Full-automatic constant-temperature dielectric strength tester for insulating oil

Abstract

The utility model discloses a full-automatic constant-temperature insulating oil dielectric strength tester which comprises a tester main body, a heat preservation oil cup shell is arranged on the end portion of the tester main body in a lifting mode, and electrode butt joint seats which are inserted into electrode pieces contained on the tester main body in a lifting mode are symmetrically arranged at the bottom end of the outer portion of the heat preservation oil cup shell. Through cooperative work of the heating copper plate, the oil cover plate with the stirring function, the heat preservation plate layer and the constant-temperature sensor, accurate temperature control and uniform heating in the insulating oil heating process are achieved, the problem of uneven temperature in a traditional heating mode is solved, the consistency and accuracy of detection results are fundamentally guaranteed, a reliable temperature environment basis is provided for dielectric strength testing, and the test efficiency is improved. The lifting air cylinder is used for driving the heat preservation oil cup shell, the electrode butt joint base and the electrode butt joint inserting block are matched with the automatic butt joint inserting design, the defects of manual assistance or a simple mechanical structure are completely overcome, the automation degree, accuracy and stability of electrode connection are greatly improved, and data fluctuation caused by poor contact is effectively avoided.

Description

Technical Field

[0001] This utility model belongs to the technical field of dielectric strength testers, specifically relating to a fully automatic constant temperature insulating oil dielectric strength tester. Background Technology

[0002] In the field of power equipment operation and maintenance, insulating oil dielectric strength testing is a crucial link in ensuring the safety and stability of the power grid. With the advancement of smart grid construction, the requirements for the automation and accuracy of testing equipment are constantly increasing. Existing technologies, such as the insulating oil dielectric strength tester involved in patent CN213633691U, while achieving some breakthroughs in automated testing, have revealed many shortcomings in practical applications. The traditional heating method used in this equipment is insufficient to meet the stringent requirements for temperature uniformity and accuracy in insulating oil testing. The lack of a stirring structure causes temperature differences in the oil during heating, affecting the consistency of test results. Electrode connection relies on manual assistance or simple mechanical structures, resulting in low automation and a tendency for poor contact during frequent testing, leading to data fluctuations. Utility Model Content

[0003] The purpose of this invention is to provide a fully automatic constant temperature insulating oil dielectric strength tester to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a fully automatic constant-temperature insulating oil dielectric strength tester, comprising:

[0005] The main body of the tester has a heat-insulating oil cup shell that is raised and lowered at the end of the main body to keep the insulating oil at a constant temperature during the test. The end of the heat-insulating oil cup shell is sealed with an oil cover plate that stirs and heats the insulating oil evenly when it is heated to a constant temperature. The bottom of the outer side of the heat-insulating oil cup shell is symmetrically provided with electrode docking seats that are raised and lowered to insert into the electrode components contained on the main body of the tester.

[0006] The testing oil cup is fixedly installed at the bottom of the inner shell of the insulating oil cup. The outer sides of the testing oil cup are provided with heating copper plates with heating wires to heat the insulating oil to a constant temperature during testing. The inner sides of the testing oil cup are provided with test electrode rods that penetrate to the bottom of the insulating oil cup shell and are connected to the electrode docking seat.

[0007] Preferably, the main body of the tester is provided with protective plates on both sides, and the center of the end of the protective plate is provided with an installation groove. Each installation groove is provided with a lifting cylinder that connects to the bottom ends of the outer shell of the insulated oil cup. This facilitates the precise insertion of the electrode docking seat and the electrode docking plug, improves the automation of electrode connection, avoids poor contact problems caused by manual assistance, and reduces data fluctuations.

[0008] Preferably, both sides of the main body of the tester are provided with electrode docking blocks that are perpendicular to the electrode docking seat. After the electrode docking seat is lowered, the electrode docking blocks are inserted into the electrode docking blocks to enable the test electrode rod to test the dielectric strength of the insulating oil. After the outer shell of the heat preservation oil cup is lowered, the electrodes are automatically inserted to enable the test electrode rod to successfully test the dielectric strength of the insulating oil, ensuring stable and accurate electrode connection and improving test reliability.

