Impurity removing device, oil-immersed transformer and detection method of oil-immersed transformer

Abstract

The invention relates to the technical field of oil-immersed transformers, and discloses an impurity removing device, an oil-immersed transformer and a detection method of the oil-immersed transformer. The impurity removing device comprises a three-way pipe and a filtering part; the filtering part comprises an output pipeline, a filtering net, an impurity collecting device and a recycling pipeline; a first connector of the three-way pipe is used for being connected with an outlet of a radiator of the oil-immersed transformer, a second connector of the three-way pipe is used for being connected with an inlet of an oil tank of the oil-immersed transformer, a third connector of the three-way pipe is connected with the upstream end of the output pipeline, and the filter screen is fixed in the three-way pipe and located at the first connector of the three-way pipe. The downstream end of the output pipeline is connected with an inlet of the impurity collecting device, an outlet of the impurity collecting device is connected to the upstream end of the recycling pipeline, and the downstream end of the recycling pipeline is used for being connected with an inlet of an oil tank of the oil-immersed transformer.

Description

Technical Field

[0001] The present invention relates to the technical field of oil-immersed transformers, and particularly to an impurity removal device, an oil-immersed transformer, and a detection method thereof. Background Art

[0002] At present, in the power system, transformers are very important electrical equipment and are widely used in various fields. Among them, oil-immersed transformers use insulating oil as a cooling and insulating medium.

[0003] Although oil-immersed transformers have good insulation performance, good heat conduction performance, and are suitable for high-power and high-voltage occasions, the dielectric performance of insulating oil is greatly affected by impurities in the oil. Metal solid impurity particles generated during the manufacturing, transportation, installation, and operation of transformers, as well as paper scraps generated by insulating paper and insulating cardboard, will significantly reduce the breakdown voltage of insulating oil. Therefore, in order to avoid the obvious impact of solid impurities on the insulation performance of transformers, how to control the impurity content in the oil is crucial for the safe operation of transformers. Summary of the Invention

[0004] The object of the present invention is to provide guarantee for the safe and reliable operation of oil-immersed transformers.

[0005] In order to achieve the above object, the present invention provides an impurity removal device including a tee and a filtering part;

[0006] The filtering part includes an output pipeline, a filter net, an impurity collection device, and a recovery pipeline;

[0007] The first interface of the tee is used to connect the outlet of the radiator of the oil-immersed transformer, the second interface of the tee is used to connect the inlet of the oil tank of the oil-immersed transformer, the third interface of the tee is connected to the upstream end of the output pipeline, and the filter net is fixed in the tee and located at the first interface of the tee;

[0008] The downstream end of the output pipeline is connected to the inlet of the impurity collection device, the outlet of the impurity collection device is connected to the upstream end of the recovery pipeline, and the downstream end of the recovery pipeline is used to connect the inlet of the oil tank of the oil-immersed transformer.

[0009] Preferably, the filtering part further includes a first switching valve, a second switching valve, and a third switching valve. The first switching valve is connected to the first interface of the tee, the second switching valve is connected to the second interface of the tee, and the third switching valve is connected to the third interface of the tee.

[0010] Preferably, the impurity removal device further includes a control system. The control system is arranged at an interval with the filtering part, and the first switching valve, the second switching valve, and the third switching valve are all electrically connected to the control system.

[0011] Preferably, the filtering part further includes an impurity collection groove, which is arranged between the downstream end of the output pipeline and the inlet of the impurity collection device, and is located downstream of the third switching valve.

[0012] Preferably, the impurity removal device further includes a detection part, which includes a test pipeline and a breakdown voltage test module. The upstream end of the test pipeline is connected to the outlet of the impurity collection device, the downstream end of the test pipeline is connected to the breakdown voltage test module, and the breakdown voltage test module is electrically connected to the control system.

[0013] Preferably, the detection part includes an intercepting net, which is connected between the upstream end of the test pipeline and the outlet of the impurity collection device.

