KR20220010998A - Pressure control apparatus of transformer - Google Patents

Abstract

The present invention provides a pressure control device for a transformer, which blocks contact with external air containing moisture and can automatically control inner pressure of a transformer, which varies according to the working condition of the transformer. The pressure control device for a transformer according to the present invention comprises: a support unit including a fixed plate joined to an insulating oil tank to have a first flow hole communicating with an inside of the insulated oil tank, a support plate disposed to be separated from the fixed plate to have a second flow hole, and a connection pipe disposed to connect the fixed plate and the support plate to have a pressure transfer flow path connecting the first flow hole and the second flow hole; a pressure control unit including a first flange joined to the support plate and a stretchable member joined to the first flange to be shrunk or stretched according to inner pressure of the insulated oil tank transferred through the second flow hole; and a protective cover including a second flange joined to the support plate and a cover body arranged to cover the pressure control unit. According to the present invention, contact with external air can be blocked and inner pressure in the insulated oil tank can be kept properly.

Description

PRESSURE CONTROL APPARATUS OF TRANSFORMER

The present invention relates to a pressure regulating device for a transformer, and more particularly, to a pressure regulating device for a transformer capable of automatically regulating the internal pressure of the transformer.

A transformer is a core device that supplies electricity to factories or residential complexes by changing the high voltage sent from the substation to a low voltage by the electromagnetic induction action of the iron core and windings. For this reason, it is installed on a power pole, etc. adjacent to a residential area, and is filled with insulating oil and an air layer is formed at the top.

Since these transformers are installed on utility poles, they are greatly affected by changes in temperature due to climate change. For example, a lot of load is applied during the summer or daytime when there is a lot of sunlight, and as the external temperature rises, the insulating oil in the transformer is affected by the temperature and the oil level rises, thereby increasing the pressure inside the transformer. In particular, if the external temperature rises close to 40 degrees in summer or a heavy transformer load is applied, heat generated from the windings and iron core of the transformer may be generated by over 75 degrees due to overload. .

Conversely, when the external temperature is lowered in winter or at night, the volume of the insulating oil is reduced by the influence of the temperature.

As such, when the internal temperature of the transformer rises or the internal pressure increases, the resistance increases and power loss occurs. When the internal pressure is reduced by releasing the internal air through the valve, contact with external air containing moisture This may cause a malfunction.

And, when the internal pressure of the transformer is reduced, there is a problem that weak parts such as bushings or gaskets may be cracked or damaged, and external air containing moisture may easily flow into the inside of the transformer through these damaged parts.

Accordingly, there is a need for a pressure regulating device capable of automatically regulating the internal pressure of the transformer, which varies according to the operating environment of the transformer, while blocking contact with external air containing moisture.

Republic of Korea Patent No. 0716895 (2007.05.10. Announcement)

An object of the present invention is to solve the problems of the prior art, and the present invention is the pressure of the transformer that can automatically adjust the internal pressure of the transformer, which varies according to the operating environment of the transformer, while blocking contact with external air containing moisture. To provide a control device.

In order to achieve the above object of the present invention, a pressure regulating device for a transformer according to an embodiment of the present invention includes a fixing plate coupled to an insulating oil tank and having a first flow hole communicating with the inside of the insulating oil tank, and the fixing plate a support part spaced apart from and having a support plate having a second flow hole, and a connection pipe disposed to connect the fixed plate and the support plate and having a pressure transmission passage connecting the first flow hole and the second flow hole; a pressure adjusting unit having a first flange coupled to the support plate, and an expansion and contraction member coupled to the first flange and contracted or expanded according to the internal pressure of the insulating oil tank transmitted through the second flow hole; and a protective cover having a second flange coupled to the support plate and a cover body provided to surround the pressure control unit, and blocks contact with external air while maintaining the internal pressure of the insulating oil tank in an appropriate state. It is characterized by being able to

In the pressure regulating apparatus for a transformer according to an embodiment of the present invention, the support part is disposed in the pressure transmission flow path so that the insulating oil of the insulating oil tank is blocked from flowing into the pressure transmission flow path through the first flow hole. and a cap for preventing backflow having one end coupled to the fixing plate to cover the first flow hole and having an air through hole disposed perpendicular to the first flow hole.