[0009] Preferably, a motor is provided at the center of the upper end of the oil cover plate, and the motor shaft extends through to the lower end of the oil cover plate and is connected to a stirring shaft with a structure for uniformly heating and stirring the insulating oil. A heater is provided on one side of the motor, which is connected to and cooperates with the heating copper plate to heat the insulating oil in the test oil cup to a suitable test temperature. The heater and the heating copper plate work together to make the temperature of the insulating oil uniform during the heating process, which solves the problem of uneven temperature in traditional heating methods and ensures the consistency of test results.

[0010] Preferably, one side of the testing oil cup is connected to an oil extraction pipe that extends to the outside of the insulation oil cup shell. The outside of the insulation oil cup shell is provided with an oil inlet pipe that extends to the upper side of the testing oil cup. Both the oil extraction pipe and the oil inlet pipe are equipped with valve bodies. The oil extraction pipe and the oil inlet pipe connected to the testing oil cup, together with the valve bodies, facilitate quick and easy replacement of insulating oil, thereby improving the ease of use and testing efficiency of the equipment.

[0011] Preferably, the main body of the tester has a built-in PLC controller, and the PLC controller is connected to the motor group, sensor, air pump, cylinder and heating components in the tester to realize the full automation of the testing process, accurately control the coordinated work of each component, and improve the testing efficiency and data reliability.

[0012] Preferably, the inner side of the insulated oil cup shell is provided with an insulation board layer and a constant temperature sensor for monitoring the temperature of the insulating oil is provided on one side of the bottom of the oil cover plate. The insulation board layer on the inner side of the insulated oil cup shell reduces heat loss, and the constant temperature sensor monitors the temperature of the insulating oil in real time. In conjunction with the heating copper plate and the heater, precise constant temperature control is achieved, which meets the requirements of the insulating oil detection for temperature uniformity and accuracy.

[0013] Preferably, the upper end of one side of the inner side of the insulating oil cup shell is equipped with a vacuum pump for evacuating the insulating oil during the testing after the insulating oil cup shell is sealed by the oil cover plate. The pipe at the outlet of the vacuum pump extends to the outside of the insulating oil cup shell and is equipped with a sealing valve. The vacuum pump inside the insulating oil cup shell evacuates the vacuum after the oil cover plate is sealed, eliminating interference factors such as air bubbles in the testing environment, creating a pure environment for the dielectric strength testing of insulating oil, and improving the testing accuracy.

[0014] Compared with the prior art, the technical effects and advantages of this utility model are as follows:

[0015] Precise temperature control and uniform heating: By working together with a heating copper plate, an oil cover plate with stirring function, an insulation layer and a constant temperature sensor, precise temperature control and uniform heating are achieved during the heating process of insulating oil. This solves the problem of uneven temperature in traditional heating methods, fundamentally ensuring the consistency and accuracy of test results and providing a reliable temperature environment for dielectric strength testing.

[0016] Automated electrode docking: The lifting cylinder drives the insulated oil cup shell, and the automatic docking design of the electrode docking seat and electrode docking plug completely eliminates the drawbacks of manual assistance or simple mechanical structures, greatly improves the automation, accuracy and stability of electrode connection, effectively avoids data fluctuations caused by poor contact, and significantly enhances the reliability and stability of testing.

[0017] Intelligent integrated automated control: The PLC controller integrates and controls the motor unit, sensors, air pump, cylinder, and heating components to achieve full automation of the testing process. Precise coordination of the work of each component not only improves testing efficiency but also reduces human error and ensures high reliability of test data through automated data acquisition and processing.

[0018] Optimized testing environment and convenient operation: The vacuum pump creates a vacuum during testing, eliminating interference factors such as air bubbles, thus creating a pure environment for insulating oil dielectric strength testing and improving testing accuracy; the oil extraction pipe and oil inlet pipe, together with the valve body, facilitate quick and easy replacement of insulating oil, optimize the equipment usage process, and further improve the ease of use of the equipment and overall testing efficiency. Attached Figure Description

[0019] Figure 1 This is the front view of the constant temperature insulating oil dielectric strength tester of this utility model;

[0020] Figure 2 This is a top view of the main body of the testing instrument of this utility model;

[0021] Figure 3 This is a top view of the outer shell of the insulated oil cup of this utility model;

[0022] Figure 4 This is a bottom view of the outer shell of the insulated oil cup of this utility model;

[0023] Figure 5 This is a top view of the oil cup used in this invention.

