Transformer insulating oil dielectric strength testing device

Abstract

The utility model relates to a transformer insulating oil dielectric strength testing device, which comprises a detection box body, a detection unit, an oil discharge pipe, a return pipe, a mounting rack, a double-filter unit, a first branch pipe, a second branch pipe and a linkage type spherical valve group, the spherical valves are arranged at the ends, close to the oil discharging pipe, of the first branch pipe and the second branch pipe correspondingly, and the free ends of valve rods of the two spherical valves are fixedly connected to form a synchronous reverse movement mechanism. The backflow cavity is formed in the end, close to the backflow pipe, of the mounting frame and communicates with the bottoms of the first mounting cavity and the second mounting cavity; and the confluence interface is arranged at the tail end of the backflow cavity and communicated with the backflow pipe. By operating the synchronous reverse movement mechanism, alternate use and maintenance of the filter units are realized under the condition of not stopping operation of the device, and continuous operation of the device is ensured. And the problem that the test is interrupted when the filter screen of the detection device is replaced is effectively improved.

Description

Technical Field

[0001] This application relates to the technical field of transformer insulating oil testing, and in particular to a transformer insulating oil dielectric strength testing device. Background Technology

[0002] In large power grids, the safe and stable operation of power transformers is crucial, and transformer insulating oil, as a key component of transformers, directly affects the insulation performance and service life of the transformer. With the continuous expansion of power grid scale and the increase in voltage levels, the requirements for the accuracy and reliability of transformer insulating oil testing are also becoming increasingly stringent.

[0003] Transformer insulating oil plays a vital role in power systems, providing insulation and heat dissipation. Its dielectric strength is a key indicator for measuring its insulation performance. Accurately measuring the dielectric strength of transformer insulating oil is crucial for ensuring the safe and stable operation of transformers.

[0004] Chinese patent application CN202420563562.6 discloses a field testing device for transformer insulating oil breakdown voltage, comprising a testing box and support feet. The testing box contains a testing device and a filtering device. This field testing device detects the temperature of the insulating oil using a temperature sensor. When the oil temperature is too low, the electric heating wire inside the heating box is activated to heat the insulating oil inside the oil delivery pipe, thus preventing unstable oil temperature from affecting the test results. Mechanical vibration, partial discharge, and aging of the paper insulation during transformer operation generate a large number of solid impurity particles in the transformer oil, such as iron particles, copper particles, carbon particles, and fiber particles. Therefore, after the test is completed, the insulating oil is discharged through the drain pipe into the filter box, where the filter screen intercepts and filters out the solid particles inside the insulating oil, thereby increasing the service life of the insulating oil.

[0005] The aforementioned technologies have the following drawbacks: The testing devices primarily test the dielectric strength of the extracted insulating oil. For large power grid transformers, the insulating oil contains many impurities, which easily clog the filter screen. This affects the normal flow of the insulating oil, hindering the testing process and reducing testing efficiency. Furthermore, replacing the filter screen requires shutting down the machine, disconnecting the flow, and opening the sealed top cover, which not only interrupts the test but also easily causes secondary contamination of the insulating oil. Utility Model Content

[0006] To address the issue of test interruption caused by filter replacement in the aforementioned testing device, this application provides a transformer insulating oil dielectric strength testing device.

[0007] The transformer insulating oil dielectric strength testing device provided in this application adopts the following technical solution:

[0008] A transformer insulating oil dielectric strength testing device includes a testing box, which is equipped with a dielectric strength testing unit inside.

[0009] The oil drain pipe is connected to the right end of the detection tube of the dielectric strength detection unit;

[0010] The return pipe is located on the outside of the detection box and forms a circulation loop with the dielectric strength detection unit;

[0011] The mounting bracket is fixed between the oil drain pipe and the return pipe, and a first mounting cavity and a second mounting cavity are opened side by side along its vertical direction on the side facing the sealing door of the detection box.

