CN220796434U - Transformer secondary side open circuit protection structure and circuit breaker - Google Patents

Abstract

The utility model discloses a secondary side open circuit protection structure of a transformer and a circuit breaker, wherein the transformer comprises a transformer and a load, the transformer comprises a secondary side winding, and the load is in removable electrical connection with two ends of the secondary side winding; the device also comprises a normally closed switch and a triggering part for triggering the normally closed switch to switch the state of the normally closed switch; two ends of the normally closed switch are electrically connected with two ends of the secondary side winding, and when the load is removed, the normally closed switch and the secondary side winding form a loop; the triggering part is in linkage with the load, and after the load is installed, the triggering part triggers the normally closed switch to switch from the normally closed state to the on-off state; the utility model has the characteristics of high safety performance, stable structure and the like.

Description

Transformer secondary side open circuit protection structure and circuit breaker

Technical Field

The utility model relates to the technical field of low voltage, in particular to a breaker, and particularly relates to a secondary side open circuit protection structure of a transformer.

Background

The mutual inductor is widely applied to the field of electrical switches as a signal sampling structure. The structure principle is that a transformer is utilized to induce primary side current, and secondary side current is generated. Different functions are realized by different loads connected on the secondary side, for example, a switching power supply circuit is connected on the secondary side, and then the sampled induced current is used as a self-power supply circuit; for example, the secondary side connection protection component and the like, the induced current can be used for judging whether the primary side current is abnormal (short circuit, overload and the like) or not and is used for protection; for example, the secondary side is connected with the electric energy metering module, and the induced current can be used as the metering parameter of the metering module for metering the electric power.

The load is normally connected stably to the secondary side of the transformer. However, as the requirements of users are increasing, in some specific cases, the load may be made in a detachable structure, so that the user may remove the load for maintenance or replacement. At this time, the secondary side of the transformer will form an open circuit due to the removal of the load, and this open circuit will generate extremely high voltage at the two ends of the secondary side, and because the removable structure of the load must be set towards the user, there is a safety hazard.

Based on this, how to improve the safety performance is a direction worthy of research.

Disclosure of Invention

Therefore, the utility model aims to overcome the defects in the prior art, and aims to provide a secondary side open circuit protection structure of a transformer and a breaker, so as to ensure the electricity safety of a user.

The utility model provides a secondary side open circuit protection structure of a transformer, which comprises the transformer and a load, wherein the transformer comprises a secondary side winding, and the load is in removable electrical connection with two ends of the secondary side winding; the device also comprises a normally closed switch and a triggering part for triggering the normally closed switch to switch the state of the normally closed switch; two ends of the normally closed switch are electrically connected with two ends of the secondary side winding, and when the load is removed, the normally closed switch and the secondary side winding form a loop; the triggering part is in linkage with the load, and after the load is installed, the triggering part triggers the normally closed switch to switch from the normally closed state to the on-off state.

By adopting the structure, even if the load is pulled out, the two ends of the secondary side winding and the normally closed switch form a loop due to the existence of the normally closed switch, so that the open circuit condition is avoided, and the potential safety hazard caused by the open circuit is solved. And because the trigger part is arranged in linkage with the load, after the load is installed, the trigger part can trigger the normally closed switch to open the normally closed switch, and at the moment, the load and the secondary side winding form a loop.

In some embodiments of the present utility model, the transformer further comprises two first plug-ins and two second plug-ins, the two first plug-ins are respectively electrically connected with two ends of the secondary winding, the two second plug-ins are electrically connected with the load, and the first plug-ins and the second plug-ins cooperate to realize removable electrical connection between the load and the transformer.

By adopting the structure, the connector is utilized to realize removable electrical connection between the load and the transformer, and the structure has the characteristics of convenience in disassembly and assembly and the like.

In some embodiments of the present utility model, the two first plug-ins are provided with conductive elastic pieces, and the two conductive elastic pieces contact to form the normally closed switch; the triggering part is an insulating part, and after the load is installed, the triggering part pushes the two conductive elastic pieces to move or pushes one of the conductive elastic pieces to move so as to separate the two conductive elastic pieces.

