Discharge model for simulating bubbles in transformer oil

Abstract

The utility model discloses a discharge model for simulating bubbles in transformer oil, which relates to the technical field of electrical test, and comprises an oil cylinder, a high-voltage electrode, a low-voltage electrode and a circulating mechanism, a sealing cavity is formed in the oil cylinder, insulating oil is contained in the sealing cavity, and a first through hole and a second through hole are respectively arranged on two opposite sides of the oil cylinder; the high-voltage electrode is located in the sealing cavity and led out of the oil cylinder through a high-voltage lead. The low-voltage electrode is located in the sealing cavity, is spaced from the high-voltage electrode and is led out of the oil cylinder through a low-voltage lead; the circulating mechanism comprises an oil pump and a circulating pipe, two ends of the circulating pipe are respectively communicated with the first through hole and the second through hole to form a circulating loop, the oil pump can pump the insulating oil to circularly flow along the circulating loop, the circulating pipe is communicated with an air source, and the air source can inject bubbles into the insulating oil through the circulating pipe. The discharge model provided by the utility model can more accurately simulate the discharge process of the bubbles under the flowing of the insulating oil, and improves the simulation degree of the test.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical tests, and particularly relates to a discharge model for simulating bubbles in transformer oil. Background Art

[0002] A transformer is a core device in the power grid. Ensuring the safe operation of the transformer is of great significance for ensuring the safe operation of the power grid. During the operation of the transformer, various factors can easily cause gas generation inside the transformer oil tank. For example, the increase in oil temperature can cause the decomposition of oil-impregnated insulating paper fibers due to chain breakage, the insulation inside the oil tank can get damp in a humid environment, and the insulating oil can deteriorate and decompose during long-term use, etc. The gas generated in these cases exists in the insulating oil of the transformer in the form of bubbles. Under the influence of the transformer, an electric field will be generated in the bubbles. When the electric field strength inside the bubbles is higher than their withstand electric field strength, partial discharge will occur. The partial discharge will cause positive and negative charges to accumulate at both ends of the bubbles, and then cause the electric field strength at the tips of the bubbles to increase, which may cause the insulating oil inside the transformer oil tank to be broken down, affecting the insulation performance of the transformer.

[0003] Since the discharge process of the bubbles is relatively complex, the existing discharge models are difficult to accurately simulate the discharge process of the bubbles in the transformer oil tank, resulting in a large deviation between the simulation test results and the actual situation, and a low test simulation degree. Summary of the Utility Model

[0004] The main purpose of the utility model is to propose a discharge model for simulating bubbles in transformer oil, aiming to solve the technical problem that the existing discharge models are difficult to accurately simulate the discharge process of the bubbles in the transformer insulating oil, resulting in a large deviation between the simulation test results and the actual situation, and a low test simulation degree.

[0005] To achieve the above purpose, the discharge model for simulating bubbles in transformer oil proposed by the utility model includes an oil cylinder, a high-voltage electrode, a low-voltage electrode and a circulation mechanism. A sealed cavity is formed inside the oil cylinder, and insulating oil is contained in the sealed cavity. A first through hole and a second through hole communicating with the sealed cavity are respectively opened on two opposite sides of the oil cylinder; the high-voltage electrode is located inside the sealed cavity and is led out of the oil cylinder through a high-voltage lead; the low-voltage electrode is located inside the sealed cavity and is arranged at an interval from the high-voltage electrode. The low-voltage electrode is led out of the oil cylinder through a low-voltage lead. Both the high-voltage electrode and the low-voltage electrode are immersed in the insulating oil; the circulation mechanism includes an oil pump and a circulation pipe. The two ends of the circulation pipe are respectively communicated with the first through hole and the second through hole, so that the circulation pipe and the sealed cavity are communicated to form a circulation loop. The oil pump is connected to the circulation pipe to pump the insulating oil to circulate along the circulation loop. The circulation pipe is also communicated with a gas source, and the gas source can inject bubbles into the insulating oil inside the sealed cavity through the circulation pipe.

[0006] In one embodiment, the circulation pipe includes an oil inlet pipe and an oil outlet pipe. The inlet of the oil pump is communicated with the first through hole through the oil inlet pipe, and the outlet of the oil pump is communicated with the second through hole through the oil outlet pipe. The gas source is communicated with the oil outlet pipe.

