KR200498037Y1 - oil immersed type transformer - Google Patents

Abstract

The present invention relates to an oil-immersed transformer, which includes a tank that accommodates the transformer body and is filled with insulating oil; an insulating oil discharge pipe connected to one upper side of the tank and guiding the insulating oil, which is discharged in a heated state after cooling the transformer body, to the outside of the tank; a radiator connected to the insulating oil discharge pipe to cool the insulating oil; an insulating oil inlet pipe connected to the radiator and the tank and guiding the insulating oil that has passed through the radiator to the tank; and a pump installed on the insulating oil inlet pipe to supply the insulating oil to the tank, wherein the insulating oil discharge pipe and the insulating oil inlet pipe have an expanded pipe structure in which the inner diameter of the portion coupled to the tank increases as it approaches the tank. It is characterized by having.

Description

Oil immersed type transformer}

The present invention relates to an oil-immersed transformer that can reduce flow noise and improve cooling performance due to the flow of insulating oil when it is circulated by a pump.

A transformer is a device that converts ultra-high voltage transmitted from a power plant, etc. into voltage that can be used in the field. Transformers play a key role in power transmission. Transformers are classified into inner core type, outer core type, and wound core type depending on their internal structure. Alternatively, transformers can be classified into dry self-cooling, dry wind-cooling, inflow self-cooling, inflow wind-cooling, inflow water-cooling, oil-oil self-cooling, oil-oil wind-cooling, and oil-oil water-cooling depending on the cooling method. In addition, they can be classified by constant, capacity, polarity, etc.

In a double-immersion transformer, the iron core and windings are placed in a tank and cooled with insulating oil. When cooling insulating oil with air, oil-immersed transformers can be classified by the presence or absence of an oil pump or blower.

Hereinafter, a conventional oil-immersed transformer will be described with reference to the drawings.

Figure 1 is a schematic diagram showing the insulating oil inflow and outflow structure of a conventional oil-immersed transformer. Figures 2 and 3 are schematic diagrams showing an enlarged insulating oil inflow and outflow structure according to Figure 1.

As shown in FIG. 1, the conventional oil-immersed transformer (1) has an iron core (12) and windings (14) stored inside a tank (10). The inside of the tank 10 is filled with insulating oil. A radiator 30 is installed outside the tank 10 to cool the insulating oil. A pump 50 is installed adjacent to the radiator 30 to supply insulating oil into the tank 10. An insulating oil discharge pipe 70 is connected to the upper side of the tank 10, and the insulating oil inside the tank 10 is discharged. An insulating oil inlet pipe 90 is connected to the lower side of the tank 10, so that insulating oil flows into the tank 10. The inflow and discharge of insulating oil is performed by forced circulation by the pump 50.

As shown in FIG. 2, the insulating oil inlet pipe 90 that introduces insulating oil into the tank 10 is very small compared to the size of the tank 10, so the insulating oil flows from the insulating oil inlet pipe 90 to the tank 10. The cross-sectional area of the inflow area increases rapidly. When insulating oil flows into the tank 10 through the insulating oil inlet pipe 90, it spreads rapidly, so eddy currents may occur. This may cause flow noise. In addition, since the inflow speed of the insulating oil flowing into the tank 10 is reduced, the insulating oil cannot be quickly supplied to the target area, resulting in a decrease in cooling efficiency.

In addition, as shown in FIG. 3, the insulating oil discharge pipe 70 through which the insulating oil flows out from inside the tank 10 is also very small compared to the size of the tank 10, so the insulating oil flows from the tank 10 to the insulating oil discharge pipe 70. The cross-sectional area of the inflow part is drastically reduced. Therefore, there is a problem of flow noise occurring due to vortex generation due to the bottleneck phenomenon. Since the cross-sectional area of the insulating oil discharge pipe 70 is small, the flow rate and flow rate of the insulating oil are reduced, so the heated insulating oil is not discharged quickly, thereby reducing cooling efficiency.