By adopting the structure, the normally-closed switch is formed by the conductive elastic sheet on the connector without additionally adding the normally-closed switch, and the connector has the characteristics of simple structure, high cost performance and the like.

In some embodiments of the present utility model, the device further comprises a first insulating housing on which the two first inserts are disposed and a second insulating housing on which the two second inserts are disposed, the trigger portion being disposed; the first insulating shell is provided with a first channel which is used for accommodating the conductive elastic sheet and allowing the trigger part to penetrate.

By adopting the structure, the connector with the insulating shell can be used for protecting the conductive elastic sheet.

In some embodiments of the utility model, two conductive spring plates are bent towards each other to form a normally closed switch; or/and one side of the contact ends of the two conductive elastic sheets forms an open structure, and the trigger part enters from the open structure to separate the contact of the two conductive elastic sheets.

By adopting the structure, the normally closed switch is formed by simultaneously bending and contacting the two conductive elastic sheets, and the device has the characteristic of convenient processing. The design of the open structure is adopted, so that the trigger part can enter between the two conductive elastic sheets to separate the two conductive elastic sheets.

In some embodiments of the present utility model, the first insert further includes a pin portion, a body portion, and a clamping portion, where the pin portion and the clamping portion are connected by the body portion, and the conductive elastic sheet is connected to the body portion and located at one side of the clamping portion; the lead part is used for being electrically connected with the secondary side winding, and the clamping part is used for being matched with the second plug-in.

With this construction, the design of the pin portion, the body portion and the clamping portion will facilitate the formation of such inserts and their connection to the corresponding components.

In some embodiments of the present utility model, the body portion further includes a guide portion extending to one side of the clamping portion, the guide portion and the conductive elastic sheet are separately disposed at different sides of the clamping portion, and the guide portion is leveled with or exceeds the clamping portion; the guide portion is provided with a guide surface at one end thereof away from the body portion.

By adopting the structure, the design of the guide part guides and limits the second plug-in unit when the second plug-in unit enters, and is beneficial to the second plug-in unit to reach a proper position for forming stable fit with the clamping part.

In some embodiments of the utility model, the body portion includes a bottom wall, two side walls, and a folded wall; the two side walls are connected to the two sides of the bottom wall to form a U-shaped structure, and the clamping parts are connected to the two side walls; the bending wall is connected to one side wall, and the conductive elastic sheet is connected to the bending wall.

By adopting the structure, the processing and forming of the clamping part and the conductive elastic sheet are facilitated, and the structure is more compact and simplified.

A circuit breaker comprising a circuit breaker body and an electronic module removably disposed with the circuit breaker body; the transformer secondary side open circuit protection structure further comprises the transformer secondary side open circuit protection structure, and the load is an electronic module; the relationship of the transformer and the electronic module is one of the following: in one aspect, the electronic module includes a self-generated power supply, and the transformer is a sampling part of the self-generated power supply; the second case is that the electronic module comprises a metering module, and the transformer provides power parameters for the metering module; in a third aspect, the electronic module includes a protection module, and the transformer provides power parameters for the protection module.

Because the mutual inductor has a lot of use modes in the circuit breaker, the mutual inductor can be used in a self-generated power supply environment, and can also be used in the situations of electric quantity measurement, instantaneous protection, overload protection and the like, and the mutual inductor in any situation can adopt the open circuit protection structure, so that the effect of safety is achieved.

A circuit breaker comprising a circuit breaker body and an electronic module removably disposed with the circuit breaker body; the electronic module comprises a metering module and a protection module; the transformer secondary side open circuit protection structure further comprises two groups of the transformer secondary side open circuit protection structures, and the load is an electronic module; one group of the transformers of the protection structure provides power parameters for the metering module, and the other group of the transformers of the protection structure provides power parameters for the protection module.

By adopting the structure, the open circuit protection structure is applied to the circuit breaker with protection (instantaneous protection and/or overload protection) and electric quantity measurement functions so as to solve the potential safety hazard caused by plugging and unplugging of the electronic module.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, 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 utility model 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.

