Oil-immersed transformer with oil leakage reminding structure

Abstract

This invention discloses an oil-immersed transformer with an oil leakage warning structure, including an oil tank, an oil conservator, and a connecting pipe for bidirectional oil flow between the oil tank and the oil conservator. The oil conservator has an oil storage chamber and a bladder bag inside, and the bladder bag expands and contracts through a first delivery pipe, a second delivery pipe, and a breather. In this invention, a separation cylinder is set between the first and second delivery pipes. The separation cylinder has a three-stage oil-gas separation structure inside, so that before the oil and gas enter the breather, the oil droplets in the airflow are separated by the three-stage oil-gas separation structure, and the separated oil droplets are collected in the oil collection chamber at the bottom of the separation cylinder. The photoelectric oil sensor located in the oil collection chamber detects the oil level, and together with the airflow velocity sensor installed on the second delivery pipe, it can provide timely warnings for hidden oil leaks that are not visible from the outside and where the oil level is still normal.

Description

Technical Field

[0001] This invention relates to the field of transformer technology, specifically to an oil-immersed transformer with an oil leakage warning structure. Background Technology

[0002] Oil-immersed transformers are core equipment in power systems for power transmission and voltage transformation. The oil conservator, as an important auxiliary component of oil-immersed transformers, functions primarily to compensate for the volume expansion or contraction of transformer oil caused by temperature changes. Simultaneously, through internal bladder-like structures, it isolates the transformer oil from air, reducing direct contact between oil and air, delaying oil aging, and ensuring the insulation performance and service life of the transformer's insulating oil.

[0003] However, when the bladder bag ruptures, the transformer oil inside the oil conservator comes into direct contact with air. Oil vapors from the conservator can then enter the breather through the connecting pipe between the conservator and the breather. Simultaneously, the pressure imbalance inside the conservator caused by the ruptured bladder bag leads to a large influx of air into the breather, further exacerbating the influx of oil vapors. The oil vapors entering the breather contain numerous oil droplets, which contaminate the breather, preventing the internal filtration structure from effectively absorbing moisture. This allows humid air to penetrate the conservator, accelerating the deterioration of the insulating oil. Furthermore, the ruptured bladder bag creates a false oil level reading, making it impossible for the oil level gauge inside the conservator to promptly detect leaks. This disrupts the stability of the internal environment of the conservator, ultimately affecting the safety of the transformer's internal components.

[0004] Patent application CN115541147A discloses an oil-immersed transformer oil leakage detection device, which uses a drive mechanism, a sealing mechanism and a trigger-type air supply mechanism to drive the transformer oil tank to perform air-filling detection, thereby checking whether the oil tank body has oil leakage; however, the above patent only applies to the oil tank, and cannot detect oil leakage in components such as the oil conservator adapted to the oil tank and the capsule bag located inside the oil conservator. Summary of the Invention

[0005] The purpose of this invention is to provide an oil-immersed transformer with an oil leakage warning structure, which solves the problem in the prior art that it is impossible to promptly warn of hidden oil leakage situations such as damage to the bladder bag inside the oil conservator or oil ingress into the breather, which are not visible from the outside and where the oil level is still displayed as normal.

[0006] The objective of this invention can be achieved through the following technical solutions: An oil-immersed transformer with an oil leakage warning structure includes an oil tank, an oil conservator, and a connecting pipe for bidirectional flow of oil between the oil tank and the oil conservator; the oil conservator is provided with an oil storage chamber and a capsule bag inside, and a breathing assembly is installed on one side of the oil conservator. The breathing assembly includes a first delivery pipe, one end of which is sealed to the opening of the capsule bag, and the other end of which is connected to a breather through a second delivery pipe. A separation mechanism is provided between the first delivery pipe and the second delivery pipe. The separation mechanism includes a separation cylinder with both ends connected to one end of the first delivery pipe and one end of the second delivery pipe, respectively. The interior of the separation cylinder is divided into a first cavity, a second cavity, and an oil collecting cavity from top to bottom. Multiple first oil baffles are arranged alternately in the first cavity, and multiple second oil baffles are arranged alternately in the second cavity. A photoelectric oil sensor is fixedly installed on the outer wall of the separation cylinder near the oil collecting cavity by a support. Its probe is inserted into the oil collecting cavity, and the end of the probe is located above the bottom of the oil collecting cavity.

