On-line withstand voltage test device for transformer oil

Abstract

The invention discloses an on-line withstand voltage test device for transformer oil, relates to the technical field of electrical test instruments, and is used for testing the dielectric constant of the transformer oil. The device can be directly installed between the oil pumping pipe and the oil filling pipe of the transformer oil arc extinguishing on-load tap-changer without being carried back and forth, the automatic oil pumping device is designed, oil is directly pumped out of the transformer without being in contact with the outside, obtained detection data are accurate, and insulating oil is not wasted. The device consists of a transformer oil withstand voltage tester and an automatic oil pumping device, wherein a test unit is arranged in the automatic oil pumping device. The automatic oil pumping device is directly communicated with an oil pumping pipe and an oil injection pipe of the transformer oil arc extinguishing on-load tap-changer, so that totally-closed sampling and reinjection processes are realized. Exposure of an oil sample is avoided, the purity of an oil product is kept in the whole process, and then the accuracy of data is improved.

Description

Technical Field

[0001] The invention relates to the technical field of electrical testing instruments, and in particular to an online withstand voltage testing device for transformer oil. Background Art

[0002] Transformer oil is an insulating medium. Under the action of an electric field, the insulating medium has a certain ability to withstand the electric field strength. When the electric field strength exceeds its insulation strength, the transformer oil will be broken down and discharge will occur. The transformer oil withstand voltage test device is an important device specially used to detect the insulation withstand voltage performance of transformer oil. It is mainly composed of a boost system, an electrode system, a measurement and control system, a protection system, and a data processing and display system. When it works, it first goes through a series of pre-test preparations such as safe grounding, preparing oil samples, and checking equipment, and then sets the boost speed, number of tests, standing and stirring time and other parameters, connects the test circuit and turns on the power. During the test, the oil sample starts to increase the voltage after standing and stirring, and maintains it for a certain period of time after it reaches the specified test voltage value. During this period, the oil sample is observed and the breakdown voltage value, test time and other data are recorded. After the test, the voltage is reduced and the power is turned off. Finally, the data is processed and analyzed to determine whether the withstand voltage performance of the transformer oil is qualified, providing a key basis for the safe and stable operation of the transformer.

[0003] The existing transformer oil withstand voltage test device mainly adopts the method of injecting transformer oil into the oil cup. This traditional test method involves multiple steps, including extracting the oil from the transformer, injecting it into the test device, testing it, and then injecting the oil back into the transformer. This process requires frequent handling of the test device, which is cumbersome to operate. In addition, during the oil extraction process, the oil may come into contact with the outside air, which will cause contamination of the oil sample and affect the accuracy and reliability of the test data.

[0004] Therefore, there is an urgent need to improve the existing transformer oil withstand voltage test device to facilitate operation and avoid transformer oil contamination as much as possible. Summary of the invention

[0005] In view of the above shortcomings, the present invention provides an online withstand voltage test device for transformer oil, which can be directly installed between the oil extraction pipe and the oil filling pipe of the transformer oil arc extinguishing on-load tap changer without the need for back and forth transportation. An automatic oil extraction device is designed to directly extract the oil from the transformer without contact with the outside world, and the obtained detection data is more accurate.

[0006] In order to achieve the above object, the present invention adopts the following technical scheme:

[0007] A transformer oil online withstand voltage test device comprises a transformer oil withstand voltage tester and an automatic oil pumping device. The transformer oil withstand voltage tester is provided with a test unit located in the automatic oil pumping device. The automatic oil pumping device is fixedly connected to the transformer to be tested and communicated with the oil pipe of the transformer to be tested. The transformer oil withstand voltage tester is electrically connected to the automatic oil pumping device.

