Accelerated degradation test device and method for insulating material of high-voltage oil-filled cable terminal

Abstract

The invention provides an accelerated degradation test device and method for an insulating material of a high-voltage oil-filled cable terminal, researches, designs and simulates a detachable high-voltage cable oil-filled terminal and a matched monitoring device, and creates an oil-filled terminal inner cavity environment with voltage, current, temperature and pressure higher than normal operation voltage, current, temperature and pressure and high humidity, high temperature and high oxygen through manual adjustment. And the surface temperature and pressure change conditions of the stress cone are monitored across the air, so that accelerated degradation and damage tests can be carried out in a short time, the damage conditions of other component structures in the oil-filled terminal can be detected in time, and the defect that the prior art cannot test the oil-filled terminal of a high-voltage cable, especially high voltage and ultrahigh voltage of 220kV and above, and the like is overcome. The device can effectively monitor and screen products and suppliers such as a stress cone, an insulation wrapping tape, insulation paint, other insulation assemblies and a conducting rod in an extra-high voltage cable oil-filled terminal, and has important significance for ensuring safe operation of the high voltage cable oil-filled terminal in reality.

Description

Technical Field

[0001] The present invention relates to the technical field of power high-voltage cable equipment monitoring, in particular to an accelerated degradation test device and method for high-voltage oil-filled cable terminal insulation materials. Background Art

[0002] The high-voltage cable oil-filled terminal operates under high voltage and high current; the internal installation of the oil-filled terminal: conductive rod, stress cone, epoxy insulation, wrapped insulation tape, insulating oil. After the high-voltage cable oil-filled terminal is manufactured and assembled, it should be kept strictly sealed and operate for a long time under high voltage and high current environment. During this period, its inner cavity cannot be opened for inspection. The inner cavity of the high-voltage cable oil-filled terminal is installed with: conductive rod, stress cone wrapped by the insulating shielding layer of the conductive rod joint. The stress cone is made of composite silicone rubber material. As an important component of the oil-filled terminal, the stress cone plays an important role in improving the electric field distribution at the end of the metal sheath, reducing the electric field strength at the edge of the metal sheath, and balancing the electric field stress of the conductive rod in the terminal cavity. Since the stress cone is in contact with the insulating shielding layer of the conductive rod joint, it is affected by the high current heating of the conductive rod. The oil-filled terminal is large, and its manufacturing materials and processes are strictly required. The inner cavity of the oil-filled terminal also has fixed epoxy insulation parts, wrapped insulating tape, filled insulating oil, and insulating paint painted on the inner wall. In long-term operation, ensuring the stability of the stress cone and other solid insulating materials and insulating oil quality in the inner cavity of the high-voltage cable oil-filled terminal is a vital guarantee for ensuring the safe operation of the high-voltage cable. However, if the manufacturer chooses unqualified stress cones, inferior solid insulating materials and insulating oils, or the manufacturing process is not up to standard, it will damage the internal structure of the insulating oil-filled terminal and cause hidden dangers to the normal operation of the high-voltage cable. Once accumulated to a certain extent, it will directly endanger the safe operation of the high-voltage cable, and even cause serious failures such as explosion and burning of the cable terminal, seriously endangering the personal safety of surrounding personnel and the safe operation of the power grid. The damage to the high-voltage cable oil-filled terminal mainly occurs in the following situations:

[0003] 1) Due to poor quality, the stress cone that is in direct contact with the conductive rod may overheat, be compressed and deformed due to long-term high current and high voltage environment of the conductive rod;

[0004] 2) The insulating oil and solid insulating materials inside the oil-filled terminal of the high-voltage cable, including insulating varnish, insulating sealing gaskets, insulating epoxy fixings, insulating tape, etc., due to poor material quality, will cause some components of the above insulating materials to dissolve in the insulating oil and undergo chemical reactions, accelerating the deterioration of the insulating oil and generating characteristic gases;

[0005] 3) Insulating oil soaks into inferior insulating materials, causing them to swell and deform;

[0006] 4) Discharge and overheating faults cause decomposition reactions between insulating oil and solid insulating materials, accelerating the deterioration of insulating oil and producing characteristic gases.

[0007] Since the high-voltage cable oil-filled terminal is strictly kept sealed during normal operation, there is currently no test device or monitoring method. If a test device can be invented that can identify the quality of the insulating oil, insulating materials and components inside the high-voltage cable oil-filled terminal in a short time through an accelerated degradation test method, thereby correctly screening manufacturers and suppliers, it will be of great significance to ensure the safe, durable and economical operation of the high-voltage cable. Summary of the Invention

[0008] The present invention proposes an accelerated degradation test device and method for the insulation material of a high-voltage oil-filled cable terminal, studies and designs a simulated detachable high-voltage cable oil-filled terminal and a supporting monitoring device, and through artificial adjustment creates an oil-filled terminal cavity environment with voltage, current, temperature, pressure, and high humidity, high temperature, and high oxygen that is higher than the normal operating voltage, current, temperature, and pressure, and remotely monitors the surface temperature and pressure changes of the stress cone. It can conduct accelerated degradation and damage tests on insulation materials and stress cones of various manufacturers in a short period of time, identify the quality of the insulation materials, and timely detect the damage to the internal structures of other components of the oil-filled terminal. It overcomes the difficulty that the existing technology cannot effectively monitor and screen the internal stress cones, insulation tapes, insulation paints, other insulation components, and conductive rods and other products and suppliers of high-voltage cable oil-filled terminals, especially 220kV and above high-voltage, ultra-high voltage, and even ultra-high voltage cable oil-filled terminals. It is of great significance to ensure the safe operation of high-voltage cable oil-filled terminals in reality.

[0009] The present invention adopts the following technical solutions.

[0010] Accelerated degradation test device for high-voltage oil-filled cable terminal insulation materials, used for quality inspection of high-voltage oil-filled cable terminals. The accelerated degradation test device includes a simulation terminal, insulating oil equipment, high-voltage output equipment, detection equipment, and control module.

[0011] The simulation terminal is a high-voltage cable oil-filled simulation terminal, comprising a terminal body and a conductive component located inside the terminal body. The terminal body has a cavity, and an insulation component to be tested is arranged in the cavity and / or the conductive component.

[0012] The terminal body is connected to an environmental simulation device with a built-in insulating oil device, and the environmental simulation device is used to input insulating oil or oxygen with preset parameters into the cavity of the terminal body to form a simulated environment;

[0013] The high-voltage output device is electrically connected to the conductive component, and is used to provide current and voltage within a preset range to the high-voltage cable oil-filled simulation terminal; the detection device is connected to the high-voltage cable oil-filled simulation terminal, and is used to detect the preset parameters of the insulation component to be tested in the high-voltage cable oil-filled simulation terminal; the control module is used to control the opening or closing of the high-voltage output device and / or the environmental simulation device, and to control the operation of the detection device.

[0014] The terminal body includes a first cavity and a second cavity which can be detached into two parts, and the first cavity and the second cavity can be fastened and sealed;

[0015] The conductive component includes a conductive rod, and the insulating component to be tested includes a stress cone and an insulating tape arranged at intervals along the axial direction in the middle of the conductive rod. The conductive component is arranged in a cavity formed by the first cavity and the second cavity, and the two ends of the conductive rod protrude from the terminal body, and the stress cone and the insulating tape are located in the cavity of the terminal body.