[0007] Preferably, an airflow velocity sensor is installed on the outer wall of the second delivery pipe via a fixed support, and the probe of the airflow velocity sensor extends into the interior of the second delivery pipe to fully contact the airflow inside the pipe.

[0008] Preferably, a frame is fixedly installed at the connection between the cavity and the second cavity, and multiple filter elements are evenly arranged inside the frame. The filter elements have a hexagonal cross-section, and the upper and lower ends of the filter elements are respectively connected to the interior of the first cavity and the second cavity. After the airflow is separated in the first cavity, it is further filtered by the filter element, and then separated again in the second cavity.

[0009] Preferably, the plurality of first oil baffles and second oil baffles are all in an inclined state, and the inclined bottom points of the plurality of first oil baffles and second oil baffles are close to the oil collecting chamber; an oil drain pipe is fixedly connected to the bottom of the oil collecting chamber, and the oil drain pipe is used to drain the oil collected in the oil collecting chamber.

[0010] Preferably, the surfaces of the plurality of first oil baffles and second oil baffles are coated with an oleophilic coating, and the top surfaces of the plurality of first oil baffles and second oil baffles are provided with oil guide grooves to guide the oil adhering to the surfaces of the first oil baffles and second oil baffles to flow into the oil collection chamber.

[0011] Preferably, the separator has a first opening at one end near the first cavity and a second opening at the side near the second cavity, with the second opening located above the oil collecting cavity; both the first and second openings have trapezoidal cross-sections.

[0012] Preferably, a first pipeline is provided at the end of the first opening and the first delivery pipe away from the oil reservoir, and a second pipeline is provided at the end of the second opening and the second delivery pipe away from the respirator.

[0013] Preferably, the first pipeline includes a first tee pipe fixed at the end of the first delivery pipe away from the oil tank. The other two ports of the first tee pipe face the separation cylinder, and each port is provided with a first valve for independently controlling the opening and closing of each pipeline of the first tee pipe. Both ends of the first tee pipe are fixedly connected to sealing flanges, and the ends of the two separation cylinders near the first opening are also fixedly connected to matching sealing flanges. A first screw is rotatably connected between two adjacent sealing flanges.

[0014] Preferably, the second pipeline includes a second three-way pipe fixed at the end of the second delivery pipe away from the respirator. The other two ports of the second three-way pipe face the separation cylinder, and each port is provided with a second valve for independently controlling the opening and closing of each pipeline of the second three-way pipe. Both ends of the second three-way pipe are fixedly connected to sealing flanges, and the ends of the two separation cylinders near the second opening are also fixedly connected to matching sealing flanges. A second screw is rotatably connected between two adjacent sealing flanges.

[0015] Preferably, a support plate is fixedly connected to the outer wall of one end of the second delivery tube near the respirator, and the other end of the support plate is fixedly connected to one side of the top support of the fuel tank.

[0016] The beneficial effects of this invention are: 1. In this invention, a separation cylinder is set between the first and second delivery pipes. The separation cylinder has a three-stage oil-gas separation structure inside. Before entering the respirator, the oil and gas will first pass through the three-stage oil-gas separation structure to separate oil droplets in the airflow. The separated oil droplets are concentrated in the oil collection chamber at the bottom of the separation cylinder. The photoelectric oil sensor located in the oil collection chamber can detect the oil and provide timely reminders for hidden oil leaks that are not visible from the outside and whose oil level is still normal. At the same time, the airflow that has completed the oil droplet separation enters the respirator to reduce the contamination of the respirator by the oil.

[0017] 2. In this invention, an airflow velocity sensor is installed in the second delivery pipe connected to the respirator, so that the airflow velocity in the first delivery pipe, the second delivery pipe and the respirator can be detected in real time. Combined with the judgment of the photoelectric oil sensor, multiple means of reminders can be realized so as to effectively judge whether there is oil leakage inside the oil tank.

[0018] 3. In this invention, a three-way pipe is provided at one end of the first and second conveying pipes near the separating cylinder, so that multiple separating cylinders can be connected in parallel between the first and second conveying pipes. When a single separating cylinder fails, another separating cylinder can be switched in time to ensure the unobstructed breathing path between the first and second conveying pipes and the respirator, meet the normal expansion and contraction of the capsule bag, and ensure the safe use of the transformer. Attached Figure Description

[0019] The invention will now be further described with reference to the accompanying drawings.

