KR102259422B1 - Cooling apparatus for mold type transformer - Google Patents

Abstract

The mold transformer cooling device of the present invention includes: a housing formed with an intake port on the lower portion and an exhaust box on the upper portion to surround the mold transformer; a lower housing enclosing a winding and a high-voltage terminal charging portion of the mold transformer in the housing; an air flow guide plate for guiding the cooling air introduced into the intake port of the housing to the heating part of the mold transformer; and an upper housing sealing the space between the air flow guide plate and the exhaust box.

Description

COOLING APPARATUS FOR MOLD TYPE TRANSFORMER

The present invention relates to an environmentally friendly mold transformer cooling device used indoors, and more particularly, to a mold transformer cooling device capable of simultaneously improving cooling efficiency and energy use efficiency.

Conventionally, in order to cool the heat generated by the mold transformer in the housing, the lower part of the housing is perforated so that cold air from the outside flows into the housing, and an exhaust fan is installed in the rear or side upper part of the mold transformer collected on the upper part of the housing. It was common to discharge the generated heat to the outside.

In this case, most of the inlet air does not pass through the heating part inside the winding of the molded transformer, and is discharged while circling around the molded transformer inside the enclosure, and the transformer is not properly cooled and overheated, causing many difficulties.

In particular, in the summer season, due to the poor cooling efficiency of the mold transformer, the door is opened and the blower is additionally operated, or a separately manufactured cooling fan is installed and operated under the transformer. In addition, the indoor temperature rises because the heat generated by the transformer in the indoor power room cannot be discharged to the outside of the building, which increases the cooling load of the building.

This increase in indoor temperature makes it difficult to cool the transformer, and the additional blower power consumption and the increase in cooling load further overheat the transformer, a vicious cycle of causes and consequences. In some cases, the power receiving transformer eventually breaks down or leads to a fire accident.

As an example of a conventional technology, an exhaust duct is installed on the concrete foundation of a molded transformer, and an exhaust duct is installed on the ceiling after closing the outer circumferential surface of the mold transformer winding and the housing, an effective method of discharging the heat that has cooled the transformer to the outside However, as the number of components for power reception facilities built into the enclosure increases and the size of the enclosure increases, it is difficult to apply this technology any more in terms of economy and efficiency.

In order to solve the problem of cooling the mold transformer in the indoor power receiving facility, the existing unreasonable cooling method of the mold transformer is improved to implement an eco-friendly technology that simultaneously improves the cooling efficiency and the energy use efficiency.

Republic of Korea Patent Publication No. 10-1642118 (2016.07.18) Republic of Korea Patent Publication No. 10-1931062 (2018.12.13)

The object of the present invention was proposed to solve the problems in consideration of the existing problems, and while installing a lower housing with a safety door between the housing and the mold transformer, the upper side of the lower housing is sealed, and the winding side of the mold transformer has a narrow air container. By increasing the resistance of the air flow moving from the lower housing to the upper housing by installing an air flow guide plate that forms a furnace, the cooling air flows intensively into the inner winding of the mold transformer and radiates from the outer winding surface of the mold transformer. The object of the present invention is to provide an efficient mold transformer cooling device that uniformly cools the entire mold transformer heating part by inducing the heated heat to be discharged to the upper housing at an appropriate speed.

A mold transformer cooling apparatus according to an embodiment of the present invention for solving the above technical problem includes: a housing formed with an intake port in the lower part and an exhaust box in the upper part to surround the mold transformer; a lower housing enclosing a winding and a high-voltage terminal charging portion of the mold transformer in the housing; an air flow guide plate for guiding the cooling air introduced into the intake port of the housing to the winding heating part of the mold transformer; and an upper housing sealing the space between the air flow guide plate and the exhaust box.

As another embodiment, the lower housing of the present invention is installed so as to float at a predetermined distance from the bottom of the housing while wrapping the front, rear, left and right sides of the mold transformer with a predetermined distance between the housing and the mold transformer.

As another embodiment, the front and rear sides of the lower housing of the present invention are characterized in that each safety door is installed to block access to the charging part of the mold transformer.

As another embodiment, the safety door of the present invention is characterized in that a transparent window is installed to facilitate the inspection of the mold transformer.

As another embodiment, the safety door of the present invention is characterized in that it is a double door type.

As another embodiment, the air flow guide plate of the present invention is located on the upper side of the outer periphery of the winding of the mold transformer, characterized in that it is installed horizontally on the interface between the upper housing and the lower housing.