[0008] Preferably, the automatic oil pumping device includes an automatic oil pumping component and a shell, the automatic oil pumping component is installed in the shell, the shell is fixedly connected to the transformer to be tested, the automatic oil pumping component includes a connecting pipe, a test unit, a solenoid valve, an oil pump, an oil discharge pipe and an oil extraction pipe, the test unit includes a conductive column, an electrode and an oil cup, there are two conductive columns and they are electrically connected to the transformer oil withstand voltage tester, there are two electrodes and they are electrically connected to the two conductive columns respectively, the two electrodes are sealed and extend into the oil cup and are arranged opposite to each other at a certain distance, the oil discharge pipe is sealed and connected to the upper part of the oil cup and extends out of the shell to be connected to the oil filling pipe of the transformer to be tested, the connecting pipe is sealed and connected to the lower part of the oil cup and is connected to the oil pump, the oil extraction pipe is sealed and connected to the upper part of the oil pump and extends out of the shell and is connected to the oil extraction pipe of the transformer to be tested, the oil pump is fixedly connected in the shell, and the solenoid valve, the test unit and the oil pump are electrically connected to the transformer oil withstand voltage tester.

[0009] Preferably, the transformer oil withstand voltage tester includes a tester body, which includes a control unit, an interactive panel, a data processing unit, a test circuit and a power module. The power module is used to provide a stable power supply to various parts in the transformer oil withstand voltage tester and the oil pump and the solenoid valve in the automatic oil pumping device. The test unit is electrically connected to the test circuit. The control unit is electrically connected to various parts in the oil withstand voltage tester and the oil pump and the solenoid valve in the automatic oil pumping device to control the various units to work in an orderly manner according to a preset program. The interactive panel is arranged on the outer surface of the tester body.

[0010] Preferably, the outer shell is provided with oil extraction assembly terminals, there are multiple oil extraction assemblies which are electrically connected to the oil pump, the solenoid valve and the test unit respectively, the interactive panel of the transformer oil withstand voltage tester includes a number of tester terminals equal to the number, and the transformer oil withstand voltage tester is electrically connected to the automatic oil extraction device through wires.

[0011] Preferably, the housing comprises a housing body, the housing body is provided with an observation window, and the observation window is arranged at a position of the housing directly facing the test unit.

[0012] Preferably, a mounting plate is provided at the lower side of the observation window, the test unit is provided on the mounting plate, and a support member is provided at the lower part of the mounting plate, the support member is fixedly connected to the housing to provide support force for the mounting plate.

[0013] Preferably, the transformer oil withstand voltage tester is fixedly mounted on the automatic oil pumping device, and the interactive panel in the transformer oil withstand voltage tester is located at a side away from the transformer to be tested.

[0014] Preferably, the transformer oil withstand voltage tester is provided separately from the automatic oil pumping device.

[0015] Preferably, the transformer oil withstand voltage tester also includes a portable box, which includes a box body and a box cover, the box cover is hinged on the box body, the tester body is installed in the box body and the interactive panel is located on the unclosed side of the box body, and a plurality of buckles are also provided on the box cover to lock the box body and the box cover when the box body and the box cover are closed.

[0016] Preferably, the box cover is also provided with a handle, and the handle is arranged on the side of the box cover facing away from the box body.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention is specially designed for online detection of the insulation withstand voltage performance of transformer oil, aiming to simplify the operation process, improve the detection accuracy, ensure the safety of operation, improve the accuracy of the detection data, and avoid wasting insulating oil. The device consists of a transformer oil withstand voltage tester and an automatic oil extraction device, wherein the test unit is arranged inside the automatic oil extraction device. The equipment can be directly fixedly installed between the oil extraction pipe and the oil filling pipe of the transformer oil arc extinguishing on-load tap changer, eliminating the step of carrying the oil sample back and forth in the traditional test, and can automatically extract the transformer oil for testing, realizing a fully closed sampling and re-injection process. The automatic oil extraction device is directly connected to the oil extraction pipe and the oil filling pipe of the transformer, relying on the closed pipeline structure to avoid the exposure of the oil sample, maintaining the purity of the oil throughout the process, and thereby improving the accuracy of the data.

[0019] 2. The automatic oil extraction device in the present invention directly extracts oil samples from the transformer in a closed manner without manual intervention. The operator only needs to start the device to transport the oil sample from the transformer to the test unit through the built-in oil extraction pump. The entire sampling process is fully automated. After the test is completed, the system can also re-inject the oil sample back into the transformer without discarding it or reprocessing it. This design not only protects the stability of the oil sample, but also avoids the waste of the oil sample. At the same time, it eliminates the direct contact between the operator and the oil sample and reduces the operational risk. Since the entire process is carried out under automatic control, the possibility of human error is reduced and the efficiency is significantly improved.

