CN114678203A - Manufacturing process and medium for solving balance characteristic of residual current transformer - Google Patents

Abstract

The invention provides a manufacturing process for solving the balance characteristic of a residual current transformer, which comprises the following operation steps of: wrapping the iron core, namely uniformly winding the iron core by adopting an insulating adhesive tape to prevent the iron core from being in contact with the coil in the following steps to generate short circuit; a coil winding step, namely winding an enameled wire on the iron core according to a set turn ratio; a coil insulation step, namely brushing an insulating paint layer on the surface of the enameled wire wound into a coil, and wrapping an insulating adhesive tape outside the insulating paint layer; a shielding layer mounting step, namely wrapping an oriented silicon steel sheet on a coil to be used as a shielding layer, and winding an adhesive tape outside the shielding layer for fixing, wherein the thickness of the oriented silicon steel sheet is smaller than the diameter of an enameled wire; and a packaging step, testing the assembled coil and the assembled iron core, putting the coil and the iron core which are qualified in the test into a protective box, and pouring glue into the protective box and the iron core for fixing. The invention can reduce the manufacturing cost of the mutual inductor and simultaneously improve the shielding performance of the mutual inductor.

Description

A manufacturing process and medium for solving the balance characteristics of residual current transformers

technical field

The invention relates to the technical field of the manufacturing process of a transformer, and mainly relates to a manufacturing process and a medium for solving the balance characteristic of a residual current transformer.

Background technique

Existing transformer manufacturing process such as a medium-voltage epoxy casting type current transformer coil manufacturing process with application number CN202011208283, the manufacturing process includes the following operation steps; Step 1, the iron core is buffered and wrapped; Step 2, the secondary winding is wound around Step 3, winding the primary winding; Step 4, welding the primary terminal; Step 5, wrap the primary winding with a layer of tightening material, then wrap it with buffering, and finally wrap the semi-conductor tape in half a layer; the advantage is that the two The enameled wire of the secondary winding acts as a shield, which plays the role of a uniform electric field; if the secondary winding is not shielded, it does not need to be insulated, which not only saves materials, but also shortens the production time, and achieves the effect of improving efficiency and quality.

In the above manufacturing process, the secondary winding is wrapped around the primary winding as a shield, which increases the manufacturing cost of the transformer. At the same time, the transformer composed of the secondary windings also increases the weight of the transformer, which is not conducive to the promotion and sales of the transformer.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a manufacturing process and medium for solving the balance characteristics of the residual current transformer, which can reduce the manufacturing cost of the transformer and improve the shielding performance of the transformer at the same time.

To this end, a manufacturing process for solving the balance characteristic of a residual current transformer is provided, including the following operation steps:

In the step of wrapping the iron core, insulating tape is used to evenly wrap the iron core to prevent the iron core from contacting the coil in the following steps and causing a short circuit;

In the coil winding step, the enameled wire is wound on the iron core according to the set turns ratio;

In the coil insulation step, an insulating varnish layer is applied on the surface of the enameled wire wound into a coil, and an insulating tape is wrapped around the insulating varnish layer;

In the step of installing the shielding layer, wrap the oriented silicon steel sheet on the coil as a shielding layer, and wrap the tape around the shielding layer to fix it, and the thickness of the oriented silicon steel sheet is smaller than the diameter of the enameled wire;

In the packaging step, the assembled coils and iron cores are tested, and the tested coils and iron cores are put into the protective box and fixed by pouring glue in the protective box and the iron core.

Further, the ratio of the thickness of the oriented silicon steel sheet to the diameter of the enameled wire is 0.9.

Further, the wrapping method of the oriented silicon steel sheet is to extend from the inner side wall of the coil from the top of the coil, and extend down to the bottom of the coil along the outer side wall of the coil, and return to the inner side wall of the coil from the bottom of the coil, and so on until the oriented silicon steel sheet wraps the coil. Completely wrapped.

Further, the oriented silicon steel sheet is wound into a multi-layer structure.

Further, the number of layers of the oriented silicon steel sheet is not less than five layers.

Further, the ratio of the thickness of the section of the oriented silicon steel sheet wound into a multi-layer structure to the thickness of the single oriented silicon steel sheet is greater than or equal to 7.4.

Further, the oriented silicon steel sheet is longer than the length of the coil, so that the oriented silicon steel sheet completely wraps the coil.

Further, the insulating tape is evenly wound on the surface of the coil.