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the fuel tank in this invention; Figure 3 This is a schematic diagram of the internal structure of the oil conservator in this invention; Figure 4 This is an exploded view of the structure of the first conveying pipe, the second conveying pipe, and the separation cylinder in this invention; Figure 5 This is a schematic diagram of the connection structure between the second delivery tube and the respirator in this invention; Figure 6 This is a cross-sectional view of the internal structure of the separation cylinder in this invention; Figure 7 This is a front view of the internal structure of the separator cylinder in this invention.

[0021] In the diagram: 1. Oil tank; 2. Oil conservator; 3. Oil storage chamber; 31. Gas relay; 4. Capsule bag; 5. Breathing assembly; 51. First delivery pipe; 52. Second delivery pipe; 53. Breather; 54. Support; 6. Separation mechanism; 61. Separation cylinder; 62. First cavity; 621. First baffle plate; 63. Second cavity; 631. Second baffle plate; 64. Oil collection chamber; 65. Oil drain pipe; 66. Photoelectric oil sensor; 67. Frame; 671. Filter element; 68. First opening; 69. Second opening; 7. Airflow velocity sensor; 8. First tee pipe; 81. First valve; 82. First screw; 9. Second tee pipe; 91. Second valve; 92. Second screw. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] See Figures 1 to 7 As shown, an oil-immersed transformer with an oil leakage warning structure includes an oil tank 1, an iron core is placed inside the oil tank 1, and insulating oil (hereinafter referred to as oil) is injected into the oil tank 1. The oil tank 1 is equipped with heat dissipation fins for heat dissipation. The heat dissipation fins are tightly attached to the outer wall of the oil tank 1 to ensure efficient heat conduction and dissipation of the oil, and to avoid affecting the operating stability of the transformer due to excessive oil temperature. See Figure 1 and Figure 3 As shown, to provide sufficient space for thermal expansion and contraction of the oil inside the oil tank 1 and prevent oil overflow or negative pressure due to temperature changes, an oil conservator 2 is mounted on one side of the oil tank 1 via a bracket 54. The oil conservator 2 is made of stainless steel and is cylindrical in shape. It has a sealed oil storage chamber 3 inside, which is connected to the inside of the oil tank 1 via a connecting pipe, enabling bidirectional oil flow. A gas relay 31 is fixedly installed on the connecting pipe. Its working principle is as follows: When a fault such as inter-turn short circuit, partial discharge, or core overheating occurs in the oil tank 1, the surrounding oil will be instantly decomposed to generate a large amount of gas. The gas enters the gas relay 31 from inside the oil tank 1 through the connecting pipe and is then discharged into the air through the oil conservator 2. When the fault is minor, the gas slowly accumulates, and the gas relay 31 issues an alarm signal to remind staff to investigate promptly. When the fault is severe enough to potentially damage equipment or endanger the safe operation of the power grid, the gas relay 31 will automatically trigger a tripping mechanism, cutting off the transformer power supply and forcibly stopping operation, fundamentally ensuring the safety of the transformer and surrounding equipment.

[0024] See Figure 3 As shown, a sealed capsule bag 4 is installed inside the oil conservator 2. The capsule bag 4 is made of oil-resistant and aging-resistant nitrile rubber. It is located above the oil storage chamber 3, and the bottom of the capsule bag 4 is in close contact with the oil surface to isolate the oil from the air. When the oil expands and contracts with temperature changes, the capsule bag 4 expands or contracts synchronously. When it expands, it squeezes out the internal air, and when it contracts, it draws in the external air. Throughout the process, it ensures that the oil inside the oil conservator 2 does not come into direct contact with the air, effectively preventing the oil from oxidizing, deteriorating, or getting damp, thus extending the service life of the oil and avoiding losses caused by oil evaporation.

[0025] See Figure 1 and Figure 3 As shown, a breathing assembly 5 is installed on one side of the oil reservoir 2. The capsule bag 4 expands and contracts through this breathing assembly 5 to ensure pressure balance inside the oil reservoir 2. The breathing assembly 5 includes a first delivery pipe 51, one end of which is sealed to the opening of the capsule bag 4; the other end of the first delivery pipe 51 is connected to a respirator 53 through a second delivery pipe 52. The respirator 53 is a silica gel desiccant respirator 53, which can filter the air entering the capsule bag 4, remove moisture and impurities from the air, and further protect the oil and the capsule bag 4; a support plate is fixedly connected to the outer wall of the respirator 53, and the other end of the support plate is fixedly installed on the top of the oil tank 1 to ensure that the respirator 53 is securely installed.

