A method for releasing the self-explosion pressure of an oil-immersed mutual inductor expander

Abstract

An oil-immersed transformer expander self-explosion pressure release method, characterized in that: in the oil-immersed transformer expander self-explosion pressure release method, when the pressure of the oil-immersed transformer suddenly increases, the self-explosion film expansion and self-explosion method is used to instantaneously release the transformer pressure through the pressure plate with a porous structure to protect the safety of the transformer body. In the way of combining the porous metal plate and the self-explosion film, the self-explosion film covering the holes automatically expands and ruptures when the transformer reaches the dangerous pressure, so that the transformer oil instantaneously sprays out through multiple pressure release holes to release the internal pressure of the transformer. The advantages of the present invention are: it can instantaneously release the suddenly increased pressure value; the designed self-explosion film is covered on the holes, in a fully sealed state under normal pressure, and when the dangerous pressure suddenly increases, the self-explosion film suddenly ruptures to achieve the purpose of pressure release. Based on the pressure release mechanism with a porous structure, it can effectively prevent the explosion accident caused by the sudden increase of the transformer pressure for a long time.

Description

Technical Field

[0001] The invention relates to the field of a self-explosion pressure release method for a high-voltage oil-immersed voltage / current transformer expander in electric power equipment, and in particular to a self-explosion pressure release method for an oil-immersed transformer expander. Background Art

[0002] At present, in the power system, the voltage / current transformer is a high-voltage device for measuring the primary voltage and current value. It is a very important electrical equipment in the substation. The national standard stipulates that the oil-immersed voltage / current transformer with a voltage level of 35kV and above must be equipped with an expander. The expander is at the top of the transformer and is connected to the insulating oil inside the transformer. The metal expander can adjust the change in the volume of the transformer body oil when the volume of the oil in the transformer changes due to temperature changes. The expander has been used in my country for many years and has played a huge role in protecting the transformer. However, when the transformer is due to improper manufacturing process, poor operation and maintenance, poor insulation material and other reasons, once the external porcelain sleeve of the high-voltage oil-immersed transformer fails internally, the internal insulating oil pressure will increase. When it increases to a certain level, it will cause an explosion, damage surrounding electrical equipment and threaten human safety. Nowadays, pressure relief valves are used in transformers to avoid the problem of transformer explosion caused by sudden pressure increase. When the pressure reaches a certain dangerous value, the pressure relief valve will be activated to release the pressure. Many problems have been found in this method. First, the pressure release speed is too slow. Due to the limitation of the pressure relief valve structure, a larger aperture cannot be made, and thus the internal pressure cannot be released quickly and in large quantities. Second, the pressure relief valve structure is a spring mechanism. If it does not work for a long time, it will cause jamming and other phenomena. It is easy for it to fail to work when an accident occurs, leading to serious accidents. Summary of the invention

[0003] The purpose of the present invention is to automatically rupture the self-explosion membrane when the pressure reaches a dangerous value, release the oil through multiple pressure release holes, relieve the internal pressure of the transformer, avoid the problem of unreliable pressure release valve, and ensure the pressure release action for a long time. A method for self-explosion pressure release of an oil-immersed transformer expander is provided.

[0004] The present invention provides a method for releasing the self-explosion pressure of an oil-immersed transformer expander, which is characterized in that: when the pressure of the oil-immersed transformer increases suddenly, the self-explosion membrane expands and explodes to instantly release the transformer pressure through a pressure plate with a porous structure, thereby protecting the transformer body.

[0005] The self-explosion module is composed of a pressure release metal plate and a self-explosion membrane. The self-explosion membrane covering the hole will automatically expand and rupture when the transformer reaches a dangerous pressure, so that the transformer oil will instantly spray out through multiple pressure release holes to release the internal pressure of the transformer.

[0006] The self - exploding film based on pure silicone rubber can withstand high temperature and corrosion for a long time and can work in the oil condition of the mutual inductor for a long time. Through tests and calculations, the self - explosion critical value under dangerous pressure is obtained, and a reasonable thickness and strength are designed so that when the mutual inductor reaches the dangerous pressure, the self - exploding film can effectively expand and self - explode to release the internal pressure of the mutual inductor.