As another embodiment, the winding 12 of the present invention is composed of an inner low-pressure winding 12a and an outer high-pressure winding 12b with the core as the center, and the air flow guide plate 40 increases the air flow resistance. is installed horizontally on the interface between the upper housing 50 and the lower housing 30 so that the cooling air is supplied to the space between the iron core 14 and the low-pressure winding 12a, the low-pressure winding 12a and the low-pressure winding 12a. Through the space between the high-pressure winding (12b) and the space between the high-pressure winding (12b) and the lower housing (30), it is characterized in that it flows from the intake port to the upper housing.

As another embodiment, it is characterized in that at least one opening and closing door is installed on one side or upper side of the exhaust box of the present invention to manually open and take emergency measures when a failure occurs in the exhaust system of the exhaust fan and the exhaust duct.

The mold transformer cooling device of the present invention installs a lower housing floating at a certain distance from the bottom of the housing while wrapping around the winding and high-voltage terminal charging part of the mold transformer between the mold transformer and the housing to complement the structure of the installation space around the winding. And, by installing an air flow guide plate that creates a narrow air passage on the outer circumferential side of the winding at the interface between the lower housing and the upper housing, the air flow resistance is increased, and the natural convection phenomenon in the inner layer of the winding and the inner space of the lower housing and It is possible to increase the forced convection phenomenon by driving, and thereby, by efficiently cooling the temperature of the winding heating part of the molded transformer, there is an advantage that the transformer burnout accident can be prevented in advance.

In addition, if a simple device is added and the exhaust fan is driven by feeding back the transformer winding temperature, the temperature distribution of the transformer heating part can be controlled in an optimal state, so the performance improvement effect of extending the life of the transformer can be expected.

In addition, by discharging the heat generated by the transformer collected in the exhaust box to the outside of the building, the ambient temperature of the transformer is lowered, which not only reduces the power consumption of the cooling fan, but also has an eco-friendly effect in that the cooling energy of the building is greatly saved.

In addition, the mold transformer cooling device of the present invention has a structure in which a safety door is installed in the lower housing surrounding the mold transformer and a transparent window is installed in the safety door. It has the advantage of having the convenience and safety of being able to prevent a safety accident in advance and checking the state of the mold transformer through a transparent window without opening the safety door.

1 is a front view of the inside of the enclosure showing a mold transformer cooling device according to the present invention;
2 is a longitudinal sectional view taken along line AA of FIG. 1;
FIG. 3 is a cross-sectional view taken along line BB of FIG. 1 .

In order to fully understand the present invention, preferred embodiments of the present invention will be described with reference to the accompanying drawings. The embodiments of the present invention may be modified in various forms, and the scope of the present invention should not be construed as being limited to the embodiments described in detail below. Accordingly, the shape of the element in the drawings may be exaggerated to emphasize a clearer description. It should be noted that in each drawing, the same configuration may be indicated by the same reference numeral. Detailed descriptions of known functions and configurations that are determined to unnecessarily obscure the subject matter of the present invention will be omitted.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 to 3, the mold transformer cooling device of the present invention includes a housing 20 having an intake port 22 on the lower side and an exhaust box 24 on the upper portion to surround the mold transformer 10; a lower housing 30 surrounding the winding 12 and the high voltage terminal 13 charging portion of the mold transformer 10 in the housing 20; an air flow guide plate 40 for guiding the cooling air introduced into the intake port 22 of the housing 20 to the heat generating part inside and outside the winding 12 of the mold transformer 10; and an upper housing 50 sealing the space between the air flow guide plate 40 and the exhaust box 24 .

That is, at the center of the winding 12, three iron cores 14 for each phase passing through the winding 12 are positioned, and the phase and the magnetic circuit constituting the iron core 14 and the magnetic circuit are located. The lower iron core 14 is coupled to upper and lower frames 16 and 17 via a bolt 15 , and the upper and lower frames 16 and 17 and the phases of each phase winding 12 . · The lower surface is coupled via a spacer (18).

At this time, the spacer 18 is fixed to form a cylindrical air passage with a predetermined interval between the iron core 14 and the low-voltage winding 12a and between the low-voltage winding 12a and the high-voltage winding 12b.