[0026] See Figure 3 and Figure 5As shown, an airflow velocity sensor 7 (model FS-3000) is installed on the outer wall of the second delivery pipe 52 via a fixed support. Its probe extends into the interior of the second delivery pipe 52, making full contact with the airflow inside the pipe. It is used to monitor the flow rate, flow volume, and fluctuation pattern of the airflow in the breathing assembly 5 in real time, providing data support for judging the operating status of the capsule bag 4. The specific judgment logic is as follows: When the capsule bag 4 is operating normally, the breathing airflow velocity of the respirator 53 is stable, and the fluctuation range is controlled within ±5%. When the capsule bag 4 is damaged or the seal fails, its internal air chamber seal is broken, and the oil inside the oil pillow 2 will enter the air chamber, causing the air chamber volume to shrink abnormally. The breathing airflow channel is blocked and the pressure is unbalanced. At this time, the airflow velocity in the first delivery pipe 51 and the second delivery pipe 52 connected to the respirator 53 will increase instantaneously and remain in a high state (more than 30% higher than the normal flow rate), and will not drop quickly. The airflow velocity sensor 7 can capture this abnormal signal and promptly feed it back to the control terminal.

[0027] See Figures 3 to 7 As shown, to promptly alert staff to oil leaks within the oil reservoir 2, a separation mechanism 6 is installed between the first delivery pipe 51 and the second delivery pipe 52. This separation mechanism 6 effectively separates oil droplets carried in the breathing airflow and simultaneously collects and monitors the leaked oil. The inner walls of all components of the separation mechanism 6 are coated with an oleophilic coating. The separation mechanism 6 includes a separation cylinder 61, which is made of seamless steel pipe. Its interior is divided from top to bottom into a first chamber 62, a second chamber 63, and an oil collection chamber 64. An oil drain pipe 65 is fixedly connected to the bottom of the oil collection chamber 64. A control valve (a standard model capable of opening and closing the drain pipe 65 to discharge the oil from the oil collection chamber 64) is installed on the oil drain pipe 65 to periodically discharge the oil collected in the oil collection chamber 64. The valve employs a corrosion-resistant sealing structure to prevent oil leakage.

[0028] The first cavity 62 is a coarse separation cavity, inside which are fixed multiple first oil baffles 621. The multiple first oil baffles 621 are evenly arranged in a staggered manner to form an S-shaped airflow channel, which can force the airflow to change its flow direction. Moreover, the multiple first oil baffles 621 are all in an inclined state (inclination angle of 30°-45°), which facilitates the sliding of oil droplets. In the horizontal direction, the width of the flow channel between two adjacent first oil baffles 621 is set to 15-20mm, and in the vertical direction, the height of the flow channel between two adjacent first oil baffles 621 is set to 25-30mm. This size design allows for a larger cross-sectional area of ​​the flow channel, effectively reducing the airflow velocity, allowing large-diameter oil droplets entrained in the airflow to settle rapidly under the action of gravity and inertia, impacting the surface of the first oil baffles 621, and then sliding down along the oil guide grooves opened on the surface of the inclined first oil baffles 621 to the oil collection cavity 64.

[0029] The second cavity 63 is a fine separation cavity, with multiple second oil baffles 631 fixed inside. The multiple second oil baffles 631 are also arranged in an alternating manner and are inclined (the inclination angle is the same as that of the first oil baffle 621). Compared with the first cavity 62, the flow channel size here is optimized and reduced: the flow channel width between two adjacent second oil baffles 631 is reduced to 6-10mm, the flow channel height is reduced to 15-20mm, and the flow channel cross-sectional area is reduced, which increases the airflow velocity and allows the tiny oil mist particles carried in the airflow to gain sufficient inertia and effectively collide with the second oil baffles 631. The oil mist adheres to the surface of the oil baffle and gathers into oil droplets, which then slide down into the oil collection cavity 64 along the oil guide groove opened on the top surface of the inclined second oil baffle 631.