[0014] An oil-immersed transformer includes: the impurity removal device as described above, an oil tank and a radiator, and the impurity removal device, the oil tank and the radiator are arranged at intervals;

[0015] The inlet of the radiator is connected to the outlet of the oil tank, the outlet of the radiator is connected to the first interface of the tee, and the downstream end of the recovery pipeline is connected to the inlet of the oil tank.

[0016] Preferably, the inlet and the outlet of the radiator are arranged at intervals vertically.

[0017] A detection method for an oil-immersed transformer, which is used to control the above-mentioned oil-immersed transformer, includes a filtering state and a detection state;

[0018] The steps in the filtering state are as follows: The control system controls the first switching valve and the second switching valve to open, and the third switching valve to close, and the insulating oil flows from the outlet of the radiator along the tee through the filter screen to the inlet of the oil tank;

[0019] The steps in the detection state are as follows: S1. The control system controls the first switching valve and the second switching valve to close, and the third switching valve to open. The insulating oil mixed with impurities enters the impurity collection groove and the impurity collection device in sequence along the output pipeline, and then the impurities in the impurity collection device are removed;

[0020] S2. The control system controls the first switching valve to close, and the second switching valve and the third switching valve to open. The insulating oil flows from the outlet of the radiator into the breakdown voltage test module through the tee, the impurity collection groove, the impurity collection device, the intercepting net and the test pipeline in sequence;

[0021] The breakdown voltage test module sends the breakdown voltage test result to the control system;

[0022] If the control system determines that the breakdown voltage test result is qualified, it returns to the filtering state.

[0023] Preferably, the step S2 of detecting the state further includes: if the control system determines that the breakdown voltage test result is unqualified, the staff checks the oil-immersed transformer and does not send the unqualified insulating oil to the fuel tank.

[0024] Compared with the prior art, the impurity removal device, the oil-immersed transformer, and the detection method of the oil-immersed transformer according to the embodiments of the present invention have the following beneficial effects:

[0025] (1) By arranging a filter screen in the tee, and connecting the first interface of the tee to the outlet of the transformer radiator, when the insulating oil flowing into the radiator passes through the tee, the solid impurity particles therein can be effectively intercepted by the filter screen. This ensures that the impurities are filtered out before entering the transformer fuel tank, greatly reducing the impact of impurities on the insulation performance of the transformer and improving the safety and reliability of the transformer operation.

[0026] (2) The three interfaces of the tee are respectively connected to the radiator outlet, the fuel tank inlet, and the upstream end of the output pipeline, and the downstream end of the output pipeline is connected to the impurity collection device. Then, the treated insulating oil is sent back to the fuel tank through the recovery pipeline. This pipeline connection method can guide the insulating oil to flow along a preset path, realize the separation and collection of impurities, and at the same time ensure that the filtered insulating oil can smoothly return to the fuel tank to participate in the cycle without affecting the normal operation of the transformer.

[0027] (3) The entire impurity removal device is mainly composed of a tee and a filtering part, and the structures of each component are clear without complex structures. This structural design makes the manufacturing process of the device relatively easy, reduces the production cost, and is also convenient for later maintenance and overhaul. The device does not require a large-scale transformation of the original overall structure of the transformer, and only needs to reasonably connect the tee to the radiator outlet, the fuel tank inlet, and the relevant pipelines. This has great advantages for transformers that have been put into use, and can install and use the impurity removal device conveniently and quickly without affecting the normal operation of the transformer, reducing the workload and cost of the transformation project. Description of the Drawings

[0028] Figure 1 is a schematic diagram of an embodiment of the present invention.