Further, the iron core is a cobalt-containing iron core, and the diameter of the enameled wire is greater than 0.3 wire.

A medium storing a computer program that, when executed by a processor, implements the control method as described above.

Beneficial effects:

The invention provides a manufacturing process for solving the balance characteristic of the residual current transformer. By wrapping the oriented silicon steel sheet on the coil as a shielding layer, the thickness of the oriented silicon steel sheet is smaller than the diameter of the enameled wire. Due to the high magnetic permeability of the oriented silicon steel sheet, the The oriented silicon steel sheet is wrapped around the coil as a shielding layer, which can achieve a better shielding effect. The oriented silicon steel sheet is easy to be processed and formed, which makes the size of the processed transformer smaller and more compact, which can reduce the production cost of the transformer and improve the The shielding performance of the transformer.

The above description is only an overview of the technical solutions of the present invention, in order to be able to understand the technical means of the present invention more clearly, it can be implemented according to the content of the description, and in order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand , the following specific embodiments of the present invention are given.

Description of drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are for the purpose of illustrating preferred embodiments only and are not to be considered limiting of the invention. Also, the same components are denoted by the same reference numerals throughout the drawings. In the attached image:

Fig. 1 is the control program flow chart of the manufacturing process that solves the balance characteristic of residual current transformer in the present invention;

Fig. 2 is the shielding performance schematic diagram of oriented silicon steel sheet in the present invention;

3 is a schematic diagram of the shielding performance of oriented silicon steel sheets with different layers in the present invention;

4 is a schematic structural diagram of an electronic device of the present invention;

FIG. 5 is a schematic structural diagram of a computer-readable storage medium of the present invention.

Explanation of reference numerals: 21-processor; 22-memory; 23-storage space; 24-program code; 31-program code.

Detailed ways

The present invention will be further described with reference to the following examples.

Referring to Fig. 1, the manufacturing process for solving the balance characteristic of the residual current transformer in this embodiment includes the following operation steps:

In the step of wrapping the iron core, insulating tape is used to evenly wrap the iron core to prevent the iron core from contacting the coil in the following steps and causing a short circuit;

In the coil winding step, the enameled wire is wound on the iron core according to the set turns ratio;

In the coil insulation step, an insulating varnish layer is applied on the surface of the enameled wire wound into a coil, and an insulating tape is wrapped around the insulating varnish layer;

In the step of installing the shielding layer, wrap the oriented silicon steel sheet on the coil as a shielding layer, and wrap the tape around the shielding layer to fix it, and the thickness of the oriented silicon steel sheet is smaller than the diameter of the enameled wire;

In the packaging step, the assembled coils and iron cores are tested, and the tested coils and iron cores are put into the protective box and fixed by pouring glue in the protective box and the iron core. By wrapping the oriented silicon steel sheet on the coil as a shielding layer, the thickness of the oriented silicon steel sheet is smaller than the diameter of the enameled wire. Due to the high magnetic permeability of the oriented silicon steel sheet, wrapping the oriented silicon steel sheet outside the coil as a shielding layer can achieve better shielding In addition, the thickness of the general oriented silicon steel sheet is thinner, which is easier to be processed and formed, which makes the size of the processed transformer smaller and more compact, which can reduce the production cost of the transformer, and at the same time can reduce the weight of the transformer, which is convenient for the transformer. promotion sales.

Further, the ratio of the thickness of the oriented silicon steel sheet to the diameter of the enameled wire is 0.9.

Further, the wrapping method of the oriented silicon steel sheet is to extend from the inner side wall of the coil from the top of the coil, and extend down to the bottom of the coil along the outer side wall of the coil, and return to the inner side wall of the coil from the bottom of the coil, and so on until the oriented silicon steel sheet wraps the coil. Completely wrapped.

Further, the oriented silicon steel sheet is wound into a multi-layer structure.

Further, the number of layers of the oriented silicon steel sheet is not less than five layers, and a small number of layers will affect the shielding effect of the oriented silicon steel sheet. Five layers have met the performance requirements, and more than five layers will only increase the cost, and the effect is consistent. See the table below, it can be seen that when the working current of the transformer is 2000A, the leakage current range of 100mA-1000mA is input to the transformer in turn, and the following data are obtained:

Table 1

According to the above Table 1 and Figure 2, the same current is input, in this embodiment, after adding the shielding layer composed of five layers of oriented silicon steel sheets in this embodiment, the input current can be guaranteed to be close to the measured current, thereby ensuring that The current flowing through the transformer will not change much, solve the residual current in the transformer, and ensure the current balance of the transformer.

