A transformer oil static pressure test device

Abstract

The present invention relates to the field of transformer testing technology, a transformer oil static pressure test device, including a shell, a cone bucket is provided at the bottom of the inner cavity of the shell, an oil drain pipe extending to the outside of the bottom of the shell is provided at the central bottom end of the cone bucket, a vertical guide plate is provided above the cone bucket, the outer end of the guide plate is fixedly connected to the inner wall of the shell, a horizontal lifting plate is movably sleeved on the guide plate, the outer periphery of the lifting plate is fitted with the inner wall of the shell, an airbag is connected to the lifting plate, the bottom end of the airbag is fixedly connected to the top of the lifting plate, the top of the airbag is connected to the air supply pipe located outside the shell, the volume of the airbag can swell after high-pressure gas is injected into the airbag, forming a downward driving structure of the lifting plate, and the downward lifting plate forms a pressure structure for the transformer oil in the inner cavity to be output along the oil drain pipe. The present invention is conducive to solving the problems that the airbag structure is simple in some existing transformer oil static pressure devices, the expansion and deformation after gas filling is uncontrollable, and the oil drain hole is easily blocked in advance, resulting in work failure.

Description

Technical Field

[0001] The invention relates to the technical field of transformer testing, and in particular to a transformer oil static pressure testing device. Background Art

[0002] The oil-immersed power transformer manufacturing standard GB / T6451-2015 requires a static pressure sealing test, applying a pressure of 30kPa-50kPa according to different voltage levels to ensure that there is no leakage within different time ranges.

[0003] For high-voltage transformers, it is not possible to use gas of a certain pressure directly on the oil surface of the transformer to pressurize it, so as to avoid the occurrence of unqualified product integration or partial discharge problems caused by excessive gas and gas content in the oil. Previously, the industry usually hung 1-8 cubic meter high-altitude hanging tanks at a height of about 10 meters, and then conducted static pressure tests on the transformers through pipelines. At present, according to the requirements of national fire safety regulations, not only are hanging tanks not allowed to be designed in transformer production workshops, but also any temporary oil tanks are not allowed to be placed. Therefore, a transformer oil static pressure device such as that disclosed in patent CN113932992A has appeared, which realizes oil and gas separation through air bags, and fills the air bags with compressed gas to realize the transmission of oil pressure, so that appropriate oil static pressure can be applied to the transformer body, and oil static pressure leak detection can be realized.

[0004] However, the airbag structure adopted in this technical solution is relatively simple. During the compressed gas filling process, the volume expansion change of the airbag is not controllable. The bottom airbag may swell prematurely, causing the oil in the device to be above the airbag. The airbag will then block the oil drain hole, making it easy for working failures to occur. Summary of the invention

[0005] The present invention provides a transformer oil static pressure testing device, which is helpful to solve the problems that some existing transformer oil static pressure devices have simple airbag structures, uncontrollable expansion and deformation after gas filling, and easy to block the oil drain hole in advance, resulting in working failure.

[0006] The present invention is achieved in that:

[0007] A transformer oil static pressure testing device comprises a shell for filling transformer oil, a cone bucket which is wide at the top and narrow at the bottom is provided at the bottom of the inner cavity of the shell, an oil drain pipe which extends to the outside of the bottom of the shell is provided at the central bottom end of the cone bucket, a vertical rib is provided on the upper end face of the cone bucket, a plurality of ribs are centrally symmetrical with respect to the axial center line of the cone bucket, a vertical guide plate is connected at the connection between the top of each rib and the inner wall of the shell, the outer end of the guide plate is fixedly connected to the inner wall of the shell, a horizontal lifting plate is movably sleeved on the guide plate, the periphery of the lifting plate is fitted with the inner wall of the shell, an air bag is connected to the lifting plate, the bottom end of the air bag is fixedly connected to the top of the lifting plate, the top of the air bag is communicated with an air supply pipe located on the outside of the shell, the outer end of the air supply pipe is connected to an external air compressor, the volume of the air bag can swell after high-pressure gas is injected into it, thereby forming a downward driving structure of the lifting plate, and the downward lifting plate forms a pressure-applying structure for outputting transformer oil in the inner cavity along the oil drain pipe.

[0008] On the basis of the above technical solution, the shell is a sealed cylindrical structure, and the top outer end of the cone bucket is closed and connected to the inner side of the shell.