The purpose of the present invention is to provide an oil-immersed transformer that can reduce flow noise and improve cooling performance due to the flow of insulating oil when it is circulated by a pump.

The purposes of the present invention are not limited to the purposes mentioned above, and other purposes and advantages of the present invention that are not mentioned can be understood through the following description and will be more clearly understood by examples of the present invention. In addition, it will be readily apparent that the objects and advantages of the present invention can be realized by the means and combinations thereof indicated in the patent claims.

The oil-immersed transformer according to the present invention includes a tank that accommodates the transformer body and is filled with insulating oil; an insulating oil discharge pipe connected to one upper side of the tank and guiding the insulating oil, which is discharged in a heated state after cooling the transformer body, to the outside of the tank; a radiator connected to the insulating oil discharge pipe to cool the insulating oil; an insulating oil inlet pipe connected to the radiator and the tank and guiding the insulating oil that has passed through the radiator to the tank; and a pump installed between the insulating oil inlet pipe and the insulating oil discharge pipe to supply the insulating oil to the tank, wherein the inner diameter of the portion of the insulating oil discharge pipe and the insulating oil inlet pipe coupled to the tank is closer to the tank. It is characterized by having an enlarging tube structure.

A pipe having a pipe-shaped coupling pipe portion having the same diameter as the diameter of the insulating oil discharge pipe and the insulating oil inlet pipe, and an expansion portion having a pipe shape that is integrally formed at an end of the coupling pipe portion and whose diameter gradually increases toward the tank. Includes more connectors.

The pipe connector is characterized in that the pipe diameter ratio of the end of the coupling pipe and the end of the expansion is 1:1.75, and the angle of the connection portion where the coupling pipe and the expansion is connected is 160 degrees.

A pipe-shaped coupling pipe part is detachably coupled to one end of the insulating oil discharge pipe and the insulating oil inflow pipe and has a diameter equal to the diameter of the insulating oil discharge pipe and the insulating oil inflow pipe, and is formed integrally with one end of the coupling pipe part, and is integrally formed with the tank. It further includes a pipe connector having an expanded pipe having a pipe shape whose diameter gradually increases toward the end.

The pipe connector is characterized in that the pipe diameter ratio of the end of the coupling pipe and the end of the expansion is 1:1.75, and the angle of the connection portion where the coupling pipe and the expansion is connected is 160 degrees.

The pipe connector further includes a first coupling portion formed at the other end of the coupling pipe portion and coupled to the insulating oil discharge pipe or the insulating oil inlet pipe, and a second coupling portion formed at an end of the expanded pipe portion and coupled to the tank.

The oil-immersed transformer according to the present invention can reduce noise caused by the flow of insulating oil by improving the shape of the pipe through which insulating oil flows in or out. In addition, the oil-immersed transformer according to the present invention has the effect of improving cooling efficiency by reducing flow loss.

In addition to the above-mentioned effects, the specific effects of the present invention are described below while explaining the specific details for implementing the design.

Figure 1 is a schematic diagram showing the insulating oil inflow and outflow structure of a conventional oil-immersed transformer.
Figures 2 and 3 are schematic diagrams showing an enlarged insulating oil inflow and outflow structure according to Figure 1.
Figure 4 is a schematic diagram showing the structure of an oil-immersed transformer according to an embodiment of the present invention.
Figure 5 is a perspective view showing the tank and insulating oil inflow and outflow areas of the oil-immersed transformer according to Figure 4.
Figure 6 is an enlarged schematic diagram of the insulating oil discharge area of the oil-immersed transformer according to Figure 4.
Figure 7 is an enlarged schematic diagram of the insulating oil inflow area of the oil-immersed transformer according to Figure 4.
Figure 8 is a diagram comparing the results of heat flow analysis of the inflow and outflow of insulating oil between a conventional oil-immersed transformer and the oil-immersed transformer of the present invention.
Figure 9 is a diagram comparing the heat flow analysis results inside the tank according to Figure 8.
Figure 10 is a perspective view showing the tank and insulating oil inflow and outflow areas of an oil-immersed transformer according to another embodiment of the present invention.
Figure 11 is an enlarged schematic diagram of the insulating oil inflow and outflow area of an oil-immersed transformer according to embodiments of the present invention.

