CN113161133A

CN113161133A - Combined current transformer

Info

Publication number: CN113161133A
Application number: CN202010076234.XA
Authority: CN
Inventors: 张炎; 吕毅华; 董郁; 朱金保; 南寅
Original assignee: Beijing Jingren Electric Appliance Co ltd; Shourui Tianjin Electric Equipment Co ltd; Sooar Beijing Investmnt Management Group Co ltd; Tianjin Jingren Electric Appliance Co ltd; Beijing Peoples Electric Plant Co Ltd
Current assignee: Beijing Jingren Electric Appliance Co ltd; Shourui Tianjin Electric Equipment Co ltd; Sooar Beijing Investmnt Management Group Co ltd; Tianjin Jingren Electric Appliance Co ltd; Beijing Peoples Electric Plant Co Ltd
Priority date: 2020-01-23
Filing date: 2020-01-23
Publication date: 2021-07-23

Abstract

The invention discloses a combined current transformer installed in a molded case circuit breaker, which at least comprises a first current transformer, an iron core current transformer and/or a second current transformer, wherein two ends of the iron core current transformer are respectively provided with a coil, and the first current transformer is arranged between the two coils. The main function of the first current transformer is to provide a high-precision current measurement signal for a controller of the circuit breaker. The iron core current transformer has the main function of providing a power supply and a current protection signal for a release of the circuit breaker or only providing a power supply for the release of the circuit breaker. Therefore, the combined current transformer can realize accurate measurement of current in a power utilization loop and current protection measurement and provide power for a release of the circuit breaker. The purpose of minimizing the occupied space in the circuit breaker is achieved by reasonably designing and combining the shape and the size of the current transformer and the position of each transformer.

Description

Combined current transformer

Technical Field

The invention relates to the field of low-voltage electric appliances, in particular to a combined current transformer arranged in a molded case circuit breaker.

Background

Along with the rise of the internet of things of the electric power system, the requirement of the circuit breaker with the online electric energy measurement function is provided, so that a transformer with the accurate current measurement function needs to be added on the basis of an iron core current transformer of the traditional circuit breaker, and the loop current is accurately measured. In order to ensure that the circuit breaker after upgrading does not influence the use in the box body matched with the traditional circuit breaker, the size of the circuit breaker needs to be strictly controlled so as to be arranged in the original box body, so that how to reasonably design and skillfully arrange the additionally arranged current transformer and how to use the current transformer matched with the iron core current transformer in the original traditional circuit breaker are very important.

Disclosure of Invention

Based on the background, the invention provides a combined current transformer which can effectively solve the problems, and the combined current transformer is arranged in a circuit breaker to occupy the minimum volume by reasonably designing the shapes and the sizes of the current transformer and an iron core current transformer and skillfully arranging the positions of the current transformer and the iron core current transformer, so that the function of measuring electric energy is added on the basis of the functions of the traditional circuit breaker.

The above object of the present invention can be achieved by the following technical solutions:

the utility model provides a modular current transformer, includes first current transformer at least, still includes iron core current transformer and/or second current transformer, iron core current transformer's both ends are equipped with the coil respectively, first current transformer locates between two coils. The first current transformer mainly functions to provide high-precision current measurement signals for a controller of the circuit breaker, and the iron core current transformer mainly functions to provide power and current protection signals for a release of the circuit breaker or only provide power for the release of the circuit breaker.

Preferably, the first current transformer and/or the second current transformer may be in contact with or non-contact with a core of the core current transformer.

Preferably, the first current transformer and the second current transformer are respectively arranged on two sides of an iron core of the iron core current transformer.

Preferably, the first current transformer and/or the second current transformer includes, but is not limited to, a current transformer, a Rogowski coil, or a hall current sensor.

Preferably, the first current transformer and/or the second current transformer are/is circular, rectangular or square in shape.

Preferably, the first current transformer shares the same bus with at least one of the iron core current transformer and the second current transformer.

Preferably, the first current transformer and the second current transformer are arranged in sequence.

The invention has the following beneficial effects:

1. according to the invention, the first current transformer is arranged at the inner sides of the two coils of the iron core current transformer with the coils at the two ends by optimizing the shapes and the sizes of the first current transformer and the iron core current transformer, so that the occupied space is minimum, and the volume requirement of the circuit breaker is met;

2. according to the invention, by optimizing the relative positions of the first current transformer and the iron core current transformer, the magnetic field of the combined current transformer is stable, the interference from the outside is small, and the improvement of the measurement precision is facilitated;

3. according to the invention, the current transformers are arranged on the two sides of the iron core current transformer, so that the first current transformer, the iron core current transformer and the second current transformer share the same bus, and the purposes of scientific and reasonable arrangement, simple and convenient connection and reliability in the circuit breaker can be realized.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural view of a combined current transformer according to a first embodiment of the present invention.

