Simulation experiment device for discharge of suspended water drops in flowing transformer oil

Abstract

The utility model discloses a discharge simulation experiment device for suspended water drops in flowing transformer oil, which comprises a frame, a discharge oil storage tank, a sampling oil drum, an oil duct, a flange, a stainless steel flange type corrugated pipe, a float flowmeter and an oil pump, the discharge oil storage tank is an acrylic rectangular sealed cavity, and two ends of the discharge oil storage tank are respectively connected with an oil tank oil inlet and an oil tank oil outlet; an oil outlet of the oil tank is connected with an oil duct, the oil duct, a stainless steel flange type corrugated pipe and a float flowmeter are connected through flanges, the float flowmeter is connected with an oil pump, the oil pump is connected to an oil inlet of a sampling oil drum through a reducing joint and a reducing ball valve, and the oil inlet of the sampling oil drum is connected with an oil outlet of the sampling oil drum through a built-in oil circulating pipeline. An oil outlet of the sampling oil drum, the variable-diameter ball valve and the oil duct are connected through flanges and connected with an oil inlet of the oil groove, and the device can simulate different oil flow speeds in actual working conditions and research micro-water-containing partial discharge characteristics or insulation breakdown characteristics of transformer oil and the discharge theory.

Description

Technical Field

[0001] The utility model relates to the technical field of partial discharge test equipment for transformer oil, in particular to a simulation experimental device for discharge of suspended moving water droplets in flowing transformer oil. Background Art

[0002] As one of the important and expensive equipment constituting the power grid, power transformers play an important role in the stable operation of the power grid. In extreme environments where the temperature suddenly changes greatly, the accidents of oil-paper insulated power transformers (especially lightly loaded transformers) increase significantly compared with normal weather. Whenever an oil insulation fault occurs, it is found through the analysis of the oil quality that the water content in the oil is very high. The insulating paper molecular structure of oil-paper insulated transformers contains hydrocarbon groups, and its macroscopic structure is porous, making it extremely easy to absorb moisture. Moreover, the main mechanism for the invasion of moisture in the air is the internal and external pressure gradient. In areas with large temperature differences, due to the internal and external pressure gradient differences caused by frequent day-night temperature differences, moisture in the air continuously invades. To ensure the safe operation of power transformer equipment, it is necessary to study the reasons for the decline in oil insulation performance caused by the suspended moving water droplets precipitated in the flowing state of the insulating oil in transformers in areas with large temperature differences, and it is necessary to study the movement state, movement characteristics and influencing factors of the suspended moving water droplets in the oil ducts of transformers. In the prior art, there are few experimental devices that can detect the discharge of suspended moving water droplets in oil ducts. Content of the Utility Model

[0003] Aiming at the deficiencies of the prior art, the utility model solves the problem that the existing experimental device for flowing transformer oil cannot detect the movement state, movement characteristics and discharge conditions of suspended moving water droplets in the oil duct.

[0004] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0005] A simulation experimental device for discharge of suspended moving water droplets in flowing transformer oil, comprising a frame, a discharge oil storage tank, a sampling oil barrel, an oil duct, a flange, a stainless steel flange type bellows, a rotameter, and an oil pump. The discharge oil storage tank is an acrylic rectangular sealed cavity, and is respectively connected with an oil tank oil inlet and an oil tank oil outlet at both ends; the oil tank oil outlet is connected with the oil duct, and the oil duct, the stainless steel flange type bellows and the rotameter are connected through flanges. The rotameter is connected with the oil pump, and the oil pump is connected with the sampling oil barrel oil inlet of the sampling oil barrel through a reducing joint. The sampling oil barrel oil inlet is connected with the sampling oil barrel oil outlet through an internal oil circulation pipeline. The sampling oil barrel oil outlet, a reducing ball valve II and the oil duct are connected through flanges and are connected with the oil tank oil inlet; the discharge oil storage tank is fixed on the upper part of the frame through a base plate.

[0006] The discharge oil storage tank is provided with a pair of parallel baffles, a spring safety valve, a shock-resistant pressure gauge, and a pressure relief valve at the top. Inside the discharge oil storage tank, there are high-potential pure copper plates and low-potential pure copper plates that are parallel to each other. The two plates are respectively connected to a high-potential pure copper electrode rod and a low-potential pure copper electrode rod. A detachable spherical shielding cover is installed at the top of the high-potential pure copper electrode rod.

