Simulation device for simulating non-uniform aging of insulating oil paper of transformer

Abstract

The utility model relates to a simulation device for simulating non-uniform aging of insulating oil paper of a transformer. The simulation device comprises an aging tank, a heating device, a circulating pipe and an air supply device, the aging tank is internally provided with a tank cavity for accommodating insulating oil and insulating oil paper, the side wall of the aging tank is provided with an oil outlet and an oil inlet which are communicated with the tank cavity, the position of the oil outlet is higher than that of the oil inlet, and the top of the aging tank is provided with a sampling port communicated with the tank cavity; the heating device is arranged in the tank cavity and is used for heating the insulating oil; the circulating pipe is located outside the aging tank, one end of the circulating pipe is connected with the oil inlet, the other end of the circulating pipe is connected with the oil outlet, and the circulating pipe comprises a spiral pipe section in a spiral shape; and the cooling structure can exchange heat with the insulating oil in the spiral pipe section so as to cool the insulating oil in the spiral pipe section.

Description

Technical Field

[0001] The present disclosure relates to the technical field of transformer insulation aging simulation experiments, and in particular to a simulation device for simulating non-uniform aging of transformer insulation oil paper. Background Art

[0002] With the continuous development of modern society, it is necessary to develop ultra-high voltage long-distance power transmission. Transformers have become more important in power systems. Therefore, the evaluation of transformer insulation aging status should be paid more attention, especially the non-uniform aging of transformer insulation oil paper. When the oil temperature of the transformer is too high, it will accelerate the aging of the winding insulation oil paper, shorten the remaining life and increase the operating cost of the power company. Transformer oil (insulating oil) circulation cooling can effectively reduce the temperature of the transformer oil, prevent the transformer from overheating, and maintain an appropriate operating temperature. Therefore, it is very important to simulate the more efficient oil circulation cooling when the transformer insulation oil paper is non-uniformly aging.

[0003] However, the current simulation device for simulating the non-uniform aging oil circulation of transformer insulating oil paper is natural oil circulation cooling or forced oil circulation cooling with a straight oil pipe. When the heating power is high, the current simulation device cannot cool the transformer oil in time, and the insulating oil paper cannot be within an appropriate temperature range, which leads to inaccurate simulation results for the non-uniform aging of the insulating oil paper. Utility Model Content

[0004] The purpose of the present disclosure is to provide a simulation device for simulating non-uniform aging of transformer insulating oil paper, which can meet the cooling demand for insulating oil when the heating power is high.

[0005] In order to achieve the above-mentioned purpose, the present disclosure provides a simulation device for simulating the non-uniform aging of transformer insulating oil paper, the simulation device comprising an aging tank, a heating device, a circulation pipe and a cooling device; the aging tank has a tank cavity for accommodating insulating oil and insulating oil paper inside, the side wall of the aging tank is provided with an oil outlet and an oil inlet connected to the tank cavity, the position of the oil outlet is higher than the position of the oil inlet, and the top of the aging tank is provided with a sampling port connected to the tank cavity; the heating device is arranged in the tank cavity and is used to heat the insulating oil; the circulation pipe is located outside the aging tank, one end of the circulation pipe is connected to the oil inlet, and the other end is connected to the oil outlet, and the circulation pipe comprises a spiral pipe section formed in a spiral shape; the cooling device can exchange heat with the insulating oil in the spiral pipe section to cool the insulating oil in the spiral pipe section.

[0006] Optionally, the cooling device is an air supply device, and the air supply device is used to blow air toward the spiral pipe segment.

[0007] Optionally, the air supply device includes a fan and an air guide cover, the spiral pipe segment is located inside the air guide cover, the air guide cover has an air inlet and an air outlet, the air inlet and the air outlet are relatively arranged in a direction perpendicular to the extension direction of the spiral pipe segment, and the fan is fixed at the air inlet of the air guide cover.