[0007] An oil - filling valve 1 is installed at the center of the top of the expander 4. When the mutual inductor is short of oil or a newly manufactured mutual inductor, oil is filled through the oil - filling valve 1. The self - explosion module 2 is installed on the upper part of the expander 4, and two self - explosion modules 2 are installed by welding. The expander is installed on the metal plate at the bottom of the expander housing 3 and is connected by the expander connecting screw 6. The waterproof grade of the expander itself is IP55. When operating outdoors, the expander housing 3 needs to be installed, and the connection between the expander housing 3 and the mutual inductor is connected by the M8 expander housing screw 5;

[0008] The working process of the expander 4 is as follows: The oil in the mutual inductor passes through the communication hole 7 to connect the oil in the mutual inductor and the oil inside the expander 4. When the internal pressure of the mutual inductor is normal, the expander 4 is in a flat state; when the internal pressure of the mutual inductor increases, the expander 4 rises to expand the volume to maintain the pressure balance of the mutual inductor, and at this time the self - explosion module 2 does not act; when the pressure drops, the expander drops due to the elastic force, reducing the volume to maintain the pressure balance of the mutual inductor, and at this time the self - explosion module 2 does not act;

[0009] This invention is mainly applied in special situations. When the mutual inductor has an internal fault, resulting in a sudden increase in pressure, at this time the expander expands rapidly to the vertex. When the pressure reaches the dangerous value, the self - explosion film 11 of the self - explosion module 2 ruptures, the pressure release hole 8 releases the pressure, and the oil in the mutual inductor sprays out, quickly reducing the internal pressure of the mutual inductor to prevent the mutual inductor body from exploding.

[0010] According to Figure 2 As shown, the pressure - releasing metal plate is made of a circular stainless - steel plate. The stainless - steel plate is a 0.5 - mm - thick steel plate of model 304; 10 small holes are drilled on the steel plate. In order to release the suddenly increased pressure, the oil in the mutual inductor that is released sprays out through the small holes and flows into the entire expander housing 3. At this time, the operator will deal with it in time after discovery.

[0011] According to Figure 3 As shown, it consists of a pressure - releasing metal plate 10 and a self - explosion film 11. A self - explosion film 11 made of a silicone rubber film is pressed between two metal plates with the same size and position, and the pressure - releasing metal plate 10 is welded to the expander 4;

[0012] When the pressure of the mutual inductor is normal or changes slowly, the expander 4 is in a normal working state, and the entire self-exploding film 11 is sealed on the pressure release metal plate 10; when the mutual inductor has a sudden failure, the pressure of the expander 4 reaches a dangerous value. At this time, the self-exploding film 11 expands and ruptures, and the transformer oil sprays out through the pressure release hole 8, achieving the problem of alleviating the sudden increase in the internal pressure of the mutual inductor and preventing the explosion accident of the main body.

[0013] When a fault occurs inside the mutual inductor, the internal pressure increases instantaneously. The pressure is quickly released through the self-explosion device of the expander, avoiding the danger of the explosion of the main body of the mutual inductor. In particular, it relates to an expander installed in an oil-immersed mutual inductor that can automatically release pressure. The expander is connected to the internal insulating oil of the mutual inductor. When the pressure of the insulating oil slowly increases due to factors such as the external ambient temperature, the expander can expand and contract up and down to adjust the pressure.

