CN216528662U

CN216528662U - Mutual inductance device and frame-type circuit breaker

Info

Publication number: CN216528662U
Application number: CN202122828104.XU
Authority: CN
Inventors: 詹泽鑫; 代智; 杨嘉豪; 谢建波; 于波
Original assignee: Shanghai Liangxin Electrical Co Ltd
Current assignee: Shanghai Liangxin Electrical Co Ltd
Priority date: 2021-11-17
Filing date: 2021-11-17
Publication date: 2022-05-13
Anticipated expiration: 2031-11-17

Abstract

The utility model discloses a mutual inductance device and a frame type circuit breaker, and relates to the technical field of electrical equipment. The mutual inductor and the frame type circuit breaker provided by the utility model can realize high-precision measurement of electric signals in a wide range, so that the mutual inductor can meet the requirement of power internet of things.

Description

Mutual inductance device and frame-type circuit breaker

Technical Field

The utility model relates to the field of electrical equipment, in particular to a mutual inductance device and a frame type circuit breaker.

Background

The frame type circuit breaker is also called universal circuit breaker, and is a mechanical switch electric appliance which can connect, bear and break the current under the normal circuit condition, and can also connect, bear and break the current for a certain time under the specified abnormal circuit condition. The existing frame-type circuit breaker has a protection function, a mutual inductor is arranged inside the frame-type circuit breaker to sample electric signals in the frame-type circuit breaker, and when the current or the voltage obtained by sampling is higher than a preset threshold value, the frame-type circuit breaker is switched off to complete the protection function of a rear-end load.

The mutual inductor of the existing frame circuit breaker product is generally divided into two parts: one part is used as current protection sampling, and the other part provides current energy to supply power for the controller; the mutual inductor of the protection part generally adopts a hollow mutual inductor (also called a Rogowski coil), and the sampling range is wider; the mutual inductor of the power supply part mainly supplies power to the controller to enable the controller to work. According to the development trend of the power internet of things, although the sampling range of the existing hollow mutual inductor of the protection part is wide, the sampling precision is generally about 1.5%, the high-precision requirement of the market requirement cannot be met by 0.5%, the high-precision requirement in a wide range cannot be met, and the development trend of the power internet of things cannot be met.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a mutual inductor and a frame type circuit breaker, which can realize high-precision measurement of electric signals in a wide range, so that a mutual inductor can meet the requirement of power internet of things.

The embodiment of the utility model is realized by the following steps:

a mutual inductor comprises a metering mutual inductor, a protection mutual inductor and a power supply mutual inductor, wherein the metering mutual inductor, the protection mutual inductor and the power supply mutual inductor are fixedly arranged in a stacking mode, and an overlapping area is formed in the projection of the metering mutual inductor, the protection mutual inductor and the power supply mutual inductor in the stacking direction perpendicular to the stacking direction.

As an implementable mode, the mutual inductor further comprises a first connecting terminal, and the first connecting terminal is respectively connected with the output end of the metering transformer, the output end of the protection transformer and the output end of the power supply transformer.

As an implementable mode, the first wiring terminal is connected with the output end of the metering transformer, the output end of the protection transformer and the output end of the power supply transformer through the circuit board.

As an implementable mode, the power supply mutual inductor, the protection mutual inductor and the metering mutual inductor are sequentially arranged in a stacked mode.

As an implementable mode, the circuit board and the first wiring terminal are arranged on one side, away from the protection transformer, of the power supply transformer.

As an implementable mode, the mutual inductor further comprises a shell, the shell comprises a front cover arranged on one side of the power supply mutual inductor and a rear cover arranged on one side of the metering mutual inductor, and the front cover and the rear cover are clamped to enclose the metering mutual inductor, the protection mutual inductor and the power supply mutual inductor between the front cover and the rear cover.

As an implementable mode, a through hole is formed in the front cover corresponding to the first wiring terminal, and the first wiring terminal is exposed through the through hole.

As an implementable manner, the power supply transformer is an iron core transformer.