[0012] The filter unit is provided in two and is detachably installed in the first mounting cavity and the second mounting cavity respectively. Each filter unit includes a filter box and a handle.

[0013] The first branch pipe and the second branch pipe are respectively connected to the oil drain pipe and the first mounting cavity and the second mounting cavity;

[0014] The linkage ball valve assembly consists of two ball valves arranged opposite each other. The ball valves are respectively located at the ends of the first branch pipe and the second branch pipe near the oil discharge pipe, and the free ends of the valve stems of the two ball valves are fixedly connected to form a synchronous reverse motion mechanism.

[0015] The reflux chamber is located at one end of the mounting bracket near the reflux pipe and is connected to the bottom of the first and second mounting chambers.

[0016] The manifold interface is located at the end of the return cavity and is connected to the return pipe.

[0017] Furthermore, both the inlet and outlet ends of the filter box are fitted with sealing rings, and the thickness of the sealing rings is greater than the installation gap between the filter box and the mounting bracket.

[0018] Furthermore, the inner walls of the first mounting cavity and the second mounting cavity are provided with annular grooves corresponding to the position of the sealing ring, and the sealing ring is interference-fitted into the annular grooves.

[0019] Furthermore, the top of the filter box is slidably provided with an elastic buckle, and the mounting bracket has a slot corresponding to the buckle for use with the buckle.

[0020] Furthermore, the buckle end is provided with a guide bevel, and a lever is fixed to the outside of the buckle, the surface of which is provided with an anti-slip structure.

[0021] Furthermore, a transparent observation window is provided on the top of the filter box.

[0022] Furthermore, a handle is fixedly connected to the valve stem connection of the two ball valves.

[0023] Furthermore, the location of the manifold is lower than the outlet end of the filter box located below.

[0024] In summary, the beneficial technical effects of this application are as follows:

[0025] 1. With dual filter units and a linked ball valve assembly, the filter units can be used and maintained alternately without stopping the operation of the device, avoiding test interruption caused by replacing the filter screen;

[0026] 2. The embedded sealing rings at the inlet and outlet of the filter box, together with the annular grooves on the inner wall of the mounting cavity, form a radial seal under pressure to prevent leakage of insulating oil;

[0027] 3. The elastic buckle on the top of the filter box, along with the guide bevel and lever, facilitates quick and easy disassembly and installation of the filter box and prevents it from loosening during use;

[0028] 4. The transparent observation window on the top of the filter box is made of oil-resistant material, allowing direct observation of the filter element's condition and oil quality, reducing unnecessary disassembly and inspection;

[0029] 5. The double ball valve achieves synchronous reverse opening and closing through a fixed handle, eliminating the risk of simultaneous on / off of the oil circuit due to misoperation. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the internal structure of the detection chamber according to an embodiment of this application;

[0031] Figure 2 This is a top view of the mounting bracket and filter unit according to an embodiment of this application;

[0032] Figure 3 It is along Figure 2 Schematic diagram of the cross-sectional structure along line AA;

[0033] Figure 4 yes Figure 2 Enlarged view of part B in the diagram

[0034] Figure 5 This is a front view structural diagram of this utility model.

[0035] Explanation of reference numerals in the attached figures:

[0036] 1. Inspect the enclosure; 11. Seal the door;

[0037] 2. Detection unit; 21. Detection tube; 211. Oil drain pipe;

[0038] 3. Return pipe;

[0039] 4. Mounting bracket; 41. First mounting cavity; 411. First branch pipe; 42. Second mounting cavity; 421. Second branch pipe; 43. Return cavity; 431. Manifold interface; 44. Annular groove; 45. Slot;

[0040] 5. Filter box; 51. Handle; 52. Sealing ring; 53. Buckle; 531. Paddle; 54. Observation window;

[0041] 6. Ball valve; 61. Handle. Detailed Implementation

[0042] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0043] This application discloses a device for testing the dielectric strength of transformer insulating oil. (Refer to...) Figures 1 to 5 It includes:

[0044] The test chamber 1 is equipped with a dielectric strength testing unit 2 for testing the dielectric strength of transformer insulating oil. The dielectric strength testing unit 2 is existing technology and can be fully implemented by those skilled in the art, so it will not be described in detail here.