[0014] Advantages of the present invention:

[0015] The self-explosion pressure release method of the expander of the oil-immersed mutual inductor of the present invention designs a self-explosion mechanism in the expander of the oil-immersed mutual inductor that can quickly release the internal pressure of the mutual inductor, and can instantaneously release the suddenly increased pressure value; it designs a pressure release hole with multiple holes, and uses the designed self-exploding film to cover the hole. In the normal pressure state, it is in a fully sealed state. When the suddenly increased dangerous pressure occurs, the self-exploding film suddenly ruptures to achieve the purpose of pressure release. In the past, the pressure release of the expander of the mutual inductor used the structure of a pressure release valve. This method has many problems in operation, such as spring jamming and valve body failure, which result in the inability to release pressure in case of danger. Based on the pressure release mechanism with a porous structure, it can effectively prevent the explosion accident caused by the sudden increase in the pressure of the mutual inductor for a long time. Brief Description of the Drawings

[0016] The following further describes the present invention in detail in conjunction with the drawings and embodiments:

[0017] Figure 1 It is a device diagram of the expander of the self-explosion method of the present invention;

[0018] Figure 2 It is a self-explosion module diagram on the expander of the present invention;

[0019] Figure 3 It is a schematic structural diagram of the self-explosion module of the present invention.

[0020] Figure 1 In it: filling oil valve 1, self-explosion module 2, expander outer cover 3, expander 4, expander housing screw 5, expander connection screw, communication hole 7;

[0021] Figure 2 In it: pressure release hole 8, pressure release plate 9;

[0022] Figure 3 In: Pressure relief metal plate 10, self - destruct film 11. Specific implementation manner

[0023] Example 1

[0024] The present invention provides a method for self - destruct pressure relief of an oil - immersed transformer expander, characterized in that: in the method for self - destruct pressure relief of the oil - immersed transformer expander, when the pressure of the oil - immersed transformer suddenly increases, the self - destruct film expands and self - destructs to instantaneously release the transformer pressure through the pressure plate with a porous structure, so as to protect the safety of the transformer body.

[0025] The self - destruct module is composed of a combination of a pressure relief metal plate and a self - destruct film. The self - destruct film covering the holes automatically expands and ruptures when the transformer reaches a dangerous pressure, so that the transformer oil instantaneously sprays out through a plurality of pressure relief holes to release the internal pressure of the transformer.

[0026] The self - destruct film based on pure silicone rubber can withstand high temperature and corrosion for a long time, can work under the oil quality conditions of the transformer for a long time. Through experiments and calculations, the self - destruct critical value under dangerous pressure is obtained, and a reasonable thickness and strength are designed so that the self - destruct film can effectively expand and self - destruct under the dangerous pressure of the transformer to release the internal pressure of the transformer.

[0027] An oil - filling valve 1 is installed at the center of the top of the expander 4. When the transformer is short of oil or a newly manufactured transformer, oil is filled through the oil - filling valve 1. The self - destruct module 2 is installed on the upper part of the expander 4, and two self - destruct modules 2 are installed by welding. The expander is installed on the metal plate at the bottom of the expander outer cover 3 and is connected by expander connection screws 6. The waterproof grade of the expander itself is IP55. When operating outdoors, the expander outer cover 3 needs to be installed. The connection between the expander outer cover 3 and the transformer is connected by M8 expander housing screws 5;

[0028] The working process of the expander 4 is as follows: the transformer oil passes through the communication hole 7 to connect the transformer oil and the oil inside the expander 4. When the internal pressure of the transformer is normal, the expander 4 is in a flat state; when the internal pressure of the transformer increases, the expander 4 rises and expands its volume to maintain the pressure balance of the transformer. At this time, the self - destruct module 2 does not act; when the pressure drops, the expander drops due to the elastic force, reducing the volume to maintain the pressure balance of the transformer. At this time, the self - destruct module 2 does not act;

[0029] The present invention is mainly applied in special cases. When the transformer has an internal fault and causes the pressure to suddenly increase, at this time, the expander expands rapidly to the apex. When the pressure reaches the dangerous value, the self - destruct film 11 of the self - destruct module 2 ruptures, the pressure relief hole 8 releases the pressure, and the transformer oil sprays out, quickly reducing the internal pressure of the transformer to prevent the transformer body from being damaged by explosion.

[0030] According toFigure 2 As shown, the pressure relief metal plate is made of a circular stainless steel plate, and the stainless steel plate is a 0.5 mm thick steel plate of model 304; there are 10 small holes drilled on the steel plate. In order to release the suddenly increased pressure, after the mutual inductor oil discharged flows out through the small holes, it flows into the entire expander housing 3. At this time, the operator will handle it in time after discovery.