A frame type circuit breaker comprises a circuit breaker body, a controller and the mutual inductance device, wherein the mutual inductance device is connected with a wiring terminal of the circuit breaker body to test an electric signal of the circuit breaker, and the mutual inductance device is further connected with the controller to transmit a test result to the controller.

As an implementable manner, the frame-type circuit breaker further includes a connecting wire, a second connecting terminal is provided on the controller, and the connecting wire connects the first connecting terminal and the second connecting terminal so as to connect the controller with the mutual inductance device.

The embodiment of the utility model has the beneficial effects that:

the utility model provides a mutual inductor and a frame type circuit breaker, which comprise a metering transformer, a protection transformer and a power supply transformer, wherein the metering transformer is used for measuring an electric signal passing through the central current of the metering transformer in a high-precision manner, the protection transformer is used for measuring the electric signal passing through the central current of the protection transformer in a wide range, the power supply transformer is used for acquiring partial current to supply power for control equipment, so that the mutual inductor can realize the high-precision measurement in the wide range, the metering transformer, the protection transformer and the power supply transformer are stacked, and the projections perpendicular to the stacking direction have overlapping regions, so that the space occupied by the mutual inductor can be reduced, and the mutual inductor can realize the high-precision measurement of the electric signal in the wide range, so that the mutual inductor can meet the requirement of power physical connection.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Figure 1 is a schematic diagram of a mutual inductance device according to an embodiment of the present invention;

figure 2 is an exploded view of a mutual inductance device according to an embodiment of the present invention;

fig. 3 is a connection diagram of a frame type circuit breaker according to an embodiment of the present invention.

Icon: 110-a mutual inductance device; 111-a metering transformer; 112-a protection transformer; 113-supply transformer; 114-a first connection terminal; 115-a circuit board; 116-a front cover; 117-rear cover; 118-a through-hole; 100-frame circuit breaker; 120-a circuit breaker body; 130-a controller.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The mutual inductor can be to passing its central electric current or magnitude of voltage and reducing in proportion, when the mutual inductor is applied to the circuit breaker, the voltage or the current after reducing are detected and are reachd current value or magnitude of voltage and control the branch of circuit breaker, the combined floodgate state according to current value or magnitude of voltage, in order to reach protection circuit's effect, but present frame-type circuit breaker only is provided with a protection mutual inductor, can only play protection circuit's effect, increase high accuracy measurement and thing allies oneself with the function along with the increase that national electric power thing networking new standard provided, present frame-type circuit breaker can not satisfy the demand of electric power thing networking.

The utility model provides a mutual inductance device 110, which comprises a metering transformer 111, a protection transformer 112 and a power supply transformer 113, wherein the metering transformer 111, the protection transformer 112 and the power supply transformer 113 are fixedly arranged in a stacking mode, and projections of the metering transformer 111, the protection transformer 112 and the power supply transformer 113 in the direction perpendicular to the stacking direction are provided with overlapping areas.

It should be noted that, in the present invention, the stacking order of the metering transformer 111, the protection transformer 112, and the power supply transformer 113 is not specifically limited, and may be randomly arranged according to the actual situation. The stacking manner is not particularly limited, as long as the projection of the measurement transformer 111, the protection transformer 112 and the power supply transformer 113 in the direction perpendicular to the stacking direction has an overlapping area, and for example, the measurement transformer 111, the protection transformer 112 and the power supply transformer 113 may be concentrically stacked to reduce the space occupied by the mutual inductance device 110.

Wherein, the sampling range of the protection transformer 112 is 0-10In, and the sampling precision is usually 1.5%; the sampling range of the metering transformer 111 is 0.004-1.2 In, the precision can reach 0.5 level, the high-precision requirement of current is met, and the requirement of metering electric quantity is met; the sampling range of the protection transformer 112 is wide, the protection function of the frame-type circuit breaker 100 can be well realized, but the precision is low, the requirement of high precision of current is not met, and the protection transformer cannot be used for measuring electric quantity. The present invention applies the protection transformer 112 and the metering transformer 111 to the measurement of the electrical signal of the frame type circuit breaker 100, and can measure the electrical signal passing through the center current thereof in a wide range and with high accuracy.