[0007] Preferably, a 120° inclined deflector is provided at the oil inlet and outlet of the discharge oil storage tank to effectively prevent turbulence at the four corners.

[0008] Preferably, a filling port is opened at the top of the sampling oil barrel, a sampling valve is opened at the bottom, and an electric heating rod temperature and sensor are installed inside the sampling oil barrel.

[0009] Preferably, the oil pump is fixed on the frame through a base, is a two-way circulation magnetic pump, and a ball valve is controlled at the inlet of the oil pump.

[0010] Preferably, the syringe is filled with pure water and is inserted into a water injection thin tube. The water injection thin tube is connected to the small holes at the lower part of the built-in oil circulation pipeline, and the number of water droplets in the flowing variable-pressure oil can be controlled.

[0011] The beneficial effects of the present utility model are as follows:

[0012] (1) A simulation experimental device for the discharge of suspended water droplets in flowing transformer oil proposed by the present utility model can study the partial discharge characteristics or insulation breakdown characteristics of transformer oil containing micro water, and supplement the discharge theory in transformer oil containing suspended water droplets.

[0013] (2) The two-way pump can change the flow direction and flow rate of the transformer oil, and simulate the deformation effect of different oil flow rates on the droplets in the actual working conditions. Description of the Drawings

[0014] Figure 1 It is a schematic structural diagram of a simulation experimental device for the discharge of suspended water droplets in flowing transformer oil proposed by the present utility model;

[0015] Figure 2 It is a front view of a simulation experimental device for the discharge of suspended water droplets in flowing transformer oil proposed by the present utility model;

[0016] In the figure: 1. Frame; 2. Discharge oil storage tank; 3. Sampling oil barrel; 4. Oil duct; 5. Flange; 6. Stainless steel flanged bellows; 7. Rotameter; 8. Oil pump; 9. Ball valve; 10. Reducing joint; 11. Reducing ball valve I; 12. Sampling oil barrel inlet; 13. Built-in circulation pipeline; 14. Sampling oil barrel outlet; 15. Reducing ball valve II; 16. Oil tank inlet; 17. Oil tank outlet; 18. Spring safety valve; 19. Shock-resistant pressure gauge; 20. Substrate; 21. Pressure relief valve; 22. Baffle; 23. High-potential pure copper electrode rod; 24. Low-potential pure copper electrode rod; 25. High-potential pure copper electrode plate; 26. Low-potential pure copper electrode plate; 27. Spherical shielding cover; 28. Oil filling port; 29. Sampling valve; 30. Electric heating rod; 31. Temperature sensor; 32. Base; 33. Deflector; 34. Syringe; 35. Fine water injection pipe. Detailed implementation mode

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0018] Refer to Figure 1 、 Figure 2 , a simulation experiment device for suspended water droplet discharge in flowing transformer oil, including a frame 1, a discharge oil storage tank 2, a sampling oil barrel 3, an oil duct 4, a flange 5, a stainless steel flanged bellows 6, a rotameter 7, and an oil pump 8.

[0019] The discharge oil storage tank 2 is an acrylic rectangular sealed cavity, and is respectively connected to an oil tank inlet 16 and an oil tank outlet 17 at both ends; the oil tank outlet 17 is connected to the oil duct 4; the oil duct 4, the stainless steel flanged bellows 6, and the rotameter 7 are connected through the flange 5, the rotameter 7 is connected to the oil pump 8, the oil pump 8 is connected to the sampling oil barrel inlet 12 of the sampling oil barrel 3 through a reducing joint 10, the sampling oil barrel inlet 12 is connected to the sampling oil barrel outlet 14 through the built-in oil circulation pipeline 13 of the sampling oil barrel 3, the sampling oil barrel outlet 14, the reducing ball valve II 15, and the oil duct 4 are connected through the flange 5 and are connected to the oil tank inlet 16; the discharge oil storage tank 2 is fixed on the upper part of the frame 1 through a substrate 20.

[0020] A pair of parallel baffles 22 are provided at the top of the discharge oil storage tank 2, and a spring safety valve 18, a shock-resistant pressure gauge 19, and a pressure relief valve 21 are also provided; a high-potential pure copper electrode plate 25 and a low-potential pure copper electrode plate 26 are arranged in parallel in the discharge oil storage tank 2, and the two electrode plates are respectively connected to a high-potential pure copper electrode rod 23 and a low-potential pure copper electrode rod 24; a detachable spherical shielding cover 27 is installed at the top of the high-potential pure copper electrode rod 23.