In the pressure regulating apparatus for a transformer according to an embodiment of the present invention, the support plate, the first flange, and the second flange may be sequentially stacked and disposed, wherein the support plate has a first exhaust groove on its periphery. And, the second flange is provided with a second exhaust groove portion corresponding to the first exhaust groove on the periphery, the first flange is provided with a deformable portion corresponding to the first exhaust groove portion and the second exhaust groove portion on the periphery, , when the internal pressure of the protective cover exceeds a preset reference pressure, the deformable portion is deformed by the excessive internal pressure to form an exhaust hole connecting the first exhaust groove and the second exhaust groove.

In the pressure regulating apparatus for a transformer according to an embodiment of the present invention, the deformable portion may be provided to have a thickness smaller than the thickness of the first flange by engraving a portion of the surface of the first flange.

In the pressure regulating device for a transformer according to an embodiment of the present invention, the protective cover may include a transparent window in a portion thereof so that the expansion and contraction state of the elastic member can be checked from the outside.

According to the present invention, it is possible to block a sudden change in pressure inside the insulating oil tank by automatically adjusting the internal pressure of the insulating oil tank through the pressure adjusting unit that contracts or expands according to the change in the internal pressure of the insulating oil tank, thereby extending the life of the transformer. and increase the transmission capacity.

According to the present invention, since it is possible to completely block the contact between the insulating oil tank and the outside air during the pressure control process, it is possible to further prevent deterioration of the insulating oil or shortening of the life of the transformer.

According to the present invention, it is possible to solve the environmental pollution problem caused by the leakage of insulating oil by blocking the external leakage of the insulating oil that jumps through the backflow prevention cap.

According to the present invention, when the internal pressure rises excessively and the elastic member or the coupling part is damaged, it is possible to prevent a safety accident such as a transformer or a pressure regulating device bursting by forcibly exhausting high-pressure air.

1 is a perspective view showing a pressure regulating device according to an embodiment of the present invention.
FIG. 2 is an exploded perspective view of FIG. 1 ;
3 is an exploded perspective view showing the pressure regulating device of FIG. 1 from another direction;
FIG. 4 is a cross-sectional view of FIG. 1 .
5 is an exploded perspective view illustrating the support of FIG. 1 .
6 is a perspective view illustrating a state in which the protective cover is removed in FIG. 1 .

Hereinafter, preferred embodiments of the present invention in which the above-described problems to be solved can be specifically realized will be described with reference to the accompanying drawings. In describing the present embodiments, the same names and reference numerals may be used for the same components, and an additional description thereof may be omitted.

1 is a perspective view showing a pressure control device according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of FIG. 1, FIG. 3 is an exploded perspective view showing the pressure control device of FIG. 1 from another direction, and FIG. It is a cross section of 1.

1 to 4, the pressure regulating device according to an embodiment of the present invention may be coupled to an insulating oil tank of a transformer (not shown).

The insulating oil tank may contain insulating oil at a lower portion and an air layer may be accommodated at an upper portion thereof. At this time, the pressure regulating device according to the present embodiment may be coupled to the upper portion of the insulating oil tank in which the air layer is disposed.

That is, when the insulating oil of the insulating oil tank is affected by the temperature and the oil level rises and the pressure inside the transformer increases, the pressure regulator can reduce the pressure inside the insulating oil tank while accommodating the air of the insulating oil tank inside.

And, when the volume of the insulating oil in the insulating oil tank is reduced under the influence of temperature and the pressure inside the transformer is reduced, the pressure regulator increases the pressure inside the insulating oil tank while supplying the air contained therein to the insulating oil tank again. can

As a result, the pressure regulating device according to the present embodiment may automatically adjust the internal pressure of the transformer to an appropriate pressure state.

Specifically, the pressure regulating device according to the present embodiment may include a support part 100 , a pressure regulating part 200 , and a protective cover 300 .