[0016] The insulation component to be tested further includes an insulating paint sprayed on the inner walls of the first cavity and the second cavity; the stress cone is directly wrapped around the outside of the connector shielding insulation layer of the conductive rod in the simulation terminal;

[0017] The test sample in the inner cavity of the simulation terminal includes a conductive rod (12), a stress cone (13) of the conductive rod, an insulating tape (14), and an insulating cable (42) for electrical connection. The inner wall of the inner cavity of the simulation terminal is coated with insulating paint and is installed with an insulating structure. The inner cavity of the simulation terminal is filled with insulating oil (15).

[0018] One side of the shell of the simulation terminal cavity near its bottom end is connected to one end of the first small tube (6), and the other end of the first small tube is inserted into the simulation terminal cavity; on the other side of the simulation terminal shell near the bottom end, a second small tube (7) is installed, and the second small tube is also inserted into the simulation terminal cavity;

[0019] The first small tube is connected to one side of the first micro electromagnetic valve (6-1), and the other side of the first micro electromagnetic valve is connected to two branch pipes, one of which is equipped with a third electromagnetic valve (19), and the other is equipped with a micro variable frequency circulation pump outlet electromagnetic valve (30);

[0020] The second small tube is connected to the second micro electromagnetic valve (7-1), and three branch tubes are connected to the pipeline on the other side of the second micro electromagnetic valve, one of which is connected to the air release electromagnetic valve (16), the second branch tube is connected to the online chromatograph inlet electromagnetic valve (18) and the online chromatograph (17) in sequence, and the third branch tube is connected to the insulating oil storage tank inlet electromagnetic valve (32) and the insulating oil storage tank (27) in sequence. The first small tube and the second small tube are both insulating tubes, which are used for insulating and isolating between the external pipe fitting and the inner cavity of the simulation terminal.

[0021] The environmental simulation device includes an oxygen supply device, the terminal body includes an inlet and an outlet, the oxygen supply device is connected to the inlet through a first pipe, and the oxygen supply device is used to input oxygen at a preset pressure, preset temperature, and preset flow rate into the cavity of the terminal body;

[0022] One side of the third solenoid valve is connected in sequence to a heating pipe (21), an oxygen pressure- and flow-stabilizing solenoid valve (23), a pressure reducing valve (24), and a high-pressure, high-purity oxygen cylinder (26); a third temperature sensor (20) is installed on the pipe between the third solenoid valve and the heating pipe; and a pressure- and flow-stabilizing sensor (22) is installed on the pipe between the other side of the heating pipe and the oxygen pressure- and flow-stabilizing solenoid valve.

[0023] The oxygen supply equipment uses a high-purity, high-temperature oxygen module to provide high-pressure, high-temperature oxygen to the simulated environment, and conducts accelerated degradation tests on the internal components of the simulated terminal. The high-purity, high-temperature oxygen module outputs high-purity, high-temperature oxygen into the inner cavity of the simulated terminal;

[0024] A deflation solenoid valve is provided at the outlet pipe of the simulation terminal, which is used to adjust the pressure in the cavity of the simulation terminal and to discharge the oxygen (39) in the cavity of the simulation terminal after the test is completed;

[0025] The high-purity and high-heat oxygen module comprises: a high-pressure high-purity oxygen cylinder (26), a pressure reducing valve (24), a voltage-stabilizing and current-stabilizing electromagnetic valve (23), a voltage-stabilizing and current-stabilizing sensor (22), an electric heating tube (21), a third temperature sensor (20), a third electromagnetic valve (19), and a gas release electromagnetic valve (16);

[0026] The gas outlet of the high-pressure high-purity oxygen cylinder is connected in sequence to a pressure reducing valve, a voltage and flow stabilizing electromagnetic valve (23), a voltage and flow stabilizing sensor, an electric heating tube, a first small tube electromagnetic valve (6-1), a first small tube (6), and an inner cavity of a simulation terminal;

[0027] The pressure and flow stabilization sensor (22) is installed on the pipeline between the pressure and flow stabilization electromagnetic valve and the electric heating tube, and is used for online sensing of the flow rate and pressure of the output oxygen, and transmitting the data to the control module, which controls the pressure and flow stabilization electromagnetic valve to output stable oxygen according to the set pressure and flow value;

[0028] The third temperature sensor is installed at the outlet of the electric heating tube to control the output oxygen to be heated to a set temperature value.

[0029] The detection equipment is a monitoring device connected to a simulated power high-voltage oil-filled cable terminal test device to monitor changes in the simulated environment;

[0030] The detection equipment includes an air-to-air wireless monitoring and transmission device, which includes multiple temperature sensors, multiple pressure sensors and multiple visual sensors. Some temperature sensors are arranged on the inner walls of the first cavity and the second cavity, and the remaining temperature sensors are arranged on the outer wall of the stress cone; some pressure sensors are arranged on the inner walls of the first cavity and the second cavity, and the remaining pressure sensors are arranged on the outer wall of the stress cone; multiple visual sensors are arranged at intervals on the inner walls of the first cavity and the second cavity, multiple temperature sensors are used to collect temperature data of the simulated environment, multiple pressure sensors are used to collect pressure data of the simulated environment, and multiple visual sensors are used to collect appearance image data of the insulating components to be tested.

[0031] The environmental simulation equipment also includes an insulating oil device. The terminal body includes an inlet and an outlet. One end of the insulating oil device is connected to the inlet through a second pipe, and the other end is connected to the outlet through a third pipe. The insulating oil device is used to fill the cavity of the terminal body with insulating oil of preset temperature and humidity.

[0032] The insulating oil equipment includes an insulating oil storage tank, a heating block for heating the insulating oil is provided outside the insulating oil storage tank, the outlet of the terminal body is connected to the inlet end of the insulating oil storage tank through a third pipe, and the inlet of the terminal body is connected to the outlet end of the insulating oil storage tank through a second pipe;

[0033] A micro-variable frequency circulation pump (30) and an insulating oil flow sensor (31) are provided on the second pipeline. The flow sensor is used to detect the real-time flow in the second pipeline and feed back the detection result to the control module. The control module regulates the open circuit size of the circulation pump according to a preset flow value.

[0034] The insulating oil storage tank is also provided with a stirrer (33), which comprises a stirring motor and a stirring blade. The stirring blade is located in the cavity of the insulating oil storage tank, and the stirring motor drives the stirring blade to rotate to stir the insulating oil in the insulating oil storage tank.

[0035] The insulating oil storage tank is also provided with a sprayer (36) and an online trace moisture meter (35). The sprayer is used to spray high-purity deionized water into the insulating oil storage tank, and the online trace moisture meter is used to detect the trace moisture content of the insulating oil in the insulating oil storage tank.

[0036] Insulating oil equipment includes micro frequency conversion circulation pump, moist high-temperature insulating oil module, high-purity high-temperature oxygen module;

[0037] An insulating oil flow sensor (31) is installed on the connecting pipe between the outlet electromagnetic valve (30) of the micro-variable frequency circulation pump and the first small tube electromagnetic valve (6-1). After the real-time flow rate measured by the insulating oil flow sensor is transmitted to the control module, the control module controls the output of the micro-variable frequency circulation pump according to a preset flow rate value to output a stable flow rate.