The above-mentioned purpose, features and advantages will be described in detail later with reference to the attached drawings, so that those skilled in the art in the technical field to which the present invention pertains will be able to easily implement the technical idea of the present invention. In explaining the present invention, if it is judged that a detailed description of known technologies related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the attached drawings. In the drawings, identical reference numerals are used to indicate identical or similar components.

Hereinafter, the “top (or bottom)” of a component or the arrangement of any component on the “top (or bottom)” of a component means that any component is placed in contact with the top (or bottom) of the component. Additionally, it may mean that other components may be interposed between the component and any component disposed on (or under) the component.

Additionally, when a component is described as being “connected,” “coupled,” or “connected” to another component, the components may be directly connected or connected to each other, but the other component is “interposed” between each component. It should be understood that “or, each component may be “connected,” “combined,” or “connected” through other components.

Figure 4 is a schematic diagram showing the structure of an oil-immersed transformer according to an embodiment of the present invention. Figure 5 is a perspective view showing the tank and insulating oil inflow and outflow areas of the oil-immersed transformer according to Figure 4. Figure 6 is an enlarged schematic diagram of the insulating oil discharge area of the oil-immersed transformer according to Figure 4. Figure 7 is an enlarged schematic diagram of the insulating oil inflow area of the oil-immersed transformer according to Figure 4.

As shown in Figures 4 and 5, the oil-immersed transformer 100 according to an embodiment of the present invention includes a transformer body 110 including a winding 114 and an iron core 112, and a transformer body 110. It includes a tank 120 that accommodates. In addition, the oil-immersed transformer 100 includes a radiator 130 installed outside the tank 120, an insulating oil inlet pipe 150 and an insulating oil discharge pipe 140 connecting the radiator 130 and the tank 120, and an insulating oil It includes a pump 160 that supplies. A pipe connector 170 is installed between the insulating oil inlet pipe 150 and the tank 120 and between the insulating oil discharge pipe 140 and the tank 120, respectively.

Tank 120 accommodates transformer body 110. The inside of the tank 120 is filled with insulating oil that insulates and cools the transformer body 110 and various components. Tank 120 may be made of cold rolled steel, for example. The tank 120 is made with mechanical strength in mind to prevent deformation from internal pressure, transportation, and various impacts.

The transformer body 110 may include an iron core 112, a winding 114, and a support plate (not shown) to support them. In this design, only the iron core 112 and winding 114, which are the main heat generation sources, will be described.

The iron core 112 is also called a core and is a component that forms a magnetic circuit. The iron core 112 may be formed, for example, by insulating and laminating high permeability electrical steel sheets (oriented silicon steel sheets) that do not undergo aging. After the iron core 112 is stacked as needed, the upper and lower ends are supported by the above-described support plates and installed in the transformer body 110.

The winding 114 is also called a coil and is composed of a linear conductor wound into a ring shape. Winding 114 has a predetermined turns ratio so that the voltage can be varied. The winding 114 is made by covering a wire with good conductivity, such as copper or aluminum, with an insulating material and winding it in a cylindrical or threaded shape. A layer wound in a ring like this is called a ‘turn’. Insulators are inserted at regular intervals between the plurality of turns.

The transformer body 110 described above is accommodated in the tank 120 and is cooled and insulated by insulating oil. That is, the insulating oil is supplied between the transformer bodies 110 to cool and insulate the transformer bodies 110. The insulating oil is cooled in the radiator 130 provided outside the tank 120 and then supplied into the tank 120 by the pump 160.