[0009] Based on the above technical solution, a support beam is provided at the bottom of the cone bucket.

[0010] On the basis of the above technical solution, a horizontal partition is fixedly connected to the top of the rib plate, and a plurality of longitudinal through-hole structure perforations are evenly distributed on the partition plate. A gap is left between the outer periphery of the partition plate and the inner side wall of the shell, and the gap constitutes a side groove, and the side groove is divided into a plurality of arc-shaped through-hole grooves by a guide plate; after the lifting plate descends, the transformer oil in the inner cavity above the partition plate can pass through the side grooves and the perforations to the bottom of the partition plate.

[0011] On the basis of the above technical solution, the guide plate and the partition are an integrated structure, the top of the cone bucket is located between two adjacent ribs to form a guide groove, and the top of the guide groove is located directly below the side groove.

[0012] On the basis of the above technical solution, the cross-sectional profile of the airbag is a ring structure, and a plurality of airbags are arranged on the lifting plate at intervals in the horizontal direction, and the top of each airbag is independently connected to an air supply pipe.

[0013] On the basis of the above technical solution, the shell is provided with an air-uniform cavity at the top of the airbag, and the plurality of air-uniform cavities correspond one to one with the internal space of each airbag. The air-uniform cavity is located between the airbag and the air supply pipe and constitutes an air-uniform communication structure.

[0014] On the basis of the above technical solution, each gas uniforming cavity is independently provided with a pressure gauge.

[0015] On the basis of the above technical solution, a sealing plate is provided at the bottom of the gas-uniform cavity, and a plurality of connecting holes are provided on the sealing plate, and the connecting holes penetrate the sealing plate so that the gas-uniform cavity and the airbag are connected.

[0016] Compared with the prior art, the present invention has at least the following advantages:

[0017] 1. The present invention provides a cone bucket, ribs, guide plates, lifting plates and airbag structures, uses airbags to drive the lifting plates to rise and fall, and uses indirect pressure instead of direct pressure from airbags, effectively avoiding the uncontrollability of airbag swelling and deformation, thereby achieving precise control of the transformer oil static pressure test process. When filled with high-pressure gas, the airbag can expand evenly and push the lifting plate downward. This process has high stability in repetitive operations, thereby applying a stable and controllable appropriate static pressure to the transformer oil. This structure also avoids the problem of excessive gas in the oil and excessive gas content caused by directly applying high-pressure gas to the oil surface in the traditional method.

[0018] 2. The present invention ensures that the oil can flow smoothly when the lifting plate moves downward by setting structures such as partitions, perforations, side grooves and guide grooves, avoiding the problem of uneven pressure caused by oil accumulation. At the same time, this structure can also improve the stability and reliability of the device.

[0019] 3. The present invention further improves the uniformity and controllability of the device by setting up multiple airbags and uniform air chambers. Each airbag can expand evenly, avoiding the problem of local excessive swelling causing blockage of the oil drain hole. At the same time, the setting of the uniform air chamber can make the high-pressure gas evenly distributed when filling the airbag, further improving the uniformity of the expansion of the airbag.

[0020] 4. The present invention can monitor the pressure inside each airbag in real time by setting up monitoring equipment such as pressure gauges to ensure that the device remains within a safe range during the test. At the same time, by comparing the readings of each pressure gauge, potential problems can be discovered and solved in a timely manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a structural schematic diagram of a transformer oil static pressure test device;

[0023] Figure 2 for Figure 1 Schematic diagram of the use status of the transformer oil static pressure test device;

[0024] Figure 3 for Figure 1 A longitudinal section view of

[0025] Figure 4 for Figure 1 Two-section oblique section view;

[0026] Figure 5 for Figure 3 A top view of the installation structure of the middle partition;

[0027] Figure 6 for Figure 2 Schematic diagram of the distribution structure of the middle airbag;

[0028] Figure 7 This is a schematic diagram of gas flow during the pressurization process;

[0029] Figure 8 Schematic diagram of the structural changes of the airbag and lifting plate after pressurization.

[0030] Labels in the figure: 100, shell; 110, cone bucket; 111, support beam; 130, rib plate; 131, guide groove; 140, partition; 141, perforation; 142, side groove; 150, guide plate; 160, lifting plate; 170, airbag assembly; 171, first airbag; 172, second airbag; 173, third airbag; 180, uniform air chamber; 181, first air chamber; 182, second air chamber; 183, third air chamber; 184, connecting hole; 120, oil drain pipe; 200, air supply pipe; 210, first air inlet pipe; 220, second air inlet pipe; 230, third air inlet pipe; 300, pressure gauge; 400, transformer. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention.