Further, the thickness of the grain-oriented silicon steel sheet in this embodiment is preferably less than 0.27mm, and the thickness of the cross-section of the grain-oriented silicon steel sheet wound into a multi-layer structure is greater than 2mm±1mm, and the calculated cross-section of the grain-oriented silicon steel sheet wound into a multi-layer structure The ratio of the thickness to the thickness of a single oriented silicon steel sheet is greater than or equal to 7.4. Since there is an air gap between two adjacent layers of oriented silicon steel sheets, practice has proved that if the air gap between two adjacent layers of oriented silicon steel sheets is greater than 3%, the As a result, the magnetic properties of the iron core are degraded, and the balance performance of the transformer is degraded. The shielding effect of the iron core is determined by the thickness of the oriented silicon steel sheet. If it is too thin, the performance of the transformer will decrease, and if it is too thick, the production cost of the transformer will be increased. See Table 2 and Figure 3 for details. It can be seen that in the oriented silicon steel After the sheet exceeds five layers, the actual current flowing through the transformer will not deviate significantly, but each additional layer of oriented silicon steel sheet will increase the cost by 15%, which is not conducive to the promotion of transformers, so this embodiment The grain-oriented silicon steel sheet is preferably five layers. Due to the characteristics of the oriented silicon steel sheet, a single oriented silicon steel sheet cannot make the thickness of the iron core, so it is necessary to wind the oriented silicon steel sheet to a certain thickness as a shielding layer.

Form 2

Further, the oriented silicon steel sheet is longer than the length of the coil, so that the oriented silicon steel sheet completely wraps the coil.

Further, the insulating tape is evenly wound on the surface of the coil.

Further, the iron core is a cobalt-containing iron core, and the diameter of the enameled wire is larger than 0.3 wire, so as to prevent the coil from being damaged due to long-term operation and excessive secondary resistance.

A medium storing a computer program that, when executed by a processor, implements the control method as described above.

Using oriented silicon steel as a magnetic shielding material, firstly, a ferromagnetic metal conductive material with high magnetic permeability is used to make a multi-layer sealing shell, and the transformer coil to be shielded is wrapped in it. The magnetic potential equation of the boundary condition of the medium surface, that is, the refraction principle of the magnetic induction line through the reflection of different magnetic media, the magnetic induction line is concentrated in the shielding layer, thereby reducing the influence of the external magnetic field on the space; Sensitive and stable performance; Third, strong plasticity, thinner thickness, easier to roll and form, and ensure the small size of the finished product; Fourth, for other shielding materials, oriented silicon steel has the highest cost performance.

It should be noted:

The method used in this embodiment can be transformed into program steps and devices that can be stored in a computer storage medium, and implemented by being called and executed by a controller.

The algorithms and displays provided herein are not inherently specific to any particular computer, virtual appliance, or other device. Descriptions made in a particular language are intended to disclose the best mode of the invention.

In the description provided herein, numerous specific details are set forth. It will be understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.

Similarly, it is to be understood that in the above description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together into a single embodiment, figure, or its description. This disclosure, however, should not be construed as reflecting an intention that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the Detailed Description are hereby expressly incorporated into the Detailed Description, with each claim standing on its own as a separate embodiment of this invention.

Those skilled in the art can understand that the modules in the device in the embodiment can be adaptively changed and arranged in one or more devices different from the embodiment. The modules or units or components in the embodiments may be combined into one module or unit or component, and further they may be divided into multiple sub-modules or sub-units or sub-assemblies. All features disclosed in this specification (including accompanying claims, abstract and drawings) and any method so disclosed may be employed in any combination unless at least some of such features and/or procedures or elements are mutually exclusive. All processes or units of equipment are combined. Each feature disclosed in this specification (including accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.

Furthermore, those skilled in the art will appreciate that although some of the embodiments described herein include certain features, but not others, included in other embodiments, that combinations of features of different embodiments are intended to be within the scope of the invention within and form different embodiments.