[0038] In the insulating oil equipment, the humid high-temperature insulating oil module is used to change the humidity and temperature of the simulated environment, and comprises: an insulating oil storage tank (27) for storing insulating oil, an electric heating block (28) for heating the insulating oil, a sprayer (36) for spraying water into the insulating oil storage tank, a sprayer water inlet solenoid valve (37), a second temperature sensor (34), an online trace moisture meter (35), an insulating oil flow sensor (31), a micro-frequency conversion circulation pump (29), an insulating oil storage tank outlet solenoid valve (30), and an insulating oil storage tank inlet solenoid valve (32).

[0039] The insulating oil storage tank of the insulating oil equipment is in the shape of a cylinder with both the upper and lower bottoms sealed. A stirrer is vertically installed in the middle of the inner axial part of the storage tank. A stirrer motor (33), a second temperature sensor (34), an online trace moisture online meter (35), and a sprayer are installed on the top of the insulating oil storage tank. An oil inlet of the storage tank is installed on the upper part of one side of the insulating oil storage tank. The oil inlet of the storage tank is connected in sequence to an insulating oil storage tank inlet electromagnetic valve (32), a second small tube electromagnetic valve (7-1), a second small tube (7), and an inner cavity of a simulation terminal. An oil outlet of the storage tank is installed on the lower part of the other side of the insulating oil storage tank. An insulating oil storage tank outlet electromagnetic valve (9) is installed on the oil outlet. The insulating oil storage tank outlet electromagnetic valve (9) is connected to the inlet of a micro-variable frequency circulation pump (29). A micro-variable frequency circulation pump outlet electromagnetic valve (30) is installed at the outlet of the micro-variable frequency circulation pump. The outlet electromagnetic valve (30) of the micro-variable frequency circulation pump is connected in sequence to a first small tube electromagnetic valve (6-1), a first small tube (6), and an inner cavity of the simulation terminal.

[0040] An electric heating block (28) with a uniform arc is installed on the outer wall of the insulating oil storage tank cylinder to heat the insulating oil in the storage tank, a second temperature sensor (34) is installed to control the heating temperature, and an online trace moisture meter (35) is installed to detect the trace water content of the insulating oil in the storage tank;

[0041] The insulating oil storage tank is provided with a spray head of a sprayer (36), and a water inlet pipe of the sprayer is provided with a water inlet electromagnetic valve (37).

[0042] Testing equipment also includes online chromatograph;

[0043] A first small tube is provided at the sample outlet of the online chromatograph, and a second small tube is provided at the sample inlet;

[0044] The top of the online chromatograph is provided with an injection port, which is sequentially connected to the chromatograph inlet electromagnetic valve, the second micro electromagnetic valve (7-1), the second small tube (7), and the simulation terminal cavity;

[0045] A sample outlet is installed on one side of the online chromatograph, and the sample outlet is sequentially connected to a chromatograph outlet electromagnetic valve (46), an inlet of a micro-frequency conversion circulation pump (29), an outlet electromagnetic valve of the micro-frequency conversion circulation pump (30), a first small tube electromagnetic valve (6-1), a first small tube, and an inner cavity of the simulation terminal;

[0046] The online chromatograph is connected to the insulating oil in the simulation terminal cavity through the first small tube and the second small tube to sample the insulating oil and detect changes in the insulating oil in the simulation environment.

[0047] The high-voltage output device includes a high-voltage output device, a shunt load device and a voltage divider load device, and the shunt load device and the voltage divider load device are grounded;

[0048] The high voltage output device and the current divider load device are electrically connected to one end of the conductive component respectively, and the voltage divider load device is electrically connected to the other end of the conductive component;

[0049] High-voltage output equipment is equipment that can output large current and high voltage; the insulation components to be tested include insulating paint, epoxy insulation, insulating gaskets, and insulating tape;

[0050] The simulation terminal, insulating oil equipment, high-voltage output equipment, and control module are combined into a simulated power high-voltage oil-filled cable terminal test device for forming a simulated environment;

[0051] In the simulated power high-voltage oil-filled cable terminal test device, the control module is connected to the monitoring device, micro-frequency conversion circulation pump, moist high-temperature insulating oil module, high-purity high-temperature oxygen module, and high-voltage output equipment via a communication link;

[0052] The sample to be tested is placed in the inner cavity of the simulation terminal that forms the simulation environment. The inner cavity of the simulation terminal is connected to a micro-frequency conversion circulation pump for adjusting the simulation environment, a humid high-temperature insulating oil module, a high-purity high-temperature oxygen module, and a high-voltage output device;

[0053] The control module is connected to the air-to-air wireless monitoring and transmission device, and the control module is connected to an online chromatograph for monitoring the tested sample;

[0054] The high voltage output device is used to provide a high voltage and a large current within a predetermined range to the analog terminal;

[0055] The voltage output end of the high-voltage output device is provided with a primary voltage regulator (40), a high-voltage output device (41), and an output insulation cable (42); the high-voltage output device also includes a loop insulation cable (43), a shunt load (44), and a voltage divider load (45); the shunt load and the voltage divider load are grounded;

[0056] The high voltage output device and the current divider load device are electrically connected to one end of the conductive component respectively, and the voltage divider load device is electrically connected to the other end of the conductive component;

[0057] The output insulated cable is respectively connected to the lower end of the simulated terminal conductive rod and the shunt load, and the loop insulated cable is respectively connected to the upper end of the conductive rod and the voltage divider load. The shunt load and the voltage divider load are both grounded.

[0058] The airborne wireless monitoring and transmission device comprises a first micro airborne temperature sensor (10), a second micro airborne temperature sensor (10-1), a first micro airborne pressure sensor (11), a second micro airborne pressure sensor (11-1), a plurality of micro airborne wide-angle vision sensors (5), and a micro wireless receiving device (47) installed near the outside of the simulation terminal;

[0059] The first micro-temperature sensor of the air-to-air wireless monitoring and transmission device is attached to the surface of the stress cone and is used to detect the surface temperature of the stress cone;

[0060] The first micro air-space pressure sensor of the air-space wireless monitoring transmission device is attached to other upper, middle and lower positions of the stress cone surface to detect pressure changes on the stress cone surface;

[0061] A second micro air temperature sensor (10-1) of the air wireless monitoring and transmission device, a second micro air pressure sensor of the air wireless monitoring and transmission device, and a plurality of micro air wide-angle vision sensors 5 are embedded and installed on the inner wall of the inner cavity of the simulation terminal. The second micro air temperature sensor is used to detect the temperature of the inner cavity of the simulation terminal, the second micro air pressure sensor is used to detect the pressure of the inner cavity of the simulation terminal, and the micro air wide-angle vision sensor is used to monitor the position deformation of each component installed in the inner cavity of the simulation terminal.