[0021] A deflector plate 33 with an inclination angle of 120° is provided at the oil outlet and inlet of the discharge oil storage tank 2 to effectively prevent turbulence at the four corners.

[0022] An oil filling port 28 is opened at the top of the sampling oil barrel 3, and a sampling valve 29 is opened at the bottom. An electric heating rod 30 and a temperature sensor 31 are provided inside the sampling oil barrel 3.

[0023] The oil pump 8 is fixed on the frame 1 through a base 32 and is a two-way circulation magnetic pump. A ball valve 9 controls the inlet of the oil pump 8.

[0024] The syringe 34 is filled with pure water and is inserted into the water injection thin tube 35. The water injection thin tube 35 is connected to a small hole at the lower part of the built-in oil circulation pipeline 13, and the number of water droplets in the flowing variable-pressure oil can be controlled.

[0025] This device can study the partial discharge characteristics or insulation breakdown characteristics of transformer oil containing micro water, and supplement the discharge theory in transformer oil containing suspended water droplets. The two-way pump can change the flow direction and flow rate of the transformer oil, and simulate the deformation effect of different oil flow rates on the droplets in the actual working conditions.

[0026] The above shows and describes the basic principles, main features and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A simulation experimental device for suspended water drop discharge in flowing transformer oil, characterized in that: It comprises a frame (1), a discharge oil storage tank (2), a sampling oil barrel (3), an oil channel (4), a flange (5), a stainless steel flange type bellows (6), a float flowmeter (7), and an oil pump (8); The discharge oil storage tank (2) is an acrylic rectangular sealed cavity, with two ends respectively connected to the oil tank oil inlet (16) and the oil tank oil outlet (17); the oil tank oil outlet (17) is connected to the oil channel (4), and the oil channel (4), the stainless steel flange type bellows (6), and the float flowmeter (7) are connected through a flange (5); the float flowmeter (7) is connected to the oil pump (8), and the oil pump (8) is connected to the sampling oil barrel oil inlet (12) of the sampling oil barrel (3) through a reducing joint (10) and a reducing ball valve (11); the sampling oil barrel oil inlet (12) is connected to the sampling oil barrel oil outlet (14) through a built-in oil circulation pipeline (13); the sampling oil barrel oil outlet (14), the reducing ball valve (15), and the oil channel (4) are connected through a flange (5) and connected to the oil tank oil inlet (16); The discharge oil storage tank (2) is fixed to the upper part of the frame (1) through a base plate (20); The discharge oil storage tank (2) is provided with a pair of parallel baffles (22) at the top, and is also provided with a spring-type safety valve (18), a shock-resistant pressure gauge (19), and a pressure relief valve (21); the discharge oil storage tank (2) is internally provided with two mutually parallel electrode plates, namely a high-potential pure copper electrode plate (25) and a low-potential pure copper electrode plate (26), the two electrode plates are respectively connected to a high-potential pure copper electrode rod (23) and a low-potential pure copper electrode rod (24); a detachable spherical shielding cover (27) is installed on the top of the high-potential pure copper electrode rod (23).

2. The suspended water drop discharge simulation experimental device in flow transformer oil according to claim 1 is characterized in that: A guide plate (33) with an inclined angle of 120° is provided at the oil inlet and outlet of the discharge oil storage tank (2) to prevent turbulence from occurring at the four corners.

3. The suspended water drop discharge simulation experimental device in flow transformer oil according to claim 1 is characterized in that: The sampling oil barrel (3) is provided with an oil filling port (28) at the top and a sampling valve (29) at the bottom. The sampling oil barrel (3) is provided with an electric heating rod (30) and a temperature sensor (31) therein.

4. The suspended water drop discharge simulation experimental device in flow transformer oil according to claim 1 is characterized in that: The oil pump (8) is fixed on the frame (1) via a base (32) and is a bidirectional circulation magnetic pump. A ball valve (9) is provided at the inlet of the oil pump (8) for control.

5. The suspended water drop discharge simulation experimental device in flow transformer oil according to claim 1 is characterized in that: The syringe (34) is filled with pure water and plugged into the water injection tube (35) of the sampling oil barrel (3). The water injection tube (35) is connected to the small hole at the bottom of the built-in oil circulation pipeline (13) to control the number of water drops in the flowing transformer oil.

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