Fig. 2 is another angle structure diagram of the combined current transformer of the first embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a combined current transformer according to a second embodiment of the present invention.

Fig. 4 is a schematic structural diagram of a combined current transformer according to a third embodiment of the present invention.

Fig. 5 is a schematic structural view of a combined current transformer according to a fourth embodiment of the present invention.

Fig. 6 is a schematic structural view of a combined current transformer according to a fifth embodiment of the present invention.

Fig. 7 is a schematic external view of a first current transformer and a second current transformer of the combined current transformer of the present invention.

Detailed Description

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 only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.

As shown in fig. 1, the present invention provides a combined current transformer 01 installed in a molded case circuit breaker according to a first embodiment, where the combined current transformer 01 at least includes two current transformers, in this embodiment, the combined current transformer 01 includes a first current transformer 10 and an iron core current transformer 20, in this embodiment, the number of the first current transformer 10 and the number of the iron core current transformer 20 are respectively one, the first current transformer 10 and the iron core current transformer 20 are respectively in a hollow annular structure, the iron core current transformer 20 includes an iron core 201 and two coils 202, the two coils 202 are respectively and oppositely disposed at two ends of the iron core 201, and the iron core current transformer 20 mainly functions to provide a power supply and a current protection signal for a release of the circuit breaker or only provide a power supply for a release of the circuit breaker. First current transformer 10 is located between two coils 202, promptly first current transformer 10 sets up the inboard of two coils 202 that have the iron core current transformer 20 of coil at both ends, just first current transformer 10 axial with the axial perpendicular setting of iron core current transformer 20's coil 202, first current transformer 10's main function provides the current measurement signal of high accuracy for the controller of circuit breaker, and the main loop generating line of circuit breaker can pass in proper order first current transformer 10 with the hollow portion of iron core current transformer 20, promptly: the first current transformer 10 and the iron core current transformer 20 share the same bus. In this embodiment, the first current transformer 10 of the combined current transformer 01 is disposed between two coils 202 of the iron core current transformer 20, and is in contact with an iron core surface of the iron core 201, and an axial direction of the first current transformer 10 is perpendicular to an axial direction of the coils 202. The first current transformer 10 is in the form of, but not limited to, a current transformer, a Rogowski coil, or a hall current sensor.

It should be noted that, the number of transformers, the corresponding position relationship, the shape of the transformer and the functions of each transformer included in the combined transformer 01 are designed differently according to different applications in practical application, which is not limited herein, and the following specific details are described as follows: referring to fig. 3, a combined current transformer 01 of a second embodiment is disclosed, where the combined current transformer 01 includes a first current transformer 10 and an iron core current transformer 20, and like the first embodiment, the iron core current transformer 20 of the present embodiment includes an iron core 201 and two coils 202, the two coils 202 are respectively and oppositely disposed at two ends of the iron core 201, the first current transformer 10 is disposed between the two coils 202, and different from the first embodiment, the first current transformer 10 of the present embodiment is not in contact with the iron core 201 between the two coils 202 of the iron core current transformer 20, and a certain distance is disposed between the two coils, so as to increase an electrical gap between the two transformers.

Referring to fig. 4, a combined current transformer 01 of a third embodiment is disclosed, in this embodiment, a second current transformer 30 is added on the basis of the first embodiment, the second current transformer 30 and the first current transformer 10 are oppositely disposed on two sides of an iron core 201 of the iron core current transformer 20 and respectively located between the two coils 202 of the iron core current transformer 20, and the second current transformer 30 and the first current transformer 10 are respectively in contact with an iron core surface of the iron core 201 of the iron core current transformer 20. The main loop conductor of the circuit breaker may sequentially pass through the first current transformer 10, the iron core current transformer 20, and the second current transformer 30.

Referring to fig. 5, a combined current transformer 01 of a fourth embodiment is disclosed, which is the same as the third embodiment, the combined current transformer 01 of the present embodiment includes a first current transformer 10 and a second current transformer 30, the second current transformer 30 and the first current transformer 10 are disposed at two sides of an iron core 201 of the iron core current transformer 20, and are respectively disposed between the two coils 202 of the iron core current transformer 20, unlike the third embodiment, in the present embodiment, the second current transformer 30 and the first current transformer 10 are respectively not in contact with an iron core surface of the iron core 201 of the iron core current transformer 20.

