Oil paper insulation breakdown experiment device

Abstract

The utility model provides an oil paper insulation breakdown experiment device. An oil inlet and an oil outlet are formed in a box body, an insulating support is arranged in the box body, a fixing mechanism used for fixing oil paper is arranged on the insulating support, a first electrode and a second electrode are arranged above and below the oil paper respectively, transformer oil in the box body is heated through a heating mechanism, and the transformer oil in the box body is cooled through a refrigerating mechanism. And the controller is electrically connected with the heating mechanism and the refrigerating mechanism, and the controller is used for controlling the starting and stopping of the heating mechanism and the heating power and controlling the starting and stopping of the refrigerating mechanism and the refrigerating power, so that when the oil paper needs to be experimented, the oil paper is firstly fixed through the fixing mechanism, and then transformer oil is injected through the oil inlet; and then the transformer oil is heated or cooled according to requirements, so that the temperature of the transformer oil quickly simulates low-temperature and high-temperature operation conditions, and finally, the first electrode is connected with the high-voltage end, so that an experiment can be quickly carried out and observed.

Description

Technical Field

[0001] The utility model relates to the field of transformer manufacturing, in particular to an oil-paper insulation breakdown experimental device. Background Art

[0002] The oil-paper insulation breakdown test is an important experiment to study the insulation performance of the oil-paper combination under the action of the electric field. The experimental process is roughly as follows: Preparation stage: prepare the required oil-paper sample, electrode, insulating oil, high-voltage power supply, measuring instruments and other equipment. Installation stage: After determining the pole distance, place the oil-paper sample between the electrodes to ensure that the sample is in good contact with the electrode, and then inject insulating oil into the electrode gap so that the oil-paper sample is completely immersed in the oil. In the experimental stage, a gradually increasing voltage is applied to the electrode through a high-voltage power supply to observe and record the changes in the insulation performance of the oil-paper sample. When the voltage is applied to a certain extent, obvious light spots may be observed on the needle electrode, accompanied by a buzzing sound, and the insulating oil near the electrode begins to vibrate violently. When the voltage continues to increase, the oil-paper sample may experience partial discharge, and eventually a conductive channel is formed in the insulating structure, resulting in oil-paper breakdown. After the experiment, the experimental data is processed and analyzed to study the mechanism and influencing factors of oil-paper insulation breakdown.

[0003] However, as transformer products are sold to Northeast China, Xinjiang, Inner Mongolia and other regions with high cold and high heat and large temperature difference between day and night, the requirements for oil-paper insulation are getting higher and higher. However, the current oil-paper insulation breakdown test equipment cannot quickly simulate the corresponding environmental conditions. Therefore, there is an urgent need for an oil-paper insulation breakdown test device that can quickly simulate the corresponding environment. Utility Model Content

[0004] In view of this, an embodiment of the utility model provides an oil-paper insulation breakdown test device to quickly simulate the corresponding environment required for the oil-paper insulation breakdown test.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] An oil-paper insulation breakdown test device comprises: a box, a controller, a heating mechanism, a cooling mechanism, an insulation bracket, a fixing mechanism, a first electrode and a second electrode;

[0007] The box body is provided with an oil inlet and an oil outlet, the oil inlet is located at the upper part of the box body, and the oil outlet is located at the lower part of the box body;

[0008] The insulating bracket is arranged in the box;

[0009] The fixing mechanism is arranged on the insulating bracket, and the fixing mechanism is used for fixing the oil paper;

[0010] The first electrode and the second electrode are respectively arranged above and below the oil paper, the first electrode is used to be connected to the high voltage end, and the second electrode is used to be connected to the ground end;

[0011] The heating mechanism is used to heat the transformer oil in the box;

[0012] The refrigeration mechanism is used to cool the transformer oil in the box;

[0013] The controller is electrically connected to the heating mechanism and the cooling mechanism, and is used to control the start and stop of the heating mechanism and the heating power, and to control the start and stop of the cooling mechanism and the cooling power.