The radiator 130 circulates inside the tank 120 and exchanges heat with the transformer body 110 to cool the heated insulating oil. The radiator 130 brings the insulating oil into contact with the refrigerant and cools it by taking heat from the insulating oil through heat exchange with the refrigerant. The radiator 130 can cool the insulating oil by air-cooling or water-cooling. Since the radiator 130 can be configured by applying a general heat exchanger, a detailed description of the radiator 130 will be omitted.

An insulating oil discharge pipe 140 that guides the insulating oil discharged from the tank 120 to the radiator 130 is coupled to one side of the radiator 130. An insulating oil inlet pipe 150 that guides the insulating oil discharged from the radiator 130 to the tank 120 is coupled to the other side of the radiator 130. A pump 160 is installed on the insulating oil inlet pipe 150. In this design, the insulating oil discharge pipe 140 is installed on the upper side of the tank 120, and the insulating oil inlet pipe 150 is installed on the lower side of the tank 120 as an example. In addition, the insulating oil discharge pipe 140 and the insulating oil inlet pipe 150 will be described as an example of being installed on the same plate surface of the tank 120.

The insulating oil discharge pipe 140 is connected to one upper side of the tank 120. The insulating oil discharge pipe 140 serves as a flow path that guides the insulating oil discharged from the tank 120 to the radiator 130 when the pipe connector 170 is connected. After cooling and insulating the inside of the tank 120, the insulating oil is heated, so the insulating oil rises upward inside the tank 120. Therefore, it is preferable that the insulating oil discharge pipe 140 for discharging the insulating oil is connected to the upper side of the tank 120.

The insulating oil inlet pipe 150 is connected to one lower side of the tank 120. The insulating oil inlet pipe 150 serves as a flow path to guide the insulating oil supplied by the pump 160 to the tank 120 after being cooled in the radiator 130.

The pump 160 flows insulating oil into the tank 120 by pressure. The pump 160 is installed on the insulating oil inlet pipe 150 between the radiator 130 and the tank 120. However, the pump 160 need only be placed between the insulating oil discharge pipe 140 and the insulating oil inlet pipe 150. The radiator 130 is refilled with insulating oil equal to the amount of insulating oil drained from the radiator 130 into the tank 120 by the pump 160. This is because the insulating oil heated inside the tank 120 is discharged along the insulating oil discharge pipe 140 equal to the amount of insulating oil supplied to the tank 120.

Meanwhile, pipe connectors 170 are installed between the insulating oil discharge pipe 140 and the insulating oil inlet pipe 150, respectively.

As shown in FIG. 5, the pipe connector 170 is coupled between the ends of the insulating oil discharge pipe 140 and the insulating oil inlet pipe 150 and the tank 120, respectively. The pipe connector 170 includes a coupling pipe portion 172 coupled to the insulating oil discharge pipe 140 or the insulating oil inlet pipe 150, and an expansion portion 174 formed integrally with the coupling pipe portion 172. A first coupling portion 176 and a second coupling portion 178 are provided at the ends of the coupling tube portion 172 and the expanded tube portion 174.

The coupling pipe portion 172 has a pipe shape having the same diameter as the insulating oil discharge pipe 140 or the insulating oil inlet pipe 150. A first coupling portion 176 is formed at one end of the coupling pipe portion 172, and an expansion portion 174 is formed integrally with the other end.

One end of the expanded tube 174 is formed integrally with the end of the coupling tube 172, and the other end is extended and expanded. That is, the expanded pipe portion 174 has a pipe shape whose diameter gradually increases from one end of the coupling pipe portion 172 toward the tank 120. A second coupling portion 178 is provided at the expanded end of the expansion portion 174.

The first coupling portion 176 and the second coupling portion 178 are parts that couple the pipe connector 170 to the end of the insulating oil discharge pipe 140 or the insulating oil inflow pipe 150 and the tank 120.