[0007] In one embodiment, a discharge space is formed between the high-voltage electrode and the low-voltage electrode. One end of the oil inlet pipe away from the inlet of the oil pump and one end of the oil outlet pipe away from the outlet of the oil pump respectively extend into both sides of the discharge space.

[0008] In one embodiment, the high-voltage electrode and the low-voltage electrode are arranged at intervals in the vertical direction, and the first through hole and the second through hole are respectively opened on opposite sides of the oil cylinder in the horizontal direction.

[0009] In one embodiment, a high-voltage sleeve is sleeved on the high-voltage lead, and the high-voltage sleeve vertically penetrates the cylinder wall of the insulating oil cylinder.

[0010] In one embodiment, both the high-voltage electrode and the low-voltage electrode are spherical electrodes.

[0011] In one embodiment, the discharge model for simulating bubbles in transformer oil further includes a temperature component. The temperature component is arranged in the sealed cavity. The temperature component includes a heating device and a thermometer. The heating device is used to heat the insulating oil, and the thermometer is used to measure the temperature of the insulating oil.

[0012] In one embodiment, the oil cylinder is a plexiglass oil cylinder.

[0013] In one embodiment, the insulating oil is mineral oil or vegetable oil.

[0014] In one embodiment, a flow meter is arranged on the circulation pipe.

[0015] The discharge model for simulating bubbles in transformer oil proposed by the present utility model is as follows: By containing insulating oil in the sealed cavity of the oil cylinder, a circulation pipe is set to communicate with the sealed cavity to form a circulation loop. The insulating oil is pumped by an oil pump to flow along the circulation loop. An air source is connected to the circulation pipe so that the air source can inject bubbles into the sealed cavity through the circulation pipe. A high voltage is applied to the sealed cavity through a high-voltage electrode to form an electric field, causing the bubbles in the sealed cavity to discharge under the influence of the electric field, thereby simulating the process of bubbles in the transformer oil tank discharging under the influence of the electric field, facilitating researchers to study the discharge characteristics of bubbles in the transformer oil tank. The discharge model proposed by the present utility model makes the two ends of the circulation pipe communicate with the first through hole and the second through hole respectively opened on the opposite sides of the oil cylinder, and by setting an oil pump to make the insulating oil flow in the circulation loop, the flow process of the insulating oil is more consistent with the actual flow process of the insulating oil in the transformer oil tank, and can more accurately simulate the discharge process of bubbles under the flow of insulating oil, effectively improving the simulation degree of the test. Brief Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0017] Figure 1 FIG. is a schematic structural diagram of an embodiment of the discharge model for simulating bubbles in transformer oil provided by the present utility model.

[0018] Explanation of the Reference Numerals in the Drawings:

[0019] 10. Oil cylinder; 11. Sealed cavity; 12. First through hole; 12. Second through hole; 20. High-voltage electrode; 30. Low-voltage electrode; 40. Circulation mechanism; 41. Circulation pipe; 411. Inlet pipe; 412. Outlet pipe; 42. Oil pump; 50. High-voltage bushing; 60. Air source.

[0020] The realization, functional characteristics and advantages of the object of the present utility model will be further described with reference to the embodiments and the drawings. Detailed Embodiment

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0022] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, then such directional indications are only used to explain the relative positional relationship, movement conditions, etc. between components in a specific posture. If this specific posture changes, then the directional indications will also change accordingly.

[0023] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, then such descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel scenarios. Taking "A and / or B" as an example, it includes scenario A, or scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or is unable to be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0024] The descriptions of directions such as "up", "down", "left", "right", etc. in the present utility model are based on Figure 1 the directions shown, and are only used to explain the relative positional relationship between components in Figure 1 the posture shown. If this specific posture changes, then the directional indications will also change accordingly.

[0025] Since the discharge process of bubbles is relatively complex, the discharge models in the prior art are difficult to accurately simulate the discharge process of bubbles in the transformer oil tank, resulting in a large deviation between the simulation test results and the actual situation, and a low test simulation degree.