Here, the low-voltage lead-out conductor 19 is connected to one side of the upper side of the low-voltage winding 12a, and the upper end of the low-voltage winding 12a is a low-voltage support insulator 19a installed on one side of the ceiling of the housing 20. is connected, and the high-voltage terminal 13 protrudes from one side of the outer circumferential surface of the high-voltage winding 12b to conduct electricity.

The enclosure 20 is provided with a double door type enclosure door 26 having an intake port 22 formed thereon so that external cooling air flows into the inside through the lower part of the enclosure 20 on the front and rear sides, respectively, and a mold transformer is installed on the upper ceiling. An exhaust box 24 is installed to collect the transformer heat generated in (10) and discharge it to the outside.

At this time, in the exhaust box 24, when the temperature of the winding 12 of the mold transformer 10 increases, the exhaust fan 24a and one side exhaust fan 24a are connected to the outside of the building or air conditioning duct to be driven by a temperature control means (not shown). The duct 24b is installed, and when a failure occurs in the exhaust system such as the exhaust fan 24a and the exhaust duct 24b on one side or the upper surface, manually open the exhaust box 24 to take emergency measures at least 1 More than one opening/closing door 24c is provided.

The lower housing 30 is installed so as to float at a predetermined distance from the bottom of the housing 20 while enclosing the front and rear and left and right sides of the mold transformer 10 between the housing 20 and the mold transformer 10, and the front side A double-door type safety door 32 is installed at the rear and side to block access to the charging part of the mold transformer 10, respectively.

The air flow guide plate 40 is located on the upper side of the outer periphery of the winding 12 of the mold transformer 10 and is horizontally installed on the interface between the upper housing 50 and the lower housing 30 and the lower housing 30 ) and the mold transformer 10, a narrow air passage is formed between the outer peripheral surface of the winding 12 to increase the air flow resistance, and the cooling air introduced into the suction port 22 is supplied to each phase winding 12 of the mold transformer 10. ), three air outlet holes 42 are formed to pass evenly through the inner and outer surfaces.

The upper housing 50 seals the space between the air flow guide plate 40 and the upper exhaust box 24 of the housing 20, the mold transformer 10 winding 12 and the iron core 14. Let the heat generated in the upper exhaust box (24) be collected.

In addition, the lower housing 30, the upper housing 50, the air flow guide plate 40, etc., it is preferable to appropriately use a material in consideration of electrical insulation, heat insulation, durability, and impact resistance, in particular, the mold transformer (10). ) In consideration of the ease of internal inspection, it is installed using a transparent material in the necessary parts including the transparent window 34.

The operation and effect of the cooling device for the mold transformer of the present invention configured as described above will be described.

First, when external air flows into the housing 20 through the intake port 22 formed under the double door type housing door 26, the exhaust installed on the ceiling of the housing 20 when the temperature of the winding 12 is low. The fan 24a is not driven.

However, when the temperature starts to rise from the inside of the winding 12 and the air inside the winding 12 is gradually heated, the air density is lowered and the air density is lowered to move the upper part of the winding 12 to the exhaust box 24 through the upper housing 50. Cooling is performed by a natural convection phenomenon in which the air is discharged, and at the same time, external air flows into the winding 12, which is the heating part of the mold transformer 10, through the intake port 22.

At this time, since the winding 12 has a structure in which the low-voltage winding 12a and the high-voltage winding 12b are installed on the inside and the high-voltage winding 12b on the outside with the iron core 14 as the center, the iron core 14 - the low-voltage winding 12a layer and the low-voltage winding (12a) - In the high-pressure winding (12b) layer, the heating parts are dense and a narrow cooling passage is formed, whereas between the high-pressure winding (12b) and the enclosure (20) a large space is formed with a relatively small amount of heat, so it is natural Because the convection phenomenon is insignificant, the flow of air hardly occurs.
So, the present invention remodels the existing safety door 32 installed between the winding 12 and the housing 20 to complement the installation space structure of the winding 12 and wraps the winding 12 and the high-voltage terminal 13. Installing the lower housing 30 floating at a certain distance from the bottom of the housing 20 while giving it, and located at the interface between the lower housing 30 and the upper housing 50 to form a narrow air passage toward the winding 12 By installing the air flow guide plate 40, the air flow resistance is increased so that the cooling air flows evenly over the inner layer of the winding 12 and the outer surface of the winding 12 of the mold transformer 10, which is a heating part. That is, by smoothing the balanced natural convection phenomenon of cooling air in the main heating part such as the low-pressure winding 12a layer and the high-pressure winding 12b surface of the mold transformer 10 and forced convection by driving the exhaust fan 24a, It greatly enhances the cooling effect.