[0032] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0033] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to an element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0034] The invention provides a transformer oil static pressure testing device, aiming to solve the problems of some existing transformer oil static pressure devices, such as simple airbag structure, uncontrollable expansion and deformation after gas filling, and easy early clogging of oil drain holes, leading to working failures.

[0035] The present invention provides a transformer oil static pressure testing device, comprising a shell for filling transformer oil, a cone bucket which is wide at the top and narrow at the bottom is provided at the bottom of the inner cavity of the shell, an oil drain pipe which extends to the outside of the bottom of the shell is provided at the central bottom end of the cone bucket, a vertical rib is provided on the upper end face of the cone bucket, a plurality of ribs are centrally symmetrical with respect to the axial center line of the cone bucket, a vertical guide plate is connected at the connection between the top of each rib and the inner wall of the shell, the outer end of the guide plate is fixedly connected to the inner wall of the shell, a horizontal lifting plate is movably sleeved on the guide plate, the periphery of the lifting plate is fitted with the inner wall of the shell, an airbag is connected to the lifting plate, the bottom end of the airbag is fixedly connected to the top of the lifting plate, the top of the airbag is connected to the air supply pipe located on the outside of the shell, the outer end of the air supply pipe is connected to an external air compressor, the volume of the airbag can swell after high-pressure gas is injected into it, thereby forming a downward driving structure of the lifting plate, and the downward lifting plate forms a pressure-applying structure for outputting transformer oil in the inner cavity along the oil drain pipe.

[0036] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] like Figure 1 As shown, this embodiment discloses a transformer oil static pressure testing device, which includes a shell 100 for filling transformer oil. The shell 100 is a sealed cylindrical structure. The shell 100 serves as the main load-bearing support structure, and is connected to an air supply pipe 200 on the top, and cooperates with a pressure gauge 300 to perform internal pressure detection.

[0038] Combination Figure 3 As shown, a cone bucket 110 with a wide top and narrow bottom is provided at the bottom of the inner cavity of the housing 100, and the top outer end of the cone bucket 110 is closed and connected to the inner side of the housing 100. An oil drain pipe 120 extending to the outer side of the bottom of the housing 100 is provided at the central bottom end of the cone bucket 110. The oil drain pipe 120 is used to output the transformer oil in the inner cavity of the housing 100 during the static pressure test, and transport it to the inside of the transformer 400 in conjunction with the pipeline.

[0039] Furthermore, in order to make the structure of the cone bucket 110 more stable and reliable, so as to ensure that the structure remains stable after internal pressurization, a support beam 111 is provided at the bottom of the cone bucket 110. The support beam 111 is two circular plates spaced apart inside and outside. The bottom of the support beam 111 is connected to the bottom of the shell 100, and the top of the support beam 111 is connected to the bottom of the cone bucket 110.

[0040] The upper end surface of the cone bucket 110 is provided with vertical ribs 130, and the eight ribs 130 are centrally symmetrical with respect to the axial center line of the cone bucket 110. Figure 4 and Figure 5 As shown, the top of the rib plate 130 is fixedly connected with a horizontal partition plate 140, which is a circular plate body, and has a plurality of longitudinal through-holes 141 evenly distributed on the partition plate 140. A gap is left between the outer periphery of the partition plate 140 and the inner wall of the shell 100, and the gap constitutes a side groove 142. The function of the partition plate 140 is to make the upper end of the cone bucket 110 have a stable baffle structure. The partition plate 140 can also use the through holes 141 and the side grooves 142 as a diversion guide structure during the flow of transformer oil, so that the flow of transformer oil is more uniform and stable, thereby maintaining a stable balance resistance condition for the top structure in the reverse direction, and making the activity of the pressure structure more stable and controllable.

