KR102585479B1 - Transformer - Google Patents

Abstract

The present invention configures a separate tertiary winding at the bottom of the high-voltage winding to apply power to various components of the device, and shields the tertiary winding to prevent it from being affected by high voltage, thereby enabling a stable power supply to the system and a separate It relates to a transformer that saves costs by securing space by omitting the installation space for the transformer, comprising: a winding, an iron core disposed inside the winding, a first winding disposed at regular intervals around the iron core, and an insulating member disposed between the second winding, the iron core, the first winding, and the second winding and surrounding the outer surface of the second winding, and an outer periphery of the iron core at the lower end of the second winding. It includes a third winding that surrounds and is entirely shielded to prevent high voltage from flowing, and the third winding is a low voltage winding and is a separate power supply winding.

Description

Transformer

The present invention relates to a transformer, and in particular, to a transformer that is shielded so as not to be affected by high voltage, thereby stably supplying power to the system and reducing costs by reducing panel space.

In general, a transformer is used to transfer electrical energy to another electrical circuit by increasing or decreasing the voltage in an electrical circuit. Transformers like this change voltage using electromagnetic induction.

In other words, it is well known that in a transformer, when the magnetic field lines increase or decrease depending on the change in the voltage flowing through the primary coil, the voltage is induced in another coil called the secondary coil, thereby transferring electrical energy.

In addition, among the above transformers, the dry transformer uses air as the main cooling insulating medium, and is a transformer that uses electrical insulating paper, laminate, varnish, and resin to insulate the electric circuit in the atmosphere.

Usually, low-voltage windings use a voltage of less than 1000 volts, and high-voltage windings use a high voltage of more than 1000 volts, so even with epoxy casting, high voltage is induced on the outer surface of the high-voltage winding.

Therefore, in order to prevent the risk to humans who come into contact with the outer surface of the high-voltage winding, in particular, when installing the dry-type transformer indoors or outdoors, an additional external housing had to be provided, which always maintains a constant There was a problem of having to secure installation space for the transformer.

In addition, in a general dry transformer, as shown in FIG. 1, due to the potential difference between the low-voltage winding and the high-voltage winding, it was necessary to secure an insulation distance between the low-voltage winding and the high-voltage winding, and for this purpose, an insulation distance in the air medium was secured. Alternatively, an insulating film was inserted between the low-voltage winding and the high-voltage winding to supplement the insulation distance.

In addition, in a multi-phase transformer, a high voltage is induced outside each high-voltage winding, so when designing and manufacturing a transformer, a minimum air medium insulation distance between the high-voltage windings is required depending on the voltage on the high-voltage winding side between each phase.

Additionally, a certain insulation distance was required between the yoke or leg of the iron core and the high-voltage winding.

This not only increases the size of the dry-type transformer, but also poses the risk of electric shock to people, and raises the problem of having to secure a certain installation space.

The present invention was devised to solve the above problems. A separate tertiary winding is formed at the bottom of the high-voltage winding to supply power to various components of the device, and the tertiary winding is shielded to prevent it from being affected by high voltage. The purpose is to provide a transformer that enables stable power supply to the system and reduces costs by securing space by omitting a separate transformer installation space.

A transformer according to the present invention for achieving the above object includes a winding, an iron core disposed inside the winding, first and second windings disposed at regular intervals around the iron core, the iron core, an insulating member disposed between the first winding and the second winding and surrounding the outer surface of the second winding, and an insulating member disposed at the lower end of the second winding, surrounding the outer periphery of the iron core, so as to transmit the high voltage as a whole. It includes a third winding that is shielded to prevent damage, and the third winding is a low-voltage winding and is a separate power supply winding.

The transformer according to an embodiment of the present invention has the following effects.

In other words, a separate tertiary winding that supplies power to various components of the device is formed at the bottom of the high-voltage winding, and the tertiary winding is shielded to prevent it from being affected by high voltage, thereby stably supplying power to the system.

1 is a schematic diagram of a typical dry transformer.
Figure 2 is a symbol showing a transformer according to the present invention
Figure 3 is a cross-sectional view schematically showing the transformer according to the present invention.
Figure 4 is a top view showing the transformer of Figure 3
Figure 5 is a side view showing the transformer of Figure 3
Figure 6 is a perspective view schematically showing the third winding of the transformer of Figure 3
Figure 7 is a cross-sectional view of part A of the third winding in Figure 6

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. At this time, note that in the attached drawings, like components are indicated by the same symbols whenever possible. Additionally, detailed descriptions of well-known functions and configurations that may obscure the gist of the present invention will be omitted. For the same reason, some components are exaggerated, omitted, or schematically shown in the accompanying drawings.

In addition, throughout the specification, when a part is said to “include” a certain element, this means that it may further include other elements rather than excluding other elements, unless specifically stated to the contrary. In addition, throughout the specification, “on” means located above or below the object part, and does not necessarily mean located above the direction of gravity.

