Opening and closing runway type current transformer

Abstract

The utility model relates to the technical field of transformers, in particular to an opening and closing runway type current transformer which comprises two half-runway type shells which are symmetrically arranged, and the two half-runway type shells are defined to be the first half-runway type shell and the second half-runway type shell respectively. The first semi-runway type shell and the second semi-runway type shell are detachably connected to form a complete runway type shell, an iron core and a winding wound on the iron core are contained in a cavity of the first semi-runway type shell, and an iron core is contained in a cavity of the second semi-runway type shell; the first semi-runway type shell and the second semi-runway type shell are both filled with insulating materials. According to the utility model, a cable can be conveniently fixed to pass through the mutual inductor to complete installation.

Description

Technical Field

[0001] The utility model relates to the technical field of current transformers, and particularly relates to an opening and closing runway type current transformer. Background Technique

[0002] For a conventional through-core current transformer, the primary side is a single cable. When the outer diameter of the cable increases or the number of cables increases, the inner hole of the through-core current transformer needs to be increased accordingly. To meet the parameter requirements, the outer diameter of the current transformer will increase. Due to the volume limitation of the switch cabinet, the outer diameter of the current transformer is limited. Therefore, changing the inner hole of the current transformer to a runway type can meet the installation requirements of large cables or multiple cables. However, for some renovation projects, the cables are fixed and cannot be passed through the current transformer. When installing, the current transformer needs to pass through the cables. Content of the Utility Model

[0003] To solve the above problems, the utility model provides an opening and closing runway type current transformer, which can facilitate the passing of multiple large cables through the current transformer together without power-off to complete the installation.

[0004] To achieve the above purpose, the technical solution adopted by the utility model is: to provide an opening and closing runway type current transformer, which includes two symmetrically arranged semi-runway type shells. Define the two semi-runway type shells as the first semi-runway type shell and the second semi-runway type shell respectively. The first semi-runway type shell and the second semi-runway type shell are detachably connected into a complete runway type shell. The cavity of the first semi-runway type shell houses a iron core and windings wound around the iron core. The cavity of the second semi-runway type shell houses an iron core. Insulating materials are filled in both the first semi-runway type shell and the second semi-runway type shell.

[0005] Further, the first semi-runway type shell and the second semi-runway type shell are detachably connected up and down or left and right.

[0006] Further, the first semi-runway type shell and the second semi-runway type shell are detachably connected by fixing bolts, steel belts or hose clamps.

[0007] Further, when the first semi-runway type shell and the second semi-runway type shell are detachably connected by fixing bolts, corresponding bolt holes are respectively arranged on the outer sides of the connection parts of the first semi-runway type shell and the second semi-runway type shell. When the first semi-runway type shell and the second semi-runway type shell are combined into a complete runway type shell, the bolt holes on the first semi-runway type shell and the second semi-runway type shell are aligned for the same bolt to be screwed in.

[0008] Further, when the first semi-runway-shaped housing and the second semi-runway-shaped housing are detachably connected by a steel belt or a hose clamp, grooves are provided on the peripheries of the first semi-runway-shaped housing and the second semi-runway-shaped housing. When the first semi-runway-shaped housing and the second semi-runway-shaped housing are combined into a complete runway-shaped housing, the grooves on the first semi-runway-shaped housing and the second semi-runway-shaped housing form a circle. A steel belt or a hose clamp is embedded in the groove. One end of the steel belt or the hose clamp is provided with a self-tapping screw. After the steel belt or the hose clamp is embedded in the groove and goes around the complete runway-shaped housing for one circle, the two ends of the steel belt or the hose clamp overlap and are fixed by the self-tapping screw.

[0009] Further, the depth of the groove is 2-3 mm.

[0010] Further, limiting members located above the groove are provided on both the first semi-runway-shaped housing and the second semi-runway-shaped housing.

[0011] Further, the iron core is made of silicon steel sheets.

[0012] Further, the insulating material is epoxy resin.

[0013] The technical solution of the present utility model has the following advantages:

[0014] 1. The housing of the current transformer of the present utility model is designed in a runway form, and the housing is designed into two symmetrically arranged semi-runway-shaped housings. The two symmetrically arranged semi-runway-shaped housings are detachably connected, which is convenient for multiple cables to pass through the transformer at one time. During the installation process, there is no need to cut off the power supply.