[0041] A vertical guide plate 150 is connected to the connection between the top of each rib plate 130 and the inner wall of the shell 100. The rib plate 130 and the guide plate 150 are an integrated structure, and the outer end of the guide plate 150 is fixedly connected to the inner wall of the shell 100. A horizontal lifting plate 160 is movably sleeved on the guide plate 150. The outer periphery of the lifting plate 160 is arranged in close contact with the inner wall of the shell 100. An airbag assembly 170 is connected to the lifting plate 160. The bottom end of the airbag assembly 170 is fixedly connected to the top of the lifting plate 160. The top of the airbag assembly 170 is connected to the air supply pipe 200 located outside the shell 100. The outer end of the air supply pipe 200 is connected to an external air compressor. When working, the airbag assembly 170 can swell in volume after high-pressure gas is injected into the inside, forming a downward driving structure of the lifting plate 160. The downward lifting plate 160 forms a pressure structure for the transformer oil in the inner cavity to be output along the oil drain pipe 120.

[0042] Specifically, in this embodiment, the airbag assembly 170 includes a first airbag 171, a second airbag 172 and a third airbag 173 arranged inside and outside. The inner ends of the first airbag 171, the second airbag 172 and the third airbag 173 are three independent air cavity structures. The cross-sectional profile of each airbag is a ring structure. The deformation direction of the airbag before and after inflation is mainly the up and down direction, and it has a certain degree of lateral extension ability. It should be noted that the third airbag 173 can be closely abutted against the inner wall of the shell 100 after swelling to form a stable downward pressure structure. This layered structure makes the inflation process more refined and controllable, and has a division of labor effect in function. The first airbag 171 is located on the inside and can provide the core driving force for the lifting and lowering activities of the lifting plate 160; the third airbag 173 is located on the outside and can provide reliable sealing and space filling effects for the periphery; the second airbag 172 can provide auxiliary effects to assist the first airbag 171 and the third airbag 173 to achieve high-quality operation results.

[0043] Furthermore, the housing 100 is provided with an air-homogenizing cavity 180 at the top of the airbag, and the air-homogenizing cavity 180 includes a first air cavity 181, a second air cavity 182, and a third air cavity 183 distributed inside and outside, and a sealing plate is provided at the bottom of each air cavity, and corresponding connecting holes 184 are provided on the sealing plate at positions corresponding to each air cavity, so that the first air cavity 181 is connected with the first airbag 171, the second air cavity 182 is connected with the second airbag 172, and the third air cavity 183 is connected with the third airbag 173. The air supply pipe 200 includes a first air inlet pipe 210, a second air inlet pipe 220, and a third air inlet pipe 230. The top of the first air cavity 181 is connected with the first air inlet pipe 210, the top of the second air cavity 182 is connected with the second air inlet pipe 220, and the top of the third air cavity 183 is connected with the third air inlet pipe 230. A solenoid valve is independently provided on each air inlet pipe for independently controlling the air supply state. The function of the gas homogenizing chamber 180 is to preliminarily homogenize the high-pressure gas input from the gas supply pipe 200 so that the high-pressure gas can be evenly and stably injected into each airbag, thereby improving the controllability of the airbag swelling.

[0044] It should be noted that the side groove 142 is divided into a plurality of arc-shaped through-hole grooves by the guide plate 150; after the lifting plate 160 descends, the transformer oil in the inner cavity above the partition 140 can pass through the side groove 142 and the through hole 141 to the bottom of the partition 140. The guide plate 150 and the partition 140 are an integrated structure, and the top of the cone bucket 110 is located between two adjacent ribs 130 to form a guide groove 131, and the top of the guide groove 131 is located directly below the side groove 142, forming multiple uniform guide flow paths, so that the transformer oil after being pressurized can smoothly and uniformly descend along each guide flow path.

[0045] In order to monitor the pressure of each airbag in real time, each gas-uniform cavity 180 is independently provided with a pressure gauge 300 .

[0046] Combination Figure 2 As shown, during the test, the oil drain pipe 120 is connected to the main body of the transformer 400 through a pipeline, so that the transformer oil inside the static pressure test device can be transferred to the inside of the main body of the transformer 400 for static pressure testing. Figure 7 and Figure 8 According to the actual pressure requirement, the first air inlet pipe 210, the second air inlet pipe 220 and the third air inlet pipe 230 are used to inject high-pressure gas into the first airbag 171, the second airbag 172 and the third airbag 173, and then each airbag expands and deforms in the longitudinal and transverse directions, driving the lifting plate 160 downward. The lifting plate 160 is guided by the guide plate 150 and moves downward stably. The downward movement of the lifting plate 160 will compress the transformer oil below the lifting plate 160, forcing the transformer oil in this area to move downward. The transformer oil mainly passes through the side groove 142 and flows along the guide groove 131 to the oil drain pipe 120 for external discharge. In this process, part of the transformer oil will also pass through the perforation 141 downward to share the circulation burden of the side groove 142. In this way, the transformer oil inside the static pressure device can be evenly and stably input into the main body of the transformer 400 to achieve a stable and reliable static pressure test.