[0026] The utility model provides a discharge model for simulating bubbles in transformer oil, which comprises an oil cylinder 10, a high-voltage electrode 20, a low-voltage electrode 30 and a circulation mechanism 40. A sealed cavity 11 is formed in the oil cylinder 10, and insulating oil is contained in the sealed cavity 11. A first through hole 12 and a second through hole 12 communicated with the sealed cavity 11 are respectively formed in two opposite sides of the oil cylinder 10. The high-voltage electrode 20 is located in the sealed cavity 11 and led out of the oil cylinder 10 through a high-voltage lead wire. The low-voltage electrode 30 is located in the sealed cavity 11 and arranged at an interval with the high-voltage electrode 20, and the low-voltage electrode 30 is led out of the oil cylinder 10 through a low-voltage lead wire. Both the high-voltage electrode 20 and the low-voltage electrode 30 are immersed in the insulating oil. The circulation mechanism 40 comprises an oil pump 42 and a circulation pipe 41. Two ends of the circulation pipe 41 are respectively communicated with the first through hole 12 and the second through hole 12, so that the circulation pipe 41 and the sealed cavity 11 are communicated to form a circulation loop. The oil pump 42 is connected to the circulation pipe 41 to pump the insulating oil to circulate along the circulation loop. The circulation pipe 41 is also communicated with a gas source 60, and the gas source 60 can inject bubbles into the insulating oil in the sealed cavity 11 through the circulation pipe 41.

[0027] Please refer to Figure 1 , the high-voltage electrode 20 and the low-voltage electrode 30 are arranged at an interval in the sealed cavity 11 and both are immersed in the insulating oil. The circulation pipe 41 is communicated with the sealed cavity 11 to form a circulation loop. The oil pump 42 can pump the insulating oil to circulate between the sealed cavity 11 and the circulation pipe 41. The circulation pipe 41 is communicated with a gas source 60. The gas source 60 injects gas into the circulation pipe 41, and the gas forms bubbles in the insulating oil. The bubbles enter the sealed cavity 11 from the circulation pipe 41 along the circulation loop. At this time, a high voltage is applied to the sealed cavity 11 by the high-voltage electrode 20 to form an electric field, and the bubbles are discharged under the influence of the electric field of the high-voltage electrode 20, so that researchers can study the discharge characteristics of the bubbles.

[0028] The discharge model for simulating bubbles in transformer oil proposed by the present utility model is as follows. Insulating oil is filled in the sealed cavity 11 of the oil cylinder 10. A circulation pipe 41 is provided and connected to the sealed cavity 11 to form a circulation loop. The insulating oil is pumped by an oil pump 42 to flow along the circulation loop. A gas source 60 is connected to the circulation pipe 41, so that the gas source 60 can inject bubbles into the sealed cavity 11 through the circulation pipe 41. A high voltage is applied to the sealed cavity 11 by a high-voltage electrode 20 to form an electric field, causing the bubbles in the sealed cavity 11 to discharge under the influence of the electric field, thereby simulating the process of bubbles in the transformer oil tank discharging under the influence of the electric field, which is convenient for researchers to study the discharge characteristics of bubbles in the transformer oil tank. The discharge model proposed by the present utility model makes the two ends of the circulation pipe 41 communicate with the first through hole 12 and the second through hole 12 respectively opened on the opposite sides of the oil cylinder 10, and the oil pump 42 is provided to make the insulating oil flow in the circulation loop, making the flow process of the insulating oil more conform to the actual flow process of the insulating oil in the transformer oil tank, and being able to more accurately simulate the discharge process of bubbles under the flow of insulating oil, effectively improving the simulation degree of the test.

[0029] In an embodiment, the circulation pipe 41 includes an oil inlet pipe 411 and an oil outlet pipe 412. The inlet of the oil pump 42 is connected to the first through hole 12 through the oil inlet pipe 411, and the outlet of the oil pump 42 is connected to the second through hole 12 through the oil outlet pipe 412. The gas source 60 is connected to the oil outlet pipe 412.

[0030] It can be understood that the inlet end of the oil pump 42 is connected to the first through hole 12 of the oil cylinder 10 through the oil inlet pipe 411 to ensure that the oil pump 42 can suck insulating oil from the sealed cavity 11. The outlet end of the oil pump 42 is connected to the second through hole 12 through the oil outlet pipe 412 to re-inject the pumped oil into the sealed cavity 11, forming a closed circulation loop to make the flow direction of the insulating oil smoother. The gas source 60 is connected to the oil outlet pipe 412, so that the gas injected by the gas source 60 can inject bubbles into the sealed cavity 11 faster, enabling the bubbles to be formed in the oil flow pressurized by the oil pump 42, being closer to the generation conditions of bubbles in the actual transformer oil, and making the test results more accurate.