[0030] See Figures 6 to 7 As shown, a frame 67 is fixedly installed at the connection between the first cavity 62 and the second cavity 63. Multiple filter elements 671 are evenly arranged inside the frame 67. The filter elements 671 are made of glass fiber and have a hexagonal cross-section, which can increase the filtration area and improve the separation effect. The filter elements 671 are in an inclined hollow state (the inclination angle is 20°-30°). The upper and lower ends of the filter elements 671 are connected to the interior of the first cavity 62 and the second cavity 63, respectively. After the airflow is separated by the first cavity 62, it is further filtered by the filter elements 671 to remove residual small oil mist particles and ensure that the airflow entering the breathing assembly 5 is clean. At the same time, the filter elements 671 can intercept some oil droplets and guide them to slide down to the oil collection chamber 64.

[0031] See Figure 7 As shown, a photoelectric oil sensor 66 (model HL-OT200) is fixedly installed on the outer wall of the separator 61 near the oil collecting chamber 64 via a support. Its probe is inserted into the oil collecting chamber 64, with the probe tip located 10-15mm above the bottom of the chamber, in the central area where oil tends to accumulate. The photoelectric oil sensor 66 is staggered from the valve at the drain pipe 65, ensuring that the probe is submerged when the oil level in the collecting chamber 64 reaches a certain height, enabling reliable oil level detection, while also not obstructing the discharge of accumulated oil through the drain pipe 65. Simultaneously, the connection between the probe and the separator 61 employs a sealed structure (double seal with sealing ring and sealant) to ensure airtightness and prevent false alarms caused by air leakage or dust ingress. When the oil level in the collecting chamber 64 reaches a set threshold, the photoelectric oil sensor 66 issues a leak warning signal, promptly notifying personnel for handling.

[0032] See Figure 4 and Figure 7As shown, the separator 61 has a first opening 68 at one end near the first chamber 62 and a second opening 69 at the side near the second chamber 63. The second opening 69 is located above the oil collecting chamber 64 to prevent the oil in the oil collecting chamber 64 from flowing back into the second chamber 63. The first opening 68 and the second opening 69 have trapezoidal cross-sections to facilitate the smooth flow of air into and out of the separator 61. The first opening 68 is connected to the end of the first delivery pipe 51 away from the oil reservoir 2 through a first pipe, and the second opening 69 is connected to the end of the second delivery pipe 52 away from the breather 53 through a second pipe. The connections are sealed with sealing flanges to ensure that the air path is unobstructed and leak-free.

[0033] See Figure 4 As shown, to address the problem that a failure of a single separator 61 could obstruct the breathing path of the breathing assembly 5, thereby affecting the normal expansion and contraction of the capsule bag 4 and endangering transformer safety, a connection structure is provided between the first conveying pipe 51 and the second conveying pipe 52. That is, the two separators 61 are connected in parallel through the first pipe and the second pipe. The specific structure is as follows: The first pipeline (used to connect the first delivery pipe 51 and the first opening 68 of the separator 61): includes a first tee pipe 8 fixed at the end of the first delivery pipe 51 away from the oil tank 2. The other two ports of the first tee pipe 8 face the separator 61, and each port is provided with a first valve 81 for independently controlling the opening and closing of each pipe of the first tee pipe 8. Both ends of the first tee pipe 8 are fixedly connected with sealing flanges, and the ends of the two separators 61 near the first opening 68 are also fixedly connected with matching sealing flanges. Adjacent sealing flanges are sealed and connected by first screws 82 (the first screws 82 are evenly distributed and the number is not less than 4), and a sealing gasket is provided between the flanges, thereby achieving a stable connection between one end of the two separators 61 and the first pipeline, ensuring the air circuit is sealed.

[0034] The second pipeline (used to connect the second delivery pipe 52 and the second opening 69 of the separation cylinder 61): includes a second three-way pipe 9 fixed at the end of the second delivery pipe 52 away from the respirator 53. The other two ports of the second three-way pipe 9 face the separation cylinder 61, and each port is equipped with a second valve 91 for independently controlling the opening and closing of each pipe of the second three-way pipe 9. Both ends of the second three-way pipe 9 are fixedly connected with sealing flanges, and the ends of the two separation cylinders 61 near the second opening 69 are also fixedly connected with matching sealing flanges. Adjacent sealing flanges are sealed and connected by second screws 92 (the second screws 92 are evenly distributed and the number is not less than 4), thereby achieving a stable connection between the other end of the two separation cylinders 61 and the second pipeline.