[0020] 3. The present invention installs the automatic oil pumping device on the transformer to be tested, without modifying the transformer or making additional requirements for on-site conditions. During the test, it is not necessary to interrupt other operating procedures of the transformer, which greatly reduces the time of power outage or downtime and improves the efficiency of the test work. This online detection function allows maintenance personnel to regularly and quickly test the insulation performance of oil products, thereby promptly discovering oil quality problems and providing a strong guarantee for the stable operation of the transformer.

[0021] 4. In addition, the present invention is also much simpler in terms of operation. It has a high degree of automation, and the test process is mostly an automated process. The operator only needs to perform basic settings and start-up to complete the entire test work, which reduces the skill requirements of the operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for describing the embodiments are briefly introduced below.

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 For the present invention Figure 1 Front view of;

[0025] Figure 3 It is a schematic diagram of the overall structure of the automatic oil pumping device in the present invention;

[0026] Figure 4 It is a schematic diagram of the internal structure of the automatic oil pumping device in the present invention;

[0027] Figure 5 For the present invention Figure 3 Front view of;

[0028] Figure 6 is a cross-sectional view of the vacuum oil cup of the present invention;

[0029] Figure 7 It is a schematic diagram of the overall structure of a transformer oil withstand voltage tester according to another embodiment of the present invention;

[0030] Figure 8 For the present invention Figure 6 Oblique view of .

[0031] Figure numerals: 1. Transformer oil withstand voltage tester; 100. Tester body; 101. Interactive panel; 102. Tester terminal; 2. Housing; 200. Housing body; 201. Observation window; 202. Mounting plate; 203. Support; 3. Automatic oil extraction assembly; 300. Oil cup; 301. Connecting pipe; 302. Electrode; 303. Conductive column; 304. Solenoid valve; 305. Oil pump; 306. Oil discharge pipeline; 307. Oil extraction pipeline; 308. Oil extraction assembly terminal; 4. Portable box; 400. Box body; 401. Box cover; 4011. Buckle; 4012. Handle. DETAILED DESCRIPTION

[0032] The technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all of the embodiments. Based on the embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" 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 mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0035] Embodiment 1:

[0036] When a traditional transformer oil withstand voltage tester 1 is used to test transformer oil, the transformer oil needs to be taken out of the equipment and brought to a laboratory or a designated test location for a series of tests. However, the multiple transfers during the sampling process not only increase the difficulty of operation, but also may cause the oil sample to contact the external environment, thereby being contaminated, oxidized, or even having an increased water content, affecting the accuracy of the test results.

[0037] In order to solve the above problems, the present invention provides a transformer oil online withstand voltage test device, such as Figure 1-Figure 6As shown, the transformer oil online withstand voltage test device is specially designed for online detection of the insulation withstand voltage performance of transformer oil, aiming to simplify the operation process, improve the detection accuracy, ensure the safety of operation, and avoid wasting insulating oil resources. The device consists of a transformer oil withstand voltage tester 1 and an automatic oil pumping device. The transformer oil withstand voltage tester 1 is fixedly arranged on the automatic oil pumping device to form an integrated design. This design closely combines the transformer oil withstand voltage tester 1 with the automatic oil pumping device, making the entire system more compact, stable, and easier to operate. It is suitable for transformer oil sample testing in remote areas, avoiding the need for operators to carry equipment for a long time, affecting the test efficiency. The transformer oil withstand voltage tester 1 is provided with a test unit located in the automatic oil pumping device. The automatic oil pumping device can be directly fixed on the transformer and connected to the oil extraction pipe and the oil filling pipe of the transformer oil arc extinguishing load tap changer, eliminating the steps of carrying oil samples back and forth in the traditional test, and can automatically extract transformer oil for testing, realizing a fully enclosed sampling and refilling process. The online withstand voltage test device is directly connected between the oil extraction pipe and the oil filling pipe of the transformer. It relies on the closed pipeline structure to avoid the exposure of the oil sample, maintain the purity of the oil throughout the process, and thus improve the accuracy of the data. The transformer oil withstand voltage tester 1 is electrically connected to the automatic oil extraction device. The test unit of the device is installed inside the automatic oil extraction module and is electrically connected to the test circuit in the transformer oil withstand voltage tester 1. In this way, after the oil sample is extracted into the test unit, the transformer oil withstand voltage tester 1 can immediately test the withstand voltage performance. During the test, the transformer oil is subjected to a gradually increasing voltage in the pressurized electric field until it breaks down. The equipment can accurately record and analyze the breakdown voltage value of the oil sample to evaluate its insulation performance. Under this device, the test process can be realized in real time, avoiding the degradation of oil performance caused by long-term storage or exposure after sampling.