[0062] The first micro-spaced temperature sensor is used to detect the surface temperature change of the stress cone, and the first micro-spaced pressure sensor is used to detect the interface pressure change of the stress cone. The stress cone is directly wrapped on the shielding insulation layer of the conductive rod;

[0063] The first micro air temperature sensor, the second micro air temperature sensor, the first micro air pressure sensor, the second micro air pressure sensor, and the micro air wide-angle vision sensor are all sealed and packaged with a micro radio frequency transmitter. The micro radio frequency transmitter is used to wirelessly transmit the detection data to an external micro wireless receiving device, and the micro wireless receiving device then transmits the data to the control module through an optical fiber (48). The wireless communication frequency of the wireless transmission device complies with the wireless communication frequency band range specified by the state.

[0064] The input end of the control module is electrically connected to the output ends of the online chromatograph, the online trace moisture meter, the insulating oil flow sensor, the oxygen voltage and current stabilization sensor, the second temperature sensor, and the third temperature sensor via data cables. The input end of the control module is also respectively connected to the radio frequency transmitting ends of the first micro air temperature sensor, the second micro air temperature sensor, the first micro air pressure sensor, the second micro air pressure sensor, and the micro air wide-angle vision sensor via air wireless transmission devices.

[0065] The output end of the control module is electrically connected to the micro-frequency conversion circulation pump, the arc-shaped electric heating block, the sprayer, the oxygen voltage and flow stabilizing solenoid valve, the electric heating tube, the first solenoid valve, the second solenoid valve, the third solenoid valve, the online chromatograph inlet solenoid valve, the online chromatograph outlet solenoid valve, the micro-frequency conversion circulation pump outlet solenoid valve, the water inlet solenoid valve, the air release solenoid valve, the insulating oil storage tank inlet solenoid valve, the insulating oil storage tank outlet solenoid valve, the agitator, and the input end of the alarm.

[0066] The accelerated degradation test method for the insulation material of a high-voltage oil-filled cable terminal uses the accelerated degradation test device for the insulation material of a high-voltage oil-filled cable terminal described above. The test method is used for quality inspection of a high-voltage oil-filled power cable terminal having a conductive rod installed in the inner cavity and a stress cone wrapped around the insulation shield of the conductive rod joint, and includes the following steps:

[0067] Deploying a simulation environment, i.e., setting up a simulation environment containing a detachable high-voltage cable oil-filled simulation terminal; assembling the high-voltage cable oil-filled simulation terminal, wherein the high-voltage cable oil-filled simulation terminal includes a terminal body and a conductive component located within the terminal body, the terminal body having a cavity, and the insulation component to be tested is disposed within the cavity;

[0068] Inputting insulating oil or oxygen with preset parameters into the cavity of the terminal body to form a simulated environment;

[0069] Adjust the simulation environment, and then monitor the surface temperature and pressure changes of the stress cone remotely to accelerate the degradation of the insulating oil, insulation material and stress cone used in the oil-filled terminal of the high-voltage cable to identify their quality;

[0070] Check for structural damage to other components inside the oil filling terminal;

[0071] Provide current and voltage within the preset range to the high voltage cable oil-filled simulation terminal;

[0072] Detect the preset parameters of the insulation components to be tested in the high-voltage cable oil-filled simulation terminal and obtain test data.

[0073] Before performing the accelerated degradation test, the stress cone is covered with insulating material and assembled in a simulation terminal. Insulating oil is then filled in. The accelerated degradation test is monitored under set time and conditions. The monitoring data is recorded and used as a standard for comparison.

[0074] The accelerated degradation test is a high voltage, high current accelerated degradation test under hot oil and high humidity conditions, or a high heat and oxygen accelerated degradation deformation test.

[0075] The step of inputting the insulating oil with preset parameters into the cavity of the terminal body comprises: filling the cavity of the terminal body with insulating oil with preset temperature and humidity.

[0076] The inputting of oxygen with preset parameters into the cavity of the terminal body includes: inputting oxygen with a preset pressure, a preset temperature, and a preset flow rate into the cavity of the terminal body.

[0077] The method of providing a current and a voltage within a preset range to the high-voltage cable oil-filled simulation terminal includes:

[0078] The high-voltage output device is electrically connected to the conductive component; the high-voltage output device is used to provide a preset range of voltage and current to the high-voltage cable oil-filled simulation terminal.

[0079] Detecting preset parameters of the insulation component to be tested in the high-voltage cable oil-filled simulation terminal and obtaining detection data includes: setting the insulation component to be tested on the inner wall of the cavity and / or the outer wall of the conductive component; and obtaining the preset parameters of the insulation component to be tested through the detection equipment.

[0080] The detection equipment includes multiple temperature sensors, multiple pressure sensors, and multiple visual sensors. Some temperature sensors are arranged on the inner walls of the first cavity and the second cavity, and the remaining temperature sensors are arranged on the outer wall of the stress cone; some pressure sensors are arranged on the inner walls of the first cavity and the second cavity, and the remaining pressure sensors are arranged on the outer wall of the stress cone; multiple visual sensors are arranged at intervals on the inner walls of the first cavity and the second cavity;

[0081] The temperature sensor is used to collect temperature data of the simulated environment.

[0082] The pressure sensor is used to collect pressure data of the simulated environment.

[0083] The visual sensor is used to collect appearance change data of the tested samples in the simulated environment.

[0084] The detection equipment also includes a chromatograph, which connects the insulating oil in the cavity with the first small tube and the second small tube to sample the insulating oil and detect changes in the insulating oil in the simulated environment.

[0085] After the step of detecting preset parameters of the components to be tested in the high-voltage cable oil-filled simulation terminal and obtaining detection data, the method further includes: issuing an alarm when the obtained detection data is greater than a threshold.

[0086] When performing a high voltage, high current accelerated degradation test, the insulating paint to be tested is sprayed onto the inner wall of the cavity of the terminal body and dried and solidified; an insulating component to be tested of the test sample is set in the inner cavity, and the insulating component to be tested includes a conductive rod (12), a stress cone (13) of the conductive rod, an insulating tape (14), and an insulating cable (42) for electrical connection.

[0087] The insulation assembly to be tested includes a stress cone and an insulation tape which are arranged at intervals along the axial direction in the middle of a conductive rod; the lower end of the conductive rod is connected to the insulated cable;

[0088] After completing the test environment setup, perform a high voltage and high current accelerated degradation test, or a high heat and oxygen accelerated degradation deformation test.

[0089] The present invention provides a test device and monitoring method that can effectively monitor the insulating oil, solid insulating components, insulating varnish applied to the inner wall, and stress cones inside a high-voltage cable oil-filled terminal. The test device can identify the quality of the insulating oil, insulating materials, and components used inside the high-voltage cable oil-filled terminal in a short period of time through an accelerated deterioration test method, thereby correctly screening manufacturers and suppliers. This is of great significance for ensuring the safe, durable, and economical operation of high-voltage cables.