FIGS. 1A-1B show schematic diagrams of the transformer, normally closed switch, and load connected or disconnected according to embodiment 1 of the present utility model;

FIGS. 2A-2B are diagrams showing the relationship between a normally closed switch and a trigger portion according to a preferred embodiment of example 1 of the present utility model;

figures 3A-3B illustrate a variant of the first insert of a preferred embodiment of example 1 of the present utility model;

FIG. 4 shows a cross-sectional view of the first and second inserts in a preferred embodiment of example 1 of the present utility model;

FIG. 5 is a schematic view showing the structure of a first card in a preferred embodiment of example 1 of the present utility model;

fig. 6 is a schematic diagram showing a circuit breaker using the open circuit protection structure of embodiment 1 of the present utility model as a self-generated power source;

fig. 7 shows a schematic diagram of a circuit breaker for implementing a metering function by using the open circuit protection structure in embodiment 1 of the present utility model;

fig. 8 shows a schematic diagram of a circuit breaker for implementing a protection function by applying the open circuit protection structure in embodiment 1 of the present utility model;

fig. 9-10 show schematic diagrams of a circuit breaker for implementing a metering function and a protection function by using the open circuit protection structure in embodiment 1 of the present utility model.

Detailed Description

Embodiments of the present utility model 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 utility model.

In the description of the present utility model, 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 utility model 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 utility model.

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 utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "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 intervening medium, or in communication between two elements or in an interaction relationship between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, 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

Referring to fig. 1A to 10, a secondary side open circuit protection structure of a transformer 1 is disclosed, which can be applied not only to a circuit breaker but also to other cases where sampling current is performed by using the transformer 1. The protection structure may be applied to any case where the load 2 and the transformer 1 are electrically connected to each other so as to be detachable and the secondary winding 11 needs to be protected. The removable electrical connection may be in the form of a connector or in the form of a terminal (screw terminal, cage terminal) or the like.

This protective structure comprises a transformer 1, a load 2 and a normally closed switch 3.

The transformer 1 includes a magnetic ring (iron core) and a secondary side winding 11 wound around the magnetic ring, a center hole of the magnetic ring being used for passing a conductor of a main circuit (primary side). When a current flows through the conductor of the main circuit (primary side), the secondary winding 11 generates an induced current.

The load 2 is electrically connected to both ends of the secondary winding 11 to form a loop. Depending on the specific form of the load 2, the induced current generated by the secondary winding 11 may be used by the load 2 to perform different functions. For example, as a control circuit of the switching device, the induced current generated by the secondary side winding 11 may form a self-generated power supply C with a power supply circuit, thereby being used by the control circuit. For another example, the load 2 is a metering module E with a metering chip, and the induced current generated by the secondary winding 11 is calculated by the metering module E to obtain a power parameter for a user. Besides, the circuit can also be used as a protection circuit (overload protection, short-circuit protection and the like) of a switch, the load 2 at the moment is the protection module P, the induced current generated by the secondary side winding 11 is judged by the protection module P for use, and whether the current of the conductor of the main circuit (primary side) is abnormal or not is judged, if so, the breaking protection can be carried out, and the user is reminded.

As shown in fig. 1B, the normally closed switch 3 is in an on state in a normal state, and is switched to an off state in a triggered state. In the present embodiment, the two ends of the normally closed switch 3 are connected to the two ends of the secondary winding 11, so that when the load 2 is removed, the two ends of the secondary winding 11 and the normally closed switch 3 form a loop due to the characteristics of the normally closed switch 3, thereby preventing the open circuit.