[0014] Preferably, the refrigeration mechanism comprises: a first-stage compressor, a cooler, a second-stage compressor, a condenser, an expansion valve, an evaporator and a refrigeration pipe;

[0015] The first stage compressor is connected to the inlet of the second stage compressor through the cooler, and the first stage compressor is used to compress the refrigerant into a first high temperature and high pressure gas and transport it to the cooler;

[0016] The cooler is used to cool the first high-temperature and high-pressure gas pressure and transport the cooled refrigerant to the second-stage compressor;

[0017] The outlet of the second-stage compressor is connected to the inlet of the evaporator through the condenser, and the second-stage compressor is used to compress the refrigerant into a second high-temperature and high-pressure gas and transport it to the condenser, wherein the temperature of the second high-temperature and high-pressure gas is greater than the temperature of the first high-temperature and high-pressure gas, and / or the pressure of the second high-temperature and high-pressure gas is greater than the pressure of the first high-temperature and high-pressure gas;

[0018] The expansion valve is arranged between the condenser and the evaporator;

[0019] The condenser is used to condense the second high-temperature and high-pressure gas into a high-pressure liquid, and transmit it to the evaporator through the expansion valve;

[0020] The refrigeration pipe is arranged in the box body, and one end of the refrigeration pipe is connected to the outlet of the evaporator. The evaporator is used to evaporate the high-pressure liquid into low-temperature gas and transport the low-temperature gas to the refrigeration pipe.

[0021] Preferably, the heating mechanism comprises: a heating wire;

[0022] The heating wires are arranged on the two side walls of the box body.

[0023] Preferably, the controller is a PLC.

[0024] Preferably, the insulating support is vertically provided with an electrode breakdown hole;

[0025] The fixing mechanism comprises: a first clamping member and a second clamping member;

[0026] The first clamping member and the second clamping member are respectively arranged on both sides of the electrode breakdown hole to fix the two ends of the oil paper respectively.

[0027] Preferably, the first clamping member and the second clamping member each include: a clamping plate, a bolt and a nut;

[0028] The insulating bracket is vertically provided with a first through hole for the bolt to pass through;

[0029] The clamping plate is arranged above the insulating bracket and connected to the upper end of the bolt;

[0030] The nut is arranged below the insulating bracket and matches with the thread of the bolt.

[0031] Preferably, the front side of the box body is a removable sealing plate;

[0032] The removable sealing plate is provided with a transparent observation window.

[0033] Preferably, it also includes: a temperature sensor;

[0034] The temperature sensor is arranged in the box and is connected to the controller for communication. The temperature sensor is used to monitor the temperature of the transformer oil in real time.

[0035] Preferably, the outer wall of the box is coated with thermal insulation paint.

[0036] Preferably, it also includes: a knob;

[0037] The knob can be rotatably arranged on the upper cover of the box body;

[0038] The upper cover is provided with a through hole for the first electrode to pass through;

[0039] The first electrode is provided with an external thread, and the inner wall of the knob is provided with an internal thread matching the external thread.

[0040] As can be seen from the above content, the utility model discloses an oil-paper insulation breakdown test device. An oil inlet and an oil outlet are arranged in a box body, the oil inlet is located at the upper part of the box body, the oil outlet is located at the lower part of the box body, an insulating bracket is arranged in the box body, a fixing mechanism for fixing the oil-paper is arranged on the insulating bracket, a first electrode and a second electrode are arranged above and below the oil-paper respectively, the first electrode is connected to the high-voltage end, the second electrode is connected to the ground end, a heating mechanism heats the transformer oil in the box body, and a refrigeration mechanism cools the transformer oil in the box body, a controller is electrically connected to the heating mechanism and the refrigeration mechanism, and the controller controls the start and stop of the heating mechanism and the heating power, and controls the start and stop of the refrigeration mechanism and the refrigeration power. Through the above disclosed oil-paper insulation breakdown test device, when it is necessary to conduct an experiment on the oil-paper, the oil-paper can be first fixed to the insulating bracket by the fixing mechanism and located between the first electrode and the second electrode, and then the transformer oil is injected through the oil inlet, and then the transformer oil is heated or cooled according to the demand, so that the temperature of the transformer oil can quickly simulate the low-temperature and high-temperature operation conditions, and finally the first electrode is connected to the high-voltage end, and the experiment and observation can be carried out. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0042] Figure 1 A schematic diagram of the structure of an oil-paper insulation breakdown test device provided by an embodiment of the utility model;