[0090] The present invention proposes an accelerated degradation test device and method for the insulation material and stress cone of the electric high-voltage oil-filled cable terminal. By researching, designing and simulating a detachable high-voltage cable oil-filled terminal and a supporting monitoring device, the device can artificially adjust to create an oil-filled terminal cavity environment with voltage, current, temperature, pressure, and high humidity, high temperature, and high oxygen that is higher than the normal operating voltage, current, temperature, and pressure, and monitor the surface temperature and pressure changes of the stress cone remotely. The device can perform accelerated degradation and damage tests on the insulation materials and stress cones of various manufacturers in a short period of time to identify their quality. The device can also promptly detect the damage to the internal structure of other components of the oil-filled terminal. The device overcomes the difficulty that the existing technology cannot effectively monitor and screen the internal stress cones, insulating tapes, insulating paints, other insulating components, and conductive rods and other products and suppliers of high-voltage cable oil-filled terminals, especially high-voltage, ultra-high-voltage, and even ultra-high-voltage cable oil-filled terminals of 220kV and above. The device is of great significance for ensuring the safe operation of high-voltage cable oil-filled terminals in reality.

[0091] The present invention proposes a method and device for effectively monitoring the insulating oil, solid insulating components, insulating paint applied on the inner wall, and stress cone inside the oil-filled terminal of a high-voltage cable, which has the following beneficial effects:

[0092] 1) Based on the actual structure of the power high-voltage oil-filled cable terminal, a detachable simulation of the oil-filled cable terminal cavity is designed to facilitate deployment in the test;

[0093] 2) It can artificially adjust and create a temperature, pressure, humidity, high temperature, and high oxygen environment higher than normal operating temperature, making it easy to adjust and preset the test environment;

[0094] 3) Design of an air-gapped wireless monitoring and transmission device suitable for sealed operation during simulation terminal operation, ensuring safe and reliable real-time data transmission during testing in a high-voltage environment;

[0095] 4) Combined with the developed test monitoring method for accelerated degradation of insulation materials of power high-voltage oil-filled cable terminals, it is possible to identify inferior components in power high-voltage oil-filled cable terminals through simulated accelerated degradation tests in a short period of time. BRIEF DESCRIPTION OF THE DRAWINGS

[0096] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0097] Attachment Figure 1 It is a schematic diagram of the two-piece porcelain sleeve cavity of the oil-filled cable terminal and the conductive rod and fixed insulating fixture;

[0098] Attachment Figure 2 This is a schematic diagram of installing the conductive rod and components in the two-piece porcelain sleeve cavity of the oil-filled cable terminal;

[0099] Attachment Figure 3 This is a schematic diagram of an accelerated degradation test device for insulation materials at the terminals of power high-voltage oil-filled cables;

[0100] Attachment Figure 4 This is a schematic diagram of the accelerated degradation test device for the insulation material of the terminal of the power high-voltage oil-filled cable when performing a chromatographic test;

[0101] Attachment Figure 5 This is a schematic diagram of the accelerated degradation test device for the terminal insulation material of the high-voltage oil-filled power cable when performing the hot oil (hot insulating oil) high-humidity accelerated degradation test;

[0102] Attachment Figure 6 This is a schematic diagram of the accelerated degradation test device for the terminal insulation material of the high-voltage oil-filled power cable when performing a high-heat-oxidation accelerated degradation test;

[0103] Attachment Figure 7 This is a schematic diagram of the accelerated degradation test device for the terminal insulation material of the power high-voltage oil-filled cable when performing a high-voltage electrical test;

[0104] Attachment Figure 8 It is a schematic diagram of wireless data signal transmission by an air-to-air wireless transmission system;

[0105] Attachment Figure 9 It is a block diagram of the control principle of the control module;

[0106] In the figure: 1 - first cavity (simulating the left valve cavity of the terminal); 2 - second cavity (simulating the right valve cavity of the terminal); 3 - porcelain sleeve; 4 - insulating fixing bolt; 5 - micro-spaced wide-angle vision sensor; 6 - first small tube; 6 - 1 - first solenoid valve; 7 - second small tube; 7 - 1 - second solenoid valve; 8 - insulating support foot; 9 - insulating oil tank outlet solenoid valve;

[0107] 10 - First micro-space temperature sensor; 10-1 - Second micro-space temperature sensor; 11 - First micro-space pressure sensor; 11-1 - Second micro-space pressure sensor; 12 - Conductive rod; 13 - Stress cone; 14 - Insulation tape; 15 - Insulation oil; 16 - Degassing solenoid valve; 17 - Online chromatograph; 18 - Online chromatograph inlet solenoid valve; 19 - Third solenoid valve;

[0108] 20 - Third temperature sensor; 21 - Electric heating tube; 22 - Oxygen voltage and flow stabilization sensor; 23 - Oxygen voltage and flow stabilization solenoid valve; 24 - Pressure reducing valve; 25 - High-pressure, high-purity oxygen cylinder valve; 26 - High-pressure, high-purity oxygen cylinder; 27 - Insulating oil storage tank; 28 - Arc-shaped electric heating block; 29 - Micro variable-frequency circulation pump;

[0109] 30 - Micro-frequency conversion circulation pump outlet solenoid valve; 31 - Insulating oil flow sensor; 32 - Insulating oil storage tank inlet solenoid valve; 33 - Agitator; 34 - Second temperature sensor; 35 - Online trace moisture meter; 36 - Sprayer; 37 - Sprayer water inlet solenoid valve; 38 - High-purity deionized water; 39 - High-purity oxygen;

[0110] 40-primary voltage regulator; 41-high voltage output device; 42-output insulated cable; 43-loop insulated cable; 44-shunt load device; 45-voltage divider load device; 46-online chromatograph outlet solenoid valve; 47-micro wireless receiving device; 48-optical fiber. DETAILED DESCRIPTION

[0111] As shown in the figure, the accelerated degradation test device for high-voltage oil-filled cable terminal insulation materials is used to detect the quality of high-voltage cable oil-filled terminals. The accelerated degradation test device includes a simulation terminal, insulating oil equipment, high-voltage output equipment, detection equipment, and a control module.

[0112] The simulation terminal is a high-voltage cable oil-filled simulation terminal, comprising a terminal body and a conductive component located inside the terminal body. The terminal body has a cavity, and an insulation component to be tested is arranged in the cavity and / or the conductive component.

[0113] The terminal body is connected to an environmental simulation device with a built-in insulating oil device, and the environmental simulation device is used to input insulating oil or oxygen with preset parameters into the cavity of the terminal body to form a simulated environment;

[0114] The high-voltage output device is electrically connected to the conductive component, and is used to provide current and voltage within a preset range to the high-voltage cable oil-filled simulation terminal; the detection device is connected to the high-voltage cable oil-filled simulation terminal, and is used to detect the preset parameters of the insulation component to be tested in the high-voltage cable oil-filled simulation terminal; the control module is used to control the opening or closing of the high-voltage output device and / or the environmental simulation device, and to control the operation of the detection device.

[0115] like Figure 1 As shown, the terminal body includes a first cavity and a second cavity that can be detached into two parts, and the first cavity and the second cavity can be fastened and sealed;

[0116] like Figure 2 As shown, the conductive component includes a conductive rod, and the insulating component to be tested includes a stress cone and an insulating tape arranged at intervals along the axial direction in the middle of the conductive rod. The conductive component is arranged in a cavity formed by the first cavity and the second cavity, and the two ends of the conductive rod protrude from the terminal body, and the stress cone and the insulating tape are located in the cavity of the terminal body.