[0031] According to Figure 3 As shown, it consists of a pressure relief metal plate 10 and a self-exploding film 11. A self-exploding film 11 made of a silicone rubber film is crimped between two metal plates with the same size and position. The pressure relief metal plate 10 is welded to the expander 4;

[0032] When the pressure of the mutual inductor is normal or changes slowly, the expander 4 is in a normal working state, and the entire self-exploding film 11 is sealed on the pressure relief metal plate 10; when the mutual inductor has a sudden failure and the pressure of the expander 4 reaches a dangerous value, at this time the self-exploding film 11 expands and ruptures, and the transformer oil sprays out through the pressure relief holes 8, achieving the problem of alleviating the sudden increase in the internal pressure of the mutual inductor and preventing the explosion accident of the main body.

[0033] When a fault occurs inside the mutual inductor, the internal pressure increases instantaneously, and the pressure is quickly released through the self-exploding device of the expander, avoiding the danger of the explosion of the mutual inductor main body. In particular, it relates to an expander installed in an oil-immersed mutual inductor that can automatically release pressure. The expander is connected to the internal insulating oil of the mutual inductor. When the pressure of the insulating oil slowly increases due to external environmental temperature and other factors, the expander can expand and contract up and down to adjust the pressure.

[0034] Embodiment 2

[0035] The present invention provides a method for self-exploding pressure relief of an oil-immersed mutual inductor expander, which is characterized in that: in the method for self-exploding pressure relief of the oil-immersed mutual inductor expander, when the pressure of the oil-immersed mutual inductor suddenly increases, the self-exploding film expansion and self-explosion method is used to instantaneously release the mutual inductor pressure through the pressure plate with a porous structure, achieving the safety of protecting the mutual inductor main body.

[0036] The self-exploding module is composed of a combination of a pressure relief metal plate and a self-exploding film. The self-exploding film covering the holes automatically expands and ruptures when the mutual inductor reaches a dangerous pressure, achieving the instantaneous spraying of the mutual inductor oil through multiple pressure relief holes and releasing the internal pressure of the mutual inductor.

[0037] The self-exploding film based on pure silicone rubber can withstand high temperature and corrosion for a long time, can work in the mutual inductor oil quality condition for a long time, obtains the self-explosion critical value under dangerous pressure through experiments and calculations, and designs a reasonable thickness and strength, so that when the mutual inductor reaches a dangerous pressure, the self-exploding film can effectively expand and self-explode to release the internal pressure of the mutual inductor.

[0038] The present invention is mainly applied in special situations. When the mutual inductor has an internal fault, resulting in a sudden increase in pressure, the expander expands rapidly to the vertex at this time. When the pressure reaches a dangerous value, the self - destruct module 2 causes the self - destruct film 11 to rupture, and the pressure release hole 8 releases the pressure, and the mutual inductor oil sprays out, quickly reducing the internal pressure of the mutual inductor to prevent the mutual inductor body from exploding.

[0039] According to Figure 2 As shown, the pressure release metal plate is made of a circular stainless - steel plate. The stainless - steel plate uses a 304 - type steel plate with a thickness of 0.5 mm. There are 10 small holes punched on the steel plate. In order to release the suddenly increased pressure, the mutual inductor oil that is released sprays out through the small holes and then flows into the entire expander outer cover 3. At this time, the operator will handle it in time after discovery.

[0040] According to Figure 3 As shown, it consists of a pressure release metal plate 10 and a self - destruct film 11. A self - destruct film 11 made of a silicone rubber film is pressed between two metal plates with the same size and position. The pressure release metal plate 10 is welded to the expander 4;

[0041] When the pressure of the mutual inductor is normal or changes slowly, the expander 4 is in a normal working state, and the entire self - destruct film 11 is sealed on the pressure release metal plate 10. When the mutual inductor has a sudden fault and the pressure of the expander 4 reaches a dangerous value, the self - destruct film 11 expands and ruptures at this time, and the transformer oil sprays out through the pressure release hole 8 to relieve the problem of sudden increase in the internal pressure of the mutual inductor and prevent the explosion accident of the main body.