[0043] Figure 2 A schematic diagram of the structure of the components in the box provided by the embodiment of the utility model;

[0044] Figure 3 A schematic diagram of the structure of a fixing mechanism provided in an embodiment of the utility model;

[0045] Figure 4 A top view of a fixing mechanism provided in an embodiment of the utility model;

[0046] Figure 5 A control schematic diagram of an oil-paper insulation breakdown test device provided in an embodiment of the utility model.

[0047] Among them, there are a box body 1, an oil inlet 1-1, an oil outlet 1-2, a removable sealing plate 1-3, a transparent observation window 1-4, a controller 2, a heating mechanism 3, a refrigeration mechanism 4, an insulating bracket 5, an electrode breakdown hole 51, a first clamping member 61, a clamping plate 611, a bolt 612, a nut 613, a second clamping member 62, a first electrode 7, a second electrode 8, a temperature sensor 9, and a supporting leg 10. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0049] In this application, the terms "comprises", "comprising" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0050] The utility model provides an oil-paper insulation breakdown test device, see Figures 1 to 5 , Figure 1 The oil-paper insulation breakdown test device is a structural diagram, and the oil-paper insulation breakdown test device includes: a box 1, a controller 2, a heating mechanism 3, a cooling mechanism 4, an insulation bracket 5, a fixing mechanism, a first electrode 7 and a second electrode 8;

[0051] The box body 1 is provided with an oil inlet 1-1 and an oil outlet 1-2, the oil inlet 1-1 is located at the upper part of the box body 1, and the oil outlet 1-2 is located at the lower part of the box body 1;

[0052] The insulating bracket 5 is arranged in the box body 1;

[0053] The fixing mechanism is arranged on the insulating bracket 5, and the fixing mechanism is used to fix the oil paper;

[0054] The first electrode 7 and the second electrode are respectively arranged above and below the oil paper, the first electrode 7 is used to connect to the high voltage end, and the second electrode 8 is used to connect to the ground end;

[0055] The heating mechanism 3 is used to heat the transformer oil in the box 1;

[0056] The refrigeration mechanism 4 is used to cool the transformer oil in the box 1;

[0057] The controller 2 is electrically connected to the heating mechanism 3 and the cooling mechanism 4 , and is used to control the start and stop of the heating mechanism 3 and the heating power, and to control the start and stop of the cooling mechanism 4 and the cooling power.

[0058] It should be noted that when the temperature of the transformer oil needs to be increased, the heating mechanism 3 is controlled to be turned on by the controller 2, and the heating power is adjusted, so that the heating mechanism 3 can heat the transformer oil in the box 1. When the temperature of the transformer oil needs to be lowered, the transformer oil in the box 1 can be cooled by the refrigerator.

[0059] It should also be noted that the distance between the first electrode 7 and the second electrode 8 is set according to experimental requirements. Therefore, in the present application, the distance between the first electrode 7 and the second electrode 8 is not specifically limited.