[0045] The oil drain pipe 211 is connected to the right end of the detection pipe 21 of the dielectric strength detection unit 2 and is used to drain the tested insulating oil.

[0046] The return pipe 3 is located on the outside of the detection box 1 and forms a circulation loop with the dielectric strength detection unit 2.

[0047] Mounting bracket 4 is fixed between oil drain pipe 211 and return pipe 3. On the side facing the sealing door 11 of the detection box 1, a first mounting cavity 41 and a second mounting cavity 42 are opened side by side along its vertical direction.

[0048] The filter unit has two units, which are respectively detachably installed in the first mounting cavity 41 and the second mounting cavity 42. Each filter unit includes a filter box 5 and a handle 51 for easy operation of the filter box 5.

[0049] The first branch pipe 411 and the second branch pipe 421 are connected to the oil drain pipe 211 and the first mounting cavity 41, respectively, and are used to guide the insulating oil into the corresponding filter unit.

[0050] The linkage ball valve group 6 consists of two ball valves 6 arranged opposite each other. The ball valves 6 are respectively located at the ends of the first branch pipe 411 and the second branch pipe 421 near the oil drain pipe 211, and the free ends of the valve stems of the two ball valves 6 are fixedly connected to form a synchronous reverse motion mechanism, which can simultaneously control the opening and closing of the two pipes.

[0051] The return cavity 43 is located at one end of the mounting bracket 4 near the return pipe 3 and is connected to the bottom of the first mounting cavity 41 and the second mounting cavity 42.

[0052] The manifold 431 is located at the end of the return cavity 43 and is connected to the return pipe 3, so as to introduce the collected insulating oil into the return pipe 3.

[0053] In the initial state, the ball valve 6 on the first branch pipe 411 is open, and the ball valve 6 on the second branch pipe 421 is closed. At this time, the insulating oil flowing from the drain pipe 211 passes through the first branch pipe 411 and enters the filter unit in the first mounting cavity 41 for filtration and purification. The filtered insulating oil then flows into the return cavity 43 and into the return pipe 3. When the filter unit in the first mounting cavity 41 becomes clogged after a period of use, the ball valve 6 on the first branch pipe 411 can be closed and the ball valve 6 on the second branch pipe 421 opened by operating the synchronous reverse motion mechanism. This allows the insulating oil to pass through the second branch pipe 421 and enter the filter unit in the second mounting cavity 42 for filtration and purification, while the filter unit in the first mounting cavity 41 can be replaced or maintained. This switching method allows for the alternating use and maintenance of the filter units without stopping the device operation, ensuring continuous operation of the device. This effectively improves the problem of test interruption caused by filter replacement in the aforementioned testing device.

[0054] Specifically, refer to Figure 2 and Figure 3 Both the inlet and outlet ends of the filter box 5 are fitted with sealing rings 52. The sealing rings 52 are made of elastic, oil-resistant, and temperature-resistant materials. The embedded installation ensures the stability of the sealing rings 52 and prevents them from shifting. For the transformer insulating oil dielectric strength testing device, the flow of insulating oil at the inlet and outlet will generate a certain pressure. The embedded installation ensures that the sealing rings 52 are always in the correct position, maintaining a good sealing effect. The thickness of the sealing rings 52 is greater than the installation gap between the filter box 5 and the mounting bracket 4, allowing the sealing rings 52 to tightly fill the gap between the filter box 5 and the mounting bracket 4, preventing insulating oil leakage.