As shown in fig. 1A, since the trigger portion 51 of the normally closed switch 3 is provided in conjunction with the load 2, the trigger portion 51 triggers the normally closed switch 3 to be turned into an open state after the load 2 is mounted, so that a stable loop can be formed between the load 2 and the secondary winding 11. Of course, the linkage arrangement here includes both the case of being driven directly by the load 2 and the case of being driven indirectly by the load 2. Taking the case of being directly driven by the load 2 as an example, the trigger portion 51 is directly fixed on the load 2, and the trigger portion 51 moves with the installation and removal of the load 2. Taking the situation of being indirectly driven by the load 2 as an example, a transmission pair exists between the load 2 and the triggering part 51, the load 2 is used as a power source to realize the structure that the triggering part 51 moves or rotates to trigger the normally closed switch 3 through the transmission pair, and the structure formed by the transmission pair can be a connecting rod sliding block mechanism, a crank rocker mechanism, a crank sliding block mechanism, a connecting rod transmission structure, a gear transmission structure and the like.

The following description is given of the working principle of a preferable normally closed switch 3 and a trigger portion 51:

as shown in fig. 2A-5, two ends of the secondary winding 11 are respectively connected with a first plug-in unit 4, two second plug-in units 5 are electrically connected to the load 2, and the first plug-in unit 4 and the second plug-in units 5 cooperate to realize removable electrical connection between the load 2 and the transformer 1; in this embodiment, the two first inserts 4 are each provided with a conductive dome 31, the two conductive domes 31 being in contact under normal conditions forming a so-called normally closed switch 3. And an insulating member is fixed on the load 2 as a trigger portion 51, and when the load 2 is installed, the trigger portion 51 pushes one of the conductive elastic pieces 31 to move or pushes both of the conductive elastic pieces 31 to move, so that the two conductive elastic pieces 31 are separated (corresponding to the switching of the normally closed switch 3 to the on state). In many forms of separating the two conductive elastic pieces 31 by pushing the conductive elastic pieces 31 by the trigger portion 51, as illustrated in fig. 2B, the two conductive elastic pieces 31 are bent and contacted towards each other, and after the trigger portion 51 moves, the two conductive elastic pieces 31 are inserted between the two conductive elastic pieces, so as to achieve the effect of separating the two conductive elastic pieces 31. Taking fig. 3A-3B as an example, as a modified embodiment, one of the conductive elastic pieces 31 is located at the front part of the other conductive elastic piece 31 to form contact, and when the trigger part 51 moves, the rear conductive elastic piece 31 is driven to move backwards so as to achieve the effect of separating the two conductive elastic pieces 31.

In order to facilitate the triggering portion 51 to push the conductive spring piece 31 to separate the two conductive spring pieces 31, an open structure 31a is formed at one side of the contact end of the conductive spring piece 31, and the triggering portion 51 enters from the open structure 31a to block the contact of the two conductive spring pieces 31.

To facilitate the production, manufacturing, assembly of the first and second inserts 4, 5, the first insert 4 is provided on the first insulating housing 41a, and the second insert 5, the triggering portion 51 is provided on the second insulating housing 51 a. A first channel 41b is provided in the first insulating housing 41a, the conductive dome 31 is in the first channel 41b, and the trigger portion 51 penetrates into the first channel 41b when the conductive dome 31 is triggered. The first insulating housing 41a is also provided with a second channel 41c, and when the first plug-in unit 4 and the second plug-in unit 5 are matched to form the electrical connection between the load 2 and the transformer 1, the matching position of the two is located in the second channel 41 c.

In order to facilitate the production of the first insert 4, the first insert 4 includes a lead portion 41, a body portion, and a clamping portion 42, where the lead portion 41 and the clamping portion 42 are connected by the body portion, and the conductive elastic sheet 31 is connected to the body portion and located at one side of the clamping portion 42. The lead portion 41 is electrically connected to the secondary winding 11, and the clamping portion 42 is engaged with the second plug 5. The body portion includes a bottom wall 431, two side walls 432 and a bending wall 433, the two side walls 432 are connected to two sides of the bottom wall 431 to form a U-shaped structure, the clamping portion 42 (two clamping pieces) is connected to the two side walls 432, the bending wall 433 is connected to one of the side walls 432, and the conductive elastic sheet 31 is connected to the bending wall 433. The bottom wall 431 is further provided with a guide portion 44 (the guide portion 44 and the conductive spring piece 31 are separately provided on different sides of the clamping portion 42), the guide portion 44 extends from the bottom wall 431 toward the clamping portion 42, the guide portion 44 extends beyond the clamping portion 42 or is flush with the clamping portion 42, and a guide surface 441 is provided on an end of the guide portion 44 away from the body portion. The guide surface 441 is a slope or a cambered surface.

