaker is of an inverted wire, when the circuit breaker is in a closing state, electric leakage occurs in the main circuit, the electric leakage protection circuit enables a coil of the release to be electrified, and the release works to enable the operating mechanism to drive the contact system to move to a breaking state; the operating mechanism or the contact system triggers the mechanical switch again, so that a short circuit is formed between the secondary winding and the mechanical switch (the induced current of the zero sequence transformer is very small, even if the short circuit does not damage the circuit here), the induced current will not flow into the leakage protection circuit any more, the leakage protection circuit will not recognize the leakage current, and the coil of the trip cannot get electricity any more (equivalent to being turned off). Only when the breaker is closed, the mechanical switch is restored to a normally open state, the induced current of the secondary winding can flow to the leakage protection circuit, and the leakage protection circuit can be normally used. The structure realizes the reverse wire inlet function by skillfully utilizing the linkage relation between the mechanical switch and the operating mechanism or the contact system, has very simple structure and can prevent the release coil from being burnt due to continuous work.

In some embodiments of the application, the operating mechanism is a molded case circuit breaker operating mechanism, the molded case circuit breaker operating mechanism comprising a frame, a handle, a lever, a trip, a latch, a rebuckle, an upper link, and a lower link; the mechanical switch is triggered by the handle or lever action when the contact system is in the breaking state or during the process of changing the contact system to the breaking state.

By adopting the structure, the circuit breaker is a molded case circuit breaker, and can be triggered by utilizing the handle or lever of the molded case circuit breaker when the circuit breaker is disconnected, the structure is easy to realize, and the transmission structure is simple and accurate.

In some embodiments of the application, the operating mechanism is a molded case circuit breaker operating mechanism, and the molded case circuit breaker operating mechanism comprises a frame, a handle, a lever, a trip button, a lock catch, a rebuckling, an upper connecting rod and a lower connecting rod, wherein the trip button is hinged with the frame through a hinge shaft, and a trigger piece is sleeved on the hinge shaft; when the contact system is in a breaking state or in the process of changing the contact system to the breaking state, the mechanical switch is triggered by the action of the trigger piece.

By adopting the structure, the circuit breaker is a molded case circuit breaker, and when the molded case circuit breaker operating mechanism is used for breaking, the hinge shaft of the trip buckle of the molded case circuit breaker rotates to drive the trigger piece to trigger, so that the circuit breaker is a novel trigger mode, and meanwhile, the circuit breaker is easy to realize, and the transmission structure is simple and accurate.

In some embodiments of the application, the operating mechanism is a miniature circuit breaker operating mechanism comprising a handle and a linkage; when the contact system is in a breaking state or in the process of changing the contact system to the breaking state, the mechanical switch is triggered by the action of the handle or the connecting rod.

By adopting the structure, the circuit breaker is a miniature circuit breaker, and can be triggered by utilizing the handle or the connecting rod of the miniature circuit breaker when the circuit breaker is disconnected, the structure is easy to realize, and the transmission structure is simple and accurate.

In some embodiments of the application, the contact system comprises a moving contact, a fixed contact, and a contact support; the contact support is in a rotating arrangement, the moving contact is arranged on the contact support and moves along with the contact support, and the operating mechanism is connected with the contact support to drive the contact system to move; the mechanical switch is triggered by the action of the moving contact or contact support.

By adopting the structure, no matter which breaker is, the contact system of the breaker comprises a moving contact, a fixed contact and a contact support, so that the breaker can be completely triggered by the moving contact or the contact support, and the breaker is simpler in structure and very accurate in transmission.

In some embodiments of the application, the operating mechanism or contact system effects triggering of the mechanical switch by acting directly on the mechanical switch; or, the device also comprises an intermediate piece, wherein the intermediate piece is in a rotating or sliding arrangement, the operating mechanism or the contact system acts on the intermediate piece, and the intermediate piece acts on the mechanical switch after deflecting or shifting so as to trigger the mechanical switch.

By adopting the structure, the mechanical switch can be triggered directly or indirectly, and the accurate triggering of the mechanical switch can be realized in any mode, so that comprehensive consideration can be fully carried out according to the arrangement position of the actual mechanical switch.