[0060] In the embodiment of the utility model, an oil inlet 1-1 and an oil outlet 1-2 are arranged in a box body 1, the oil inlet 1-1 is located at the upper part of the box body 1, the oil outlet 1-2 is located at the lower part of the box body 1, an insulating bracket 5 is arranged in the box body 1, a fixing mechanism for fixing the oil paper is arranged on the insulating bracket 5, a first electrode 7 and a second electrode are arranged above and below the oil paper respectively, the first electrode 7 is connected to the high voltage end, the second electrode 8 is connected to the ground end, a heating mechanism 3 heats the transformer oil in the box body 1, a refrigeration mechanism 4 cools the transformer oil in the box body 1, a controller 2 is electrically connected to the heating mechanism 3 and the refrigeration mechanism 4, and the start and stop of the heating mechanism 3 and the heating power, as well as the start and stop and the cooling power of the refrigeration mechanism 4 are controlled by the controller 2. By means of the oil-paper insulation breakdown test device disclosed above, when it is necessary to conduct an experiment on the oil-paper, the oil-paper is first fixed to the insulating bracket 5 by a fixing mechanism and is located between the first electrode 7 and the second electrode 8, and then transformer oil is injected through the oil inlet 1-1, and then the transformer oil is heated or cooled as required, so that the temperature of the transformer oil can quickly simulate low-temperature and high-temperature operating conditions, and finally the first electrode 7 is connected to the high-voltage end, and then the experiment and observation can be carried out.

[0061] Specifically, the refrigeration mechanism 4 includes: a first-stage compressor, a cooler, a second-stage compressor, a condenser, an expansion valve, an evaporator and a refrigeration pipe;

[0062] The first stage compressor is connected to the inlet of the second stage compressor through the cooler, and the first stage compressor is used to compress the refrigerant into a first high temperature and high pressure gas and transport it to the cooler;

[0063] The cooler is used to cool the first high-temperature and high-pressure gas pressure and transport the cooled refrigerant to the second-stage compressor;

[0064] The outlet of the second-stage compressor is connected to the inlet of the evaporator through the condenser, and the second-stage compressor is used to compress the refrigerant into a second high-temperature and high-pressure gas and transport it to the condenser, wherein the temperature of the second high-temperature and high-pressure gas is greater than the temperature of the first high-temperature and high-pressure gas, and / or the pressure of the second high-temperature and high-pressure gas is greater than the pressure of the first high-temperature and high-pressure gas;

[0065] The expansion valve is arranged between the condenser and the evaporator;

[0066] The condenser is used to condense the second high-temperature and high-pressure gas into a high-pressure liquid, and transmit it to the evaporator through the expansion valve;

[0067] The refrigeration pipe is arranged in the box body 1, and one end of the refrigeration pipe is connected to the outlet of the evaporator. The evaporator is used to evaporate the high-pressure liquid into low-temperature gas and transport the low-temperature gas to the refrigeration pipe.

[0068] It should be noted that, through the above-disclosed refrigeration mechanism 4, since the present application adopts a two-stage compression refrigeration method for refrigeration, the temperature of the transformer oil can be effectively reduced to -50°C, thereby simulating an extremely cold temperature environment.

[0069] It is worth noting that the number of refrigeration pipes is multiple, which can further accelerate the oil temperature of the transformer oil in the box 1 to drop to the target temperature.

[0070] Further, the heating mechanism 3 comprises: a heating wire;

[0071] The heating wires are arranged on the two side walls of the box body 1 .

[0072] It should be noted that, by arranging heating wires on both side walls of the box body 1 , the transformer oil can be directly heated by the heating wires, thereby achieving rapid temperature increase of the transformer oil.

[0073] It should also be noted that the heating mechanism 3 may be a heating wire, an air heater, or other devices capable of heating transformer oil, and those skilled in the art may select the device according to their needs.

[0074] The heating mechanism 3 of the present application can be fixed to the top and bottom of the box by prying with bolts 612, thereby further accelerating the increase in the temperature of the transformer oil.

[0075] Specifically, the heating mechanism 3 and the refrigeration mechanism 4 of the present application have higher power and larger effective heat exchange area, and the time required to reduce from 20°C to -50°C or increase to 100°C is less than 4h. During the temperature change period, 6 temperature sensing contacts pre-buried in the box 1 are used to measure the real-time oil temperature and transmit the oil temperature information back to the control system, with a measurement accuracy of ±0.1°C. After reaching the specified temperature, the heating mechanism 3 and the refrigeration mechanism 4 will enter the insulation mode, and adjust the heating or cooling power in real time according to the oil temperature to ensure that the temperature remains unchanged during the set experimental time.