And a power transformer 113 for obtaining a part of current to supply power to the control unit in the frame type circuit breaker 100 so as to normally operate.

The mutual inductance device 110 provided by the utility model comprises a metering transformer 111, a protection transformer 112 and a power supply transformer 113, wherein the metering transformer 111 measures the electric signal of the current passing through the center of the metering transformer with high precision, the protection transformer 112 measures the electric signal of the current passing through the center of the metering transformer with wide range, the power supply transformer 113 is used for acquiring partial current to supply power for the control equipment, therefore, the mutual inductance device 110 can realize high-precision measurement in a wide range, and the metering transformer 111, the protection transformer 112 and the power supply transformer 113 are stacked, so that the space occupied by the mutual inductance device 110 can be reduced, and the projections of the metering transformer 111, the protection transformer 112 and the power supply transformer 113 in the direction perpendicular to the stacking direction have overlapping areas, therefore, the mutual inductor 110 of the present invention can realize high-precision measurement of electrical signals in a wide range, so that the mutual inductor 110 can meet the requirement of power physical connection.

Optionally, as shown in fig. 1 and fig. 2, the mutual inductance device 110 further includes a first connection terminal 114, and the first connection terminal 114 is respectively connected to the output terminal of the metering transformer 111, the output terminal of the protection transformer 112, and the output terminal of the power supply transformer 113.

The electric signal detected by the metering transformer 111 needs to be transmitted to a metering unit in the frame-type circuit breaker 100, the electric signal detected by the protection transformer 112 needs to be transmitted to a control unit in the frame-type circuit breaker 100, and the current obtained by the power supply transformer 113 needs to supply power to the control unit, that is, the metering transformer 111, the protection transformer 112 and the power supply transformer 113 all need to be transmitted to the frame-type circuit breaker 100, and the connection lines of a plurality of output ends are different in length, so that the connection lines can be disordered. This use novel embodiment to set up first binding post 114, first binding post 114 respectively with measurement mutual-inductor 111's output, protection mutual-inductor 112's output and power supply mutual-inductor 113's output are connected, and measurement mutual-inductor 111, when protection mutual-inductor 112 and power supply mutual-inductor 113 stack up the setting with one heart, first binding post 114 sets up on mutual inductance device 110, make mutual inductance device 110's output as a whole, first binding post 114 can simplify mutual inductance device 110 and frame type circuit breaker 100 be connected, only need be connected first binding post 114 and frame type circuit breaker 100 can.

In an implementation manner of the embodiment of the present invention, as shown in fig. 1 and fig. 2, the first connection terminal 114 is connected to the output terminal of the metering transformer 111, the output terminal of the protection transformer 112, and the output terminal of the power supply transformer 113 through the circuit board 115.

Optionally, as shown in fig. 1 and fig. 2, the power supply transformer 113, the protection transformer 112, and the metering transformer 111 are sequentially stacked.

The power supply transformer 113 needs to acquire partial current to supply power to the control unit, and the conductor needs to acquire partial current through the electromagnetic induction principle, so that a magnetic field is usually generated at the periphery of the power supply transformer 113, and for the metering transformer 111 with high-precision measurement, the magnetic field generated by the power supply transformer 113 has certain influence on the precision of the measurement result of the metering transformer 111. The measurement accuracy required by the protection function of the protection transformer 112 is not high, so that the influence of the magnetic field generated by the power supply transformer 113 on the measurement accuracy of the protection transformer 112 is negligible.

In an implementation manner of the embodiment of the present invention, as shown in fig. 1 and fig. 2, the circuit board 115 and the first connection terminal 114 are disposed on a side of the power transformer 113 away from the protection transformer 112.