[0015] For the renovation project with multiple cables in the primary side, the cables are already fixed and cannot be moved to pass through the transformer. The current transformer can be opened in the reverse direction, the opening and closing structure is first disconnected, the cables are passed through, and the transformer is closed through the fixing bolts or the steel belt or the hose clamp, that is, the installation is completed.

[0016] There is no need to cut off the power during installation, and it can be operated with electricity. After closing and connecting to the system, it can be directly put into use. The installation operation is simple, reducing the labor cost.

[0017] It should be understood that all combinations of the foregoing concepts and additional concepts described in greater detail below can be regarded as part of the inventive subject matter of the present disclosure as long as such concepts do not conflict with each other.

[0018] The foregoing and other aspects, embodiments, and features of the teachings of the present utility model can be more fully understood from the following description in conjunction with the accompanying drawings. Other additional aspects of the present utility model, such as the features and / or beneficial effects of the exemplary embodiments, will be apparent in the following description, or will be learned through the practice of the specific embodiments according to the teachings of the present utility model. Brief Description of the Drawings

[0019] The drawings do not represent the actual reference ratio. In the drawings, each identical or approximately identical component shown in each figure may be denoted by the same reference numeral. For the sake of clarity, not every component is labeled in each figure. Now, embodiments of various aspects of the present utility model will be described by way of example and with reference to the drawings, wherein:

[0020] Figure 1 FIG. 7 is a schematic diagram of the overall structure of the opening and closing runway type current transformer of the present utility model when adopting a fixed bolt structure.

[0021] Figure 2 FIG. 11 is a front view of the opening and closing runway type current transformer of the present utility model when adopting a detachable connection with a steel strip or a hose clamp.

[0022] Figure 3 FIG. 15 is a left view of the opening and closing runway type current transformer of the present utility model when adopting a detachable connection with a steel strip or a hose clamp.

[0023] Figure 4 FIG. 19 is a schematic diagram of the first application scenario of the opening and closing runway type current transformer of the present utility model.

[0024] Figure 5 FIG. 23 is a schematic diagram of the second application scenario of the opening and closing runway type current transformer of the present utility model.

[0025] Figure 6 FIG. 27 is a schematic diagram of the third application scenario of the opening and closing runway type current transformer of the present utility model.

[0026] Explanation of the Reference Numerals in the Drawings:

[0027] 1 - iron core; 2 - winding; 3 - epoxy resin; 4 - first half runway type housing; 5 - second half runway type housing; 6 - bolt hole; 7 - self-tapping screw; 8 - groove; 9 - limiting member; 10 - cable. Detailed Embodiments

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions of the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings of the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present utility model without creative efforts shall fall within the scope of protection of the present utility model. Unless otherwise defined, the technical terms or scientific terms used herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which the present utility model pertains.

[0029] In the description of the utility model patent application and the claims, the terms "first", "second" and similar terms do not denote any order, quantity or importance, but are only used to distinguish different components. Similarly, unless the context clearly indicates otherwise, singular terms such as "a", "an" or "the" do not denote a limitation of quantity, but mean that there is at least one. Terms such as "comprising" or "including" mean that the elements or objects appearing before "comprising" or "including" cover the features, wholes, steps, operations, elements and / or components listed after "comprising" or "including", and do not exclude the existence or addition of one or more other features, wholes, steps, operations, elements, components and / or their combinations. Terms such as "upper", "lower", "left" and "right" are only used to indicate relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0030] For some renovation projects, if the structure of the current transformer is fixed and the cables are also fixed, it is very difficult to pass a relatively large number of cables through the current transformer during installation. The current transformer needs to be detachable to meet the installation requirements of the renovation project.

[0031] Based on the above problems, the embodiment of the utility model provides an opening and closing runway type current transformer, which is convenient to adapt to the installation between the current transformer and the cables in the renovation project.

[0032] Please refer to Figure 1 As shown in the figure, the embodiment of the utility model provides an opening and closing runway type current transformer, which includes two symmetrically arranged semi-runway type housings. Define the two semi-runway type housings as the first semi-runway type housing 4 and the second semi-runway type housing 5 respectively. The first semi-runway type housing 4 and the second semi-runway type housing 5 are detachably connected to form a complete runway type housing. The cavity of the first semi-runway type housing 4 houses the iron core 1 and the winding 2 wound around the iron core 1. The cavity of the second semi-runway type housing 5 houses the iron core 1. The first semi-runway type housing 4 and the second semi-runway type housing 5 are both filled with insulating materials.