[0029] In the figure, 1, tee; 2, output pipeline; 3, filter screen; 4, impurity collection device; 5, recovery pipeline; 6, first switching valve; 7, second switching valve; 8, third switching valve; 9, impurity collection groove; 10, test pipeline; 11, breakdown voltage test module;

[0030] 100, radiator; 200, fuel tank. Detailed Embodiments

[0031] The following will further describe in detail the specific implementation manners of the present invention in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0032] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "longitudinal", "lateral", "vertical", "horizontal", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. in the present invention are based on the orientation or positional relationships shown in the accompanying drawings. These are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0033] In the description of the invention, it should be noted that unless otherwise clearly specified and defined, terms such as "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0034] As Figure 1 shown, an impurity removal device of a preferred embodiment of the present invention includes a three-way pipe 1 and a filtering part;

[0035] The filtering part includes an output pipeline 2, a filter net 3, an impurity collection device 4 and a recovery pipeline 5;

[0036] The first interface of the three-way pipe 1 is used to connect to the outlet of the radiator 100 of the oil-immersed transformer, the second interface of the three-way pipe 1 is used to connect to the inlet of the oil-immersed transformer oil tank 200, the third interface of the three-way pipe 1 is connected to the upstream end of the output pipeline 2, and the filter net 3 is fixed in the three-way pipe 1 and located at the first interface of the three-way pipe 1;

[0037] The downstream end of the output pipeline 2 is connected to the inlet of the impurity collection device 4, the outlet of the impurity collection device 4 is connected to the upstream end of the recovery pipeline 5, and the downstream end of the recovery pipeline 5 is used to connect to the inlet of the oil-immersed transformer oil tank 200.

[0038] Based on the above solution, by setting a filter screen 3 inside the tee pipe 1, and connecting the first interface of the tee pipe 1 to the outlet of the transformer radiator 100, when the insulating oil flowing into the radiator 100 passes through the tee pipe 1, the solid impurity particles therein can be effectively intercepted by the filter screen 3. It ensures that the impurities are filtered out before entering the transformer oil tank 200, greatly reducing the impact of impurities on the insulation performance of the transformer and improving the safety and reliability of the transformer operation. The three interfaces of the tee pipe 1 are respectively connected to the outlet of the radiator 100, the inlet of the oil tank 200, and the upstream end of the output pipeline 2. The downstream end of the output pipeline 2 is connected to the impurity collection device 4, and the processed insulating oil is sent back to the oil tank 200 through the recovery pipeline 5. This pipeline connection method can guide the insulating oil to flow along the preset path, realize the separation and collection of impurities, and at the same time ensure that the filtered insulating oil can smoothly return to the oil tank 200 to participate in the cycle without affecting the normal operation of the transformer. The entire impurity removal device mainly consists of the tee pipe 1 and the filtering part, and the structure of each component is clear without complex construction. The structural design makes the manufacturing process of the device relatively easy, reduces the production cost, and is also convenient for later maintenance and repair. This device does not require a large-scale transformation of the original overall structure of the transformer, and only needs to reasonably connect the tee pipe 1 to the outlet of the radiator 100, the inlet of the oil tank 200, and the relevant pipelines. This has great advantages for transformers that have been put into use, and can conveniently and quickly install and use this impurity removal device without affecting the normal operation of the transformer, reducing the workload and cost of the transformation project.

[0039] Furthermore, the filtering part further includes a first switching valve 6, a second switching valve 7, and a third switching valve 8. The first switching valve 6 is connected to the first interface of the tee pipe 1, the second switching valve 7 is connected to the second interface of the tee pipe 1, and the third switching valve 8 is connected to the third interface of the tee pipe 1.