[0076] Specifically, the controller 2 is a PLC.

[0077] It should be noted that a programmable logic controller (PLC) is a digital computing electronic system designed specifically for use in industrial environments. It uses a programmable memory to store instructions for performing logical operations, sequential control, timing, counting and arithmetic operations, and controls various types of mechanical equipment or production processes through digital or analog input and output.

[0078] It should also be noted that the controller 2 can be a PLC, or other devices that can issue instructions to control the start and stop and heating power of the heating mechanism 3, and control the start and stop and cooling power of the refrigeration mechanism 4 (such as mobile phones, computers, handheld smart devices). Technical personnel in this field can choose according to needs.

[0079] Specifically, the insulating support 5 is vertically provided with an electrode breakdown hole 51;

[0080] The fixing mechanism comprises: a first clamping member 61 and a second clamping member 62;

[0081] The first clamping member 61 and the second clamping member 62 are respectively disposed on two sides of the electrode breakdown hole 51 to fix the two ends of the oil paper respectively.

[0082] It should be noted that the first clamping member 61 and the second clamping member 62 are respectively arranged on both sides of the electrode breakdown hole 51, and when the oil paper needs to be fixed, the first clamping member 61 and the second clamping member 62 can be used to fix the two ends of the oil paper respectively.

[0083] Further, the first clamping member 61 and the second clamping member 62 each include: a clamping plate 611, a bolt 612 and a nut 613;

[0084] The insulating bracket 5 is vertically provided with a first through hole for the bolt 612 to pass through;

[0085] The clamping plate 611 is disposed above the insulating bracket 5 and connected to the upper end of the bolt 612;

[0086] The nut 613 is disposed below the insulating bracket 5 and is threadably matched with the bolt 612 .

[0087] It should be noted that, by vertically providing a first through hole for the bolt 612 to pass through on the insulating bracket 5, and arranging the clamping plate 611 above the insulating bracket 5 and connected to the upper end of the bolt 612, and arranging the nut 613 below the insulating bracket 5 and threadedly cooperating with the bolt 612, when fixing the oil paper, one end of the oil paper can be placed between the clamping plate 611 and the insulating bracket 5, and then the nut 613 is rotated to make the nut 613 close to the clamping plate 611, so that the clamping plate 611 and the insulating bracket 5 cooperate to fix the end of the oil paper. After the experiment is completed, the nut 613 is rotated in the opposite direction, even if the nut 613 is away from the clamping plate 611, the oil paper can be taken out. The first clamping member 61 and the second clamping member 62 of the present application have a simple structure and are easy to operate, thereby improving the efficiency of the oil paper experiment.

[0088] Specifically, the front of the box body 1 is a removable sealing plate 1-3;

[0089] The removable sealing plate 1-3 is provided with a transparent observation window 1-4.

[0090] It should be noted that, by providing a detachable sealing plate 1-3 on the front of the box body 1 and providing a transparent observation window 1-4 on the detachable sealing plate 1-3, it is convenient for experimenters to observe the paper insulation breakdown experiment process in real time.

[0091] Preferably, the observation window is made of tempered glass.

[0092] It should be noted that the observation window can be made of tempered glass, acrylic, or other transparent materials, and those skilled in the art can choose according to needs.

[0093] The front of the box body 1 is provided with a detachable sealing plate 1-3, and when the oil paper needs to be fixed, the front of the box body 1 can be removed, which can facilitate the experimenter to operate the fixing mechanism to fix the oil paper, thereby improving the experiment efficiency.

[0094] Furthermore, the oil-paper insulation breakdown test device further comprises: a temperature sensor 9;

[0095] The temperature sensor 9 is arranged in the box body 1 and is connected to the controller 2 for communication. The temperature sensor 9 is used for monitoring the temperature of the transformer oil in real time.