[0038] As a further technical improvement, the device includes an automatic oil extraction assembly 3 and a shell 2 in the automatic oil extraction device. The automatic oil extraction assembly 3 is installed in the shell 2, and is composed of a connecting pipe 301, a test unit, a solenoid valve 304, an oil pump 305, an oil discharge pipeline 306 and an oil extraction pipeline 307. The shell 2 adopts an insulating structural material to ensure the safety of the device to prevent leakage, and can effectively prevent the influence of the external environment on the oil sample, and avoid the entry of pollutants such as dust and moisture, so as to maintain the test accuracy and safety. The test unit is a core component in the traditional transformer oil withstand voltage tester 1, including a conductive column 303, an electrode 302 and an oil cup 300. The device rents the test unit into the automatic oil extraction assembly 3. There are two conductive columns 303, which are electrically connected to the test circuit in the transformer oil withstand voltage tester 1 respectively to ensure the stability of the electrical signal transmission during the test. The conductive column 303 is connected to the electrode 302 in the oil cup 300 through sealing technology. The electrodes 302 are also designed to be two and are electrically connected to the conductive column 303, which can generate an electric field during the test to evaluate the withstand voltage breakdown performance of the oil sample. The electrodes 302 are arranged in the oil cup 300 after precise calculation to maintain the optimal distance, thereby generating a uniform electric field during the withstand voltage test, effectively reducing the data deviation caused by the distance error, and making the test results more repeatable. The oil cup 300 is used as a container for storing the oil sample, which can provide a closed space, reduce external interference, and ensure the stability of the test environment.

[0039] The automatic oil extraction assembly 3 includes a series of interconnected pipeline systems such as an oil discharge pipeline 306, an oil extraction pipeline 307, a connecting pipe 301 and an oil pump 305. The oil discharge pipeline 306 is sealed and connected to the upper part of the oil cup 300 and is connected to the oil filling pipe of the transformer to be tested through a flange. A sealing rubber ring is also provided at the connecting flange part to prevent oil leakage. After the test is completed, the oil sample can be smoothly discharged back to the transformer. The oil extraction pipeline 307 is sealed and connected to the upper part of the oil pump 305. The sealing structure can prevent oil sample leakage. The upper end of the oil extraction pipeline 307 is connected to the oil extraction pipe of the transformer to be tested through a flange connection. A sealing rubber ring is also provided at the flange connection position to prevent oil sample leakage. The connecting pipe 301 connects the oil pump 305 with the bottom of the oil cup 300. The solenoid valve 304 is arranged on the connecting pipe 301. Under the control of the control unit, the connecting pipe 301 connecting the oil pump 305 and the oil cup 300 is opened or closed to prevent the oil sample from flowing during the test and affecting the experimental results. The oil pump 305 is fixedly connected to the inside of the housing 2, and has a strong and stable flow driving force, and can smoothly pump the oil sample to the test unit under the command of the control unit. This automated oil sample management process makes the entire oil sample test process closed-loop, avoids secondary contamination of the oil, reduces oil loss caused by manual operation, improves resource utilization efficiency and avoids environmental pollution.