[0031] In an embodiment, a discharge space is formed between the high-voltage electrode 20 and the low-voltage electrode 30. One end of the oil inlet pipe 411 away from the inlet of the oil pump 42 and one end of the oil outlet pipe 412 away from the outlet of the oil pump 42 respectively extend into both sides of the discharge space.

[0032] It should be noted that one end of the inlet pipe 411 far from the inlet of the oil pump 42 and one end of the outlet pipe 412 far from the outlet of the oil pump 42 respectively extend into both sides of the discharge space, which helps to directly introduce insulating oil and bubbles into the discharge space during the oil flow circulation process, enabling the electric field change caused by the voltage applied by the high-voltage electrode 20 to better act on the bubbles. It can be explained that the voltage applied by the high-voltage electrode 20 can be alternating current, direct current or impulse voltage.

[0033] In one embodiment, the high-voltage electrode 20 and the low-voltage electrode 30 are arranged at intervals up and down, and the first through hole 12 and the second through hole 12 are respectively opened on the opposite sides of the oil cylinder 10 in the horizontal direction.

[0034] Please refer to Figure 1 , the high-voltage electrode 20 and the low-voltage electrode 30 are respectively located Figure 1 above and below the sealed cavity 11 in , making the high-voltage electrode 20 and the low-voltage electrode 30 more conform to the actual situation of the electric field in the transformer, and can more accurately simulate the electric field distribution inside the transformer, especially the electric field gradient in the vertical direction. The first through hole 12 and the second through hole 12 are respectively located Figure 1 on the left and right sides of the oil cylinder 10 in , which helps the oil flow to circulate horizontally, thus forming a uniform oil flow environment in the discharge space.

[0035] In one embodiment, a high-voltage bushing 50 is sleeved on the high-voltage lead, and the high-voltage bushing 50 vertically penetrates the cylinder wall of the insulating oil cylinder 10. It can be understood that the setting of the high-voltage bushing 50 protects the high-voltage lead from the erosion of the internal environment of the oil cylinder 10, and also provides good insulation performance, ensuring the safe connection between the high-voltage electrode 20 and the external circuit. The high-voltage bushing 50 helps to maintain the sealing of the inside of the oil cylinder 10, prevent external pollutants from entering, and also protects the high-voltage lead from mechanical damage.

[0036] In one embodiment, both the high-voltage electrode 20 and the low-voltage electrode 30 are spherical electrodes.

[0037] It should be noted that both the high-voltage electrode 20 and the low-voltage electrode 30 adopt spherical electrodes. Due to the geometric characteristics of the spherical electrodes, a relatively uniform electric field can be generated in the discharge space, which helps to more accurately simulate the discharge conditions in the actual transformer oil.

[0038] In one embodiment, the discharge model for simulating bubbles in transformer oil further includes a temperature component. The temperature component is arranged in the sealed cavity 11. The temperature component includes a heating device and a thermometer. The heating device is used to heat the insulating oil, and the thermometer is used to measure the temperature of the insulating oil.

[0039] In this embodiment, the discharge model for simulating bubbles in transformer oil further adds a temperature component to simulate different temperature conditions that transformer oil may encounter during actual operation. By setting up a heating device, the insulating oil in the oil cylinder 10 is brought to the specified temperature of the test conditions, while the thermometer is used to monitor the temperature of the insulating oil in real time to ensure that the test is carried out within the controlled temperature range.

[0040] In one embodiment, the oil cylinder 10 is a plexiglass oil cylinder 10.

[0041] It can be understood that the oil cylinder 10 is made of plexiglass material, which gives the oil cylinder 10 good insulation properties, enables the oil cylinder 10 to more closely simulate the transformer oil tank, and can effectively prevent voltage leakage to ensure electrical safety during the test. At the same time, plexiglass has good transparency, which is convenient for testers to observe the test process inside the oil cylinder 10.

[0042] In one embodiment, the insulating oil is mineral oil or vegetable oil. It can be understood that using different types of insulating oil allows testers to study the behavior of bubbles during the discharge process in different types of insulating oil, providing data support for the selection and optimization of the insulating oil type of the transformer.