[0096] It should be noted that, by providing a temperature sensor 9, and providing the temperature sensor 9 in the box body 1, and communicating with the controller 2, the temperature of the transformer oil can be monitored in real time through the temperature sensor 9, and the monitored temperature data can be fed back to the controller 2. The controller 2 controls the start and stop and heating power of the heating mechanism 3, and controls the start and stop and cooling power of the refrigeration mechanism 4 according to the experimental requirements, to ensure that the temperature of the transformer oil is at the simulated ambient temperature, thereby further ensuring the accuracy of the experimental data.

[0097] Preferably, there are multiple temperature sensors 9.

[0098] The number of temperature sensors 9 is set to be multiple, and the multiple temperature sensors 9 are set at different positions of the box body 1, such as circumferentially, so that the temperature of the transformer oil at different positions in the box body 1 can be monitored in real time by the multiple temperature sensors 9.

[0099] Furthermore, the outer wall of the box body 1 is coated with a thermal insulation coating.

[0100] It should be noted that by applying thermal insulation paint on the outer wall of the box 1 and reducing the thermal conductivity of the box 1, it is possible to avoid the external temperature from affecting the temperature of the transformer oil in the box 1, thereby effectively suppressing the loss of heat and cold in the box 1 and creating a stable test environment.

[0101] Preferably, the temperature resistance range of the thermal insulation coating is -80°C-1800°C.

[0102] Furthermore, the oil-paper insulation breakdown test device further includes: a knob (not shown in the figure);

[0103] The knob can be rotated to set the upper cover of the box body 1;

[0104] The upper cover is provided with a second through hole for the first electrode 7 to pass through;

[0105] The first electrode 7 is provided with an external thread, and the inner wall of the knob is provided with an internal thread matching the external thread.

[0106] It should be noted that the knob is rotatably arranged on the upper cover of the box body 1, and a second through hole for the first electrode 7 to pass through is opened on the upper cover, an external thread is arranged on the first electrode 7, and an internal thread matching the external thread is arranged on the inner wall of the knob, so that when the knob is turned, the height of the first electrode 7 can be adjusted, thereby realizing the adjustment of the distance between the first electrode 7 and the second electrode 8 to meet different experimental requirements.

[0107] Preferably, a plurality of supporting legs 10 are provided at the bottom of the box body 1 .

[0108] Preferably, the supporting leg 10 is made of insulating material.

[0109] Based on the technical solution provided in the above embodiment, the following provides steps for using an oil-paper insulation breakdown test device.

[0110] 1. Clean the box 1 before use.

[0111] 2. Set PLC instructions according to experimental requirements.

[0112] 3. Open the detachable panel, take out the insulating oil paper bracket (i.e., insulating bracket 5), and fix the insulating oil paper for the experiment on the insulating oil paper bracket.

[0113] 4. Place the bracket into the box 1, reinstall the removable panel and ensure it is sealed securely.

[0114] 5. Inject experimental transformer oil at room temperature from the oil filling port until the box 1 is full.

[0115] 6. The PLC issues a heating or cooling command, and the refrigeration device or heating device starts to operate.

[0116] 7. After reaching the specified temperature, the PLC issues a heat preservation instruction, and the cooling and heating equipment work at the same time, so that the heat loss and absorption reach a balance.

[0117] 8. Use the upper knob to adjust the distance between the first electrode 7 and the second electrode 8 to the required distance for the experiment.

[0118] 9. Conduct experiments.

[0119] 10. After the experiment, the PLC issues a shutdown command and the cooling and heating equipment stops working.

[0120] 11. Drain the oil through the oil drain port.

[0121] 12. Disassemble the panel again, take out the insulating oil paper bracket, take out the insulating oil paper for the experiment, clean the inside of the equipment and then reinstall the panel.