[0040] Based on the above solution, the first switching valve 6 is connected to the first interface of the tee pipe 1, the second switching valve 7 is connected to the second interface of the tee pipe 1, and the third switching valve 8 is connected to the third interface of the tee pipe 1. Through the independent control of these three switching valves, the flow path of the insulating oil in the tee pipe 1 can be flexibly regulated. During normal operation, the first switching valve 6 and the third switching valve 8 can be opened, and the second switching valve 7 can be closed, so that the insulating oil flows out of the radiator 100, is filtered by the filter screen 3, and then returns to the oil tank 200 through the recovery pipeline 5; while when impurity cleaning is required, the first switching valve 6 and the third switching valve 8 can be closed, and the second switching valve 7 can be opened to discharge the impurities in the impurity collection device 4, making the entire impurity removal process more accurate and efficient, and capable of adjusting the oil flow direction at any time according to actual needs to meet different operation scenarios.

[0041] Further, the impurity removal device further includes a control system, which is arranged at an interval from the filtering part. The first switching valve 6, the second switching valve 7 and the third switching valve 8 are all electrically connected to the control system.

[0042] Based on the above solution, the setting of the control system enables the impurity removal device to achieve an automatic operation mode. By pre-writing and setting corresponding programs, the control system can automatically and accurately control the opening and closing states and opening degrees of the first switching valve 6, the second switching valve 7 and the third switching valve 8. When the transformer is operating normally, the control system can automatically open and close the switching valves at set time intervals to achieve regular filtration and circulation of the insulating oil, without frequent manual intervention, improving work efficiency. Due to the electrical connection between the control system and the switching valves, the impurity removal device has the function of remote monitoring and control. Operators can perform remote operations at any time and place according to needs through remote terminals such as computers or mobile phones.

[0043] Further, the filtering part further includes an impurity collection groove 9, which is arranged between the downstream end of the output pipeline 2 and the inlet of the impurity collection device 4, and is located downstream of the third switching valve 8.

[0044] Based on the above solution, the setting of the impurity collection groove 9 can more effectively collect the impurities filtered by the filter screen 3. When the insulating oil flows through the filter screen 3, the impurities are intercepted on the surface of the filter screen, and as the impurities accumulate continuously, they will gradually fall into the impurity collection groove 9 under the action of gravity. The impurities in the insulating oil can be centrally collected, avoiding the dispersion of impurities in the pipeline or re-mixing into the insulating oil, improving the efficiency and effect of impurity collection.

[0045] Further, the impurity removal device further includes a detection part, which includes a test pipeline 10 and a breakdown voltage test module 11. The upstream end of the test pipeline 10 is connected to the outlet of the impurity collection device 4, the downstream end of the test pipeline 10 is connected to the breakdown voltage test module 11, and the breakdown voltage test module 11 is electrically connected to the control system.

[0046] Based on the above solution, the detection unit can perform quality detection on the insulating oil after being processed by the impurity removal device. The possible remaining impurities are further filtered out through the intercepting net, and then the breakdown voltage test module 11 is used to measure the breakdown voltage of the insulating oil. Only when the breakdown voltage test result is qualified, it indicates that the quality of the insulating oil meets the requirements and can be recycled back into the transformer oil tank 200. This can effectively ensure the purity and insulation performance of the insulating oil, and improve the operation safety and reliability of the transformer. The breakdown voltage of the insulating oil is an important indicator reflecting the insulation performance of the transformer. If the impurity content in the insulating oil exceeds the standard, it may cause faults such as short circuits and discharges inside the transformer, seriously threatening the safe operation of the transformer. By monitoring the breakdown voltage of the insulating oil in real time, the detection unit can detect potential safety hazards in advance, take measures in time for treatment, and avoid accidents.

[0047] Furthermore, the detection unit includes an intercepting net, which is connected between the upstream end of the test pipeline 10 and the outlet of the impurity collection device 4.

[0048] Based on the above solution, the intercepting net can intercept the impurities in the impurity collection device 4 from entering the test pipeline 10, ensuring the accuracy of the breakdown voltage test by the breakdown voltage test module 11.