When the power supply transformer 113, the protection transformer 112 and the metering transformer 111 are sequentially stacked, the circuit board 115 and the first connection terminal 114 are arranged on one side of the power supply transformer 113 far away from the protection transformer 112, the power supply transformer 113 generally comprises a circular ring part and a magnet part arranged on the outer side of the circular ring part, and the magnet part is generally in a block shape, so that the volume of the power supply transformer 113 is slightly larger, the circular ring part without the magnet part is slightly thinner, the circuit board 115 and the first connection terminal 114 are arranged at the position, the space of the mutual inductance device 110 can be effectively utilized, and the volume of the mutual inductance device 110 is reduced.

Optionally, as shown in fig. 1 and fig. 2, the mutual inductance device 110 further includes a housing, the housing includes a front cover 116 disposed on one side of the power transformer 113 and a rear cover 117 disposed on one side of the metering transformer 111, and the front cover 116 is engaged with the rear cover 117 to enclose the metering transformer 111, the protection transformer 112 and the power transformer 113 between the front cover 116 and the rear cover 117.

The mutual inductor 110 generates collision and friction during transportation and installation, and each component in the mutual inductor 110 is sensitive to collision and friction, so the embodiment of the present invention comprises a front cover 116 on one side of the power transformer 113, a rear cover 117 on one side of the metering transformer 111, the front cover 116 and the rear cover 117 are engaged to enclose the metering transformer 111, the protection transformer 112 and the power transformer 113 between the front cover 116 and the rear cover 117, and the front cover 116 and the rear cover 117 protect the metering transformer 111, the protection transformer 112 and the power transformer 113, wherein the specific form and material of the front cover 116 and the rear cover 117 are not limited as long as the metering transformer 111, the protection transformer 112 and the power transformer 113 can be protected and are not conductive, because there is current passing through the metering transformer 111, the protection transformer 112 and the power transformer 113, if the front cover 116 and the rear cover 117 are conductive, may affect the current flowing through the mutual inductance device 110.

It should be noted that, because the metering transformer 111, the protection transformer 112, and the power supply transformer 113 are all hollow circular rings, when the front cover 116 and the rear cover 117 are disposed, the centers of the circular rings of the front cover 116 and the rear cover 117 may be disposed as square holes, and the side walls of the square holes are formed by the side walls of the front cover 116 and the rear cover 117.

It should be noted that, because the metering transformer 111, the protection transformer 112, and the power supply transformer 113 all generate heat during operation, in order to enable the generated heat to be timely transmitted to the outside, heat dissipation holes may be formed in one or both of the front cover 116 and the rear cover 117.

In an implementation manner of the embodiment of the present invention, as shown in fig. 1 and fig. 2, a through hole 118 is disposed on the front cover 116 corresponding to the first connection terminal 114, and the first connection terminal 114 is exposed through the through hole 118.

The first connection terminal 114 is used to connect the mutual inductance device 110 with the frame type breaker 100, and the first connection terminal 114 is disposed at one side of the power supply transformer 113, so that a through hole 118 is provided on the front cover 116, so that the first connection terminal 114 is exposed through the through hole 118, and the connection of the mutual inductance device 110 with the frame type breaker 100 can be facilitated.

Optionally, the power supply transformer 113 is an iron core transformer. As will be appreciated by those skilled in the art, iron is used as a material with stronger magnetism, and when the power transformer 113 obtains a partial current, the iron transformer can provide a stronger magnetic field, so as to conveniently obtain the partial current.

The present invention also provides a frame type circuit breaker 100, as shown in fig. 3, including a breaker body 120, the above-mentioned mutual inductance device 110 and a controller 130, wherein the mutual inductance device 110 is connected with a connection terminal of the breaker body 120 to test an electrical signal of the breaker, and the mutual inductance device 110 is further connected with the controller 130 to transmit a test result to the controller 130.