The first coupling portion 176 is formed at one end of the coupling pipe portion 172 and is formed in a ring shape along the outer peripheral surface of the coupling pipe portion 172. The first coupling portion 176 must be coupled to the insulating oil discharge pipe 140 on the outside of the coupling pipe portion 172 so as not to impede the movement of the insulating oil when the coupling pipe portion 172 and the insulating oil discharge pipe 140 are coupled. Accordingly, the first coupling portion 176 is formed on the outer peripheral surface of the coupling pipe portion 172 so that it can be coupled to the insulating oil discharge pipe 140 on the outside of the coupling pipe portion 172.

The first coupling portion 176 has a predetermined thickness so that it can be coupled to the insulating oil discharge pipe 140 by fastening members such as bolts and nuts. The insulating oil discharge pipe 140 is also provided with a coupling portion having a shape corresponding to the first coupling portion 176 and is coupled to each other, thereby coupling the pipe connector 170 and the insulating oil discharge pipe 140 to each other.

The second coupling portion 178 is formed at one end of the expansion portion 174 and is formed in a ring shape along the outer peripheral surface of the expansion portion 174. The second coupling portion 178 must also be coupled to the tank 120 from the outside of the expansion portion 174 so as not to impede the movement of insulating oil when the expansion portion 174 and the tank 120 are coupled. Accordingly, the second coupling portion 178 is formed on the outer peripheral surface of the expanded tube 174 so that it can be coupled to the tank 120 on the outside of the expanded tube 174.

The second coupling portion 178 also has a predetermined thickness so that it can be coupled to the tank 120 by a fastening member. A coupling portion having a shape corresponding to the second coupling portion 178 is also provided on the tank 120, so that the pipe connector 170 and the tank 120 are coupled to each other.

Since the insulating oil discharge pipe 140 and the insulating oil inlet pipe 150 have the same shape, the structure in which the pipe connector 170 connects the insulating oil inlet pipe 150 and the tank 120 is also the same as the above-described structure.

In the pipe connector 170 of the above-described structure, when insulating oil is discharged from the tank 120 to the insulating oil discharge pipe 140, the insulating oil flows into the coupling pipe portion 172 through the expansion pipe 174. The expanded pipe portion 174 has a diameter that gradually decreases from the tank 120 side to the coupling pipe portion 172. Therefore, the passage through which the insulating oil moves does not suddenly narrow but gradually decreases (see Figure 6).

Conversely, when insulating oil flows from the insulating oil inlet pipe 150 to the tank 120, the insulating oil flows into the tank 120 from the coupling pipe part 172 through the expansion part 174. The expansion portion 174 has a diameter that gradually increases toward the tank 120. Therefore, the passage through which the insulating oil moves does not suddenly widen, but gradually widens (see Figure 7).

In the oil-immersed transformer according to an embodiment of the present invention having the above-described structure, the cooling temperature is compared with the conventional structure as follows.

Figure 8 is a diagram comparing the results of heat flow analysis of the inflow and outflow of insulating oil between a conventional oil-immersed transformer and the oil-immersed transformer of the present invention. Figure 9 is a diagram comparing the heat flow analysis results inside the tank according to Figure 8.

The flow of fluid inside a pipe causes the generation of vortices in sections where the flow path is rapidly narrowed or rapidly expanded. When vortices occur, pressure loss occurs, noise increases, and cooling efficiency decreases. Therefore, if vortex generation is reduced by eliminating the sharply narrowed or sharply widened section of the flow path, flow noise is reduced and cooling efficiency is increased. For this purpose, the present design is provided with an expansion structure.

The heat flow analysis in FIGS. 8 and 9 was conducted under the following conditions.

The size of the tank 120 applied to this heat flow analysis is 0.15 ㎥, the size of the heating element corresponding to the transformer body 110 is 0.014 ㎥, and the loss per volume of the heating element at this time is 50,000 W/㎥. The insulating oil flow rate in the insulating oil inlet pipe 150 is 1 m/s, and the insulating oil temperature in the insulating oil inlet pipe 150 is 60 degrees Celsius.