[0049] To sum up, the device has a simple structure and low manufacturing cost. It does not require major modification to the original overall structure of the transformer. The solid impurity particles in the insulating oil are collected through the combined action of opening and closing each valve and the filter net. This device uses the control system to control the opening states of the three switching valves, without the need for additional manual operation. Under the condition of ensuring operation safety, it realizes the process of filtering and collecting impurities in the insulating oil without affecting the normal operation of the transformer. After the filtration is completed, when the breakdown voltage test result of the insulating oil meets the standard requirements, it can continue to enter the transformer oil tank to participate in the cooling cycle, without the need to supplement the insulating oil in the transformer.

[0050] An oil-immersed transformer includes: the impurity removal device as described above, an oil tank 200, and a radiator 100, and the impurity removal device, the oil tank 200, and the radiator 100 are arranged at intervals;

[0051] The inlet of the radiator 100 is connected to the outlet of the oil tank 200, the outlet of the radiator 100 is connected to the first interface of the three-way pipe 1, and the downstream end of the recovery pipeline 5 is connected to the inlet of the oil tank 200.

[0052] Based on the above solution, the oil-immersed transformer forms a complete circulation system by arranging the impurity removal device, the oil tank 200, and the radiator 100 at intervals and reasonably connecting each component. The inlet of the radiator 100 is connected to the outlet of the oil tank 200, so that the transformer oil can smoothly flow into the radiator 100 for cooling after being heated in the oil tank 200; the outlet of the radiator 100 is connected to the first interface of the three-way pipe 1, and the insulated oil after heat dissipation enters the impurity removal device through the three-way pipe 1 for impurity filtration and collection; the downstream end of the recovery pipeline 5 is then connected to the inlet of the oil tank 200, enabling the filtered insulated oil to return to the oil tank 200 to participate in the next cycle. This design ensures the continuous circulation and effective heat dissipation of the transformer oil, improves the heat dissipation efficiency of the transformer, and guarantees the safe and stable operation of the transformer.

[0053] The impurity removal device plays a key role in the entire circulation system. It can timely remove solid impurity particles in the insulated oil, prevent impurities from accumulating inside the transformer, and avoid the decline of insulation performance caused by impurities. The purified insulated oil after filtration returns to the oil tank 200, providing a reliable guarantee for the insulation system of the transformer and extending the service life of the transformer.

[0054] Furthermore, the inlet of the radiator 100 and the outlet of the radiator 100 are arranged at intervals vertically.

[0055] Based on the above solution, arranging the inlet and outlet at intervals vertically can make full use of the gravity effect, enabling the insulated oil to fully exchange heat with the radiator 100.

[0056] A detection method for an oil-immersed transformer, used to control the above-mentioned oil-immersed transformer, includes a filtration state and a detection state;

[0057] The steps of the filtration state are as follows: The control system controls the first switching valve 6 and the second switching valve 7 to open, and the third switching valve 8 to close. The insulated oil flows from the outlet of the radiator 100 along the three-way pipe 1 through the filter screen 3 to the inlet of the oil tank 200;

[0058] The steps of the detection state are as follows: S1. The control system controls the first switching valve 6 and the second switching valve 7 to close, and the third switching valve 8 to open. The insulated oil mixed with impurities enters the impurity collection groove 9 and the impurity collection device 4 in sequence along the output pipeline 2, and then the impurities in the impurity collection device 4 are removed;

[0059] S2. The control system controls the first switching valve 6 to close, and the second switching valve 7 and the third switching valve 8 to open. The insulated oil flows from the outlet of the radiator 100 in sequence along the three-way pipe 1, the impurity collection groove 9, the impurity collection device 4, the intercepting net, and the test pipeline 10 into the breakdown voltage test module 11;

[0060] The breakdown voltage test module 11 sends the breakdown voltage test result to the control system;

[0061] If the control system determines that the breakdown voltage test result is qualified, it returns to the filtration state.