[0040] The transformer oil withstand voltage tester 1 includes a tester body 100, which integrates multiple functional components such as a control unit, an interactive panel 101, a data processing unit, a test circuit and a power module. The various components cooperate with each other to form a complete test system. The control unit is the command center of the entire test process. It accurately controls each unit of the device through a preset program, including the start and stop regulation of the oil pump 305 and the solenoid valve 304 in the automatic oil pumping device and each unit in the tester body 100, to ensure that the extraction, testing and re-injection of the oil sample are carried out in an orderly manner. The test circuit is electrically connected to the conductive column 303, and the conductive column 303 is responsible for transmitting the electrical signal in the test circuit to the electrode 302. The electrode 302 is sealed and extends into the oil cup 300 and is arranged relative to each other at a certain distance to generate a stable and uniform electric field. In this way, the voltage applied to the electrode 302 by the test circuit gradually increases, and the test system can accurately measure the breakdown voltage of the oil sample to ensure the reliability of the withstand voltage test. At the same time, the control unit is connected to the data processing unit, which can process the pressure resistance data of the oil sample in real time and transmit the processing results to the interactive panel 101 for display.

[0041] The interactive panel 101 is arranged on the outer surface of the tester body 100, and has a clear graphical interface and intuitive operation buttons. The operator can view the test data in real time, control the test process, and adjust the test parameters as needed through the interactive panel 101, which includes but is not limited to the operation and interactive modules such as voltage controller, time controller, grounding column, power socket, power switch, printer, etc. The data processing unit can analyze the data fed back in the test circuit, identify the withstand voltage breakdown voltage of the oil sample, and generate a detailed test report and print the data after the test is completed. In this way, the operator can easily complete the test work without professional skills, which greatly reduces the complexity of operation.

[0042] As the energy center of the system, the power module provides stable power support for each unit in the tester body 100 and the oil pump 305 and solenoid valve 304 in the automatic oil pumping device. The power module has a voltage stabilization and regulation function to ensure that there will be no voltage fluctuations during the test, thereby ensuring the test accuracy and effectively extending the service life of each component. In addition, with the support of the power module, the system can realize the power-off protection function. Even if there is a sudden power outage, the protection device in the system will be triggered immediately to avoid oil sample leakage or other safety hazards.

[0043] Through the organic combination and coordination of the above components, this technical improvement design realizes the fully automated operation of the transformer oil online withstand voltage test device. The device does not require manual operation during the test process, which not only improves the detection efficiency but also reduces the risk of misoperation. The fully sealed oil sample management process ensures that the oil sample remains pure at each stage of extraction, testing and re-injection, greatly improving the accuracy and repeatability of the test data. At the same time, the intelligent design of the device also makes the oil sample detection process more environmentally friendly and economical, realizes efficient and low-loss oil sample circulation detection, and provides extremely practical and reliable technical support for the insulation performance detection of transformers.

[0044] As a further technical improvement, three oil extraction assembly terminals 308 are provided on the housing 2 of the automatic oil extraction device, so that the internal components of the device can be electrically connected in a more efficient and modular manner. The three oil extraction assembly terminals 308 are electrically connected to the oil pump 305, the solenoid valve 304 and the test unit, respectively, to ensure that each component receives the electrical signal independently and reliably and maintains stable operation during operation. The transformer oil withstand voltage tester 1 is provided with tester terminals 102 corresponding to the number of oil extraction components, and each terminal precisely corresponds to a specific component in the device. Through this design, the transformer oil withstand voltage tester 1 and the automatic oil extraction device can be electrically connected concisely and firmly using wires. This connection method simplifies the operator's connection process, especially in a field environment where frequent connection and disassembly are required. The operator only needs to connect the corresponding wire to the corresponding terminal to complete the electrical connection of the complex system. Each component is connected through an independent terminal, which makes the signal transmission in the system clearer and more stable, helps to improve the conduction effect between the test circuit and the components, and ensures that the operation of the equipment such as the oil pump 305 and the solenoid valve 304 and the operation of the withstand voltage test unit are synchronized and accurate.

[0045] As a further technical improvement, the housing 2 includes a housing body 200, and the housing body 200 is specially provided with an observation window 201 for observing the test unit, and the observation window 201 is arranged at the position of the housing 2 directly opposite the test unit. This design allows the operator to directly observe the state of the oil sample in the test unit, including the color, bubbles and other changes of the oil sample, and judge the oil quality or abnormal state during the test in real time, further ensuring the accuracy of the data and the safety of the test. By adding the observation window 201, the test equipment also provides a visual inspection method in addition to automated monitoring, providing the operator with a more intuitive monitoring experience and enhancing the convenience and safety of the device.