[0033] The utility model designs the housing of the current transformer in the form of a runway, and the housing is designed as two symmetrically arranged semi-runway type housings, which are detachably connected between the two symmetrically arranged semi-runway type housings, facilitating multiple cables 10 to pass through the current transformer at one time. During the installation process, there is no need to cut off the power supply, which is convenient for installation.

[0034] In some embodiments of the utility model, the first semi-runway type housing 4 and the second semi-runway type housing 5 are detachably connected up and down or left and right. The first semi-runway type housing 4 and the second semi-runway type housing 5 can be designed to be left-right symmetric or up-down symmetric, which can be specifically changed according to the actual scenario.

[0035] In some embodiments of the present utility model, the first semi - runway - shaped housing 4 and the second semi - runway - shaped housing 5 are detachably connected by fixing bolts, steel belts or hose clamps. The detachable connection methods between the first semi - runway - shaped housing 4 and the second semi - runway - shaped housing 5 are not unique, but all are easy to operate and firmly fixed.

[0036] In some embodiments of the present utility model, when the first semi - runway - shaped housing 4 and the second semi - runway - shaped housing 5 are detachably connected by fixing bolts, corresponding bolt holes 6 are respectively arranged on the outer sides of the connection parts of the first semi - runway - shaped housing 4 and the second semi - runway - shaped housing 5. When the first semi - runway - shaped housing 4 and the second semi - runway - shaped housing 5 are combined into a complete runway - shaped housing, the bolt holes 6 on the first semi - runway - shaped housing 4 and the second semi - runway - shaped housing 5 are aligned for the same bolt to be screwed in.

[0037] Please refer to Figure 2 and Figure 3 As shown, in some embodiments of the present utility model, when the first semi - runway - shaped housing 4 and the second semi - runway - shaped housing 5 are detachably connected by a steel belt or a hose clamp, grooves are provided on the peripheries of the first semi - runway - shaped housing 4 and the second semi - runway - shaped housing 5. When the first semi - runway - shaped housing 4 and the second semi - runway - shaped housing 5 are combined into a complete runway - shaped housing, the grooves on the first semi - runway - shaped housing 4 and the second semi - runway - shaped housing 5 form a circle. A steel belt or a hose clamp is embedded in the grooves. One end of the steel belt or the hose clamp is equipped with a self - tapping screw. After the steel belt or the hose clamp is embedded in the grooves and surrounds the complete runway - shaped housing for one circle, the two ends of the steel belt or the hose clamp overlap and are fixed by the self - tapping screw 7.

[0038] When the first semi - runway - shaped housing 4 and the second semi - runway - shaped housing 5 are detachably connected by a steel belt or a hose clamp, it is equivalent to bundling two separated semi - runway - shaped housings into a complete runway - shaped housing with a steel belt or a hose clamp. The grooves are used to embed the steel belt or the hose clamp to prevent the steel belt or the hose clamp from moving randomly outside the semi - runway - shaped housing.

[0039] In some embodiments of the present utility model, the depth of the groove is 2 - 3 mm, which is adapted to the thickness of the steel belt or the hose clamp.

[0040] In some embodiments of the present utility model, limiters 9 are provided on both the first semi - runway - shaped housing 4 and the second semi - runway - shaped housing 5 above the grooves. The steel belt or the hose clamp passes through below the limiters 9 and fits the grooves. The limiters 9 further prevent the steel belt or the hose clamp from falling off from the outer sides of the first semi - runway - shaped housing 4 and the second semi - runway - shaped housing 5.

[0041] In some embodiments of the present utility model, the iron core 1 is made of silicon steel sheets. Since the shape of the current transformer is runway-shaped and the magnetic circuit of the iron core 1 is long, the iron core 1 is made of high-precision cuttable silicon steel sheets to increase the resistivity and maximum magnetic permeability of the iron core 1, meeting the performance requirements of the current transformer.

[0042] In some embodiments of the present utility model, the insulating material is epoxy resin 3, improving the insulation effect.

[0043] Please refer to Figures 4 to 6 As shown, three application scenarios applicable to the embodiments of the present utility model are respectively presented.

[0044] As Figure 4 shown, in the case of installing two large cables 10 that are far apart, the two large cables 10 can first pass through the opening of the first semi-runway-shaped housing 4 of the openable runway-shaped current transformer of the embodiment of the present utility model, and then the opening of the second semi-runway-shaped housing 5 is aligned with the opening of the first semi-runway-shaped housing 4. The two large cables 10 then pass through the current transformer, and the first semi-runway-shaped housing 4 and the second semi-runway-shaped housing 5 are installed and fixed to form a complete runway-shaped housing.