[0047] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A transformer oil static pressure test device, characterized in that: The invention comprises a shell (100) for filling transformer oil, wherein a cone bucket (110) which is wide at the top and narrow at the bottom is provided at the bottom of the inner cavity of the shell (100), an oil drain pipe (120) which extends to the outside of the bottom of the shell (100) is provided at the central bottom end of the cone bucket (110), and a vertical rib plate (130) is provided at the upper end surface of the cone bucket (110), and a plurality of the rib plates (130) are centrally symmetrical with respect to the axial center line of the cone bucket (110), and a vertical guide plate (150) is connected to the connection between the top of each rib plate (130) and the inner side wall of the shell (100), and the outer side end of the guide plate (150) is fixedly connected to the inner side wall of the shell (100), so that the guide plate (150) can be guided to the inner side wall of the shell (100) and the inner side wall of the shell (100). A horizontal lifting plate (160) is movably sleeved on the plate (150), the outer periphery of the lifting plate (160) is arranged in close contact with the inner wall of the shell (100), an air bag is connected to the lifting plate (160), the bottom end of the air bag is fixedly connected to the top of the lifting plate (160), the top of the air bag is connected to the air supply pipe (200) located outside the shell (100), the outer end of the air supply pipe (200) is connected to an external air compressor, and the volume of the air bag can swell after high-pressure gas is injected into the air bag, forming a downward driving structure of the lifting plate (160), and the downward lifting plate (160) forms a pressure structure for the transformer oil in the inner cavity to be discharged along the oil discharge pipe (120).

2. A transformer oil static pressure test device according to claim 1, characterized in that: The shell (100) is a sealed cylindrical structure, and the top outer end of the cone bucket (110) is closed and connected to the inner side of the shell (100).

3. A transformer oil static pressure test device according to claim 2, characterized in that: A support beam (111) is provided at the bottom of the cone bucket (110).

4. A transformer oil static pressure test device according to claim 1, characterized in that: A horizontal partition (140) is fixedly connected to the top of the rib plate (130), and a plurality of longitudinal through-hole structured perforations (141) are evenly distributed on the partition plate (140). A gap is left between the outer periphery of the partition plate (140) and the inner side wall of the shell (100), and the gap forms a side groove (142). The side groove (142) is divided into a plurality of arc-shaped through-hole grooves by the guide plate (150); after the lifting plate (160) moves downward, the transformer oil in the inner cavity above the partition plate (140) can pass through the side groove (142) and the perforations (141) to the bottom of the partition plate (140).

5. A transformer oil static pressure test device according to claim 4, characterized in that: The guide plate (150) and the partition plate (140) are an integrated structure; the top of the cone bucket (110) is located between two adjacent ribs (130) to form a guide groove (131); the top of the guide groove (131) is located directly below the side groove (142).

6. A transformer oil static pressure test device according to claim 1, characterized in that: The cross-sectional profile of the airbag is a ring structure, and a plurality of airbags are arranged on the lifting plate (160) at intervals in the horizontal direction, and the top of each airbag is independently connected to an air supply pipe (200).

7. A transformer oil static pressure test device according to claim 6, characterized in that: The housing (100) is provided with an air-homogenizing cavity (180) located at the top of the airbag, and the plurality of air-homogenizing cavities (180) correspond to the internal spaces of the airbags one by one. The air-homogenizing cavities (180) are located between the airbag and the air supply pipe (200) and form an air-homogenizing communication structure.

8. A transformer oil static pressure test device according to claim 7, characterized in that: Each gas uniforming cavity (180) is independently provided with a pressure gauge (300).

9. A transformer oil static pressure test device according to claim 7, characterized in that: The bottom of the gas-uniform cavity (180) is provided with a sealing plate, and a plurality of communication holes (184) are provided on the sealing plate. The communication holes (184) penetrate the sealing plate so that the gas-uniform cavity (180) and the airbag are connected.

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