[0035] It should be noted that this application uses a first three-way pipe 8 and a second three-way pipe 9 to achieve parallel connection of the two separation cylinders 61. In practical applications, five-way pipes, seven-way pipes, and other types of pipes can be flexibly selected according to the number of separation cylinders 61, as long as multiple sets of separation cylinders 61 can be connected in parallel and controlled independently. This application does not limit the specific type of pipe. At the same time, the two separation cylinders 61 can be used alternately and serve as backups for each other. When one of the separation cylinders 61 needs to be repaired, the filter element 671 replaced, or the oil collection chamber 64 cleaned, the first valve 81 or the second valve 91 of the corresponding pipeline can be closed (both the first valve 81 and the second valve 91 are standard models), and the second valve 91 or the first valve 81 of the other separation cylinder 61 can be opened to ensure that the breathing assembly 5 works normally and does not affect the continuous operation of the transformer.

[0036] In addition, the oil leakage warning structure of this transformer is also equipped with a control terminal (not shown). The airflow velocity sensor 7 and the photoelectric oil sensor 66 are both electrically connected to the control terminal, which can transmit the real-time detected airflow parameters and oil level information to the control terminal. The control terminal can judge the equipment operating status according to the preset threshold. When abnormalities occur in the capsule bag 4 or oil leakage, it will issue an audible and visual alarm signal in a timely manner and record the fault information to facilitate the staff to trace and troubleshoot.

[0037] Working principle: When the capsule bag 4 is damaged, its internal air chamber will be exposed inside the oil reservoir 2, causing the oil and gas in the oil storage chamber 3 of the oil reservoir 2 to quickly enter the air chamber and enter the separation cylinder 61 through the first delivery pipe 51 connected to the air chamber.

[0038] After the oil and gas enter the separation cylinder 61 through the first conveying pipe 51, they will undergo three stages of separation processing, as follows: First stage (inside the first cavity 62): Oil and gas enter the first cavity 62 through the first opening 68 and are intercepted by multiple staggered first oil baffles 621. Large-diameter oil droplets carried in the airflow are separated after impacting the first oil baffles 621, and then move down along the oil baffles and finally slide into the oil collection cavity 64.

[0039] Second stage (inside filter element 671): The oil and gas separated in the first stage continue to enter the interior of filter element 671. Filter element 671 further intercepts the small-diameter oil droplets remaining in the airflow. The intercepted small-diameter oil droplets also move down along filter element 671 and eventually flow into oil collection chamber 64.

[0040] The third stage (inside the second cavity 63): The oil and gas separated in the first two stages enter the second cavity 63, where they are intercepted again by multiple staggered second oil baffles 631, further removing the remaining tiny oil droplets in the airflow. These oil droplets then slide down into the oil collection cavity 64.

[0041] Meanwhile, the airflow, which has been completely separated in three stages, enters the second delivery tube 52 through the second opening 69 under the suction action of the respirator 53. At this time, after the rapidly flowing airflow enters the second delivery tube 52, the airflow velocity sensor 7 in the second delivery tube 52 can capture the abnormal signal in real time and promptly feed it back to the control terminal to realize timely reminder of abnormal situations.

[0042] Furthermore, the various oil droplets flowing into the oil collection chamber 64 will gradually accumulate. When the oil surface submerges the probe of the photoelectric oil sensor 66, the sensor will detect the "oil presence" signal and transmit it to the control terminal that is electrically connected to it, thereby promptly reminding the staff that the oil conservator 2 has leaked oil and needs to be dealt with in a timely manner.

[0043] It should be noted that, in this document, terms such as “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0044] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention.

Claims

1. An oil-immersed transformer with an oil leakage warning structure, comprising an oil tank (1), an oil conservator (2), and a connecting pipe for bidirectional flow of oil between the oil tank (1) and the oil conservator (2); the oil conservator (2) is provided with an oil storage chamber (3) and a capsule bag (4) inside, and a breathing assembly (5) is installed on one side of the oil conservator (2), the breathing assembly (5) comprising a first delivery pipe (51), one end of the first delivery pipe (51) being sealed to the opening of the capsule bag (4), and the other end of the first delivery pipe (51) being connected to a breather (53) through a second delivery pipe (52); Its features are: A separation mechanism (6) is provided between the first conveying pipe (51) and the second conveying pipe (52). The separation mechanism (6) includes a separation cylinder (61) with its two ends connected to one end of the first conveying pipe (51) and the second conveying pipe (52) respectively. The separation cylinder (61) is divided into a first cavity (62), a second cavity (63) and an oil collecting cavity (64) from top to bottom. Multiple first oil baffles (621) are arranged alternately in the first cavity (62), and multiple second oil baffles (631) are arranged alternately in the second cavity (63). A photoelectric oil sensor (66) is fixedly installed on the outer wall of the separator (61) near the oil collecting cavity (64) by a support. Its probe is inserted into the oil collecting cavity (64), and the end of the probe is located above the bottom of the oil collecting cavity (64).

