CN220171914U - Mutual inductor module and circuit breaker - Google Patents

Abstract

The transformer module includes a first transformer, the first transformer is connected to the main line of the circuit breaker, and a second transformer, the main line of the circuit breaker branches off a branch line, and the second transformer is connected to In the case of a branch line, the current flowing through the branch line is less than the current flowing through the main line of the circuit breaker. A circuit breaker includes a housing and at least one conductive system arranged in the housing. The conductive system includes a pair of wiring components and a transformer module. A one-phase main line of the circuit breaker is connected between the pair of wiring components. The transformer module Set between a pair of wiring components. In the utility model, the first transformer and the second transformer are respectively connected to the main line and the branch line. The branch line shunts a smaller current from the main line to avoid the overall problem caused by a large current flowing through both transformers. If the temperature rises too high, it will help improve the performance of the transformer module.

Description

Transformer modules and circuit breakers

Technical field

The utility model relates to the field of low-voltage electrical appliances, and specifically relates to a transformer module and a circuit breaker.

Background technique

A circuit breaker is a switching device that can close, carry and interrupt current under normal or abnormal circuit conditions. According to its structure, it can be divided into universal circuit breaker and molded case circuit breaker. Among existing molded case circuit breakers, usually The measurement and protection functions are implemented by current transformers. However, because the current transformers that implement the measurement and protection functions are usually integrated into one body, and the rated current is relatively large, the self-heating test temperature of the current transformer is relatively high, resulting in Current transformer performance degrades.

Contents of the invention

The purpose of this utility model is to overcome at least one defect of the prior art and provide a transformer module and circuit breaker that has a simple structure, high reliability and is conducive to reducing the self-heating of the transformer.

In order to achieve the above purpose, the utility model adopts the following technical solutions:

The utility model provides a transformer module, which includes a first transformer connected to a main line of a circuit breaker, and a second transformer. The main line of the circuit breaker branches off a branch line. The second transformer is connected to the branch line, and the current flowing through the branch line is smaller than the current flowing through the main line of the circuit breaker.

Further, the second transformer is connected in parallel with the first transformer through a branch line, and the second transformer is located on one side of the first transformer.

Further, a first conductive member is included, the first conductive member is connected in series to the main line of the circuit breaker, and the first conductive member passes through the central hole of the first transformer.

Furthermore, a second conductive member is further included, and the two ends of the second conductive member passing through the central hole of the second transformer are electrically connected to the two ends of the first conductive member respectively.

Further, the cross-sectional area of the second conductive member is smaller than the cross-sectional area of the first conductive member.

Further, the second conductive member and the second transformer are located on the same side of the first conductive member, and the middle part of the second conductive member passes through the center hole of the second transformer and spans all Describe the first transformer.

Further, the first conductive member is a connecting plate, and the second conductive member is a soft connection.

The utility model also provides a circuit breaker, which includes a shell and at least one conductive system arranged in the shell. The conductive system includes a pair of wiring components, and a one-phase main line of the circuit breaker is connected between the pair of wiring components. , further including a transformer module as described above, which is disposed between a pair of wiring components.

Preferably, a third transformer is also included, and at least one phase main line is connected to the third transformer for detecting leakage signals.

Preferably, it also includes a control module and a tripper. The control module at least includes a circuit board and a controller connected to the circuit board. The control module is connected to the second transformer for metering. The control module is connected to the first transformer and the tripper. The control module triggers the tripper based on the signal collected by the first transformer for overload or short-circuit protection.

In the transformer module and circuit breaker of the present invention, the first transformer and the second transformer are respectively connected to the main line and the branch line, in which the branch line shunts a smaller current from the main line to avoid the flow of both transformers. Excessive current will cause the overall temperature to rise too high, which will help improve the performance of the transformer module.

In addition, the cross-sectional area of the second conductive member is smaller than the cross-sectional area of the first conductive member, which facilitates the realization that the current flowing through the branch line is smaller than the current flowing through the main line.

In addition, both ends of the second conductive member are respectively connected to both ends of the first conductive member, and the middle part of the second conductive member passes through the center hole of the second transformer and spans the first transformer. In particular, the first conductive member It is a connecting plate, and the second conductive part is a soft connection, which has the advantages of small space occupation, easy assembly and convenient wiring.

Description of drawings

Figure 1 is a schematic structural diagram of the moving contact and transformer module in the present utility model;

Figure 2 is a schematic structural diagram of the second transformer and the first transformer separated in the present utility model;

Figure 3 is a schematic structural diagram of the first transformer and the first conductive member in the present utility model;

Figure 4 is a schematic structural diagram of the second transformer and the second conductive member in the utility model;

Reference signs: 1-first transformer, 2-second transformer, 3-first conductive member, 4-second conductive member, 5-moving contact.

Detailed ways

The specific implementation manner of the circuit breaker of the present invention will be further described below with reference to the embodiments given in the accompanying drawings. The circuit breaker of the present invention is not limited to the description of the following embodiments.