In some embodiments of the present application, the leakage protection circuit includes a leakage detection circuit and a leakage trip circuit; the leakage tripping circuit comprises a control switch and a tripper coil; the output end of the leakage detection circuit is connected with the control electrode of the control switch, the leakage detection circuit is used for receiving the induction current from the secondary winding, when the induction current reaches a leakage protection threshold value, the leakage detection circuit outputs a signal to the control electrode of the control switch, and the control switch is conducted to enable the release coil to be electrified; the control switch is one of an MOS tube, a silicon controlled rectifier and a triode.

In some embodiments of the application, the mechanical switch is a micro switch or a travel switch or a tact switch.

With this structure, the mechanical switch is selected in a large number, and can be selected according to the space allowance in the circuit breaker.

An electric leakage breaker comprises an operating mechanism, a main loop conductor, a zero sequence transformer, an electric leakage protection circuit and a magnetic flux release; the main loop conductor comprises a contact system, and the contact system has an on state and an off state; the operating mechanism is connected with the contact system and is used for driving the contact system to move so as to change the state of the contact system; the primary winding of the zero sequence transformer is sleeved on the main loop conductor, and the secondary winding of the zero sequence transformer is connected with the leakage protection circuit; the coil of the magnetic flux release is a part of a leakage protection circuit, the leakage protection circuit is used for receiving the induction current from the secondary winding, and when the induction current reaches a leakage protection threshold value, the release coil of the leakage protection circuit is electrically driven to work so that the operating mechanism drives the contact system to move to a breaking state; the zero sequence transformer also comprises a mechanical switch which connects two ends of the secondary winding of the zero sequence transformer in series, the mechanical switch is in a normally open state when not triggered, and is converted into a closed state after triggered; the mechanical switch is arranged near the magnetic flux release, and the mechanical switch is triggered when the magnetic flux release works.

The two ends of the secondary winding are connected with mechanical switches in series, namely the mechanical switches are in parallel connection with the leakage protection circuit in a circuit relation, and meanwhile, the mechanical switches are triggered when the magnetic flux release works. Even if the circuit breaker is of an inverted wire, when the circuit breaker is in a closing state, electric leakage occurs in the main circuit, the electric leakage protection circuit enables a coil of the magnetic flux release to be electrified, and the magnetic flux release works to enable the operating mechanism to drive the contact system to move to a breaking state; the mechanical switch is triggered when the magnetic flux release works, so that a short circuit is formed between the secondary winding and the mechanical switch (the induction current of the zero sequence transformer is very small, even if the short circuit does not damage a line, the induction current can not flow into the leakage protection circuit any more, the leakage protection circuit can not recognize leakage current, and the coil of the magnetic flux release can not be electrified (equivalent to being turned off). Only when the circuit breaker is closed (an operating mechanism of the circuit breaker can drive the magnetic flux release to reset, which is common knowledge in the field), the mechanical switch can be restored to a normally open state, the induced current of the secondary winding can flow to the leakage protection circuit, and the function of the leakage protection circuit can be normally used. The structure realizes the reverse wire feeding function by skillfully utilizing the linkage relation between the mechanical switch and the magnetic flux release, has a very simple structure and can prevent the magnetic flux release coil from being burnt due to continuous work.

In some embodiments of the application, the magnetic flux release effects triggering of the mechanical switch by acting directly on the mechanical switch; or, the magnetic flux release also comprises a middle piece which is rotatably arranged or slidably arranged, the magnetic flux release acts on the middle piece when working, and the middle piece acts on the mechanical switch after deflecting or shifting so as to trigger the mechanical switch.

By adopting the structure, the mechanical switch can be triggered directly or indirectly, and the accurate triggering of the mechanical switch can be realized in any mode, so that comprehensive consideration can be fully carried out according to the arrangement position of the actual mechanical switch.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 shows a schematic circuit diagram of an earth leakage breaker according to an embodiment of the present application (a mechanical switch is in a closed state);

FIG. 2 shows a schematic circuit diagram of the leakage breaker according to an embodiment of the present application (the mechanical switch is in a normally open state);

Figures 3-4 illustrate two different embodiments of the application employing a miniature circuit breaker operating mechanism to trigger a mechanical switch;

Figures 5-8 illustrate three different embodiments of the application for triggering a mechanical switch using a molded case circuit breaker operating mechanism;

FIG. 9 is a schematic diagram of the triggering of a mechanical switch using a miniature circuit breaker contact system of the present application;

FIG. 10 is a schematic diagram of the triggering mechanism of the present application using a molded case circuit breaker contact system;

FIG. 11 is a schematic diagram of the structure of the application employing a trip to trigger a mechanical switch;

FIG. 12 is a schematic diagram showing the structure of the application employing an operating mechanism to indirectly trigger a mechanical switch;

FIG. 13 shows a schematic of the structure of the application employing a contact system to indirectly trigger a mechanical switch;

fig. 14 shows a schematic of the structure of the application employing a release to indirectly trigger a mechanical switch.