[0122] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An oil-paper insulation breakdown test device, characterized in that: include: A box, a controller, a heating mechanism, a cooling mechanism, an insulating bracket, a fixing mechanism, a first electrode and a second electrode; The box body is provided with an oil inlet and an oil outlet, the oil inlet is located at the upper part of the box body, and the oil outlet is located at the lower part of the box body; The insulating bracket is arranged in the box; The fixing mechanism is arranged on the insulating bracket, and the fixing mechanism is used to fix the oil paper; The first electrode and the second electrode are respectively arranged above and below the oil paper, the first electrode is used to be connected to the high voltage end, and the second electrode is used to be connected to the ground end; The heating mechanism is used to heat the transformer oil in the box; The refrigeration mechanism is used to cool the transformer oil in the box; The controller is electrically connected to the heating mechanism and the cooling mechanism, and is used to control the start and stop of the heating mechanism and the heating power, and to control the start and stop of the cooling mechanism and the cooling power.

2. The oil-paper insulation breakdown test device according to claim 1 is characterized in that: The refrigeration mechanism comprises: a first-stage compressor, a cooler, a second-stage compressor, a condenser, an expansion valve, an evaporator and a refrigeration pipe; The first stage compressor is connected to the inlet of the second stage compressor through the cooler, and the first stage compressor is used to compress the refrigerant into a first high-temperature and high-pressure gas and deliver it to the cooler; The cooler is used to cool the first high-temperature and high-pressure gas and transport the cooled refrigerant to the second-stage compressor; The outlet of the second-stage compressor is connected to the inlet of the evaporator through the condenser, and the second-stage compressor is used to compress the refrigerant into a second high-temperature and high-pressure gas and transport it to the condenser, wherein the temperature of the second high-temperature and high-pressure gas is greater than the temperature of the first high-temperature and high-pressure gas, and / or the pressure of the second high-temperature and high-pressure gas is greater than the pressure of the first high-temperature and high-pressure gas; The expansion valve is arranged between the condenser and the evaporator; The condenser is used to condense the second high-temperature and high-pressure gas into a high-pressure liquid, and transport it to the evaporator through the expansion valve; The refrigeration pipe is arranged in the box body, and one end of the refrigeration pipe is connected to the outlet of the evaporator. The evaporator is used to evaporate the high-pressure liquid into low-temperature gas and transport the low-temperature gas to the refrigeration pipe.

3. The oil-paper insulation breakdown test device according to claim 1 is characterized in that: The heating mechanism comprises: a heating wire; The heating wires are arranged on two side walls of the box.

4. The oil-paper insulation breakdown test device according to claim 1 is characterized in that: The controller is a PLC.

5. The oil-paper insulation breakdown test device according to claim 1, characterized in that: The insulating support is vertically provided with an electrode breakdown hole; The fixing mechanism comprises: a first clamping member and a second clamping member; The first clamping member and the second clamping member are respectively arranged on both sides of the electrode breakdown hole to fix the two ends of the oil paper respectively.

6. The oil-paper insulation breakdown test device according to claim 5, characterized in that: The first clamping member and the second clamping member each include: a clamping plate, a bolt and a nut; The insulating bracket is vertically provided with a first through hole for the bolt to pass through; The clamping plate is arranged above the insulating bracket and connected to the upper end of the bolt; The nut is arranged below the insulating bracket and cooperates with the bolt thread.

7. The oil-paper insulation breakdown test device according to claim 1, characterized in that: The front side of the box body is a removable sealing plate; The detachable sealing plate is provided with a transparent observation window.

8. The oil-paper insulation breakdown test device according to claim 1 is characterized in that: Also includes: Temperature sensor; The temperature sensor is arranged in the box and is in communication connection with the controller. The temperature sensor is used for monitoring the temperature of the transformer oil in real time.

9. The oil-paper insulation breakdown test device according to claim 1, characterized in that: The outer wall of the box is coated with thermal insulation paint.

10. The oil-paper insulation breakdown test device according to claim 1, characterized in that: Also includes: Knob; The knob is rotatably arranged on the upper cover of the box; The upper cover is provided with a through hole for the first electrode to pass through; The first electrode is provided with an external thread, and the inner wall of the knob is provided with an internal thread matching the external thread.

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