The circuit breaker includes a shell, and at least one conductive system is provided inside the shell. Each conductive system includes a pair of wiring components and a contact mechanism. A one-phase main line of the circuit breaker is connected between the pair of wiring components. The contact mechanism includes The movable contact 5 and the static contact match each other. The movable contact 5 is electrically connected to one wiring component, and the static contact is electrically connected to another wiring component. The movable contact 5 is driven by an operating mechanism provided in the housing, so that the moving contact 5 is electrically connected to the other wiring component. The contact 5 contacts or separates from the static contact, thereby connecting or disconnecting the one-phase main line of the circuit breaker; two adjacent conductive systems are connected in a linked manner to achieve synchronous connection or disconnection of the multi-phase main line of the circuit breaker. disconnect.

Further, each conductive system also includes a protection mechanism that cooperates with the operating mechanism. The protection mechanism includes a short-circuit protection mechanism and/or an overload protection mechanism. When a short-circuit fault occurs, the short-circuit protection mechanism triggers the operating mechanism to trip. When an overload fault occurs, , the overload protection mechanism triggers the operating mechanism to trip. The short-circuit protection mechanism can be an electromagnetic release. When the current flowing through the electromagnetic release is too large, the electromagnetic release triggers the operating mechanism to trip, or it can cooperate with each other. The transformer module, control module and tripper, the transformer module feeds back the detected current signal to the control module, and the control module drives the tripper to trigger the operating mechanism to trip. The control module of the circuit breaker at least includes a circuit board and The controller is connected to the circuit board, and the controller outputs a control signal based on the feedback signal to control the tripper.

The improvement point of this application is that the transformer module includes a first transformer 1 and a second transformer 2. The first transformer 1 is connected to the main line of the circuit breaker and is used to collect the current signal of the main line. The main line passes through The central hole of the first transformer 1 diverts the main line of the circuit breaker into a branch line. The second transformer 2 is connected to the branch line and is used to collect the current signal of the branch line. The branch line passes through the second transformer 2 Center hole, the current flowing through the branch line is less than the current flowing through the main line of the circuit breaker. In this way, the first transformer 1 and the second transformer 2 are respectively connected to the main line and the branch line. The branch line diverts a smaller current from the main line to avoid the problem caused by a large current flowing through both transformers. The overall temperature rise is too high, which is beneficial to improving the performance of the transformer module.

Specifically, the transformer module also includes a first conductive member 3 and a second conductive member 4, wherein the first conductive member 3 is connected in series to a phase main line of the circuit breaker, and the first conductive member 3 passes through the first conductive member 1 The second conductive member 4 passes through the center hole of the second transformer 2 to form a branch line. The second transformer 2 is connected in parallel with the first transformer 1 through the branch line, and the second transformer 2 is located in the first transformer 1 One side of the branch line, that is, both ends of the branch line are electrically connected to both ends of the first conductive member 3 respectively, which has the advantages of simple structure and convenient wiring; preferably, the cross-sectional area of the first conductive member 3 is larger than that of the second conductive member 4 The cross-sectional area makes the resistance of the first conductive member 3 smaller than the resistance of the second conductive member 4, which is conducive to realizing that the current flowing through the branch line is smaller than the current of the main line.

A specific embodiment of a transformer module is provided with reference to Figures 1-4.

As shown in Figures 1 and 2, the transformer module includes a first transformer 1, a second transformer 2, a first conductive component 3 and a second conductive component 4, where the first conductive component 3 is a connecting plate, and the first conductive component 3 is used to be connected in series to the one-phase main line of the circuit breaker. The second conductive member 4 is a soft connection. In Figures 1-3, the first conductive member 3 passes through the center hole of the first transformer 1. In Figure 1, 2 and 4, the two ends of the second conductive member 4 are connected to the two ends of the first conductive member 3 respectively, and the middle part of the second conductive member 4 passes through the center hole of the second transformer 2 and spans the first transformer 1 , preferably, both ends of the second conductive member 4 are welded to the first conductive member 3 respectively, which improves the wiring stability of the first conductive member 3 and the second conductive member 4, facilitates the formation of a whole, and facilitates assembly in the circuit breaker. , In addition, the second transformer 2 and the second conductive member 4 are located on the same side of the first conductive member 3, which is beneficial to shortening the length of the second conductive member 4 and saving space.

In addition, the first conductive member 3 is not limited to the connecting plate. The first conductive member 3 can also be a wire. The second conductive member 4 is not limited to a soft connection. The second conductive member 4 can also be a plate-shaped conductor. It only needs to ensure that the first conductive member 3 is a conductor. The cross-sectional area of the second conductive member 4 is smaller than the cross-sectional area of the first conductive member 3, so that the current flowing through the branch line is less than the current flowing through the one-phase main line of the circuit breaker. That is, the current flowing through the second conductive member 4 is less than The current flows through the first conductive member 3. In this embodiment, the first transformer 1 and the second transformer 2 are respectively connected to the control module of the circuit breaker. The first transformer 1 is used to achieve protection, such as overload or Short circuit protection, the second transformer 2 is used to realize the metering function.