Referring to fig. 6, a combined current transformer 01 of a fifth embodiment is disclosed, in this embodiment, the combined current transformer 01 only includes a first current transformer 10 and a second current transformer 30, the first current transformer 10 and the second current transformer 30 are sequentially disposed, and a main loop wire of a circuit breaker may sequentially pass through the first current transformer 10 and the second current transformer 30.

Referring to fig. 7, the first current transformer 10 may have a circular, rectangular or square shape, and similarly, the second current transformer 30 may have a circular, rectangular or square shape.

In the embodiment of the above scheme, the first current transformer 10 may use a material with high magnetic permeability as a magnetic core, is sensitive to a small current and is not easily interfered by an external magnetic field, and is suitable for accurate measurement of a small current section, and for a circuit breaker, the measurement range is generally 0.05In to 1.2In, and the second current transformer 30 may use a material with low magnetic saturation as a framework, and performs coil winding, so that the current transformer is not easily saturated, has a large measurement range, is suitable for measurement of a large current section, and is used for protection of the circuit breaker, and for the circuit breaker, the measurement range is generally above 0.2 In.

The combined current transformer 01 of the present invention can be combined as follows according to different applications of the circuit breaker:

1. the combination of the first current transformer 10 and the iron core current transformer 20 having the power supply and protection functions, such as the structural combination shown in the first embodiment and the second embodiment, is applied to a circuit breaker with high electric energy measurement accuracy and low current protection accuracy;

2. the combination of the first current transformer 10, the iron core current transformer 20 having only the power supply function, and the second current protection transformer 30, as in the structural combinations of the third and fourth embodiments, is applied to a circuit breaker having high accuracy of electric energy measurement and high accuracy of current protection;

3. the combination of the first current transformer 10 and the second current transformer 30, the structural combination as in the fifth embodiment, is applied to a circuit breaker which is high in electric energy measurement accuracy, high in protection accuracy, and has an external power supply.

According to the invention, the shape and size of the first current transformer 10 and the iron core current transformer 20 are optimized, so that the first current transformer 10 is arranged at the inner sides of the two coils of the iron core current transformer 20 with the coils at the two ends, the occupied space is minimum, and the volume requirement of the circuit breaker is met; by optimizing the relative positions of the first current transformer 10 and the iron core current transformer 20, the magnetic field of the combined current transformer 01 is stable, is slightly interfered by the outside, and is beneficial to improving the measurement precision; the first current transformer 10 and/or the second current transformer 30 are/is arranged on the two sides of the iron core current transformer 20 respectively, so that the first current transformer 10, the iron core current transformer 20 and/or the second current transformer 30 share the same bus, and the purposes of scientific and reasonable arrangement, simple and convenient connection and reliability in the circuit breaker can be achieved.

The above is merely a preferred embodiment of the present invention, and those skilled in the art can make various changes or modifications to the embodiment of the present invention according to the disclosure of the application document without departing from the spirit and scope of the present invention.

Claims

1. The utility model provides a modular current transformer (01), includes first current transformer (10) at least, its characterized in that still includes iron core current transformer (20) and/or second current transformer (30), the both ends of iron core current transformer (20) are equipped with coil (202) respectively, first current transformer (10) are located between two coil (202).

2. A combined current transformer (01) according to claim 1, characterised in that: the first current transformer (10) and/or the second current transformer (30) may be in contact or non-contact with a core (201) of the core current transformer (20).

3. The combined current transformer (01) according to claim 1 or 2, wherein the first current transformer (10) and the second current transformer (30) are respectively arranged on two sides of an iron core (201) of the iron core current transformer (20).

4. A combined current transformer (01) according to claim 1, characterised in that: the first current transformer (10) and/or the second current transformer (30) include, but are not limited to, current transformers, Rogowski coils, or hall current sensors.

5. A combined current transformer (01) according to claim 1 or 4, characterized in that: the first current transformer (10) and/or the second current transformer (30) are/is round, rectangular or square in shape.

6. A combined current transformer (01) according to claim 1, characterised in that the first current transformer (10) shares the same bus bar with at least one of the core current transformer (20) and the second current transformer (30).

7. A combined current transformer (01) according to claim 1, characterised in that said first current transformer (10) and said second current transformer (30) are arranged one after the other.