The support part 100 may be installed to connect the pressure control part 200 and the insulating oil tank, and may include a fixing plate 110 , a support plate 120 , and a connection pipe 130 .

The fixing plate 110 may be provided in a plate shape, and may be coupled to the insulating oil tank using fasteners passing through the plurality of fastening holes H1.

In addition, the fixing plate 110 may include a first flow hole 111 , and the first flow hole 111 may be formed through the center of the fixing plate 110 . The first flow hole 111 may communicate with the internal space of the insulating oil tank, and air inside the insulating oil tank may be introduced.

The support plate 120 may be provided in a plate shape, and may be disposed to be spaced apart from the fixed plate 110 . The support plate 120 may be installed and supported by the pressure adjusting unit 200 and the protective cover 300 . The pressure adjusting unit 200 and the protective cover 300 may be fixedly coupled through the fastening hole H2 formed along the circumference.

In addition, the support plate 120 may include a second flow hole 121 , and the second flow hole 121 may be formed through the center of the support plate 120 to coincide with the first flow hole 111 . . The second flow hole 121 may communicate with the internal space of the pressure adjusting unit 200 .

The connection pipe 130 may be provided to connect the fixed plate 110 and the support plate 120 , and therein a pressure transmission passage 131 connecting the first flow hole 111 and the second flow hole 121 is provided. can be provided.

Accordingly, the air inside the insulating oil tank may be introduced into the pressure control unit 200 through the first flow hole 111 , the pressure transmission flow path 131 , and the second flow hole 121 , and the pressure control unit 200 . The internal air may be introduced into the insulating oil tank through the second flow hole 121 , the pressure transmission passage 131 , and the first flow hole 111 .

The pressure control unit 200 is coupled to the support unit 100, and can properly maintain the pressure inside the insulating oil tank while contracting or extending according to the internal pressure of the insulating oil tank, and the first flange 210 and the expansion and contraction member 220. may include

The first flange 210 may be provided in a ring shape, may be laminated on the upper surface of the support plate 120 , and may be laminated on the upper surface of the support plate 120 and then formed along the periphery of the support plate with a fastening hole H3 . It may be coupled using a fastener in a state in which it matches the fastening hole H2 of 120 .

The telescoping member 220 may have one end coupled to the first flange 210 , and may be provided in a closed box shape except for an opening on one side facing the first flange 210 .

As the internal pressure of the insulating oil tank increases, the stretchable member 220 may extend while accommodating the air introduced from the second flow hole 121 therein.

And, as the internal pressure of the insulating oil tank decreases, the stretchable member 220 may be contracted while the air received therein is supplied back to the insulating oil tank through the second flow hole 121 .

As the elastic member 220, a corrugated pipe (Bellows) may be used, or a bag made of a flexible material, such as a balloon, may be used.

Also, the first flange 210 may be made of the same material as the elastic member 220 , and may be integrally formed when the elastic member 220 is manufactured.

The protective cover 300 is coupled to the support part 100 , and may protect the pressure adjusting part 200 from the outside, and may include a second flange 310 and a cover body 320 .

The second flange 310 may be provided in a ring shape, may be laminated on the upper surface of the first flange 210, and may be laminated on the upper surface of the first flange 210 and then formed along the periphery of the fastening hole ( H4) may be coupled using a fastener while matching the fastening hole H3 of the first flange 210 .

One end of the cover body 320 may be coupled to the second flange 310 , and may be provided in a closed box shape except for an opening on one side facing the first flange 210 .

The cover body 320 may be made of a synthetic resin or a metal material, and may be disposed to completely surround the stretchable member 220 . Accordingly, the stretchable member 220 may be maximally extended by the volume of the internal space of the cover body 320 .

In addition, when the coupling part between the support part 100 , the pressure control part 200 and the protective cover 300 is cracked or the elastic member 220 is torn, the air lost through this damaged part is the cover body 320 . It is accommodated in the interior, and contact with the outside air may be blocked.