Detailed Description

Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the application.

In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "electrically connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, directly connected, indirectly connected via an intermediate medium, or in communication between two elements or in an interaction relationship between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

Examples

As shown in fig. 1 to 14, an embodiment of the present application is an earth leakage breaker including an operating mechanism 10, a main loop conductor 20, a zero sequence transformer 30, an earth leakage protection circuit 40, a trip, and a mechanical switch 50.

The main loop conductor 20 is a carrier for the circuit breaker to be connected to withstand the current in the circuit to be protected. The main circuit conductor 20 here comprises a contact system 21, a power supply terminal, a load terminal and two groups of connecting conductors, wherein the contact system 21 is connected with the power supply terminal and the load terminal through the connecting conductors, the contact system 21 comprises a moving contact 22 and a fixed contact, the contact system 21 is in an on state (namely a circuit path to be protected) through the connection between the moving contact 22 and the fixed contact, and the contact system 21 is in an off state (namely an open circuit to be protected) through the separation of the moving contact 22 and the fixed contact. If a three-phase four-wire circuit breaker is used, the number of main loop conductors 20 is 4. If two-phase electricity is used, the number of main loop conductors 20 is 2.

The zero sequence transformer 30 comprises a primary winding and a secondary winding 31, wherein the primary winding is sleeved on all main loop conductors 20. When there is leakage current on the main loop conductor 20, the secondary winding 31 will develop an induced current and output.

The leakage protection circuit 40 is mainly configured to receive the induced current from the secondary winding 31, and when the induced current reaches a leakage protection threshold, the trip coil 43 is electrically driven to operate the trip, so that the operating mechanism 10 drives the contact 22 system 21 to move to a breaking state. The leakage protection circuit 40 mainly includes two parts, one is a leakage detection circuit 41 and the other is a leakage trip circuit 42. Here, the leakage detection circuit 41 mainly serves to determine whether or not the induced current reaches the leakage protection threshold. And the leakage trip circuit 42 includes a control switch 44, a trip coil 43, a rectifying circuit, and the like. The output end of the leakage detection circuit 41 is connected with the control electrode of the control switch 44, and the release coil 43 is connected with the other electrode of the control switch 44 in series. Here, the control switch 44 is a MOS transistor, and when the output signal of the leakage detection circuit 41 is supplied to the control electrode of the MOS transistor, the MOS transistor is turned on, so that the trip coil 43 is energized, and the trip works. When the signal on the control electrode disappears, the MOS tube is turned off. Of course, the MOS transistor can also be replaced by other control components, such as a thyristor, a triode, etc., and the lower circuit is only required to be slightly changed according to different characteristics of the components. The leakage protection circuit 40 formed by the leakage detection circuit 41, the MOS transistor, the thyristor, the triode, the trip coil 43, etc. is a common circuit in the art, and the detailed description of the overall circuit structure is omitted here.

The trip, which is a magnetic flux trip, includes a trip coil 43 and an actuating member (i.e., a push rod 44). When the release coil 43 is energized, the actuating member moves to cause the operating mechanism 10 to perform the opening operation (the operating mechanism 10 is in the closing state, but the closing state of the operating mechanism is broken due to the action of the actuating member, and the operating mechanism 10 is restored to the opening state).

The mechanical switch 50, here the mechanical switch 50 is a normally open switch. Similar such switches are micro switches, travel switches, tact switches, etc. In the present embodiment, the mechanical switch 50 is a micro switch. The micro switch is connected in series with two ends of the secondary winding 31 of the zero sequence transformer 30. When the mechanical switch 50 is in the normally open state, the induced current on the secondary winding 31 can flow to the leakage protection circuit 40. When the mechanical switch 50 is in the closed state, the mechanical switch 50 and the secondary winding 31 are in short circuit, and even if an induced current exists in the secondary winding 31, the induced current does not flow to the leakage protection circuit 40. The mechanical switch 50 is triggered in a plurality of ways according to the trigger components, and the following ways are classified:

in the first mode, the triggering is performed by the operating mechanism 10, and the following modes are classified:

As shown in fig. 3-4, taking the miniature circuit breaker operating mechanism 10 as an example, the miniature circuit breaker operating mechanism 10 generally includes a handle 11, a connecting rod 12, a trip buckle, a lock catch, and the like to form a four-bar linkage 12 mechanism, and the principle of the four-bar linkage 12 mechanism is common knowledge in the art and will not be described in detail. When the state of the small four-bar linkage 12 mechanism is changed, the positions of the handle 11 and the connecting bar 12 are moved. As shown in fig. 3, the mechanical switch 50 may be disposed near the handle 11 and within a track where the handle 11 rotates when the miniature circuit breaker operating mechanism 10 changes from a closed state to an open state, so that the handle 11 may trigger the mechanical switch 50 when changing from a closed state to an open state or when changing from a closed state to an open state (corresponding to when the contact system 21 is in an open state or when changing from the contact system 21 to an open state). Similarly, as shown in fig. 4, the mechanical switch 50 may be disposed near the link 12, and the principle of triggering is similar to that of the handle 11, but the mechanical switch is triggered by the link 12 instead, and will not be repeated here.

As shown in fig. 5-8, a molded case circuit breaker operating mechanism 10 is illustrated. Since the molded case circuit breaker operating mechanism 10 has a relatively large number of parts, there are also many parts capable of triggering the mechanical switch 50. The conventional molded case circuit breaker operating mechanism 10 includes a frame 13, a handle 11, a lever 15, a trip button 14, a latch, a rebuckle, an upper link, and a lower link, and the connection relationship and the transmission relationship of these components are all common knowledge in the art, and will not be described herein. As shown in fig. 6, the mechanical switch 50 may be disposed near the handle 11 and in the track where the handle 11 rotates when the molded case circuit breaker operating mechanism 10 changes from on to off, so that the handle 11 may trigger the mechanical switch 50 when changing from on to off or when changing from on to off (corresponding to when the contact system 21 is in the breaking state or when the contact system 21 is changing to the breaking state). As shown in fig. 7, the mechanical switch 50 may be disposed near the lever 15, and in the molded case circuit breaker, the swing angle of the lever 15 and the handle 11 is substantially similar, so that the mechanical switch 50 may be disposed within the movement locus of the lever 15, and the mechanical switch 50 may be triggered by the lever 15 when switching from on to off or during switching from on to off. As shown in fig. 8, the mechanical switch 50 may be driven by the hinge shaft 16 of the trip button 14, in the molded case circuit breaker, the trip button 14 is hinged to the frame 13 through the hinge shaft 16, and the hinge shaft 16 of the trip button 14 rotates during the state change of the operating mechanism 10, so that a trigger piece 17 may be sleeved at one end of the hinge shaft 16 of the trip button 14, and the mechanical switch 50 is triggered by the rotation of the trigger piece 17 along with the hinge shaft 16.

In the second mode, triggering is performed by the contact system 21, which is divided into the following modes:

As shown in fig. 9, the contact system 21 includes a moving contact 22, a fixed contact 23, and a contact support 24, taking a miniature circuit breaker as an example. The contact support 24 is rotatably connected with the shell through a rotating shaft, the operating mechanism 10 is connected with the contact support 24 to drive the contact 22 to support 24 to rotate, and the moving contact 22 is arranged on the contact support 24 to move along with the contact support 24. In this embodiment, the mechanical switch 50 is disposed near the contact support 24, specifically, the mechanical switch 50 is located in a track in which the contact support 24 rotates toward the breaking state, so that the mechanical switch 50 can be triggered to change its state when the contact support 24 is in the breaking state or during the rotation of the contact support 24 toward the breaking state. Likewise, the mechanical switch 50 may also be disposed near the motion track of the moving contact 22, and the triggering principle is similar to that of the contact support 24, but the moving contact 22 is used for triggering, which is not repeated herein.