[0008] Optionally, the air guide cover is conical, and the cross-sectional area of ​​the air guide cover gradually decreases from the air inlet to the air outlet.

[0009] Optionally, the air supply device includes an air supply pipe and a fan, the air supply pipe is connected to the fan, the spiral pipe section is arranged around the axis of the air supply pipe and outside the air supply pipe, and a plurality of air outlet holes are opened on the air supply pipe.

[0010] Optionally, a plurality of heat dissipation fins are fixed on the outer wall of the spiral tube segment.

[0011] Optionally, the simulation device also includes an oil pump and a switching valve, the circulating pipe also includes an oil outlet pipe section and an oil return pipe section, the oil outlet pipe is connected between the oil outlet and the spiral pipe section, the oil return pipe section is connected between the oil inlet and the spiral pipe section, the switching valve is arranged on the oil outlet pipe section, and the oil pump is arranged on the oil return pipe section.

[0012] Optionally, a temperature sensor is provided in the tank cavity, and the temperature sensor is arranged close to the top of the aging tank and is used to detect the temperature of the insulating oil in the tank cavity.

[0013] Optionally, the simulation device further includes a controller, and the temperature sensor, the oil pump, the heating device and the cooling device are all electrically connected to the controller.

[0014] Optionally, the heating device comprises a plurality of heating rods, and the plurality of heating rods are sequentially spaced from top to bottom.

[0015] Through the above technical scheme, by setting up an aging tank, the oil tank of the transformer can be simulated, and by using a heating device, the heating condition of the transformer under different powers in actual use can be simulated, thereby heating the insulating oil to different temperatures to meet different experimental powers. By setting up a circulation pipe and a cooling device, the external circulation mode of the transformer can be simulated. When the cooling device is not started, a naturally cooled transformer can be simulated, and when the cooling device is started, a forced cooling transformer can be simulated. The circulation pipe includes a spiral pipe section, which has a longer flow guide length compared to a circulation pipe composed entirely of straight pipes, so that the transformer oil can obtain a larger heat exchange area in the circulation pipe section, thereby improving the heat exchange efficiency of the transformer oil at the circulation pipe section, so that the simulation device can cool the transformer oil after passing through the circulation pipe to a suitable temperature range when the heating power is high, thereby improving the accuracy of the simulation results of the non-uniform aging of the insulating oil paper.

[0016] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0018] Figure 1 is a schematic structural diagram of a simulation device provided by an exemplary embodiment of the present disclosure, wherein a cooling device is not shown;

[0019] Figure 2 yes Figure 1 A schematic diagram of a partial cross-sectional structure of a simulation device;

[0020] Figure 3 is a schematic structural diagram of a simulation device provided by an exemplary embodiment of the present disclosure;

[0021] Figure 4 yes Figure 3 A top view of

[0022] Figure 5 is a structural schematic diagram of a simulation device provided by another exemplary embodiment of the present disclosure;

[0023] Figure 6 It is the control schematic diagram of the controller.

[0024] Description of Reference Numerals

[0025] 100-aging tank; 101-tank cavity; 102-tank body; 103-cover body; 110-oil outlet; 120-oil inlet; 130-sampling port; 140-cover;

[0026] 200-heating device; 210-heating rod; 220-fixing member;

[0027] 300-circulation pipe; 310-oil outlet pipe section; 311-switch valve; 320-spiral pipe section; 321-fin; 330-oil return pipe section;

[0028] 400-air supply device; 410-fan; 420-air guide cover; 421-air inlet; 430-air supply pipe; 431-air outlet; 440-fan; 450-connector;

[0029] 500-Oil pump;

[0030] 600-temperature sensor;

[0031] 700-Controller. DETAILED DESCRIPTION

[0032] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0033] In the description of the present disclosure, it should be understood that the terms "upper", "lower", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, and a specific orientation structure and operation, and therefore cannot be understood as a limitation of the present disclosure. In addition, the terms "inside and outside" refer to the inside and outside of the corresponding structural contour. In addition, the terms "first", "second", etc. are only used to distinguish one element from another element, and do not have order and importance.