[0046] As a further technical improvement, a mounting plate 202 is added below the observation window 201 of the housing 2, and the test unit is firmly mounted on the mounting plate 202. A support member 203 is also provided at the lower part of the mounting plate 202, and the support member 203 is firmly connected to the housing 2 to provide additional support for the mounting plate 202. Through the reinforcement of the support member 203, the test unit is more firmly supported during the test, thereby maintaining the measurement accuracy. In addition, the setting of the mounting plate 202 and the support member 203 helps to extend the service life of the equipment, reduce the wear and tear that may be caused by the shaking of the components, and further improve the reliability and durability of the equipment.

[0047] Embodiment 2:

[0048] The difference from Example 1 is that, please refer to Figure 7-Figure 8 In this exemplary embodiment, the transformer oil withstand voltage tester 1 is separately provided from the automatic oil pumping device. In this technical improvement, the transformer oil withstand voltage tester 1 is separately provided from the automatic oil pumping device, forming a more flexible and modular design structure. Although the tester and the oil pumping device are two independent parts, they maintain cooperation through electrical connection. The transformer oil withstand voltage tester 1 is responsible for controlling the entire test process, providing power and control signals, and performing data acquisition and analysis; while the automatic oil pumping device is responsible for the extraction, testing and re-injection of oil samples. The separation of the two reduces the cost of the device. It is not necessary to install an integrated transformer oil online withstand voltage test device on each transformer to be tested. It is only necessary to install the automatic oil pumping device on each transformer to be tested. When testing is required, the transformer oil withstand voltage tester 1 is brought in and connected to the automatic oil pumping device through a wire to realize the electrical connection of the two devices and cooperate to complete the work, which can greatly reduce the cost of the device.

[0049] As a further technical improvement, the transformer oil withstand voltage tester 1 is equipped with a portable case 4, which is convenient for carrying and moving the transformer oil withstand voltage tester 1. The portable case 4 is composed of a box body 400 and a box cover 401, and the box cover 401 is connected to the box body 400 by a hinge to ensure that the box cover 401 can be flexibly opened and closed. The tester body 100 is firmly installed inside the box body 400, and the interactive panel 101 is located on the unclosed side of the box body 400, which is convenient for the operator to perform intuitive operation and data monitoring during use. This design allows the operator to easily operate the control panel without opening the entire box body 400, thereby improving the convenience of use. In order to ensure that the portable case 4 remains safe during carrying, two buckles 4011 are provided on the box cover 401. These buckles 4011 play a locking role when the box body 400 and the box cover 401 are closed, effectively preventing the box cover 401 from accidentally opening during movement, protecting the tester body 100 from the influence of the external environment when not in use, and avoiding the intrusion of foreign substances such as dust and water vapor.

[0050] The design of the portable case 4 not only improves the portability of the tester, but also provides good protection, allowing the tester to be used safely and conveniently in various working environments. Through the innovative design of the portable case 4, the storage, handling and on-site operation of the equipment have been significantly improved, ensuring the efficiency and reliability of the transformer oil withstand voltage tester 1

[0051] As a further technical improvement, a handle 4012 is added to the box cover 401 of the portable box 4, and the handle 4012 is arranged on the side of the box cover 401 away from the box body 400, so that the operator can carry and move it more easily. This design improves the practicality and convenience of the portable box 4, making it more convenient to carry and store the transformer oil withstand voltage tester 1 in different working environments, and further enhancing the portability of the device.

[0052] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A transformer oil online withstand voltage test device, characterized in that: The invention comprises a transformer oil withstand voltage tester (1) and an automatic oil pumping device, wherein the transformer oil withstand voltage tester (1) is provided with a test unit located in the automatic oil pumping device, the automatic oil pumping device is fixedly connected to the transformer to be tested and is connected to the oil pipe of the transformer to be tested, and the transformer oil withstand voltage tester (1) is electrically connected to the automatic oil pumping device.