[0117] The insulation component to be tested further includes an insulating paint sprayed on the inner walls of the first cavity and the second cavity; the stress cone is directly wrapped around the outside of the connector shielding insulation layer of the conductive rod in the simulation terminal;

[0118] The test sample in the inner cavity of the simulated terminal includes a conductive rod 12, a stress cone 13 of the conductive rod, an insulating tape 14, and an insulated cable 42 for electrical connection. The inner wall of the inner cavity of the simulated terminal is coated with insulating paint and installed with an insulating structure. The inner cavity of the simulated terminal is filled with insulating oil 15.

[0119] like Figure 3 As shown, one side of the shell of the simulation terminal cavity near its bottom end is connected to one end of the first small tube 6, and the other end of the first small tube is inserted into the simulation terminal cavity; on the other side of the simulation terminal shell near the bottom end, a second small tube 7 is installed, and the second small tube is also inserted into the simulation terminal cavity;

[0120] The first small tube is connected to one side of the first micro solenoid valve 6-1, and the other side of the first micro solenoid valve is connected to two branch pipes, one of which is equipped with a third solenoid valve 19, and the other is equipped with a micro variable frequency circulation pump outlet solenoid valve 30;

[0121] The second small tube is connected to the second micro solenoid valve 7-1, and three branch tubes are connected to the pipe on the other side of the second micro solenoid valve, one of which is connected to the vent solenoid valve 16, the second branch tube is connected to the online chromatograph inlet solenoid valve 18 and the online chromatograph 17 in sequence, and the third branch tube is connected to the insulating oil storage tank inlet solenoid valve 32 and the insulating oil storage tank 27 in sequence. The first small tube and the second small tube are both insulating tubes, which are used for insulation isolation between the external pipe fittings and the inner cavity of the simulation terminal.

[0122] The environmental simulation device includes an oxygen supply device, the terminal body includes an inlet and an outlet, the oxygen supply device is connected to the inlet through a first pipe, and the oxygen supply device is used to input oxygen at a preset pressure, preset temperature, and preset flow rate into the cavity of the terminal body;

[0123] One side of the third solenoid valve is connected in sequence to the heating tube 21, the oxygen pressure and flow stabilizing solenoid valve 23, the pressure reducing valve 24, and the high-pressure and high-purity oxygen cylinder 26. A third temperature sensor 20 is installed on the pipe between the third solenoid valve and the heating tube, and a pressure and flow stabilizing sensor 22 is installed on the pipe between the other side of the heating tube and the oxygen pressure and flow stabilizing solenoid valve.

[0124] The oxygen supply equipment uses a high-purity, high-temperature oxygen module to provide high-pressure, high-temperature oxygen to the simulated environment, and conducts accelerated degradation tests on the internal components of the simulated terminal. The high-purity, high-temperature oxygen module outputs high-purity, high-temperature oxygen into the inner cavity of the simulated terminal;

[0125] A vent solenoid valve is provided at the outlet pipe of the simulation terminal to adjust the pressure in the simulation terminal cavity and to discharge the oxygen in the simulation terminal cavity after the test is completed.

[0126] like Figure 6 As shown, the high-purity and high-heat oxygen module includes: a high-pressure high-purity oxygen cylinder 26, a pressure reducing valve 24, a pressure and flow stabilizing solenoid valve 23, a pressure and flow stabilizing sensor 22, an electric heating tube 21, a third temperature sensor 20, a third solenoid valve 19, and a gas release solenoid valve 16;

[0127] The outlet of the high-pressure high-purity oxygen cylinder is connected in sequence with a pressure reducing valve, a voltage and flow stabilizing solenoid valve 23, a voltage and flow stabilizing sensor, an electric heating tube, a first small tube solenoid valve 6-1, a first small tube 6, and an inner cavity of the simulation terminal;

[0128] The pressure and flow stabilization sensor 22 is installed on the pipeline between the pressure and flow stabilization solenoid valve and the electric heating tube. It is used to sense the flow and pressure of the output oxygen online and transmit the data to the control module. The control module controls the pressure and flow stabilization solenoid valve to output stable oxygen according to the set pressure and flow value.

[0129] The third temperature sensor is installed at the outlet of the electric heating tube to control the output oxygen to be heated to a set temperature value.

[0130] The detection equipment is a monitoring device connected to a simulated power high-voltage oil-filled cable terminal test device to monitor changes in the simulated environment;

[0131] The detection equipment includes an air-to-air wireless monitoring and transmission device, which includes multiple temperature sensors, multiple pressure sensors and multiple visual sensors. Some temperature sensors are arranged on the inner walls of the first cavity and the second cavity, and the remaining temperature sensors are arranged on the outer wall of the stress cone; some pressure sensors are arranged on the inner walls of the first cavity and the second cavity, and the remaining pressure sensors are arranged on the outer wall of the stress cone; multiple visual sensors are arranged at intervals on the inner walls of the first cavity and the second cavity, multiple temperature sensors are used to collect temperature data of the simulated environment, multiple pressure sensors are used to collect pressure data of the simulated environment, and multiple visual sensors are used to collect appearance image data of the insulating components to be tested.

[0132] The environmental simulation equipment also includes an insulating oil device. The terminal body includes an inlet and an outlet. One end of the insulating oil device is connected to the inlet through a second pipe, and the other end is connected to the outlet through a third pipe. The insulating oil device is used to fill the cavity of the terminal body with insulating oil of preset temperature and humidity.

[0133] The insulating oil equipment includes an insulating oil storage tank, a heating block for heating the insulating oil is provided outside the insulating oil storage tank, the outlet of the terminal body is connected to the inlet end of the insulating oil storage tank through a third pipe, and the inlet of the terminal body is connected to the outlet end of the insulating oil storage tank through a second pipe;

[0134] A micro variable frequency circulation pump 30 and an insulating oil flow sensor 31 are provided on the second pipeline. The flow sensor is used to detect the real-time flow in the second pipeline and feed back the detection results to the control module. The control module adjusts the open circuit size of the circulation pump according to the preset flow value.

[0135] The insulating oil storage tank is further provided with a stirrer 33 , which includes a stirring motor and stirring blades. The stirring blades are located in the cavity of the insulating oil storage tank. The stirring motor drives the stirring blades to rotate to stir the insulating oil in the insulating oil storage tank.

[0136] The insulating oil storage tank is also provided with a sprayer (36) and an online trace moisture meter (35). The sprayer is used to spray high-purity deionized water into the insulating oil storage tank, and the online trace moisture meter is used to detect the trace moisture content of the insulating oil in the insulating oil storage tank.

[0137] Insulating oil equipment includes micro frequency conversion circulation pump, moist high-temperature insulating oil module, high-purity high-temperature oxygen module;

[0138] like Figure 4As shown, an insulating oil flow sensor 31 is installed on the connecting pipe between the outlet solenoid valve 30 of the micro variable frequency circulation pump and the first small tube solenoid valve 6-1. After the real-time flow measured by the insulating oil flow sensor is transmitted to the control module, the control module controls the output of the micro variable frequency circulation pump according to the preset flow value to output a stable flow.