[0042] When a fault occurs inside the mutual inductor, the internal pressure increases instantaneously. The pressure is quickly released through the self - destruct device of the expander, avoiding the danger of the mutual inductor body exploding. In particular, it relates to an expander installed in an oil - immersed mutual inductor that can automatically release pressure. The expander is connected to the internal insulating oil of the mutual inductor. When the pressure of the insulating oil slowly increases due to factors such as the external ambient temperature, the expander can expand and contract up and down to adjust the pressure.

[0043] Embodiment 3

[0044] The present invention provides a method for self - destruct pressure release of an oil - immersed mutual inductor expander, which is characterized in that: in the method for self - destruct pressure release of the oil - immersed mutual inductor expander, when the pressure of the oil - immersed mutual inductor suddenly increases, the self - destruct film expansion and self - destruct method is used to instantaneously release the mutual inductor pressure through the pressure plate with a porous structure to protect the safety of the mutual inductor body.

[0045] The self - destruct module is composed of a combination of a pressure release metal plate and a self - destruct film. The self - destruct film covering the hole automatically expands and ruptures when the mutual inductor reaches a dangerous pressure, enabling the mutual inductor oil to spray out instantaneously through multiple pressure release holes to release the internal pressure of the mutual inductor.

[0046] The self - exploding film based on pure silicone rubber can withstand high temperature and corrosion for a long time, and can work in the oil condition of the mutual inductor for a long time. Through tests and calculations, the self - explosion critical value under dangerous pressure is obtained, and reasonable thickness and strength are designed so that when the mutual inductor reaches the dangerous pressure, the self - exploding film can effectively expand and self - explode to release the internal pressure of the mutual inductor.

[0047] An oil - filling valve 1 is installed at the center of the top of the expander 4. When the mutual inductor is short of oil or a newly - manufactured mutual inductor, oil is filled through the oil - filling valve 1. The self - explosion module 2 is installed on the upper part of the expander 4, and two self - explosion modules 2 are installed by welding. The expander is installed on the metal plate at the bottom of the expander housing 3 and is connected by the expander connecting screw 6. The waterproof level of the expander itself is IP55. When operating outdoors, the expander housing 3 needs to be installed. The connection between the expander housing 3 and the mutual inductor is connected by the M8 expander housing screw 5;

[0048] The working process of the expander 4 is as follows: The oil in the mutual inductor passes through the communication hole 7 to make the oil in the mutual inductor and the oil inside the expander 4 communicate. When the internal pressure of the mutual inductor is normal, the expander 4 is in a flat state; when the internal pressure of the mutual inductor increases, the expander 4 rises to expand the volume to maintain the pressure balance of the mutual inductor. At this time, the self - explosion module 2 does not act; when the pressure drops, the expander drops due to the elastic force, reducing the volume to maintain the pressure balance of the mutual inductor. At this time, the self - explosion module 2 does not act;

[0049] This invention is mainly applied in special cases. When the mutual inductor has an internal fault, resulting in a sudden increase in pressure, at this time the expander expands rapidly to the vertex. When the pressure reaches the dangerous value, the self - exploding film 11 of the self - explosion module 2 ruptures, and the pressure release hole 8 releases the pressure, and the oil in the mutual inductor sprays out, quickly reducing the internal pressure of the mutual inductor to prevent the mutual inductor body from exploding.

[0050] When a fault occurs inside the mutual inductor, the internal pressure increases instantaneously, and the pressure is quickly released through the self - explosion device of the expander, avoiding the danger of the mutual inductor body exploding. In particular, it relates to an expander installed in an oil - immersed mutual inductor that can automatically release pressure. The expander is connected to the insulating oil inside the mutual inductor. When the pressure of the insulating oil slowly increases due to factors such as the external environmental temperature, the expander can expand and contract up and down to adjust the pressure.