The sampling range of the metering transformer 111 is 0.004-1.2 In, and the precision can reach 0.5 level, so that the metering transformer 111 can accurately measure a current value and transmit the current value to the controller 130, and the controller 130 calculates the electric quantity of the current according to the tested current value and voltage value, thereby achieving the metering function of the frame type circuit breaker 100. The sampling range of the protection transformer 112 is 0-10In, wide-range current measurement can be performed, the protection transformer 112 is connected with the controller 130, the controller 130 is connected with the circuit breaker body 120 to control the opening of the circuit breaker body 120, the protection transformer 112 measures the current value of the current passing through the protection transformer 112 and transmits the current value to the controller 130, the controller 130 judges whether the current value is In the current range, and if the current value exceeds the current value threshold, the control unit controls the opening of the circuit breaker body 120, so that the effect of protecting the circuit is achieved. The frame type circuit breaker 100 can protect a circuit and simultaneously realize the metering function of the circuit breaker so as to meet the requirement of the corresponding power internet of things, and when the frame type circuit breaker 100 is used, no metering device is required to be additionally arranged, so that the space and the cost can be saved.

In an implementation manner of the embodiment of the present invention, the frame type circuit breaker 100 further includes a connection line, and the controller 130 is provided with a second connection terminal, and the connection line connects the first connection terminal 114 and the second connection terminal, so that the controller 130 is connected to the mutual inductance device 110.

The both ends of connecting wire are connected with first binding post 114 and second binding post respectively for mutual inductance device 110 is connected with controller 130, and the one end setting of connecting wire is connected with the wiring end that first binding post 114 corresponds, makes first binding post 114 can be fast and conveniently to be connected with the one end of connecting wire, and in the same way, the other end of connecting wire sets up in the wiring end that second binding post corresponds, makes second binding post can be fast and conveniently to be connected with the connecting wire.

It should be noted that the utility model of the specific form of the connection terminal is not limited, as long as the connection terminal can transmit signals and is convenient to plug and unplug.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A mutual inductance device (110) is characterized by comprising a metering transformer (111), a protection transformer (112) and a power supply transformer (113), wherein the metering transformer (111), the protection transformer (112) and the power supply transformer (113) are fixedly arranged in a stacking mode, and projections of the metering transformer, the protection transformer and the power supply transformer (113) in the direction perpendicular to the stacking direction have an overlapping area.

2. The mutual inductance device (110) of claim 1, further comprising a first connection terminal (114), the first connection terminal (114) being connected to an output terminal of the metering transformer (111), an output terminal of the protection transformer (112) and an output terminal of the power supply transformer (113), respectively.

3. A mutual inductance device (110) according to claim 2, characterized in that said first connection terminal (114) is connected to the output of said metering transformer (111), the output of the protection transformer (112) and the output of the power supply transformer (113) through a circuit board (115).

4. A mutual inductance device (110) according to claim 3, characterized in that said supply transformer (113), said protection transformer (112) and said metering transformer (111) are arranged one above the other.

5. Mutual inductance device (110) according to claim 4, characterized in that the circuit board (115) and the first connection terminal (114) are arranged on the side of the supply transformer (113) remote from the protection transformer (112).

6. The mutual inductance device (110) according to claim 4, further comprising a housing including a front cover (116) disposed at a side of the power transformer (113) and a rear cover (117) disposed at a side of the metering transformer (111), the front cover (116) being engaged with the rear cover (117) to enclose the metering transformer (111), the protection transformer (112) and the power transformer (113) between the front cover (116) and the rear cover (117).

7. A mutual inductance device (110) according to claim 6, wherein a through hole (118) is provided on said front cover (116) corresponding to said first connection terminal (114), said first connection terminal (114) being exposed through said through hole (118).

8. The mutual inductance device (110) according to claim 1, wherein said power supply transformer (113) is an iron core transformer.

9. A frame type circuit breaker (100) comprising a circuit breaker body (120), a controller (130) and a mutual inductance device (110) according to any of claims 1-8, the mutual inductance device (110) being connected to a circuit breaker body (120) terminal for testing an electrical signal of the circuit breaker, the mutual inductance device (110) being further connected to the controller (130) for transmitting a test result to the controller (130).

10. The frame circuit breaker (100) of claim 9, further comprising a connection line, a second terminal being disposed on the controller (130), the connection line connecting the first terminal (114) and the second terminal to connect the controller (130) with the mutual inductance device (110).