[0139] like Figure 5 As shown, in the insulating oil equipment, the humid high-temperature insulating oil module is used to change the humidity and temperature of the simulated environment, which includes: an insulating oil storage tank 27 for storing insulating oil, an electric heating block 28 for heating the insulating oil, a sprayer 36 for spraying water into the insulating oil storage tank, a sprayer water inlet solenoid valve 37, a second temperature sensor 34, an online trace moisture meter 35, an insulating oil flow sensor 31, a micro-frequency conversion circulation pump 29, an insulating oil storage tank outlet solenoid valve 30, and an insulating oil storage tank inlet solenoid valve 32.

[0140] The insulating oil storage tank of the insulating oil equipment is in the shape of a cylinder with both the upper and lower bottoms sealed. An agitator is vertically installed in the middle of the inner axial direction of the storage tank. The top of the insulating oil storage tank is respectively installed with an agitator motor 33, a second temperature sensor 34, an online trace moisture meter 35, and a sprayer; the upper part of one side of the insulating oil storage tank is installed with an oil inlet of the storage tank, which is connected to the insulating oil storage tank inlet solenoid valve 32, the second small tube solenoid valve 7-1, the second small tube 7, and the simulation terminal inner cavity in sequence; the lower part of the other side of the insulating oil storage tank is installed with an oil outlet of the storage tank, and the oil outlet is installed with an insulating oil storage tank outlet solenoid valve 9, which is connected to the inlet of the micro-variable frequency circulation pump 29, and the outlet of the micro-variable frequency circulation pump is installed with a micro-variable frequency circulation pump outlet solenoid valve 30, and the micro-variable frequency circulation pump outlet solenoid valve 30 is connected to the first small tube solenoid valve 6-1, the first small tube 6, and the simulation terminal inner cavity in sequence;

[0141] An electric heating block 28 with a uniform arc is installed on the outer wall of the insulating oil storage tank to heat the insulating oil in the storage tank. A second temperature sensor 34 is installed to control the heating temperature. An online trace moisture meter 35 is installed to detect the trace water content of the insulating oil in the storage tank.

[0142] The spray head of the sprayer 36 is inserted into the insulating oil storage tank, and the water inlet pipe of the sprayer is installed with a sprayer water inlet solenoid valve 37.

[0143] Testing equipment also includes online chromatograph;

[0144] A first small tube is provided at the sample outlet of the online chromatograph, and a second small tube is provided at the sample inlet;

[0145] The top of the online chromatograph is provided with an injection port, which is sequentially connected to the chromatograph inlet solenoid valve, the second micro solenoid valve 7-1, the second small tube 7, and the simulation terminal cavity;

[0146] like Figure 4 As shown, a sample outlet is installed on one side of the online chromatograph, and the sample outlet is sequentially connected to the chromatograph outlet solenoid valve 46, the inlet of the micro-frequency conversion circulation pump 29, the outlet solenoid valve 30 of the micro-frequency conversion circulation pump, the first small tube solenoid valve 6-1, the first small tube, and the inner cavity of the simulation terminal;

[0147] The online chromatograph is connected to the insulating oil in the simulation terminal cavity through the first small tube and the second small tube to sample the insulating oil and detect changes in the insulating oil in the simulation environment.

[0148] The high voltage output device includes a high voltage output device 41, a shunt load device 44 and a voltage divider load device 45, and the shunt load device and the voltage divider load device are grounded;

[0149] The high voltage output device and the current divider load device are electrically connected to one end of the conductive component respectively, and the voltage divider load device is electrically connected to the other end of the conductive component;

[0150] High-voltage output equipment is equipment that can output large current and high voltage; the insulation components to be tested include insulating paint, epoxy insulation, insulating gaskets, and insulating tape;

[0151] The simulation terminal, insulating oil equipment, high-voltage output equipment, and control module are combined into a simulated power high-voltage oil-filled cable terminal test device for forming a simulated environment;

[0152] In the simulated power high-voltage oil-filled cable terminal test device, the control module is connected to the monitoring device, micro-frequency conversion circulation pump, moist high-temperature insulating oil module, high-purity high-temperature oxygen module, and high-voltage output equipment via a communication link;

[0153] The sample to be tested is placed in the inner cavity of the simulation terminal that forms the simulation environment. The inner cavity of the simulation terminal is connected to a micro-frequency conversion circulation pump for adjusting the simulation environment, a humid high-temperature insulating oil module, a high-purity high-temperature oxygen module, and a high-voltage output device;

[0154] The control module is connected to the air-to-air wireless monitoring and transmission device, and the control module is connected to an online chromatograph for monitoring the tested sample;

[0155] like Figure 7 As shown, the high voltage output device is used to provide a high voltage and a large current within a predetermined range to the analog terminal;

[0156] The voltage output terminal of the high-voltage output device is provided with a primary voltage regulator 40, a high-voltage output device 41, and an output insulated cable 42; the high-voltage output device also includes a loop insulated cable 43, a shunt load 44, and a voltage divider load 45; the shunt load and the voltage divider load are grounded;

[0157] The high voltage output device and the current divider load device are electrically connected to one end of the conductive component respectively, and the voltage divider load device is electrically connected to the other end of the conductive component;

[0158] The output insulated cable is respectively connected to the lower end of the simulated terminal conductive rod and the shunt load, and the loop insulated cable is respectively connected to the upper end of the conductive rod and the voltage divider load. The shunt load and the voltage divider load are both grounded.

[0159] like Figure 8 As shown, the air-to-air wireless monitoring and transmission device includes a first micro air-to-air temperature sensor 10, a second micro air-to-air temperature sensor 10-1, a first micro air-to-air pressure sensor 11, a second micro air-to-air pressure sensor 11-1, a plurality of micro air-to-air wide-angle vision sensors 5, and a micro wireless receiving device 47 installed near the outside of the simulation terminal;

[0160] The first micro-temperature sensor of the air-to-air wireless monitoring and transmission device is attached to the surface of the stress cone and is used to detect the surface temperature of the stress cone;

[0161] The first micro air-space pressure sensor of the air-space wireless monitoring transmission device is attached to other upper, middle and lower positions of the stress cone surface to detect pressure changes on the stress cone surface;

[0162] A second miniature air temperature sensor 10-1 of the air wireless monitoring and transmission device, a second miniature air pressure sensor of the air wireless monitoring and transmission device, and several miniature air wide-angle vision sensors 5 are embedded and installed on the inner wall of the inner cavity of the simulation terminal. The second miniature air temperature sensor is used to detect the temperature of the inner cavity of the simulation terminal, the second miniature air pressure sensor is used to detect the pressure of the inner cavity of the simulation terminal, and the miniature air wide-angle vision sensor is used to monitor the position deformation of each component installed in the inner cavity of the simulation terminal;

[0163] The first micro-spaced temperature sensor is used to detect the surface temperature change of the stress cone, and the first micro-spaced pressure sensor is used to detect the interface pressure change of the stress cone. The stress cone is directly wrapped on the shielding insulation layer of the conductive rod;

[0164] The first micro air temperature sensor, the second micro air temperature sensor, the first micro air pressure sensor, the second micro air pressure sensor, and the micro air wide-angle vision sensor are all sealed with a micro RF transmitter. The micro RF transmitter is used to wirelessly transmit the detection data to an external micro wireless receiving device. The micro wireless receiving device then transmits the data to the control module through optical fiber 48. The wireless communication frequency of the wireless transmission device complies with the wireless communication frequency band range specified by the state.