Claims

1. An oil-immersed transformer expansion tank self-explosion pressure release method, characterized in that: In the oil-immersed transformer expansion tank self-explosion pressure release method, when the pressure of the oil-immersed transformer suddenly increases, the self-explosion film expansion and self-explosion method is used to instantaneously release the transformer pressure through the pressure plate with a porous structure, so as to protect the safety of the transformer body; the self-explosion module (2) is composed of a pressure release metal plate (10) and a self-explosion film (11) in combination. The self-explosion film (11) covering the hole automatically expands and ruptures when the transformer reaches the dangerous pressure, so that the transformer oil instantaneously sprays out through a plurality of pressure release holes, releasing the internal pressure of the transformer; the self-explosion film (11) based on pure silicone rubber can withstand high temperature and corrosion for a long time, and can work under the transformer oil quality conditions for a long time. Through tests and calculations, the self-explosion critical value under dangerous pressure is obtained, and the reasonable thickness and strength are designed so that the self-explosion film (11) can effectively expand and self-explode under the dangerous pressure of the transformer, releasing the internal pressure of the transformer; an oil filling valve (1) is installed at the center of the top of the expansion tank (4). When the transformer is low on oil or a newly manufactured transformer, oil is filled through the oil filling valve (1). The self-explosion module (2) is installed on the upper part of the expansion tank (4), and two self-explosion modules (2) are installed by welding. The expansion tank is installed on the metal plate at the bottom of the expansion tank outer cover (3) and is connected by an expansion tank connecting screw (6); the waterproof grade of the expansion tank itself is IP55. When operating outdoors, an expansion tank outer cover (3) needs to be installed. The connection between the expansion tank outer cover (3) and the transformer is connected by an M8 expansion tank housing screw (5); The working process of the expansion tank (4) is as follows: The transformer oil passes through the communication hole (7) to connect the transformer oil and the oil inside the expansion tank (4). When the internal pressure of the transformer is normal, the expansion tank (4) is in a flat state; when the internal pressure of the transformer increases, the expansion tank (4) rises and expands its volume to maintain the pressure balance of the transformer. At this time, the self-explosion module (2) does not act; when the pressure drops, the expansion tank drops due to the elastic force, reducing the volume and maintaining the pressure balance of the transformer. At this time, the self-explosion module (2) does not act; A self-explosion film (11) made of silicone rubber film is pressed between two pressure release metal plates (10) with the same size and position, and the pressure release metal plate (10) is welded to the expansion tank (4); when the transformer pressure is normal or changes slowly, the expansion tank (4) is in a normal working state, and the entire self-explosion film (11) is sealed on the pressure release metal plate (10); when the transformer has a sudden failure, the pressure of the expansion tank (4) reaches the dangerous value. At this time, the self-explosion film (11) expands and ruptures, and the transformer oil sprays out through the pressure release hole (8) to relieve the problem of sudden increase in the internal pressure of the transformer and prevent the explosion accident of the main body.

2. The oil-immersed transformer expansion tank self-explosion pressure release method according to claim 1, characterized in that: Due to an internal fault in the instrument transformer, the pressure suddenly increases. At this time, the expander expands rapidly to the apex. When the pressure reaches the dangerous value, the self-explosion module (2) causes the self-explosion film (11) to rupture, and the pressure release hole (8) releases the pressure. The transformer oil in the instrument transformer sprays out, quickly reducing the internal pressure of the instrument transformer and preventing the instrument transformer body from exploding.

3. The method for releasing the self-explosion pressure of the expander of the oil-immersed instrument transformer according to claim 1, characterized in that: The pressure release metal plate (10) is made of a circular stainless steel plate, and the stainless steel plate is a 304 model steel plate with a thickness of 0.5 mm. Ten small holes are drilled in the steel plate. In order to release the suddenly increased pressure, the transformer oil discharged through the small holes flows into the entire expander outer cover (3). At this time, the operator will handle it in time after discovery.

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