In the embodiments of the present invention, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by a person of ordinary skill in the technical field to which the present invention pertains. has. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and unless clearly defined in the embodiments of the present invention, have an ideal or excessively formal meaning. It is not interpreted as

In addition, in order to highlight and explain the technical features of the present invention, the illustrations in the drawings attached to the present invention show and explain some configurations of general devices/configurations/devices, etc. applied in the same technical field as the present invention. This can be omitted. Also, for the same purpose, the illustrations of some components may be enlarged or excessively highlighted, or the illustrations may be reduced or omitted, but it will be natural that these illustrations do not limit the scope of the present invention.

Before explaining the present invention, it should be noted that the drawings highlight the configuration and shape of the main parts, so the proportions and shapes may be somewhat different from those in reality.

Figure 2 is a symbol showing a transformer according to the present invention.

As shown in FIG. 2, the transformer according to the present invention includes a first winding 130 to which a voltage is applied from the outside, a second winding 140 to which the voltage applied to the second winding 140 is induced, and It is configured at the bottom of the second winding 140 to apply voltage to internal devices and includes a third winding 160 whose front surface is shielded to prevent the influence of high voltage. At this time, a shielding member 170 is installed between the first winding 130, the second winding 140, and the third winding 160, and the shielding member 170 is connected to ground.

Here, the shielding member 170 breaks the insulation between the first winding 130 and the second winding 140, so that the high voltage applied to the first winding 130 is transmitted to the second winding 140. It serves to prevent high voltage induced into the second winding 140 from being induced into the first winding 130.

Figure 3 is a cross-sectional view schematically showing the transformer according to the present invention, Figure 4 is a top view showing the transformer of Figure 3, and Figure 5 is a side view showing the transformer of Figure 3.

Additionally, Figure 6 is a perspective view schematically showing the third winding of the transformer of Figure 3, and Figure 7 is a cross-sectional view of portion A of the third winding of Figure 6.

As shown in FIGS. 3 to 5, the transformer according to the present invention has a winding 110, an iron core 120 disposed inside the winding 110, and a constant interval around the iron core 120. Between the first winding 130 and the second winding 140 and the iron core 120, the first winding 130, and the second winding 140, and the outer surface of the second winding 140 Insulating members 150 are each arranged to surround, and a third member is formed at the lower end of the second winding 140, surrounds the outer periphery of the iron core 120 and is entirely shielded to prevent high voltage. It includes a winding 160, and the third winding 160 is a low-voltage winding and is characterized as a separate power supply winding.

Here, the winding 110 has a cylindrical or square shape and has an internal space.

Meanwhile, the first winding 130 is a low-voltage winding formed internally with the shielding member 170 interposed therebetween, and the second winding 140 is formed externally with the shielding member 170 interposed therebetween. It is a high voltage winding. The first and second windings 130 and 140 are wrapped through the winding 110.

The iron core 120 uses an oriented silicon steel strip with good magnetization characteristics to facilitate the flow of magnetic flux. Here, the iron core 120 preferably contains 1 to 10% by weight of silicon (Si). If silicon is less than 1% by weight, magnetization characteristics are poor, and if it exceeds 10% by weight, iron (Fe) does not perform its role.

The iron core 120 is manufactured to be as thin as possible to minimize eddy current, and to reduce the loss of the mold transformer, cleanliness, residual stress, and surface roughness are used for low loss to improve weight and no-load loss. use it Here, the thickness of the iron core 120 is preferably 1 μm to 1 cm.

Here, when winding the first winding 130 and the second winding 140 on the iron core 120, at least one of copper sheet, insulating paper, and glass fiber is used as an insulating member 150 for insulation between them. They are wound together as they are made.

Here, the insulating member 150 is between the iron core 120 and the first winding 130, between the first winding 130 and the second winding 140, and the outer surface of the second winding 140. Each is disposed in the surrounding area to minimize heat transfer between the iron core 120, the first winding 130, and the second winding 140. Previously, the duct layer consisted of an air layer, so electrical insulation was possible, but there was a problem with heat transfer.

However, the insulating member 150 not only provides electrical insulation, but also enables miniaturization and weight reduction while minimizing heat transfer. The insulating member 150 can be manufactured in the form of an insulator film or an insulator mesh, and in some cases, the form of an insulating film and an insulating mesh can be used together. In particular, when the insulating member 150 in the form of an insulating mesh is used, the adhesive strength with the winding 110 can be increased, and the electrical properties of the winding 110 and cracking can be prevented.

Here, the insulating member 150 is selected to be heat resistant and have high heat blocking properties, and is preferably one selected from the group consisting of glass series, fiber series, silicon series, rubber series, resin series, and mixtures thereof.

At this time, as shown in FIGS. 6 and 7, the third winding 160 includes a plurality of equiangular wires 161 arranged in the longitudinal direction at regular intervals, and the equiangular wires 161 are made of polyester 162. , it is shielded by surrounding the first nomex clip (163), the mixed contact prevention plate (164), and the second nomex clip (165) in that order. The polyester 162 is configured to surround each of the concentric lines 161.

Here, the third winding 160 is composed of a winding lead 166, a Y connection 167, and a cross-contact prevention plate lead 168 that protrude at regular intervals.