[0043] In one embodiment, a flow meter is provided on the circulation pipe 41, enabling the tester to monitor the flow rate of the oil flow in real time, ensuring that the pumping rate of the oil pump 42 meets the experimental requirements, and making the test environment more conform to the actual environment inside the transformer oil tank.

[0044] It should be added that the circulation pipe 41 is made of insulating material, which can be a plastic pipe or a PVC pipe. According to the different gases generated in the transformer oil tank, the circulation pipe 41 can be connected to different gas sources 60, such as hydrogen, acetylene, etc., so that the type of gas injected by the gas source 60 is the same as the type of gas actually generated in the transformer oil tank, facilitating the study of the discharge process of bubbles under different gas types.

[0045] The above are only exemplary embodiments of the present utility model, and do not limit the patent scope of the present utility model. Any equivalent structural transformation made under the technical concept of the present utility model by using the content of the specification and drawings of the present utility model, or any direct / indirect application in other related technical fields, is included in the patent protection scope of the present utility model.

Claims

1. A discharge model for simulating bubbles in transformer oil, characterized in that, Comprising: An oil cylinder, a sealed cavity is formed inside the oil cylinder, insulating oil is contained in the sealed cavity, and a first through hole and a second through hole communicating with the sealed cavity are respectively opened on opposite sides of the oil cylinder; A high-voltage electrode, which is located inside the sealed cavity and is led out of the oil cylinder through a high-voltage lead; A low-voltage electrode, which is located inside the sealed cavity and is arranged at an interval from the high-voltage electrode, the low-voltage electrode is led out of the oil cylinder through a low-voltage lead, and both the high-voltage electrode and the low-voltage electrode are immersed in the insulating oil; A circulation mechanism, the circulation mechanism includes an oil pump and a circulation pipe, both ends of the circulation pipe are respectively communicated with the first through hole and the second through hole, so that the circulation pipe and the sealed cavity are communicated to form a circulation loop, the oil pump is connected to the circulation pipe to pump the insulating oil to circulate along the circulation loop, the circulation pipe is also communicated with a gas source, and the gas source can inject bubbles into the insulating oil in the sealed cavity through the circulation pipe.

2. The discharge model for simulating bubbles in transformer oil according to claim 1, characterized in that, The circulation pipe includes an oil inlet pipe and an oil outlet pipe, the inlet of the oil pump is communicated with the first through hole through the oil inlet pipe, the outlet of the oil pump is communicated with the second through hole through the oil outlet pipe, and the gas source is communicated with the oil outlet pipe.

3. The discharge model for simulating bubbles in transformer oil according to claim 2, characterized in that, A discharge space is formed between the high-voltage electrode and the low-voltage electrode, and one end of the oil inlet pipe far from the inlet of the oil pump and one end of the oil outlet pipe far from the outlet of the oil pump respectively extend into both sides of the discharge space.

4. The discharge model for simulating bubbles in transformer oil according to claim 1, characterized in that The high-voltage electrode and the low-voltage electrode are arranged at an upper and lower interval, and the first through hole and the second through hole are respectively opened on opposite sides of the oil cylinder along the horizontal direction.

5. The discharge model for simulating bubbles in transformer oil according to claim 4, wherein A high-voltage bushing is sleeved on the high-voltage lead, and the high-voltage bushing is vertically penetrated through the cylinder wall of the insulating oil cylinder.

6. The discharge model for simulating bubbles in transformer oil according to any one of claims 1 to 5, characterized in that, Both the high-voltage electrode and the low-voltage electrode are spherical electrodes.

7. The discharge model for simulating bubbles in transformer oil according to any one of claims 1 to 5, characterized in that, The discharge model for simulating bubbles in transformer oil further includes a temperature component, the temperature component is arranged inside the sealed cavity, the temperature component includes a heating device and a thermometer, the heating device is used for heating the insulating oil, and the thermometer is used for measuring the temperature of the insulating oil.

8. The discharge model for simulating bubbles in transformer oil according to any one of claims 1 to 5, characterized in that, The oil cylinder is an acrylic oil cylinder.

9. The discharge model for simulating bubbles in transformer oil according to any one of claims 1 to 5, characterized in that, The insulating oil is mineral oil or vegetable oil.

10. The discharge model for simulating bubbles in transformer oil according to any one of claims 1 to 5, characterized in that, A flow meter is arranged on the circulation pipe.

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