[0034] In the description of the present disclosure, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connect", "connected", and "installed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0035] In order to solve the problem that the simulation results of non-uniform aging of insulating oil paper in current simulation devices are inaccurate when the experimental power is high, the present disclosure provides a simulation device for simulating non-uniform aging of transformer insulating oil paper.

[0036] like Figures 1 to 6As shown, the simulation device includes an aging tank 100, a heating device 200, a circulation pipe 300 and a cooling device; the aging tank 100 has a tank cavity 101 for accommodating insulating oil and insulating oil paper, the side wall of the aging tank 100 is provided with an oil outlet 110 and an oil inlet 120 connected to the tank cavity 101, the position of the oil outlet 110 is higher than the position of the oil inlet 120, and the top of the aging tank 100 is provided with a sampling port 130 connected to the tank cavity 101; the heating device 200 is arranged in the tank cavity 101 and is used to heat the insulating oil; the circulation pipe 300 is located outside the aging tank 100, one end of the circulation pipe 300 is connected to the oil inlet 120, and the other end is connected to the oil outlet 110, and the circulation pipe 300 includes a spiral pipe section 320 formed in a spiral shape; the cooling device can exchange heat with the insulating oil in the spiral pipe section 320 to cool the insulating oil in the spiral pipe.

[0037] In the above scheme, by setting the aging tank 100, the oil tank of the transformer can be simulated, and by the heating device 200, the heating condition of the transformer under different powers in actual use can be simulated, and the insulating oil can be heated to different temperatures to meet different experimental powers. By setting the circulation pipe 300 and the cooling device, the external circulation mode of the transformer can be simulated. When the cooling device is not started, the natural cooling type transformer can be simulated, and when the cooling device is started, the forced cooling type transformer can be simulated. The circulation pipe 300 includes a spiral pipe section 320. Compared with the circulation pipe composed entirely of straight pipes, the spiral pipe section 320 has a longer flow guide length, so that the transformer oil can obtain a larger heat exchange area in the circulation pipe part, thereby improving the heat exchange efficiency of the transformer oil at the circulation pipe section 300, so that the simulation device can cool the transformer oil after passing through the circulation pipe 300 to a suitable temperature range when the heating power is high, thereby improving the accuracy of the simulation results of the non-uniform aging of the insulating oil paper.

[0038] In addition, the circulation pipe 300 includes a spiral pipe section 320, so that the simulation device can also achieve the following effects:

[0039] 1. By providing the spiral pipe section 320 , a spiral oil flow path can be formed, which helps to enhance the flow of the insulating oil in the spiral pipe section 320 , thereby increasing the circulation speed of the insulating oil, increasing the power of the insulating oil, and improving the cooling efficiency of the insulating oil in the aging tank 100 .

[0040] 2. By providing the spiral pipe section 320, the resistance of the oil flow can be reduced and the energy consumption of the system can be reduced.

[0041] 3. The spiral pipe section 320 can be provided to reduce turbulence in the oil flow, prevent oil fluctuations, and improve system stability.

[0042] 4. Providing the spiral pipe section 320 can help prevent the formation of bubbles in the oil, reduce potential gas dissolution problems, and help maintain the insulation performance of the oil.

[0043] 5. The spiral pipe section 320 is provided so that the circulation pipe 300 occupies less space while meeting the cooling demand, thereby reducing the volume of the entire simulation device, and the simulation device can operate in a limited space.

[0044] It should be noted that the aging degree of the insulating oil paper can be obtained by testing the polymerization degree of the insulating oil paper, or by testing the content of components dissolved in the insulating oil of the insulating oil paper, and the present disclosure does not make specific restrictions on this.