2. An oil-immersed transformer with an oil leakage warning structure according to claim 1, characterized in that: An airflow velocity sensor (7) is installed on the outer wall of the second delivery pipe (52) via a fixed support. The probe of the airflow velocity sensor (7) extends into the interior of the second delivery pipe (52) and is in full contact with the airflow inside the pipe.

3. An oil-immersed transformer with an oil leakage warning structure according to claim 1, characterized in that: A frame (67) is fixedly installed at the connection between the first cavity (62) and the second cavity (63). Multiple filter elements (671) are evenly arranged inside the frame (67). The filter element (671) has a hexagonal cross-section. The upper and lower ends of the filter element (671) are connected to the interior of the first cavity (62) and the second cavity (63) respectively. After the airflow is separated by the first cavity (62), it is further filtered by the filter element (671) and then separated again by the second cavity (63).

4. An oil-immersed transformer with an oil leakage warning structure according to claim 1, characterized in that: Multiple first oil baffles (621) and second oil baffles (631) are in an inclined state, and the bottom of the multiple first oil baffles (621) and second oil baffles (631) are close to the oil collection chamber (64); the bottom of the oil collection chamber (64) is fixedly connected to an oil drain pipe (65), which is used to drain the oil collected in the oil collection chamber (64).

5. An oil-immersed transformer with an oil leakage warning structure according to claim 1, characterized in that: The surfaces of the first oil baffle (621) and the second oil baffle (631) are coated with an oleophilic coating, and the top surfaces of the first oil baffle (621) and the second oil baffle (631) are provided with oil guide grooves to guide the oil adhering to the surfaces of the first oil baffle (621) and the second oil baffle (631) to flow to the oil collection chamber (64).

6. An oil-immersed transformer with an oil leakage warning structure according to claim 1, characterized in that: The separator (61) has a first opening (68) at one end near the first cavity (62), and a second opening (69) is provided on the side of the separator (61) near the second cavity (63), and the second opening (69) is located above the oil collecting cavity (64); the first opening (68) and the second opening (69) are both trapezoidal in cross-section.

7. An oil-immersed transformer with an oil leakage warning structure according to claim 6, characterized in that: The first opening (68) and the first delivery pipe (51) are provided with a first pipeline at the end away from the oil pillow (2), and the second opening (69) and the second delivery pipe (52) are provided with a second pipeline at the end away from the respirator (53).

8. An oil-immersed transformer with an oil leakage warning structure according to claim 7, characterized in that: The first pipeline includes a first tee pipe (8) fixed at the end of the first delivery pipe (51) away from the oil tank (2). The other two ports of the first tee pipe (8) face the separator (61), and each port is provided with a first valve (81) for independently controlling the opening and closing of each pipeline of the first tee pipe (8). Both ends of the first three-way pipe (8) are fixedly connected with sealing flanges, and the ends of the two separation cylinders (61) near the first opening (68) are also fixedly connected with matching sealing flanges. A first screw (82) is rotatably connected between two adjacent sealing flanges.

9. An oil-immersed transformer with an oil leakage warning structure according to claim 7, characterized in that: The second pipeline includes a second three-way pipe (9) fixed at the end of the second delivery pipe (52) away from the respirator (53). The other two ports of the second three-way pipe (9) face the separation cylinder (61), and each port is provided with a second valve (91) for independently controlling the opening and closing of each pipeline of the second three-way pipe (9). Both ends of the second three-way pipe (9) are fixedly connected with sealing flanges, and the ends of the two separation cylinders (61) near the second opening (69) are also fixedly connected with matching sealing flanges. A second screw (92) is rotatably connected between two adjacent sealing flanges.

10. An oil-immersed transformer with an oil leakage warning structure according to claim 1, characterized in that: The second delivery pipe (52) has a support plate fixedly connected to the outer wall of one end near the respirator (53), and the other end of the support plate is fixedly connected to one side of the top support (54) of the oil tank (1).

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