[0024] In the diagram: 1. Main body of the tester; 2. Insulated oil cup shell; 3. Oil cover plate; 4. Detection oil cup; 5. Heating copper plate; 6. Test electrode rod; 7. Electrode docking seat; 8. Protective plate; 9. Mounting groove; 10. Lifting cylinder; 11. Electrode docking block; 12. Motor; 13. Stirring shaft; 14. Heater; 15. Oil extraction pipe; 16. Oil inlet pipe; 17. Insulation plate layer; 18. Constant temperature sensor; 19. Vacuum pump. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Please see Figure 1-5 This utility model provides a technical solution: a fully automatic constant temperature insulating oil dielectric strength tester, comprising:

[0027] The main body 1 of the tester serves as the core carrier of the entire device, integrating key functional modules such as control, power supply, and data processing. Its end utilizes a precision mechanical structure to achieve the lifting and lowering of the insulating oil cup shell 2. This structural design ensures the stability and accuracy of the insulating oil cup shell 2 during lifting, thereby guaranteeing that the insulating oil remains at a constant temperature during testing. The end of the insulating oil cup shell 2 is sealed with an oil cover plate 3, which stirs and heats the insulating oil evenly when it reaches a constant temperature. A high-precision sealing technology is used between the oil cover plate 3 and the insulating oil cup shell 2 to effectively prevent heat loss and the entry of external impurities. During heating, the stirring and heating function of the oil cover plate 3 ensures more uniform heating of the insulating oil. Symmetrically arranged electrode docking seats 7 are located on the bottom of the outer surface of the insulating oil cup shell 2, allowing for the lifting and insertion of electrodes on the main body 1. The symmetrical distribution of the electrode docking seats 7, combined with a high-precision guiding structure, ensures the accuracy and stability of the insertion of electrodes with the main body 1.

[0028] The testing oil cup 4 is made of high-strength, high-temperature resistant, and excellent insulating material. It is fixedly installed at the bottom inside the insulating oil cup shell 2, providing a stable testing space for the insulating oil. Heating copper plates 5 with heating wires are located on both sides of the outer surface of the testing oil cup 4. These plates are tightly bonded to the testing oil cup 4 using a highly efficient thermally conductive material. The heating wires are evenly distributed within the copper plates using a special winding process, ensuring uniform heat transfer to the testing oil cup 4. Test electrode rods 6 are located on both sides of the inner surface of the testing oil cup 4, extending to the bottom of the insulating oil cup shell 2 and connecting to the electrode docking seat 7. The material of the test electrode rods 6 undergoes special treatment, exhibiting good conductivity and corrosion resistance. Their through-hole design, combined with a sealing structure, ensures both the reliability of the circuit connection and prevents insulating oil leakage.

[0029] The main body 1 of the tester is provided with protective plates 8 on both sides. The protective plates 8 not only protect the internal structure of the main body 1 of the tester, but also provide installation support for the lifting cylinders 10. The center of the end of the protective plate 8 is provided with a mounting groove 9, and each mounting groove 9 is provided with a lifting cylinder 10 that connects to the bottom ends of the insulated oil cup shell 2. The lifting cylinder 10 adopts a high-precision air pressure control system. By accurately controlling the air pressure magnitude and direction, it realizes the smooth and rapid lifting action of the insulated oil cup shell 2, which facilitates the precise insertion of the electrode docking seat 7 and the electrode docking plug 11.

[0030] Both sides of the main body 1 of the tester are provided with electrode docking blocks 11 that are perpendicular to the electrode docking seat 7. The vertical correspondence between the electrode docking blocks 11 and the electrode docking seat 7, combined with a high-precision positioning sensor, ensures that after the electrode docking seat 7 is lowered, the two can be quickly and accurately inserted, so that the test electrode rod 6 can be connected to the external circuit, thereby testing the dielectric strength of the insulating oil.

[0031] A motor 12 is located at the center of the upper end of the oil cover plate 3. The motor 12 is a high-torque, low-noise servo motor to ensure stable and efficient operation of the stirring shaft 13. The end of the motor 12 shaft extends to the lower end of the oil cover plate 3 and is connected to the stirring shaft 13, which has a structure for uniformly heating and stirring the insulating oil. The stirring structure on the stirring shaft 13 uses a special blade shape and arrangement, which, driven by the motor 12, can generate a highly efficient stirring flow field, so that the insulating oil is fully mixed during the heating process and the temperature is uniformly distributed. A heater 14 is located on one side of the motor 12, which is connected to the heating copper plate 5 to heat the insulating oil in the detection oil cup 4 to a suitable detection temperature. The heater 14 has an intelligent temperature regulation function and can accurately control the heating power based on the data fed back by the constant temperature sensor 18. It works in conjunction with the heating copper plate 5 to achieve precise heating of the insulating oil.