As shown in fig. 10, taking a molded case circuit breaker as an example, the contact system 21 includes a moving contact 22, a fixed contact 23, and a contact support 24. The contact support 24 is also called a rotating shaft, the contact support 24 forms a rotating connection with the base, the operating mechanism 10 is connected with the contact support 24 to drive the contact 22 support 24 to rotate, and the movable contact 22 is arranged on the contact support 24 to move along with the contact support 24. In this embodiment, the mechanical switch 50 is disposed near the contact support 24, specifically, the mechanical switch 50 is located in a track in which the contact support 24 rotates toward the breaking state, so that the mechanical switch 50 can be triggered to change its state when the contact support 24 is in the breaking state or during the rotation of the contact support 24 toward the breaking state. Likewise, the mechanical switch 50 may also be disposed near the motion track of the moving contact 22, and the triggering principle is similar to that of the contact support 24, but the moving contact 22 is used for triggering, which is not repeated herein.

Mode three, trigger through the release:

As shown in fig. 11, taking a molded case circuit breaker as an example, the release is a magnetic flux release, and when the release coil 43 is energized, the push rod 44 of the magnetic flux release is actuated. The mechanical switch 50 may therefore be arranged on the path of movement of the push rod 44 of the magnetic flux release such that when the magnetic flux release is in operation, the push rod 44 will abut the mechanical switch 50 causing it to be triggered. As will be apparent to those skilled in the art, upon actuation of the flux trip, the operating mechanism 10 is transitioned to the tripped state, wherein the push rod 44 of the flux trip remains stationary; in the process of resetting the operating mechanism 10 (also referred to as the process of converting the operating mechanism 10 into the closed state), the push rod 44 of the magnetic flux release can be driven to reset, so that the mechanical switch 50 is restored to the normally open state.

The above is exemplified by the manner in which the operating mechanism 10, the trip unit, and the contact system 21 directly act on the mechanical switch 50, and indirect acting manners other than such direct acting manners may be adopted.

In the case of an indirect action, as shown in fig. 12, for example, a molded case circuit breaker, an intermediate member 60 is further provided between the handle 11 and the mechanical switch 50. The intermediate member 60 is provided for rotation, and the handle 11 can strike the intermediate member 60, so that the intermediate member 60 strikes the mechanical switch 50 again, thereby triggering the mechanical switch 50. Of course, such an intermediate piece 60 may be provided in a sliding arrangement. And in addition to striking the intermediate piece 60 with the handle 11, the lever 15 may be used to strike the intermediate piece 60.

As another indirect action, as shown in fig. 13, for example, a molded case circuit breaker may be provided with an intermediate member 60 that slides up and down within the movement track of the contact support 24. Triggering of the mechanical switch 50 may be achieved by rotating the strike intermediate piece 60 with the contact support 24 such that the intermediate piece 60 strikes the mechanical switch 50 again. Of course, such an intermediate member 60 may be provided in a rotational arrangement. And in addition to striking the intermediate piece 60 with the contact support 24, the moving contact 22 may be used to strike the intermediate piece 60.

As another indirect action, as shown in fig. 14, taking a molded case circuit breaker as an example, a middle piece 60 which is rotatably disposed in the motion track of the push rod 44 of the magnetic flux release may be disposed, and after the push rod 44 is actuated, the middle piece 60 may be impacted, so that the middle piece 60 may impact the mechanical switch 50 again, thereby triggering the mechanical switch 50.

In short, the mechanical switch 50 can be triggered in various ways, as long as the mechanical switch 50 can be triggered when the circuit breaker is in the off state.

Although the three-phase four-wire system leakage protection circuit breaker is shown in the embodiment, the invention concept can be applied to two-phase electric leakage protection circuit breakers, and can also play a role of reverse wire feeding.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.

Claims (10)

1. An electric leakage breaker comprises an operating mechanism, a main loop conductor, a zero sequence transformer, an electric leakage protection circuit and a release; the main loop conductor comprises a contact system, and the contact system has an on state and an off state; the operating mechanism is connected with the contact system and is used for driving the contact system to move so as to change the state of the contact system; the primary winding of the zero sequence transformer is sleeved on the main loop conductor, and the secondary winding of the zero sequence transformer is connected with the leakage protection circuit; the coil of the release is a part of a leakage protection circuit, the leakage protection circuit is used for receiving the induction current from the secondary winding, and when the induction current reaches a leakage protection threshold value, the leakage protection circuit enables the coil of the release to electrically drive the release to work so that the operating mechanism drives the contact system to move to a breaking state; the method is characterized in that: the zero sequence transformer also comprises a mechanical switch which connects two ends of the secondary winding of the zero sequence transformer in series, the mechanical switch is in a normally open state when not triggered, and is converted into a closed state after triggered; the mechanical switch is arranged near the operating mechanism or the contact system, and is triggered by the action of the operating mechanism or the contact system when the contact system is in a breaking state or in the process of changing the contact system to the breaking state.