[0045] As Figure 5 shown, when there are multiple cables 10 arranged side by side, the multiple side-by-side cables 10 are passed through the opening of the first semi-runway-shaped housing 4 at one time, and then the opening of the second semi-runway-shaped housing 5 is aligned with the opening of the first semi-runway-shaped housing 4. The first semi-runway-shaped housing 4 and the second semi-runway-shaped housing 5 are installed and fixed to form a complete runway-shaped housing, and the multiple side-by-side cables 10 can easily pass through the current transformer at one time.

[0046] As Figure 6 shown, in the case of installing three-phase cables 10 with a large spacing, the three-phase cables 10 can first pass through the opening of the first semi-runway-shaped housing 4 of the openable runway-shaped current transformer of the embodiment of the present utility model, and then the opening of the second semi-runway-shaped housing 5 is aligned with the opening of the first semi-runway-shaped housing 4. The three-phase cables 10 then pass through the current transformer, and the first semi-runway-shaped housing 4 and the second semi-runway-shaped housing 5 are installed and fixed to form a complete runway-shaped housing.

[0047] In summary, for a retrofit project with multiple cables 10 on the primary side, the cables 10 are already fixed and cannot be moved to pass through the current transformer. The current transformer can be opened reversely, the openable structure is first disconnected, the cables 10 are passed through, and the current transformer is closed through fixing bolts or steel belts or hose clamps, and the installation is completed.

[0048] During installation, there is no need to cut off the power supply, and it can be operated live. After closing, it can be directly put into use after being connected to the system. The installation operation is simple, reducing the labor cost.

[0049] Although the present utility model has been disclosed above with the preferred embodiments, it is not intended to limit the present utility model. Those of ordinary skill in the technical field to which the present utility model pertains can make various modifications and refinements without departing from the spirit and scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to that defined by the claims.

Claims

1. A split-track current transformer, characterized in that: The invention comprises two symmetrically arranged half-runway shells, which are defined as a first half-runway shell and a second half-runway shell respectively. The first half-runway shell and the second half-runway shell can be detachably connected to form a complete runway shell. An iron core and a winding wound on the iron core are placed in the cavity of the first half-runway shell, and an iron core is placed in the cavity of the second half-runway shell. The first half-runway shell and the second half-runway shell are both filled with insulating materials.

2. The open and close racetrack current transformer according to claim 1, characterized in that: The first half-runway type shell and the second half-runway type shell are detachably connected up and down or left and right.

3. The open and close racetrack current transformer according to claim 1, characterized in that: The first half-runway type shell and the second half-runway type shell are detachably connected via fixing bolts or steel belts or throat clamps.

4. The open and close racetrack current transformer according to claim 3, characterized in that: When the first half-runway shell and the second half-runway shell are detachably connected by fixing bolts, corresponding bolt holes are respectively arranged on the outer sides of the connection between the first half-runway shell and the second half-runway shell. When the first half-runway shell and the second half-runway shell are combined into a complete runway shell, the bolt holes on the first half-runway shell and the second half-runway shell are aligned for the same bolt to be screwed in.

5. The open and close racetrack current transformer according to claim 3, characterized in that: When the first half-runway type shell and the second half-runway type shell are detachably connected by a steel belt or a throat hoop, grooves are provided on the periphery of the first half-runway type shell and the second half-runway type shell. When the first half-runway type shell and the second half-runway type shell are combined into a complete runway type shell, the grooves on the first half-runway type shell and the second half-runway type shell form a circle, and a steel belt or a throat hoop is embedded in the groove. One end of the steel belt or the throat hoop has a self-tightening screw. After the steel belt or the throat hoop is embedded in the groove and surrounds the complete runway type shell, the two ends of the steel belt or the throat hoop overlap and are fixed by self-tightening screws.

6. The open and close racetrack current transformer according to claim 5, characterized in that: The depth of the groove is 2-3 mm.

7. The open and close racetrack current transformer according to claim 5, characterized in that: The first half-racetrack housing and the second half-racetrack housing are both provided with a limiting member located above the groove.

8. The open and close racetrack current transformer according to claim 1, characterized in that: The iron core is made of silicon steel sheet.

9. The open and close racetrack current transformer according to claim 1, characterized in that: The insulating material is epoxy resin.

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