[0045] In some embodiments, the cooling device is an air supply device 400 , and the air supply device 400 is used to blow air toward the spiral pipe segment 320 .

[0046] By using the air supply device 400 to blow air toward the spiral pipe section 320 , the cooling system of a forced air-cooled transformer can be simulated to obtain more realistic aging data of the insulating oil paper.

[0047] Of course, in other embodiments, the cooling device may also adopt a liquid cooling structure to cool the circulation pipe 300 using a coolant.

[0048] Regarding the placement structure of the insulating oil paper in the tank cavity 101, in some optional implementations, such as Figure 2 As shown, a fixing member 220 is fixed to the cavity wall of the tank cavity 101 , and the insulating oil paper can be placed on the fixing member 220 .

[0049] In some optional embodiments, a sampling port 130 is provided on the top of the aging tank 100, the sampling port 130 is communicated with the tank cavity 101, and a cover 140 is provided on the sampling port 130. When it is necessary to sample the insulating oil in the tank cavity 101, the cover 140 can be removed and the sampling port 130 can be sampled. When sampling is not required, the cover 140 is placed on the sampling port 130.

[0050] Regarding the specific structure of the air supply device 400, the present disclosure provides the following Figure 3 and Figure 4 In the embodiment shown, the air supply device 400 includes a fan 410 and an air guide cover 420, the spiral pipe segment 320 is located in the air guide cover 420, the air guide cover 420 has an air inlet 421 and an air outlet, the air inlet 421 and the air outlet are relatively arranged in a direction perpendicular to the extension direction of the spiral pipe segment 320, and the fan 410 is fixed at the air inlet 421 of the air guide cover 420.

[0051] The provision of the wind guide cover 420 can concentrate the wind blown out by the fan 410 in the wind guide cover 420, so that the wind can act more on the spiral pipe segment 320, quickly taking away the heat on the surface of the spiral pipe segment 320, so that the insulating oil flowing through the spiral pipe segment 320 can obtain a better cooling effect, thereby enabling the simulation device to operate normally at a higher power.

[0052] In some optional implementations, the air guide cover 420 is fixed to the aging tank 100 via a connector 450 .

[0053] In some optional embodiments, such as Figure 4 As shown, the air guide cover 420 is conical, and the cross-sectional area of ​​the air guide cover 420 gradually decreases from the air inlet 421 to the air outlet.

[0054] By setting the air guide cover 420 to be conical, and the cross-sectional area of ​​the air guide cover 420 gradually decreases from the air inlet 421 to the air outlet, the wind blown into the air guide cover 420 by the fan 410 can be continuously accelerated, and then the heat on the surface of the spiral pipe section 320 can be quickly taken away, the heat exchange efficiency of the spiral pipe section 320 is improved, and the cooling effect of the insulating oil flowing through the spiral pipe section 320 is further improved, so that the simulation device can operate normally at a higher power.

[0055] Regarding the specific structure of the air supply device 400, the present disclosure also provides the following Figure 5 In the embodiment shown, the air supply device 400 includes an air supply pipe 430 and a fan 440, the air supply pipe 430 is connected to the fan 440, the spiral pipe section 320 is arranged around the axis of the air supply pipe 430 and on the outside of the air supply pipe 430, and a plurality of air outlet holes 431 are opened on the air supply pipe 430.

[0056] By winding the spiral pipe section 320 around the outside of the air supply pipe 430, the spiral pipe section 320 can contact with the air supply pipe 430 and dissipate heat. At the same time, the wind blown by the fan 440 can quickly take away the heat of the wall of the air supply pipe 430 when flowing through the air supply pipe 430, thereby allowing the spiral pipe section 320 to cool down quickly. At the same time, the air outlet 431 opened on the air supply pipe 430 can also allow part of the air to be blown out from the air outlet 431 and act on the part of the spiral pipe section 320 that is not in contact with the air supply pipe 430, and then the insulating oil flowing through the spiral pipe section 320 can obtain a better cooling effect, so that the simulation device can operate normally at a higher power.