The above-mentioned example is a preferred normally closed switch 3 and the triggering part 51, but other variant embodiments are also provided, for example, the normally closed switch 3 is not in the form of a spring plate but in the form of a separate tact switch, a micro switch or the like. For another example, the conductive spring piece 31 may be integrally formed with the first insert 4, or may be engaged with the first insert 4 by riveting, screwing, interference fit, welding, or the like.

The embodiments of the open circuit protection structure described above can be applied to circuit breakers, and the following examples are given for the application to circuit breakers.

Taking the transformer 1 and the load 2 as examples, as shown in fig. 6, a circuit breaker includes a breaker body B and an electronic module M removably disposed with the breaker body B. At this time, the load 2 of the protection structure is an electronic module M, and the electronic module M includes a self-generating power source C, and the transformer 1 is used as a sampling portion of the self-generating power source C for the transformer 1. The circuit principle of the self-generated power supply C is well known in the field of circuit breakers, and the utility model is not an improvement on the circuit principle of the self-generated power supply C, but expresses that the open circuit protection structure can be applied to the self-generated power supply C of the circuit breaker.

Taking the transformer 1 and the load 2 as metering usage as an example, as shown in fig. 7, a circuit breaker comprises a circuit breaker body B and an electronic module M removably arranged with the circuit breaker body B. At this time, the load 2 of the protection structure is an electronic module M, and the electronic module M includes a metering module E, and the electric power parameter sampled by the transformer 1 is calculated by the metering module E to obtain an electric power parameter for a user to use. The utility model is not an improvement on the principle of the power metering mode, but expresses that the open circuit protection structure can be applied to the power metering of the circuit breaker.

Taking the transformer 1 and the load 2 as protection functions, as shown in fig. 8, a circuit breaker includes a circuit breaker body B and an electronic module M removably disposed with the circuit breaker body B. At this time, the load 2 of the protection structure is an electronic module M, and the electronic module M includes a protection module P, and the power parameter sampled by the transformer 1 is judged by the protection module P, so that whether the current of the conductor of the main circuit (primary side) is abnormal or not can be used for breaking protection of the circuit breaker or reminding a user if the current is abnormal. The protection module P (overload protection, short-circuit protection) is a known technology in the field of circuit breakers, and the utility model is not an improvement in terms of the principle of protection function, but by which the above-mentioned open circuit protection structure is expressed and can be applied to the protection function of the circuit breaker.

Of course, in addition to the above single-function application, the circuit breaker can also be applied to some circuit breakers having a plurality of functions in combination, as shown in fig. 9 to 10, a circuit breaker including a circuit breaker body B and an electronic module M removably disposed with the circuit breaker body B. The load 2 of the protection structure is an electronic module M, and the electronic module M includes a protection module P and a metering module E. The transformers 1 are divided into two groups of transformers 1, wherein one group of transformers 1 is a protection transformer 101, the other group of transformers 1 is a metering transformer 102, and the protection transformers 101 and the metering transformers 102 adopt the open circuit protection structures. The power parameters sampled by the metering transformer 102 are calculated by the metering module E to obtain power parameters for use by a user. The protection module P judges whether the current of the conductor of the main circuit (primary side) is abnormal or not according to the electric power parameter sampled by the protection transformer 101, if so, the breaking protection of the circuit breaker can be carried out or the user can be reminded. The number of the protection transformers 101 and the number of the measurement transformers 102 are also determined according to the number of conductors of the main circuit (primary side), and in this embodiment, four.

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 utility model. 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 utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, 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 utility model.