[0062] Based on the above solution, in the filtration state, the control system precisely controls the opening of the first switching valve 6 and the second switching valve 7, and the closing of the third switching valve 8, so that the insulating oil can smoothly flow from the outlet of the radiator 100 through the tee 1 and the filter screen 3 to the inlet of the fuel tank 200. The filter screen 3 can intercept solid impurity particles in the insulating oil to prevent them from entering the fuel tank 200 and damaging the internal insulation system of the transformer, thus ensuring the safe operation of the transformer. In the detection state, through two-step switching, the breakdown voltage of the insulating oil can be comprehensively and precisely detected. In step S1, the insulating oil mixed with impurities is collected in the impurity collection device 4 for preliminary cleaning to remove most of the visible impurities; then, in step S2, the preliminarily cleaned insulating oil is sent to the breakdown voltage test module 11 for accurate testing. This detection method can more accurately evaluate the insulation performance of the insulating oil and timely discover potential safety hazards.

[0063] Furthermore, step S2 of the detection state also includes: if the control system determines that the breakdown voltage test result is unqualified, the staff checks the oil-immersed transformer and does not send the unqualified insulating oil to the fuel tank 200.

[0064] Based on the above solution, after the breakdown voltage test module 11 feeds back the test result to the control system, the control system can intelligently judge the quality of the insulating oil according to the preset qualified standard. When the detection result is unqualified, the control system can timely issue an alarm and notify the staff for inspection and handling, avoiding transformer failures caused by the quality problem of the insulating oil.

[0065] In summary, the embodiment of the present invention provides an impurity removal device, an oil-immersed transformer and its detection method. The impurity removal device is provided with a filter screen 3 in the tee pipe 1, and the first interface of the tee pipe 1 is connected to the outlet of the transformer radiator 100. When the insulating oil flowing into the radiator 100 passes through the tee pipe 1, the solid impurity particles therein can be effectively intercepted by the filter screen 3. It ensures that the impurities are filtered out before entering the transformer oil tank 200, greatly reducing the influence of the impurities on the insulation performance of the transformer and improving the safety and reliability of the transformer operation. The three interfaces of the tee pipe 1 are respectively connected to the outlet of the radiator 100, the inlet of the oil tank 200 and the upstream end of the output pipeline 2. The downstream end of the output pipeline 2 is connected to the impurity collection device 4, and the treated insulating oil is sent back to the oil tank 200 through the recovery pipeline 5. This pipeline connection method can guide the insulating oil to flow along the preset path, realize the separation and collection of impurities, and at the same time ensure that the filtered insulating oil can smoothly return to the oil tank 200 to participate in the cycle without affecting the normal operation of the transformer. The entire impurity removal device is mainly composed of the tee pipe 1 and the filtering part, and the structures of each component are clear without complex structures. The structural design makes the manufacturing process of the device relatively easy, reduces the production cost, and is also convenient for later maintenance and repair. The device does not need to greatly transform the original overall structure of the transformer, and only needs to reasonably connect the tee pipe 1 with the outlet of the radiator 100, the inlet of the oil tank 200 and the relevant pipelines. This has great advantages for the transformers that have been put into use, and can conveniently and quickly install and use the impurity removal device without affecting the normal operation of the transformer, reducing the workload and cost of the transformation project.

[0066] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and replacements can be made, and these improvements and replacements should also be regarded as the protection scope of the present invention.

Claims

1. An impurity removal device, characterized in that: It comprises a three-way pipe (1) and a filter part; The filtering part comprises an output pipe (2), a filter screen (3), an impurity collecting device (4) and a recovery pipe (5); The first interface of the three-way pipe (1) is used to connect to the outlet of the radiator (100) of the oil-immersed transformer, the second interface of the three-way pipe (1) is used to connect to the inlet of the oil tank (200) of the oil-immersed transformer, the third interface of the three-way pipe (1) is connected to the upstream end of the output pipeline (2), and the filter (3) is fixed in the three-way pipe (1) and is located at the first interface of the three-way pipe (1); The downstream end of the output pipe (2) is connected to the inlet of the impurity collecting device (4), the outlet of the impurity collecting device (4) is connected to the upstream end of the recovery pipe (5), and the downstream end of the recovery pipe (5) is used to connect to the inlet of the oil tank (200) of the oil-immersed transformer.