The temperature difference of the heating element according to the conventional insulating oil inflow and outflow structure (A) without an expansion part and the insulating oil inflow and outflow structure of the present invention (B) with an expansion part 174 are shown in Table 1 below.

division A B Difference (A-B) K 364.0 357.4 6.6 ℃ 90.9 84.3 6.6 % 100 92.7 7.3

As shown in the table above and in FIGS. 8 and 9, when comparing the conventional insulating oil inflow and outflow structure (A) without the expansion part structure and the insulating oil inflow and outflow structure (B) of the present invention equipped with the expansion part 174, the present invention It can be seen that the temperature of the insulating oil and the transformer body 110, which is the heating element, is lower. If the temperature of the conventional transformer main body 110 is considered as a standard (100%), the temperature of the transformer main body 110 of the present invention is about 7.3% lower than the conventional temperature.

That is, in the oil-immersed transformer 100 of the present invention having the expansion pipe 174 structure, the temperature of the insulating oil flowing into the tank 120 is lower than that of the conventional structure, so it can be seen that the cooling efficiency is improved.

Looking at the flow of insulating oil flowing into the insulating oil inlet pipe 150, it can be seen that in the conventional structure, the insulating oil rapidly spreads as it exits the insulating oil inlet pipe 150 and generates a vortex. However, in the structure of the present invention, the insulating oil gradually spreads as it passes through the expansion part 174, so it can be seen that the generation of eddy currents is small. Since the generation of eddy currents leads to flow loss, it can be seen that the insulating oil inflow and outflow structure of the present invention, which generates less eddy currents in the insulating oil, produces less flow noise than the conventional structure.

In addition, since the flow loss is small due to the generation of eddy currents in the insulating oil, more can be supplied more quickly from the radiator to the cooled transformer body 110, thereby improving cooling efficiency.

Therefore, when connecting the insulating oil discharge pipe 140 and the insulating oil inlet pipe 150 to the tank 120, applying the pipe connector 170 with the expansion part 174 has the effect of minimizing flow noise and improving cooling efficiency. .

In the oil-immersed transformer according to an embodiment of the present invention having the above-described configuration, the location of the insulating oil discharge pipe 140 may vary depending on the installation environment.

Figure 10 is a perspective view showing the tank and insulating oil inflow and outflow areas of an oil-immersed transformer according to another embodiment of the present invention.

As shown in FIG. 10 , the insulating oil discharge pipe 140 and the insulating oil inlet pipe 150 through which insulating oil flows in and out may be connected on different planes of the tank 120 . Even though the insulating oil discharge pipe 140 and the insulating oil inlet pipe 150 are connected on different planes, the insulating oil discharge pipe 140 is disposed above the insulating oil inlet pipe 150. In this embodiment, the insulating oil inlet pipe 150 is provided on one side of the tank 120, and the insulating oil discharge pipe 140 is provided on the top of the tank 120.

In this case, the structure of the pipe connector 170 connecting the tank 120 and the insulating oil discharge pipe 140, and the tank 120 and the insulating oil inlet pipe 150 is applied the same as in the above-described embodiment (detailed configuration is Since it is the same as in the above-described embodiment, the description will be omitted).

Although not shown in the drawing, the insulating oil inlet pipe 150 may be connected to one side of the tank 120, and the insulating oil discharge pipe 140 may be provided on the upper side of the other side of the tank 120 facing the insulating oil inlet pipe 150. there is.

The diameter and angle of the pipe connector in the oil-immersed transformer according to the embodiments of the present invention having the above-described configuration will be described as follows (for convenience, the description is based on the configuration of the first embodiment).

Figure 11 is an enlarged schematic diagram of the insulating oil inflow and outflow area of an oil-immersed transformer according to embodiments of the present invention.

As shown in FIG. 11, the pipe connector 170 is formed so that the pipe diameter (pipe diameter, R1) of the coupling pipe portion 172 and the end pipe diameter (R2) of the expanded pipe portion 174 have a ratio of 1:1.75. You can. For example, if the pipe diameter (R1) of the coupling pipe portion 172 is 80 pi (Ø), the end pipe diameter (R2) of the expansion pipe portion 174 may be 140 pi (Ø).