Claims (10)

1. The utility model provides a transformer secondary side open circuit protective structure, it includes transformer and load, and the transformer includes secondary side winding, and load and secondary side winding's both ends are removable electric connection; the method is characterized in that: the device also comprises a normally closed switch and a triggering part for triggering the normally closed switch to switch the state of the normally closed switch; two ends of the normally closed switch are electrically connected with two ends of the secondary side winding, and when the load is removed, the normally closed switch and the secondary side winding form a loop; the triggering part is in linkage with the load, and after the load is installed, the triggering part triggers the normally closed switch to switch from the normally closed state to the on-off state.

2. The transformer secondary side open circuit protection structure of claim 1, wherein: the transformer also comprises two first plug-ins and two second plug-ins, wherein the two first plug-ins are respectively electrically connected with two ends of the secondary side winding, the two second plug-ins are electrically connected with the load, and the first plug-ins and the second plug-ins are matched to realize removable electrical connection between the load and the transformer.

3. The transformer secondary side open circuit protection structure of claim 2, wherein: the two first plug-in components are provided with conductive elastic pieces, and the two conductive elastic pieces are contacted to form the normally closed switch; the triggering part is an insulating part, and after the load is installed, the triggering part pushes the two conductive elastic pieces to move or pushes one of the conductive elastic pieces to move so as to separate the two conductive elastic pieces.

4. A transformer secondary side open circuit protection structure according to claim 3, wherein: the device further comprises a first insulating shell and a second insulating shell, wherein two first plug-ins are arranged on the first insulating shell, two second plug-ins are arranged on the second insulating shell, and a trigger part is arranged on the second insulating shell; the first insulating shell is provided with a first channel which is used for accommodating the conductive elastic sheet and allowing the trigger part to penetrate.

5. A transformer secondary side open circuit protection structure according to claim 3, wherein: the two conductive spring plates are bent towards the direction of the opposite side to contact to form a normally closed switch; or/and one side of the contact ends of the two conductive elastic sheets forms an open structure, and the trigger part enters from the open structure to separate the contact of the two conductive elastic sheets.

6. A transformer secondary side open circuit protection structure according to claim 3, wherein: the first plug-in unit also comprises a pin part, a body part and a clamping part, wherein the pin part is connected with the clamping part through the body part, and the conductive elastic sheet is connected to the body part and is positioned at one side of the clamping part; the lead part is used for being electrically connected with the secondary side winding, and the clamping part is used for being matched with the second plug-in.

7. The transformer secondary side open circuit protection structure of claim 6, wherein: the body part is also provided with a guide part extending to one side of the clamping part, the guide part and the conductive elastic sheet are respectively arranged at different sides of the clamping part, and the guide part is leveled with or exceeds the clamping part; the guide portion is provided with a guide surface at one end thereof away from the body portion.

8. The transformer secondary side open circuit protection structure of claim 6, wherein: the body part comprises a bottom wall, two side walls and a bending wall; the two side walls are connected to the two sides of the bottom wall to form a U-shaped structure, and the clamping parts are connected to the two side walls; the bending wall is connected to one side wall, and the conductive elastic sheet is connected to the bending wall.

9. A circuit breaker comprising a circuit breaker body and an electronic module removably disposed with the circuit breaker body; the method is characterized in that: the transformer secondary side open circuit protection structure according to any one of claims 1-8, wherein the load is an electronic module; the relationship of the transformer and the electronic module is one of the following: in one aspect, the electronic module includes a self-generated power supply, and the transformer is a sampling part of the self-generated power supply; the second case is that the electronic module comprises a metering module, and the transformer provides power parameters for the metering module; in a third aspect, the electronic module includes a protection module, and the transformer provides power parameters for the protection module.

10. A circuit breaker comprising a circuit breaker body and an electronic module removably disposed with the circuit breaker body; the electronic module comprises a metering module and a protection module; the method is characterized in that: the transformer secondary side open circuit protection structure further comprises two groups of transformer secondary side open circuit protection structures according to any one of claims 1-8, wherein the load is an electronic module; one group of the transformers of the protection structure provides power parameters for the metering module, and the other group of the transformers of the protection structure provides power parameters for the protection module.