[0057] The present disclosure further optimizes the design of the spiral pipe section 320 so that the insulating oil has a better cooling effect when flowing through the spiral pipe section 320. In some optional embodiments, a plurality of heat dissipation fins 321 are fixed on the outer wall of the spiral pipe section 320. The fins 321 fixed on the outer wall of the spiral pipe section 320 can increase the heat exchange area of ​​the spiral pipe section 320 to obtain a better cooling effect on the insulating oil.

[0058] In some optional embodiments, the simulation device also includes an oil pump 500 and a switching valve 311, the circulation pipe 300 also includes an oil outlet pipe section and an oil return pipe section 330, the oil outlet pipe is connected between the oil outlet 110 and the spiral pipe section 320, the oil return pipe section 330 is connected between the oil inlet 120 and the spiral pipe section 320, the switching valve 311 is arranged on the oil outlet pipe section 310, and the oil pump 500 is arranged on the oil return pipe section 330.

[0059] By providing the oil pump 500, the circulation efficiency of the insulating oil in the aging tank 100 can be accelerated, thereby improving the cooling efficiency of the insulating oil in the aging tank 100. At the same time, since the oil pump 500 is provided on the oil return pipe section 330, the insulating oil flowing through the oil pump 500 will first pass through the oil outlet pipe section 310 and the spiral pipe section 320 for cooling, so that the damage of the components in the oil pump 500 by the high-temperature insulating oil can be effectively avoided, so as to improve the service life of the oil pump 500. The switch valve 311 is provided on the oil outlet pipe section 310, and when the switch valve 311 is closed, the insulating oil can be prevented from entering the spiral pipe section 320.

[0060] In some optional embodiments, the extension direction of the spiral pipe section 320 is the vertical direction. This arrangement allows the insulating oil to be accelerated by its own gravity when entering the spiral pipe section 320, and the spiral oil flow path formed by the spiral pipe section 320 can further increase the fluid velocity of the insulating oil. At the same time, since the hot air exchanged by the spiral pipe section 320 will rise upward, the air around the spiral pipe section 320 can flow upward, so that the entire spiral pipe section 320 is located within the flow range of the air, thereby improving the heat dissipation effect of the spiral pipe section 320.

[0061] In some optional embodiments, a temperature sensor 600 is disposed in the tank cavity 101 . The temperature sensor 600 is disposed close to the top of the aging tank 100 and is used to detect the temperature of the insulating oil in the tank cavity 101 .

[0062] The temperature sensor 600 can detect the temperature of the insulating oil. In addition, since the aging efficiency of the insulating oil paper is directly related to the oil temperature of the insulating oil, the higher the oil temperature, the faster the insulating oil paper ages, and the high-temperature oil will flow upward. Therefore, by setting the temperature sensor 600 at the top of the aging tank 100, the highest insulating oil temperature in the aging tank 100 can be obtained.

[0063] In some optional embodiments, the simulation device further includes a controller 700 , and the temperature sensor 600 , the oil pump 500 , the heating device 200 , and the cooling device are all electrically connected to the controller 700 .

[0064] The controller 700 is provided to enable the temperature sensor 600, the oil pump 500, the heating device 200 and the cooling device to be linked. The controller 700 can control the heating efficiency of the heating device 200 according to the simulation requirements, and obtain the current experimental efficiency in real time through the temperature information obtained by the temperature sensor 600, and thereby control the power of the oil pump 500 and the cooling efficiency of the cooling device in real time, so that the insulating oil in the simulation device can always obtain sufficient heat dissipation, thereby making the aging data of the insulating oil paper in the simulation device more accurate.

[0065] In some optional embodiments, the heating device 200 includes a plurality of heating rods 210 , and the plurality of heating rods 210 are sequentially spaced from top to bottom.