In addition, the pipe connector 170 has an angle between one side of the outer peripheral surface of the coupling pipe portion 172 and one side of the outer peripheral surface of the expanded pipe portion 174 when viewed based on the connection portion connected to the coupling pipe portion 172 and the expansion portion 174. (θ1) can achieve 160 degrees. In other words, the angle θ2 between one side of the inner peripheral surface of the coupling pipe portion 172 and one inner peripheral surface of the expanded pipe portion 174 is 20 degrees.

The tube diameter ratio of the above-described coupling pipe portion 172 and the expansion portion 174 and the angle of the connection portion of the coupling pipe portion 172 and the expansion portion 174 are values according to the structure of the expansion portion 174 of the present invention described in FIG. It is limited. This is an experimental value and is the optimal value range that can keep the temperature of the transformer body 110, which is a heating element, lower than the conventional insulating oil inflow and outflow structure without an expansion pipe (A in the table).

Due to this structure, the oil-immersed transformer of the present invention not only reduces noise due to the flow of insulating oil, but also reduces flow loss, thereby improving cooling efficiency.

The above-described present invention is capable of various substitutions, modifications and changes without departing from the technical spirit of the present invention to those skilled in the art to which the present invention belongs, and thus the above-described embodiments and the accompanying drawings It is not limited by .

100: Immersion transformer 110: Transformer body
120: tank 130: radiator
140: discharge pipe 150: inlet pipe
160: pump 170: pipe connector
172: combined tube part 174: expanded tube part
176: first coupling portion 178: second coupling portion

Claims (6)

A tank that accommodates the transformer body and is filled with insulating oil;
an insulating oil discharge pipe connected to one upper side of the tank and guiding the insulating oil, which is discharged in a heated state after cooling the transformer body, to the outside of the tank;
a radiator connected to the insulating oil discharge pipe to cool the insulating oil;
an insulating oil inlet pipe connected to the radiator and the tank and guiding the insulating oil that has passed through the radiator to the tank;
a pump installed between the insulating oil inlet pipe and the insulating oil discharge pipe to supply the insulating oil to the tank; and
A pipe having a pipe-shaped coupling pipe portion having the same diameter as the diameter of the insulating oil discharge pipe and the insulating oil inlet pipe, and an expansion portion having a pipe shape that is integrally formed at an end of the coupling pipe portion and whose diameter gradually increases toward the tank. connector
Including,
The insulating oil discharge pipe and the insulating oil inlet pipe have an expanded pipe structure in which the inner diameter of the portion coupled to the tank becomes larger as it approaches the tank.
Immersed transformer.
delete According to paragraph 1,
The pipe connector is
The tube diameter ratio of the end of the coupling pipe and the end of the expansion is 1:1.75, and the angle of the connection portion where the coupling pipe and the expansion is connected is 160 degrees.
Immersed transformer.
According to paragraph 1,
A pipe-shaped coupling pipe part is detachably coupled to one end of the insulating oil discharge pipe and the insulating oil inflow pipe and has a diameter equal to the diameter of the insulating oil discharge pipe and the insulating oil inflow pipe, and is formed integrally with one end of the coupling pipe part, and is integrally formed with the tank. Further comprising a pipe connector having an expanded pipe having a pipe shape whose diameter gradually increases toward the end.
Immersed transformer.
According to clause 4,
The pipe connector is
The tube diameter ratio of the end of the coupling pipe and the end of the expansion is 1:1.75, and the angle of the connection portion where the coupling pipe and the expansion is connected is 160 degrees.
Immersed transformer.
According to clause 5,
The pipe connector is
A first coupling portion formed at the other end of the coupling pipe portion and coupled to the insulating oil discharge pipe or the insulating oil inlet pipe, and a second coupling portion formed at an end of the expanded pipe portion and coupled to the tank.
Immersed transformer.

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