As shown in Figures 1 and 2, the circuit breaker includes three conductive systems arranged in parallel. Each conductive system includes a pair of wiring components, a contact mechanism and a transformer module. The contact mechanism and transformer module are arranged on a pair of wiring components. Specifically, the contact mechanism includes a movable contact 5 and a static contact that cooperate with each other. The movable contact 5 is electrically connected to the wiring assembly adjacent to the movable contact 5, and the static contact is electrically connected to the wiring assembly adjacent to the static contact. Connection. In this embodiment, the transformer module is located between the movable contact 5 and the wiring component adjacent to the movable contact 5. Preferably, the movable contact 5, the first conductive member 3 and the wiring component adjacent to the movable contact 5 Connected in sequence, the first transformer 1 is located between the second transformer 2 and the movable contact 5. In this embodiment, the first conductive member 3 is a connecting plate, and the connecting plate can be provided with a connecting hole for connecting to the wiring assembly. , which facilitates the assembly of wiring components. The second conductive member 4 is a soft connection and takes up less space in the housing. Of course, the transformer module can also be disposed between the static contact and another wiring component. In this case, the first transformer is located between the second transformer 2 and the static contact. The static contact, the first conductive member 3 and The wiring components adjacent to the static contacts are connected in sequence.

The circuit breaker also includes a third transformer, a control module and a release. At least one phase of the main line of the circuit breaker is connected to the third transformer. When the circuit breaker is a multi-pole circuit breaker, the multi-phase main lines can be connected simultaneously. Pass through the center hole of a third transformer, that is, at least one phase main line connected between a pair of wiring components in the conductive system passes through the center hole of the third transformer. The third transformer is a zero sequence transformer for detection. Leakage signal; the control module at least includes a circuit board and a controller connected to the circuit board. The control module is connected to the third transformer for detecting whether there is a leakage signal on the main line of the conductive system. The control module is connected to the second transformer 2. For metering, the control module is connected to the first transformer 1 and the release. The control module triggers the release based on the signal collected by the first transformer 1 for overload or short-circuit protection.

It should be noted that in the description of the present utility model, the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on those shown in the accompanying drawings. The orientation or positional relationship, or the orientation or positional relationship commonly placed during use, is only for convenience of description, and does not indicate that the device or component referred to must have a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish descriptions and cannot be understood as indicating relative importance.

The above content is a further detailed description of the present utility model in combination with specific preferred embodiments. It cannot be concluded that the specific implementation of the present utility model is limited to these descriptions. For those of ordinary skill in the technical field to which the present utility model belongs, some simple deductions or substitutions can be made without departing from the concept of the present utility model, which should be regarded as belonging to the protection scope of the present utility model.

Claims (10)

1. The transformer module comprises a first transformer (1), wherein the first transformer (1) is connected to a main circuit of a circuit breaker, and is characterized in that: the circuit breaker further comprises a second mutual inductor (2), wherein the main circuit of the circuit breaker branches off a branch circuit, the second mutual inductor (2) is connected to the branch circuit, and the current flowing through the branch circuit is smaller than the current flowing through the main circuit of the circuit breaker.

2. The transformer module of claim 1, wherein: the second transformer (2) is connected with the first transformer (1) in parallel through a branch line, and the second transformer (2) is positioned on one side of the first transformer (1).

3. The transformer module of claim 1 or 2, wherein: the circuit breaker also comprises a first conductive piece (3), wherein the first conductive piece (3) is connected into the main circuit of the circuit breaker in series, and the first conductive piece (3) passes through the central hole of the first transformer (1).

4. A transformer module according to claim 3, wherein: the transformer also comprises a second conductive piece (4), wherein the second conductive piece (4) penetrates through two ends of the central hole of the second transformer (2) to be respectively and electrically connected with two ends of the first conductive piece (3).

5. The transformer module of claim 4, wherein: the cross-sectional area of the second conductive member (4) is smaller than the cross-sectional area of the first conductive member (3).

6. The transformer module of claim 4, wherein: the second conductive piece (4) and the second transformer (2) are positioned on the same side of the first conductive piece (3), and the middle part of the second conductive piece (4) passes through the central hole of the second transformer (2) and spans the first transformer (1).

7. The transformer module of claim 6, wherein: the first conductive piece (3) is a connecting plate, and the second conductive piece (4) is in soft connection.

8. The circuit breaker comprises a shell and at least one conductive system arranged in the shell, wherein the conductive system comprises a pair of wire connecting assemblies, and a phase main circuit of the circuit breaker is connected between the pair of wire connecting assemblies, and the circuit breaker is characterized in that: further comprising the transformer module of any one of claims 1-7 disposed between a pair of wire assemblies.

9. The circuit breaker of claim 8, wherein: the system also comprises a third transformer, and at least one phase of main circuit is connected with the third transformer for detecting leakage signals.

10. The circuit breaker of claim 8, wherein: the control module at least comprises a circuit board and a controller connected to the circuit board, the control module is connected with the second transformer (2) for metering, the control module is connected with the first transformer (1) and the release, and the control module triggers the release to carry out overload or short-circuit protection based on signals collected by the first transformer (1).