[0055] Furthermore, referring to Figure 2 and Figure 3An annular groove 44 is formed on the inner wall of the first mounting cavity 41 and the second mounting cavity 42 corresponding to the position of the sealing ring 52. The width of the groove is slightly larger than the cross-sectional diameter of the sealing ring 52, so that the sealing ring 52 can be smoothly embedded and the sealing effect will not be affected by excessive gap. The sealing ring 52 is interference-fitted into the annular groove 44 to form a radial seal.

[0056] When the filter box 5 is installed on the mounting bracket 4, the sealing ring 52 is subjected to radial pressure from the filter box 5 and the mounting bracket 4. This pressure causes the sealing ring 52 to undergo elastic deformation, tightly fitting against the inner wall of the annular groove 44 and the contact surface of the filter box 5 and the mounting bracket 4, thereby forming a radial seal and further improving the stability of the sealing effect.

[0057] Furthermore, referring to Figure 1 The top of the filter box 5 is equipped with a flexible buckle 53, which is made of a material with good elasticity and wear resistance. The mounting bracket 4 has a slot 45 for the buckle 53 to cooperate with it.

[0058] Thus, when the filter box 5 needs to be disassembled, the operator only needs to apply a certain external force to the elastic buckle 53 to cause it to deform elastically, and the buckle head can be disengaged from the slot 45, thereby achieving quick disassembly of the filter box 5. This disassembly method facilitates the cleaning, maintenance and replacement of the filter box 5; and, after the elastic buckle 53 is inserted into the slot 45, a certain pre-tightening force is generated due to the elastic effect, so that the buckle head and the slot 45 fit tightly together, preventing the filter box 5 from loosening due to vibration or other reasons during use.

[0059] Furthermore, referring to Figure 1 , Figure 2 and Figure 4 The end of the buckle 53 is provided with a guide slope (not shown in the figure), the slope angle of which is between 15° and 45°. The slope gradually narrows from the end of the buckle 53 toward the main body of the buckle 53, forming a guide structure. A lever 531 is fixedly connected to the outside of the buckle 53. The surface of the lever 531 is provided with an anti-slip structure, which can be an anti-slip protrusion or an anti-slip groove.

[0060] The guide ramp allows the clip 53 to quickly and accurately locate the slot 45, reducing adjustment time during installation. Simultaneously, the reduced installation resistance allows operators to more quickly insert the clip 53 into the slot 45, completing the installation of the filter box 5. The design of the lever 531 facilitates disassembly; operators can easily detach the clip 53 from the slot 45 with a gentle push of the lever 531, without the need for complex tools or excessive force. The anti-slip structure prevents accidental injury caused by slipping fingers during disassembly.

[0061] Furthermore, referring to Figure 1, Figure 2 and Figure 4 The top of the filter box 5 is provided with a transparent observation window 54. The transparent observation window 54 is made of a material with high transparency and good oil resistance, such as acrylic, so that the operator can understand the internal condition of the filter box 5 in real time without disassembling the filter box 5, just by looking through the observation window 54, which greatly saves time and effort.

[0062] At the same time, refer to Figure 1 A handle 61 is fixedly connected to the valve stem connection of the two ball valves 6. The design of the handle 61 makes it easier for the operator to turn the ball valves 6, thus improving the convenience of the testing device.

[0063] Additionally, refer to Figure 1 , Figure 2 and Figure 3 The position of the manifold 431 is lower than the outlet end of the filter box 5 located below, so that the insulating oil in the return cavity 43 can flow fully into the return pipe 3 and avoid it remaining in the return cavity 43.