Although not shown, the protective cover 300 may further include a pressure gauge and a notification means. By measuring the internal pressure of the protective cover 300 through a pressure gauge, it is possible to immediately detect whether the coupling part or the elastic member 220 is damaged. In addition, the notification means may send a notification to a user or a manager around the area based on the pressure measured through the pressure gauge, so that a quick maintenance can be performed for damage to the coupling part or the elastic member 220 .

In addition, the cover body 320 may be provided with a transparent window 330 (refer to FIG. 1) in a portion so that the expansion and contraction state of the elastic member 220 can be checked from the outside. Through the transparent window 330 through the expansion and contraction state of the elastic member 220, it is possible to easily estimate the current pressure state inside the insulating oil tank.

In addition, the pressure regulating device according to this embodiment sequentially couples the support part 100 , the pressure regulating part 200 and the protective cover 300 to the insulating oil tank. As shown in FIG. 4 , the cover body 320 of An extension portion extending downwardly to surround the second flange 310 as well as the first flange 210 and the support plate 120 may be provided at the lower end.

By allowing the cover body 320 to completely surround the support plate 120 , the first flange 210 and the second flange 310 through the extension, the support plate 120 , the first flange 210 and the second flange 310 . ) can minimize the inflow of external air through the coupling part, and the rigidity of the coupling part can be increased.

5 is an exploded perspective view illustrating the support of FIG. 1 .

Referring additionally to FIG. 5 , the support part 100 according to the present embodiment may further include a backflow prevention cap 140 .

The backflow prevention cap 140 may be installed in the pressure transmission flow path 131 of the connection pipe 130 , and may be provided in a box shape with one side open. In addition, one side opened to cover the first flow hole 111 may be coupled to the fixing plate 110 . In this case, the backflow prevention cap 140 may be provided with an air through hole 141 disposed perpendicular to the first flow hole 111 .

Accordingly, the air introduced into the interior through the first flow hole 111 may flow to the second flow hole 121 through the pressure transmission passage 131 through the air through hole 141 and upward by an external force. When the jumping insulating oil flows into the first flow hole 111 side, the supply to the pressure transmission flow path 131 side by the backflow prevention cap 140 may be minimized or blocked.

6 is a perspective view illustrating a state in which the protective cover is removed in FIG. 1 .

Referring additionally to Figure 6, the pressure regulating device according to the present embodiment, when the pressure inside the insulating oil tank rises excessively and the elastic member 220 is damaged, such as torn, by forcibly exhausting air to the outside, A means for preventing safety accidents such as a transformer or a pressure regulating device bursting may be further provided.

According to the embodiment, when the coupling portion is cracked or the elastic member 220 is torn so that the internal pressure of the cover body 320 exceeds a preset reference pressure, the support plate 120 and the first flange 210 are stacked. , it is possible to forcibly exhaust the internal pressure to the outside through a partial region of the coupling portion of the second flange 310 .

Specifically, the support plate 120 may include a first exhaust groove portion 123 along the circumference.

In addition, the second flange 310 may include a second exhaust groove portion 313 at a position corresponding to the first exhaust groove portion 123 along the circumference.

In addition, the first flange 210 may include a deformable portion 213 at a position corresponding to the first exhaust groove portion 123 and the second exhaust groove portion 313 along the circumference.

When the internal pressure of the cover body 320 exceeds the reference pressure, the deformable part 213 may be deformed and damaged before other parts including the cover body 320, and accordingly, the first exhaust groove part 123. and an exhaust hole S connecting the second exhaust groove 313 may be formed.

Therefore, when the coupling part is cracked or the elastic member 220 is torn so that the internal pressure of the cover body 320 exceeds a preset reference pressure, the transformer or the cover body 320 explodes before the accident occurs, the exhaust hole ( Through S), the high pressure of the transformer can be exhausted to the outside.

The deformable part 213 according to the embodiment may be manufactured integrally with the first flange 210 . In this case, the deformable part 213 may be made of the same material as the first flange 210 and the elastic member 220 . may be

And, when the deformable portion 213 is manufactured integrally with the first flange 210 , the deformable portion 213 may have a thickness t1 that is smaller than the thickness t2 of the first flange 210 , for example For example, the deformable part 213 may be formed by machining the surface of the first flange 210 corresponding to the first exhaust groove part 123 and the second exhaust groove part 313 by engraving (214: see FIG. 2). have.