[0066] A plurality of heating rods 210 are arranged at intervals from top to bottom, so as to heat the insulating oil in different height areas in the aging tank 100, so that the heating device 200 can simulate the heating of the transformer more realistically.

[0067] In some optional embodiments, the heating temperature of the heating rod 210 decreases successively from top to bottom. With this arrangement, the insulating oil in the aging tank 100 has a more obvious aging difference, thereby improving the effect of non-uniform aging of the insulating paper.

[0068] In some optional embodiments, the aging tank 100 includes a tank body 102 and a cover body 103. The tank body 102 is open at the top and forms a tank cavity 101 inside the tank body 102. The cover body 103 is covered at the opening of the tank body 102. Opening the cover body 103 can facilitate cleaning of the tank cavity 101 and replacement of insulating oil paper.

[0069] When the aging tank 100 includes a tank body 102 and a cover body 103 , the heating rod 210 and the fixing member 220 are both disposed on the tank body 102 . The sampling port 130 is disposed on the cover 140 .

[0070] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0071] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0072] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A simulation device for simulating non-uniform aging of transformer insulating oil paper, characterized in that: include: An aging tank having a tank cavity for accommodating insulating oil and insulating oil paper, an oil outlet and an oil inlet communicating with the tank cavity are arranged on the side wall of the aging tank, the oil outlet is located higher than the oil inlet, and a sampling port communicating with the tank cavity is arranged on the top of the aging tank; A heating device, disposed in the tank cavity and used for heating the insulating oil; A circulation pipe is located outside the aging tank, one end of the circulation pipe is connected to the oil inlet, and the other end is connected to the oil outlet, and the circulation pipe includes a spiral pipe section forming a spiral shape; The cooling device can exchange heat with the insulating oil in the spiral pipe section to cool the insulating oil in the spiral pipe section.

2. The simulation device according to claim 1, characterized in that The cooling device is an air supply device, and the air supply device is used to blow air toward the spiral pipe segment.

3. The simulation device according to claim 2, characterized in that The air supply device includes a fan and an air guide cover, the spiral pipe section is located in the air guide cover, the air guide cover has an air inlet and an air outlet, the air inlet and the air outlet are relatively arranged in a direction perpendicular to the extension direction of the spiral pipe section, and the fan is fixed at the air inlet of the air guide cover.

4. The simulation device according to claim 3, characterized in that The air guide cover is conical, and the cross-sectional area of ​​the air guide cover gradually decreases from the air inlet to the air outlet.

5. The simulation device according to claim 2, characterized in that: The air supply device comprises an air supply pipe and a fan, the air supply pipe is connected to the fan, the spiral pipe section is arranged around the axis of the air supply pipe and outside the air supply pipe, and a plurality of air outlet holes are opened on the air supply pipe.

6. The simulation device according to any one of claims 1 to 5, characterized in that: A plurality of heat dissipation fins are fixed on the outer wall of the spiral tube section.

7. The simulation device according to any one of claims 1 to 5, characterized in that: The simulation device also includes an oil pump and a switching valve, and the circulation pipe also includes an oil outlet pipe section and an oil return pipe section, the oil outlet pipe section is connected between the oil outlet and the spiral pipe section, and the oil return pipe section is connected between the oil inlet and the spiral pipe section, the switching valve is arranged on the oil outlet pipe section, and the oil pump is arranged on the oil return pipe section.

8. The simulation device according to claim 7, characterized in that: A temperature sensor is arranged in the tank cavity. The temperature sensor is arranged close to the top of the aging tank and is used to detect the temperature of the insulating oil in the tank cavity.

9. The simulation device according to claim 8, characterized in that The simulation device also includes a controller, and the temperature sensor, the oil pump, the heating device and the cooling device are all electrically connected to the controller.

10. The simulation device according to any one of claims 1 to 5, characterized in that: The heating device comprises a plurality of heating rods, and the plurality of heating rods are sequentially arranged at intervals from top to bottom.

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