[0032] One side of the testing oil cup 4 is connected to an oil extraction pipe 15 that extends to the outside of the insulating oil cup shell 2. The outside of the insulating oil cup shell 2 is provided with an oil inlet pipe 16 that extends to the upper end of the testing oil cup 4. Both the oil extraction pipe 15 and the oil inlet pipe 16 are equipped with valve bodies. Both the oil extraction pipe 15 and the oil inlet pipe 16 are made of oil-resistant and corrosion-resistant materials. The valve body is a high-precision solenoid valve, and its opening and closing are controlled by a PLC controller to achieve automatic extraction and injection of insulating oil, facilitating sample replacement before and after testing.

[0033] The main body 1 of the testing instrument has a built-in PLC controller. As the main controller of the entire device, the PLC controller adopts a high-performance central processing unit and rich input / output interfaces, and is connected to the motor group, sensors, air pump, cylinders, and heating components in the testing instrument. Through the preset control program, the PLC controller can accurately coordinate the working sequence and operating parameters of each component to achieve fully automated control of the testing process.

[0034] The inner side of the insulated oil cup shell 2 is provided with an insulation board layer 17. The insulation board layer 17 is made of multi-layer composite insulation material, which has excellent thermal insulation performance, effectively reducing heat loss and maintaining stable internal temperature. Furthermore, a constant temperature sensor 18 for monitoring the temperature of the insulating oil is provided on one side of the bottom of the oil cover plate 3. The constant temperature sensor 18 is a high-precision, fast-response temperature sensor that can monitor the temperature of the insulating oil in real time and accurately, and feed the data back to the PLC controller, providing a basis for temperature control.

[0035] The upper part of one side of the inner side of the insulated oil cup shell 2 is equipped with a vacuum pump 19 for evacuating the insulating oil during testing after the insulated oil cup shell 2 is sealed by the oil cover plate 3. The vacuum pump 19 adopts efficient vacuum pumping technology and has strong pumping capacity and stable working performance. The pipe at the outlet end of the vacuum pump 19 extends to the outside of the insulated oil cup shell 2 and is equipped with a sealing valve. The sealing valve ensures that the pipe is sealed when the vacuum pump 19 is working to prevent outside air from entering. After the test is completed, it can be opened to release gas, ensuring that the vacuum level of the test environment meets the requirements.

[0036] Specifically, during use, after the tester is started, the PLC controller, as the core control unit, coordinates the operation of each component according to the preset program. The valve on the oil inlet pipe opens, and insulating oil is injected into the test oil cup 4. Then, the oil cover plate 3 seals and closes the heat-insulating oil cup shell 2. The lifting cylinder 10 on the protective plate 8 drives the heat-insulating oil cup shell 2 to descend, so that the electrode docking seat 7 and the electrode docking plug 11 at the end of the tester body 1 can be precisely aligned, completing the circuit connection of the test electrode rod 6. At this time, the motor 12 drives the stirring shaft 13 to rotate, and the heater 14 and the heating copper plate 5 cooperate to heat the insulating oil. The constant temperature sensor 18 monitors the oil temperature in real time and feeds it back to the PLC controller to realize closed-loop temperature control. After the insulating oil reaches the set temperature and the temperature is uniform, the vacuum pump 19 starts to evacuate the vacuum, eliminating the interference of air bubbles in the test environment. Finally, voltage is applied to the test electrode rod 6 to test the dielectric strength of the insulating oil. The test data is collected, analyzed and stored by the PLC controller.

[0037] Initial heating: After the heater 14 is powered on, it heats the insulating oil in the oil cup 4 through the heating wire on the heating plate 5. At the same time, the motor 12 drives the stirring shaft 13 to rotate, stirring the insulating oil to promote uniform heat transfer, avoid local overheating or overcooling, and accelerate the heating rate.

[0038] Temperature monitoring and control: The constant temperature sensor 18 at the bottom of the oil cover plate 3 continuously monitors the temperature of the insulating oil and transmits the data to the PLC controller in real time. When the detected temperature is lower than the set value, the PLC controller controls the heater 14 to increase its power; if the temperature is higher than the set value, the heater power is reduced or heating is stopped. Through this dynamic control method, the temperature of the insulating oil is maintained within the set constant temperature range.