In addition, the deformable portion 213 may be manufactured separately from the first flange 210 and then coupled to the first flange 210 . In this case, the deformable portion 213 is made of a softer material than the first flange 210 . may be done

In addition, a notch may be formed in the coupling portion between the deformable portion 213 and the first flange 210 , and by forming the notch, the deformable portion 213 is temporarily separated from the first flange 210 and the exhaust hole ( S) can be formed quickly.

As described above, the pressure regulating device according to the present invention automatically adjusts the internal pressure of the insulating oil tank through the pressure adjusting unit 200 that contracts or expands according to the change in the internal pressure of the insulating oil tank, thereby rapidly changing the pressure inside the insulating oil tank. can be cut off, thereby extending the life of the transformer and increasing the transmission capability.

And, since the pressure regulating device according to the present invention can completely block the contact between the insulating oil tank and the external air during the pressure control process, it is possible to further prevent deterioration of the insulating oil or shortening of the life of the transformer.

In addition, the pressure regulating device according to the present invention can solve the environmental pollution problem caused by the leakage of insulating oil by blocking the external leakage of insulating oil that jumps through the cap 140 for preventing backflow.

In addition, the pressure regulating device according to the present invention prevents a safety accident such as exploding of a transformer or a pressure regulating device by forcibly exhausting high-pressure air when the internal pressure rises excessively and damage occurs in the elastic member 220 or the coupling portion. It can be prevented.

Although the preferred embodiment of the present invention has been described with reference to the drawings as described above, those skilled in the art may vary the present invention in various ways without departing from the spirit and scope of the present invention as set forth in the claims below. may be modified or changed.

100: support 110: fixed plate
120: support plate 130: connector
140: backflow prevention cap 200: pressure control unit
210: first flange 220: elastic member
300: protective cover 310: second flange
320: cover body

Claims (5)

A fixing plate coupled to the insulating oil tank and having a first flow hole communicating with the inside of the insulating oil tank, a support plate spaced apart from the fixing plate and having a second flow hole, and the fixing plate and the support plate are arranged to connect the first a support part having a connection pipe having a flow hole and a pressure transmission passage connecting the second flow hole;
a pressure adjusting unit having a first flange coupled to the support plate, and an expansion and contraction member coupled to the first flange and contracted or expanded according to the internal pressure of the insulating oil tank transmitted through the second flow hole; and
Includes; a second flange coupled to the support plate, and a protective cover having a cover body provided to surround the pressure control unit;
A pressure regulating device for a transformer, characterized in that it is possible to keep the internal pressure of the insulating oil tank in an appropriate state while blocking contact with external air. According to claim 1,
The support part,
The insulating oil of the insulating oil tank is disposed in the pressure transmission path to block the inflow into the pressure transmission path through the first flow hole, and one end is coupled to the fixing plate so as to cover the first flow hole, 1 A pressure regulating device for transformer, characterized in that it further comprises; According to claim 1,
The support plate, the first flange and the second flange are sequentially stacked and disposed,
The support plate is provided with a first exhaust groove on the circumference,
The second flange has a second exhaust groove portion corresponding to the first exhaust groove portion on the periphery,
The first flange is provided with a deformable portion corresponding to the first exhaust groove portion and the second exhaust groove portion on the periphery,
When the internal pressure of the protective cover exceeds a preset reference pressure, the deformable portion is deformed by the excessive internal pressure to form an exhaust hole connecting the first exhaust groove and the second exhaust groove Transformer pressure regulator. 4. The method of claim 3,
The deformation part is a pressure control device of a transformer, characterized in that provided to have a thickness smaller than the thickness of the first flange by engraving a portion of the surface of the first flange. According to claim 1,
The protective cover,
A pressure regulating device for a transformer, characterized in that a transparent window is provided in a portion so that the expansion and contraction state of the elastic member can be checked from the outside.

Images