[0064] The implementation principle of the transformer insulating oil dielectric strength testing device in this application is as follows:

[0065] Initially, the ball valve 6 on the first branch pipe 411 is open, and the ball valve 6 on the second branch pipe 421 is closed. At this time, the insulating oil flowing from the drain pipe 211 passes through the first branch pipe 411 and enters the filter unit in the first mounting cavity 41 for filtration and purification. The filtered insulating oil then flows into the return cavity 43 and into the return pipe 3. When the filter unit in the first mounting cavity 41 becomes clogged after a period of use, the ball valve 6 on the first branch pipe 411 can be closed and the ball valve 6 on the second branch pipe 421 opened by operating the synchronous reverse motion mechanism. In this way, the insulating oil will pass through the second branch pipe 421 and enter the filter unit in the second mounting cavity 42 for filtration and purification, while the filter unit in the first mounting cavity 41 can be replaced or maintained. This switching method allows for the alternating use and maintenance of the filter units without stopping the device operation, ensuring continuous operation of the device. This effectively improves the problem of test interruption caused by filter replacement in the aforementioned testing device.

[0066] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," "third," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "a" or "one," and similar terms, do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising," "including," and similar terms mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. "Above," "below," "left," "right," etc., are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly. The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A device for testing the dielectric strength of transformer insulating oil, characterized in that, include: The test chamber (1) is equipped with a dielectric strength testing unit (2) inside. The oil drain pipe (211) is connected to the right end of the detection pipe (21) of the dielectric strength detection unit (2); The return pipe (3) is located on the outside of the detection box (1) and forms a circulation loop with the dielectric strength detection unit (2); Mounting bracket (4) is fixed between the drain pipe (211) and the return pipe (3). On the side facing the sealing door (11) of the detection box (1), a first mounting cavity (41) and a second mounting cavity (42) are opened side by side along its vertical direction. The filter unit is provided in two and is detachably installed in the first mounting cavity (41) and the second mounting cavity (42) respectively. Each filter unit includes a filter box (5) and a handle (51). The first branch pipe (411) and the second branch pipe (421) are respectively connected to the oil drain pipe (211) and the first mounting cavity (41) and the second mounting cavity (42). The linkage ball valve (6) group consists of two ball valves (6) arranged opposite to each other. The ball valves (6) are respectively located at the ends of the first branch pipe (411) and the second branch pipe (421) near the oil drain pipe (211), and the free ends of the valve stems of the two ball valves (6) are fixedly connected to form a synchronous reverse motion mechanism. The return cavity (43) is opened at one end of the mounting bracket (4) near the return pipe (3) and is connected to the bottom of the first mounting cavity (41) and the second mounting cavity (42); The manifold (431) is located at the end of the return cavity (43) and is connected to the return pipe (3).

2. The transformer insulating oil dielectric strength testing device according to claim 1, characterized in that, The filter box (5) is equipped with a sealing ring (52) at both the inlet and outlet ends. The thickness of the sealing ring (52) is greater than the installation gap between the filter box (5) and the mounting bracket (4).

3. The transformer insulating oil dielectric strength testing device according to claim 2, characterized in that, The inner walls of the first mounting cavity (41) and the second mounting cavity (42) are provided with annular grooves (44) corresponding to the position of the sealing ring (52), and the sealing ring (52) is interference-fitted into the annular grooves (44).

4. The transformer insulating oil dielectric strength testing device according to claim 1, characterized in that, The filter box (5) has an elastic buckle (53) slidably disposed on the top, and the mounting bracket (4) has a slot (45) corresponding to the buckle (53) for use with the buckle (53).

5. The transformer insulating oil dielectric strength testing device according to claim 4, characterized in that, The buckle (53) has a guide slope at its end, and a paddle (531) is fixed to the outside of the buckle (53). The surface of the paddle (531) has an anti-slip structure.

6. The transformer insulating oil dielectric strength testing device according to claim 1, characterized in that, The filter box (5) has a transparent observation window (54) on top.

7. The transformer insulating oil dielectric strength testing device according to claim 1, characterized in that, A handle (61) is fixed to the valve stem connection of the two ball valves (6).

8. The transformer insulating oil dielectric strength testing device according to claim 1, characterized in that, The position of the manifold (431) is lower than the outlet end of the filter box (5) located below.

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