The first and second nomex clips 163 and 165 are made of aromatic polyamide and can be used for a short time of 18k/mm to 45kV/mm depending on the product thickness or type without further reinforcement with resin or varnish. Can withstand electric shock.

In addition, the first and second nomex clips 163 and 165 have excellent resistance to wear and tear, have strong elasticity, and thus have mechanical strength, and have little change in mechanical and electrical properties at a temperature of 200° C., thereby ensuring thermal stability. has

In addition, the first and second nomex clips 163 and 165 are essentially unaffected by solvents and are particularly resistant to acidity and basicity, and are also suitable for all types of adhesives and varnishes, transformer oils, lubricants and refrigerants. It has sexual characteristics, is resistant to erosion by insects and fungi, and has chemical adhesion properties.

In addition, the first and second nomex clips 163 and 165 are uniquely polymeric, so they are suitable for various cryogenic devices, and have a high withstand voltage for a completely dried product in equilibrium with a relative humidity of 90%. With a strength of 90%, it is resistant to moisture, is not affected by ionizing radiation up to 800 megarads (which causes polyester bond destruction), and its electrical and mechanical properties do not change even after 8 hours of exposure, making it resistant to radiation.

When the insulation between the first winding 130 and the second winding 140 is destroyed in the anti-contact plate 164, the ground current transmitted to the low voltage side flows through the ground of the anti-contact plate 164. , it prevents potential rise in low-voltage circuits, preventing damage such as burnout and shrinkage of low-voltage equipment.

In addition, abnormal voltage such as brain impulse voltage coming from the high voltage side can be transmitted to the low voltage winding through the magnetic path of the formed iron core 120. In this case, if the space between both windings is shielded by the anti-contact plate 164, the low voltage The abnormal voltage transferred to the side can be lowered.

At this time, the anti-contact plate 164 is configured in the form of a mesh formed by crossing two or more conductors.

Additionally, the anti-contact plate 164 may include a ground lead wire for grounding.

The anti-contact plate 164 includes a metal sheet that blocks electromagnetic waves at a designated frequency, and the metal sheet has shielding performance in the 10 kHz to 1 GHz band.

The metal sheet is made of a metal that has a shielding performance of 20 dB to 80 dB in the 10 kHz to 20 MHz band, which is a magnetic field region, and a shielding performance of 80 dB or more in the 20 kHz to 1 GHz band, an electric field region.

The metal sheet is a metal surface finished with one or more of magnesium (Mg), gallium (Ga), and aluminum (Al).

The anti-contact plate 164 allows the current transmitted to the second winding 140 to flow to the ground through the anti-contact plate 164 constituting the third winding 160 when the insulation of the transformer coil is broken. By preventing the potential rise in the low-voltage circuit, it is possible to prevent burnout and electric shock of low-voltage equipment.

The metal sheet may be made of an EMP (Electro Magnetic Pulse) metal sheet, and can block electromagnetic waves of a specified frequency.

The transformer provided with the third winding 160 including the anti-contact plate 164, the anti-contact plate 164 is made of a metal sheet that blocks electromagnetic waves at a specified frequency, so that the second winding 140 Shielding performance against surges transferred to the first winding 130 can be improved.

Therefore, the transformer equipped with the third winding 160 has the advantage of protecting the electronic circuit and components connected to the third winding 160 from lightning and EMP high-frequency overvoltage.

Meanwhile, although preferred embodiments of the present invention have been described above, the scope of rights of the present invention is not limited thereto, and the scope of rights of the present invention extends to the scope substantially equivalent to the embodiments of the present invention. Various modifications can be made by those skilled in the art without departing from the spirit of the invention.

110: winding 120: iron core
130: first winding 140: second winding
150: insulating member 160: third winding
170: Shielding member

Claims (5)

winding,
An iron core disposed inside the winding,
a first winding and a second winding disposed at regular intervals around the iron core;
an insulating member disposed between the iron core, the first winding, and the second winding and surrounding an outer surface of the second winding, respectively;
At the lower end of the second winding, a third winding surrounds the outer periphery of the iron core and is entirely shielded to prevent high voltage from flowing,
The third winding is a low-voltage winding and is a separate power supply winding,
The third winding is shielded by wrapping a plurality of copper wires arranged in the longitudinal direction at regular intervals, and wrapping the copper wires in that order with polyester, first nomex clip, anti-contact plate, and second nomex clip. A transformer characterized in that.
delete The transformer according to claim 1, wherein the third winding has winding leads, Y connections, and anti-contact plate leads protruding at regular intervals.
The method of claim 1, wherein when the insulation between the first winding and the second winding is broken in the contact prevention plate, the ground current transmitted to the low voltage side flows through the ground of the contact prevention plate and the potential of the low voltage circuit rises. A transformer characterized in that it prevents damage from burnout and shrinkage of low-voltage equipment by preventing damage.
The method of claim 4, wherein the anti-contact plate is configured in the form of a mesh formed by crossing two or more conductors, includes a ground lead wire for grounding, and includes a metal sheet that blocks electromagnetic waves at a specified frequency. transformer.