That is, the air flow guide plate 40 is installed horizontally on the interface between the upper housing 50 and the lower housing 30 to increase the air flow resistance, and the cooling air flows between the iron core 14 and the low pressure winding. Through the space between (12a), the space between the low-pressure winding 12a and the high-pressure winding 12b, and the space between the high-pressure winding 12b and the lower housing 30, from the intake port to the upper housing As a flow, it greatly enhances the cooling effect.

And since the lower housing 30 of the present invention has a structure in which a safety door 32 is installed and a transparent window 34 is installed in the safety door 32, in addition to the role of increasing the airflow resistance with the mold transformer 10, the mold It provides a role to check the state of the mold transformer 10 through the transparent window 34 while blocking the access to the charging part of the transformer (10).

That is, when the operator opens the housing door 26 and enters the housing 20 to inspect the surrounding facilities such as the mold transformer 10 in a narrow space, the lower housing 30 and the safety door 32 are the negligence of the worker. It prevents a safety accident in contact with the upper charging part in advance, and provides convenience and safety to check the state of the mold transformer 10 through the transparent window 34 without opening the safety door 32 .

In addition, the use of transparent materials is expanded in the necessary parts of the upper and lower housings 50 and 30, including the transparent window 34, to promote the convenience of internal inspection of the mold transformer 10.

On the other hand, the present invention is not limited to the above-described embodiments, but can be implemented with modifications and variations within the scope not departing from the spirit of the present invention, and the technical idea to which such modifications and variations are applied should also be regarded as belonging to the following claims. do.

10: mold transformer 12: winding
12a: low pressure winding 12b: high voltage winding
13: high voltage terminal 14: iron core
15: bolt 16: upper frame
17: lower frame 18: spacer
19: low pressure lead-out conductor 19a: low pressure insulator
20: enclosure 22: intake port
24: exhaust box 24a: exhaust fan
24b: exhaust duct 24c: opening and closing door
26: enclosure door 30: lower housing
32: safety door 34: transparent window
40: air flow guide plate 42: air exhaust hole
50: upper housing

Claims (8)

a housing 20 having an intake port 22 at the lower portion and an exhaust box 24 formed at the upper portion to surround the mold transformer 10;
a lower housing 30 surrounding the winding 12 and the high-voltage terminal 13 charging portion of the mold transformer 10 in the housing 20;
an air flow guide plate 40 for guiding the cooling air introduced into the intake port 22 of the housing 20 to the heating part of the winding 12 of the mold transformer 10;
an upper housing 50 sealing the space between the air flow guide plate 40 and the exhaust box 24;
The winding 12 is composed of an inner low-voltage winding 12a and an outer high-voltage winding 12b centering on the iron core 14,
The lower housing 30 has a predetermined distance between the housing 20 and the mold transformer 10 and surrounds the front and rear and left and right sides of the mold transformer 10 while maintaining a predetermined distance from the bottom of the housing 20 It is installed so that it can be left and floated,
The air flow guide plate 40 is installed horizontally on the interface between the upper housing 50 and the lower housing 30 to increase the air flow resistance of the cooling air, so that the cooling air flows with the iron core 14 and Through the space between the low-pressure winding 12a, the space between the low-pressure winding 12a and the high-pressure winding 12b, and the space between the high-pressure winding 12b and the lower housing 30, the Mold transformer cooling device, characterized in that flowing into the upper housing. delete The method according to claim 1,
A mold transformer cooling device, characterized in that each of the safety doors (32) are installed on the front and rear sides of the lower housing (30) to block access to the charging part of the mold transformer (10). The method of claim 3,
The safety door (32) is a mold transformer cooling device, characterized in that the transparent window (34) is installed to facilitate the inspection of the mold transformer (10). The method of claim 4,
The safety door (32) is a mold transformer cooling device, characterized in that the double door type. The method according to claim 1,
The air flow guide plate (40) is a mold transformer cooling device, characterized in that located on the upper side of the outer periphery of the winding (12) of the mold transformer (10). delete The method according to claim 1,
At least one opening/closing door 24c is installed on one side or upper side of the exhaust box 24 to manually open and take emergency measures when a failure occurs in the exhaust system of the exhaust fan 24a and the exhaust duct 24b. Molded transformer cooling device, characterized.

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