2. The earth leakage breaker according to claim 1, characterized in that: the operating mechanism is a molded case circuit breaker operating mechanism, and the molded case circuit breaker operating mechanism comprises a frame, a handle, a lever, a jump buckle, a lock catch, a rebuckling, an upper connecting rod and a lower connecting rod; the mechanical switch is triggered by the action of the handle or lever when the contact system is in the breaking state or during the process of changing the contact system to the breaking state.

3. The earth leakage breaker according to claim 1, characterized in that: the operating mechanism is a molded case circuit breaker operating mechanism, and comprises a frame, a handle, a lever, a jump buckle, a lock catch, a rebuckling, an upper connecting rod and a lower connecting rod, wherein the jump buckle is hinged with the frame through a hinge shaft, and a trigger piece is sleeved on the hinge shaft; when the contact system is in a breaking state or in the process of changing the contact system to the breaking state, the mechanical switch is triggered by the action of the trigger piece.

4. The earth leakage breaker according to claim 1, characterized in that: the operating mechanism is a miniature circuit breaker operating mechanism, and the miniature circuit breaker operating mechanism comprises a handle and a connecting rod; when the contact system is in a breaking state or in the process of changing the contact system to the breaking state, the mechanical switch is triggered by the action of the handle or the connecting rod.

5. The earth leakage breaker according to claim 1, characterized in that: the contact system comprises a moving contact, a fixed contact and a contact support; the contact support is in a rotating arrangement, the moving contact is arranged on the contact support and moves along with the contact support, and the operating mechanism is connected with the contact support to drive the contact system to move; the mechanical switch is triggered by the action of the moving contact or contact support.

6. The earth leakage breaker according to claim 1, characterized in that: the operating mechanism or the contact system directly acts on the mechanical switch to trigger the mechanical switch; or, the device also comprises an intermediate piece which is in a rotating or sliding arrangement, the operating mechanism or the contact system acts on the intermediate piece, and the intermediate piece acts on the mechanical switch after deflecting or shifting so as to realize the triggering of the mechanical switch.

7. The earth leakage breaker according to claim 1, characterized in that: the leakage protection circuit comprises a leakage detection circuit and a leakage tripping circuit; the leakage tripping circuit comprises a control switch and a tripper coil; the output end of the leakage detection circuit is connected with the control electrode of the control switch, the leakage detection circuit is used for receiving the induction current from the secondary winding, when the induction current reaches a leakage protection threshold value, the leakage detection circuit outputs a signal to the control electrode of the control switch, and the control switch is conducted to enable the release coil to be electrified; the control switch is one of an MOS tube, a silicon controlled rectifier and a triode.

8. The earth leakage breaker according to claim 1, characterized in that: the mechanical switch is a micro switch or a travel switch or a tact switch.

9. An electric leakage breaker comprises an operating mechanism, a main loop conductor, a zero sequence transformer, an electric leakage protection circuit and a magnetic flux release; the main loop conductor comprises a contact system, and the contact system has an on state and an off state; the operating mechanism is connected with the contact system and is used for driving the contact system to move so as to change the state of the contact system; the primary winding of the zero sequence transformer is sleeved on the main loop conductor, and the secondary winding of the zero sequence transformer is connected with the leakage protection circuit; the coil of the magnetic flux release is a part of a leakage protection circuit, the leakage protection circuit is used for receiving the induction current from the secondary winding, and when the induction current reaches a leakage protection threshold value, the release coil of the leakage protection circuit is electrically driven to work so that the operating mechanism drives the contact system to move to a breaking state; the method is characterized in that: the zero sequence transformer also comprises a mechanical switch which connects two ends of the secondary winding of the zero sequence transformer in series, the mechanical switch is in a normally open state when not triggered, and is converted into a closed state after triggered; the mechanical switch is arranged near the magnetic flux release, and the mechanical switch is triggered when the magnetic flux release works.

10. The earth leakage breaker according to claim 9, characterized in that: the magnetic flux release directly acts on the mechanical switch to trigger the mechanical switch; or, the magnetic flux release also comprises a middle piece which is rotatably arranged or slidably arranged, the magnetic flux release acts on the middle piece when working, and the middle piece acts on the mechanical switch after deflecting or shifting so as to trigger the mechanical switch.