[0039] Insulation Maintenance: The insulation board layer 17 inside the outer shell 2 of the insulation oil cup effectively reduces heat loss. Combined with the precise control of the heating system by the PLC controller, the insulation oil is kept at a constant temperature throughout the entire testing process, ensuring that the dielectric strength test is carried out under stable temperature conditions, and guaranteeing the accuracy and reliability of the test results.

[0040] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A fully automatic constant-temperature insulating oil dielectric strength tester, characterized in that, include: The main body of the tester (1) has a heat-insulating oil cup shell (2) at the end of the tester (1) which is used to keep the insulating oil at a constant temperature during the test. The end of the heat-insulating oil cup shell (2) is sealed with an oil cover plate (3) which has the function of stirring and heating the insulating oil evenly when it is heated to a constant temperature. The bottom of the outer side of the heat-insulating oil cup shell (2) is symmetrically provided with electrode docking seats (7) that are raised and lowered to fit the electrode components contained on the main body of the tester (1). The test oil cup (4) is fixedly installed at the bottom inside the outer shell (2) of the heat-insulating oil cup. The outer sides of the test oil cup (4) are provided with heating copper plates (5) with heating wires to heat the insulating oil to a constant temperature during the test. The inner sides of the test oil cup (4) are provided with test electrode rods (6) that penetrate to the bottom of the outer shell (2) of the heat-insulating oil cup and are connected to the electrode docking seat (7).

2. The fully automatic constant temperature insulating oil dielectric strength tester according to claim 1, characterized in that: The main body (1) of the tester is provided with protective plates (8) on both sides. The center of the end of the protective plate (8) is provided with a mounting groove (9), and each mounting groove (9) is provided with a lifting cylinder (10) connected to the bottom ends of the heat-insulating oil cup shell (2).

3. The fully automatic constant temperature insulating oil dielectric strength tester according to claim 1, characterized in that: The tester body (1) has electrode docking blocks (11) on both sides of its end that are perpendicular to the electrode docking seat (7). After the electrode docking seat (7) is lowered, the electrode docking blocks (11) are inserted into it so that the test electrode rod (6) can test the dielectric strength of the insulating oil.

4. The fully automatic constant temperature insulating oil dielectric strength tester according to claim 1, characterized in that: A motor (12) is provided at the center of the upper end of the oil cover plate (3), and the shaft end of the motor (12) passes through to the lower end of the oil cover plate (3) and is connected to a stirring shaft (13) with a structure for heating and stirring the insulating oil evenly. A heater (14) is provided on one side of the motor (12) to heat the insulating oil in the detection oil cup (4) to a suitable detection temperature by connecting and cooperating with the heating copper plate (5).

5. The fully automatic constant temperature insulating oil dielectric strength tester according to claim 1, characterized in that: One side of the detection oil cup (4) is connected to an oil extraction pipe (15) that extends through to the outside of the outer shell (2) of the insulated oil cup. The outer side of the outer shell (2) of the insulated oil cup is provided with an oil inlet pipe (16) that extends through to the upper side of the detection oil cup (4). A valve body is provided on the oil extraction pipe (15) and the oil inlet pipe (16).

6. The fully automatic constant temperature insulating oil dielectric strength tester according to claim 1, characterized in that: The main body (1) of the tester has a built-in PLC controller, and the PLC controller is connected to the motor group, sensor, air pump, cylinder and heating component in the tester.

7. The fully automatic constant temperature insulating oil dielectric strength tester according to claim 1, characterized in that: The inner side of the outer shell (2) of the insulated oil cup is provided with an insulation board layer (17), and a constant temperature sensor (18) for monitoring the temperature of the insulating oil is provided on one side of the bottom end of the oil cover plate (3).

8. The fully automatic constant temperature insulating oil dielectric strength tester according to claim 1, characterized in that: The upper part of one side of the inner side of the heat-insulating oil cup shell (2) is provided with a vacuum pump (19) for evacuating the insulating oil after the heat-insulating oil cup shell (2) is sealed by the oil cover plate (3). The pipe of the outlet end of the vacuum pump (19) extends to the outside of the heat-insulating oil cup shell (2) and is equipped with a sealing valve.

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