2. The impurity removing device according to claim 1, characterized in that: The filter unit further comprises a first switch valve (6), a second switch valve (7) and a third switch valve (8), wherein the first switch valve (6) is connected to a first interface of the three-way pipe (1), the second switch valve (7) is connected to a second interface of the three-way pipe (1), and the third switch valve (8) is connected to a third interface of the three-way pipe (1).

3. The impurity removing device according to claim 2, characterized in that: It also includes a control system, which is spaced apart from the filter unit, and the first switch valve (6), the second switch valve (7) and the third switch valve (8) are all electrically connected to the control system.

4. The impurity removing device according to claim 3, characterized in that: The filter unit further comprises an impurity collecting groove (9), wherein the impurity collecting groove (9) is arranged between the downstream end of the output pipe (2) and the inlet of the impurity collecting device (4), and is located downstream of the third switch valve (8).

5. The impurity removing device according to claim 4, characterized in that: The invention also comprises a detection unit, the detection unit comprising a test pipe (10) and a breakdown voltage test module (11), the upstream end of the test pipe (10) being connected to the outlet of the impurity collecting device (4), the downstream end of the test pipe (10) being connected to the breakdown voltage test module (11), and the breakdown voltage test module (11) being electrically connected to the control system.

6. The impurity removing device according to claim 5, characterized in that: The detection part comprises an interception net, which is connected between the upstream end of the test pipeline (10) and the outlet of the impurity collecting device (4).

7. An oil-immersed transformer, characterized in that: include: The impurity removing device, the oil tank (200) and the radiator (100) according to claim 6, wherein the impurity removing device, the oil tank (200) and the radiator (100) are arranged at intervals; The inlet of the radiator (100) is connected to the outlet of the oil tank (200), the outlet of the radiator (100) is connected to the first interface of the three-way pipe (1), and the downstream end of the recovery pipe (5) is connected to the inlet of the oil tank (200).

8. The oil-immersed transformer according to claim 7, characterized in that: The inlet of the radiator (100) and the outlet of the radiator (100) are arranged vertically spaced apart from each other.

9. A method for detecting an oil-immersed transformer, characterized in that: Used to control the oil-immersed transformer according to any one of claims 7 or 8, including filtering state and detection state; The filtering state steps are as follows: the control system controls the first switch valve (6) and the second switch valve (7) to be opened, and the third switch valve (8) to be closed, so that the insulating oil flows from the outlet of the radiator (100) along the three-way pipe (1) through the filter screen (3) to the inlet of the oil tank (200); The detection state steps are as follows: S1, the control system controls the first switch valve (6) and the second switch valve (7) to be closed, and the third switch valve (8) to be opened, so that the insulating oil mixed with impurities enters the impurity collecting groove (9) and the impurity collecting device (4) along the output pipeline (2) in sequence, and then the impurities in the impurity collecting device (4) are removed; S2, the control system controls the first switch valve (6) to be closed, the second switch valve (7) and the third switch valve (8) to be opened, and the insulating oil flows from the outlet of the radiator (100) along the three-way pipe (1), the impurity collection groove (9), the impurity collection device (4), the interception net and the test pipeline into the breakdown voltage test module (11); The breakdown voltage test module (11) sends the breakdown voltage test result to the control system; If the control system determines that the breakdown voltage test result is qualified, it returns to the filtering state.

10. The oil-immersed transformer detection method according to claim 9, characterized in that: The step S2 of detecting the state further includes: if the control system determines that the breakdown voltage test result is unqualified, the staff inspects the oil-immersed transformer and does not send unqualified insulating oil to the oil tank (200).

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