Various component embodiments of the present invention may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. Those skilled in the art should understand that a microprocessor or a digital signal processor (DSP) may be used in practice to implement some or all of some or all of some or all of the components in the apparatus for detecting the wearing state of an electronic device according to an embodiment of the present invention Function. The present invention can also be implemented as apparatus or apparatus programs (eg, computer programs and computer program products) for performing part or all of the methods described herein. Such a program implementing the present invention may be stored on a computer-readable medium, or may be in the form of one or more signals. Such signals may be downloaded from Internet sites, or provided on carrier signals, or in any other form.

For example, FIG. 4 shows a schematic structural diagram of an electronic device according to an embodiment of the present invention. The electronic device conventionally includes a processor 21 and a memory 22 arranged to store computer-executable instructions (program code). The memory 22 may be an electronic memory such as flash memory, EEPROM (Electrically Erasable Programmable Read Only Memory), EPROM, hard disk or ROM. The memory 22 has storage space 23 for storing program code 24 for performing any of the method steps in the embodiments. For example, the storage space 23 for program codes may include respective program codes 24 for implementing the various steps in the above methods, respectively. These program codes can be read from or written to one or more computer program products. These computer program products include program code carriers such as hard disks, compact disks (CDs), memory cards or floppy disks. Such a computer program product is typically a computer-readable storage medium as described in FIG. 5 . The computer-readable storage medium may have storage segments, storage spaces, etc. arranged similarly to the memory 22 in the electronic device of FIG. 4 . The program code may, for example, be compressed in a suitable form. Typically, the storage unit stores program code 31 for carrying out the steps of the method according to the invention, ie program code readable by a processor such as 21, which, when run by an electronic device, cause the electronic device to execute the various steps in the method described above.

It should be noted that the above-described embodiments illustrate rather than limit the invention, and that alternative embodiments may be devised by those skilled in the art without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention can be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In a unit claim enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, and third, etc. do not denote any order. These words can be interpreted as names.

Claims (10)

1. a manufacturing process that solves the balance characteristic of residual current transformer, is characterized in that, comprises the following operation steps: In the step of wrapping the iron core, insulating tape is used to evenly wrap the iron core to prevent the iron core from contacting the coil in the following steps and causing a short circuit; In the coil winding step, the enameled wire is wound on the iron core according to the set turns ratio; In the coil insulation step, an insulating varnish layer is brushed on the surface of the enameled wire wound into a coil, and an insulating tape is wrapped around the insulating varnish layer; In the step of installing the shielding layer, wrap the oriented silicon steel sheet on the coil as a shielding layer, and wrap the tape around the shielding layer to fix it, and the thickness of the oriented silicon steel sheet is smaller than the diameter of the enameled wire; In the packaging step, test the assembled coils and iron cores, and put the tested coils and iron cores into the protective box and fix them with glue. 2 . The manufacturing process for solving the balance characteristic of the residual current transformer according to claim 1 , wherein the ratio of the thickness of the oriented silicon steel sheet to the diameter of the enameled wire is 0.9. 3 . 3. The manufacturing process for solving the balance characteristic of the residual current transformer according to claim 1, wherein the wrapping method of the oriented silicon steel sheet is to extend from the inner side wall of the coil from the top of the coil, and extend downward along the outer side wall of the coil To the bottom of the coil, from the bottom of the coil back to the inner side wall of the coil, and so on until the oriented silicon steel sheet completely wraps the coil. 4 . The manufacturing process for solving the balance characteristic of the residual current transformer according to claim 3 , wherein the oriented silicon steel sheet is wound into a multi-layer structure. 5 . 5 . The manufacturing process for solving the balance characteristic of the residual current transformer according to claim 4 , wherein the number of layers of the oriented silicon steel sheet is not less than five layers. 6 . 6. The manufacturing process for solving the balance characteristic of the residual current transformer according to claim 5, wherein the ratio of the thickness of the section of the oriented silicon steel sheet wound into a multi-layer structure to the thickness of a single oriented silicon steel sheet is greater than or equal to 7.4 . 7 . The manufacturing process for solving the balance characteristic of the residual current transformer according to claim 5 , wherein the oriented silicon steel sheet is longer than the length of the coil, so that the oriented silicon steel sheet completely wraps the coil. 8 . 8 . The manufacturing process for solving the balance characteristic of the residual current transformer according to claim 1 , wherein the insulating tape is evenly wound on the surface of the coil. 9 . 9 . The manufacturing process for solving the balance characteristic of a residual current transformer according to claim 1 , wherein the iron core is a cobalt-containing iron core. 10 . 10. A medium storing a computer program which, when executed by a processor, implements the control method according to any one of claims 1-9.

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