2. The transformer oil online withstand voltage test device according to claim 1, characterized in that: The automatic oil pumping device comprises an automatic oil pumping assembly (3) and a housing (2). The automatic oil pumping assembly (3) is installed in the housing (2). The housing (2) is fixedly connected to the transformer to be tested. The automatic oil pumping assembly (3) comprises a connecting pipe (301), a test unit, a solenoid valve (304), an oil pump (305), an oil discharge pipeline (306) and an oil pumping pipeline (307). The test unit comprises a conductive column (303), an electrode (302) and an oil cup (300). There are two conductive columns (303) and they are electrically connected to the transformer oil withstand voltage tester (1). There are two electrodes (302) and they are electrically connected to the two conductive columns (303) respectively. The two conductive columns (303) are electrically connected to the transformer oil withstand voltage tester (1). The pole (302) is sealed and extends into the oil cup (300) and is arranged opposite to each other at a certain distance. The oil discharge pipe (306) is sealed and connected to the upper part of the oil cup (300) and extends out of the housing (2) to communicate with the oil filling pipe of the transformer to be tested. The connecting pipe (301) is sealed and connected to the lower part of the oil cup (300) and is connected to the oil pump (305). The oil extraction pipe (307) is sealed and connected to the upper part of the oil pump (305) and extends out of the housing (2) to communicate with the oil extraction pipe of the transformer to be tested. The oil pump (305) is fixed in the housing (2). The solenoid valve (304), the test unit and the oil pump (305) are electrically connected to the transformer oil withstand voltage tester (1).

3. The transformer oil online withstand voltage test device according to claim 2, characterized in that: The transformer oil withstand voltage tester (1) comprises a tester body (100), wherein the tester body (100) comprises a control unit, an interactive panel (101), a data processing unit, a test circuit and a power module, wherein the power module is used to provide a stable power supply for each part of the transformer oil withstand voltage tester (1) and the oil pump (305) and the solenoid valve (304) in the automatic oil pumping device, wherein the test unit is electrically connected to the test circuit, wherein the control unit is electrically connected to each part of the transformer oil withstand voltage tester and the oil pump (305) and the solenoid valve (304) in the automatic oil pumping device to control each unit to work in an orderly manner according to a preset program, and wherein the interactive panel (101) is arranged on the outer surface of the tester body (100).

4. The transformer oil online withstand voltage test device according to claim 3, characterized in that: The housing (2) is provided with oil pumping assembly terminals (308), the oil pumping assembly has a plurality of terminals and is electrically connected to the oil pump (305), the solenoid valve (304) and the test unit respectively, the transformer oil withstand voltage tester (1) is provided with a tester terminal (102) of the same number, and the transformer oil withstand voltage tester (1) is electrically connected to the automatic oil pumping device via a wire.

5. The transformer oil online withstand voltage test device according to claim 2, characterized in that: The housing (2) comprises a housing body (200), an observation window (201) is provided on the housing body (200), and the observation window (201) is arranged at a position of the housing (2) directly facing the test unit.

6. The transformer oil online withstand voltage test device according to claim 5, characterized in that: A mounting plate (202) is provided at the lower side of the observation window (201), the test unit is provided on the mounting plate (202), and a support member (203) is also provided at the lower part of the mounting plate (202), the support member (203) is fixedly connected to the housing (2) to provide support force for the mounting plate (202).

7. The transformer oil online withstand voltage test device according to claim 3, characterized in that: The transformer oil withstand voltage tester (1) is fixedly arranged on the automatic oil pumping device, and the interactive panel (101) in the transformer oil withstand voltage tester (1) is located at a side away from the transformer to be tested.

8. The transformer oil online withstand voltage test device according to claim 3, characterized in that: The transformer oil withstand voltage tester (1) is arranged separately from the automatic oil pumping device.

9. The transformer oil online withstand voltage test device according to claim 8, characterized in that: The transformer oil withstand voltage tester (1) further comprises a portable case (4), the portable case (4) comprising a case body (400) and a case cover (401), the case cover (401) being hinged on the case body (400), the tester body (100) being installed in the case body (400) and the interactive panel (101) being located on an unclosed side of the case body (400), and the case cover (401) being further provided with a plurality of buckles (4011) so as to lock the case body (400) and the case cover (401) when the case body (400) and the case cover (401) are closed.

10. The transformer oil online withstand voltage test device according to claim 9, characterized in that: The box cover (401) is also provided with a handle (4012), and the handle (4012) is arranged on a side of the box cover (401) facing away from the box body (400).

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