[0165] like Figure 9As shown, the input end of the control module is electrically connected to the output ends of the online chromatograph, the online trace moisture meter, the insulating oil flow sensor, the oxygen voltage and current stabilization sensor, the second temperature sensor, and the third temperature sensor via data cables, and the input end of the control module is also respectively connected to the radio frequency transmitting ends of the first micro air temperature sensor, the second air micro temperature sensor, the first micro air pressure sensor, the second micro air pressure sensor, and the micro air wide-angle vision sensor via air wireless transmission devices;

[0166] The output end of the control module is electrically connected to the micro-frequency conversion circulation pump, the arc-shaped electric heating block, the sprayer, the oxygen voltage and flow stabilizing solenoid valve, the electric heating tube, the first solenoid valve, the second solenoid valve, the third solenoid valve, the online chromatograph inlet solenoid valve, the online chromatograph outlet solenoid valve, the micro-frequency conversion circulation pump outlet solenoid valve, the water inlet solenoid valve, the air release solenoid valve, the insulating oil storage tank inlet solenoid valve, the insulating oil storage tank outlet solenoid valve, the agitator, and the input end of the alarm.

[0167] The accelerated degradation test method for the insulation material of a high-voltage oil-filled cable terminal uses the accelerated degradation test device for the insulation material of a high-voltage oil-filled cable terminal described above. The test method is used for quality inspection of a high-voltage oil-filled power cable terminal having a conductive rod installed in the inner cavity and a stress cone wrapped around the insulation shield of the conductive rod joint, and includes the following steps:

[0168] Deploying a simulation environment, i.e., setting up a simulation environment containing a detachable high-voltage cable oil-filled simulation terminal; assembling the high-voltage cable oil-filled simulation terminal, wherein the high-voltage cable oil-filled simulation terminal includes a terminal body and a conductive component located within the terminal body, the terminal body having a cavity, and the insulation component to be tested is disposed within the cavity;

[0169] Inputting insulating oil or oxygen with preset parameters into the cavity of the terminal body to form a simulated environment;

[0170] Adjust the simulation environment, and then monitor the surface temperature and pressure changes of the stress cone remotely to accelerate the degradation of the insulating oil, insulation material and stress cone used in the oil-filled terminal of the high-voltage cable to identify their quality;

[0171] Check for structural damage to other components inside the oil filling terminal;

[0172] Provide current and voltage within the preset range to the high voltage cable oil-filled simulation terminal;

[0173] Detect the preset parameters of the insulation components to be tested in the high-voltage cable oil-filled simulation terminal and obtain test data.

[0174] Before performing the accelerated degradation test, the stress cone is covered with insulating material and assembled in a simulation terminal. Insulating oil is then filled in. The accelerated degradation test is monitored under set time and conditions. The monitoring data is recorded and used as a standard for comparison.

[0175] The accelerated degradation test is a high voltage, high current accelerated degradation test under hot oil and high humidity conditions, or a high heat and oxygen accelerated degradation deformation test.

[0176] The step of inputting the insulating oil with preset parameters into the cavity of the terminal body comprises: filling the cavity of the terminal body with insulating oil with preset temperature and humidity.

[0177] The inputting of oxygen with preset parameters into the cavity of the terminal body includes: inputting oxygen with a preset pressure, a preset temperature, and a preset flow rate into the cavity of the terminal body.

[0178] The method of providing a current and a voltage within a preset range to the high-voltage cable oil-filled simulation terminal includes:

[0179] The high-voltage output device is electrically connected to the conductive component; the high-voltage output device is used to provide a preset range of voltage and current to the high-voltage cable oil-filled simulation terminal.

[0180] Detecting preset parameters of the insulation component to be tested in the high-voltage cable oil-filled simulation terminal and obtaining detection data includes: setting the insulation component to be tested on the inner wall of the cavity and / or the outer wall of the conductive component; and obtaining the preset parameters of the insulation component to be tested through the detection equipment.

[0181] The detection equipment includes multiple temperature sensors, multiple pressure sensors, and multiple visual sensors. Some temperature sensors are arranged on the inner walls of the first cavity and the second cavity, and the remaining temperature sensors are arranged on the outer wall of the stress cone; some pressure sensors are arranged on the inner walls of the first cavity and the second cavity, and the remaining pressure sensors are arranged on the outer wall of the stress cone; multiple visual sensors are arranged at intervals on the inner walls of the first cavity and the second cavity;

[0182] The temperature sensor is used to collect temperature data of the simulated environment.

[0183] The pressure sensor is used to collect pressure data of the simulated environment.

[0184] The visual sensor is used to collect appearance change data of the tested samples in the simulated environment.

[0185] The detection equipment also includes a chromatograph, which connects the insulating oil in the cavity with the first small tube and the second small tube to sample the insulating oil and detect changes in the insulating oil in the simulated environment.

[0186] After the step of detecting preset parameters of the components to be tested in the high-voltage cable oil-filled simulation terminal and obtaining detection data, the method further includes: issuing an alarm when the obtained detection data is greater than a threshold.

[0187] When performing the high voltage and high current accelerated degradation test, the insulating paint to be tested is sprayed on the inner wall of the cavity of the terminal body and dried and solidified; the insulating component to be tested of the test sample is set in the inner cavity, and the insulating component to be tested includes a conductive rod 12, a stress cone 13 of the conductive rod, an insulating tape 14, and an insulating cable 42 for electrical connection.

[0188] The insulation assembly to be tested includes a stress cone and an insulation tape which are arranged at intervals along the axial direction in the middle of a conductive rod; the lower end of the conductive rod is connected to the insulated cable;

[0189] After completing the test environment layout, perform high voltage and high current accelerated degradation tests, or perform high heat and oxygen accelerated degradation deformation tests.

[0190] Example:

[0191] In this example, an accelerated degradation test device for high-voltage oil-filled cable terminal insulation materials is used to perform a high-voltage, high-current accelerated degradation test. The specific operating steps of the test method are as follows:

[0192] Step A1: Loosen the fastening bolts in the fasteners of the simulation terminal, open the two-piece porcelain shell cavity and inner cavity of the simulation terminal, evenly spray the insulating paint to be tested on the inner wall of the inner cavity of the simulation terminal, and dry and solidify;

[0193] Step A2: Assemble the insulation material to be tested, including the simulated terminal conductive rod, stress cone, and insulating tape, into the inner cavity of the simulated terminal. After assembly, close the two halves of the simulated terminal and tighten the fastening bolt assembly.

[0194] Step A3: Connect the high-temperature insulating oil device to the pipeline of the simulation terminal cavity;

[0195] Step A4: turning on the stirrer, arc-shaped electric heating block, online trace moisture meter, and spray water inlet solenoid valve of the moist high-temperature insulating oil module to stir, heat, and humidify the insulating oil in the moist high-temperature insulating oil storage tank. When the set temperature and trace moisture content are reached, the arc-shaped electric heating block, the spray water inlet solenoid valve, and the stirrer are turned off to stop heating and spraying.

[0196] Step A5: Open the first solenoid valve and the second solenoid valve of the simulation terminal, open the outlet solenoid valve and the inlet solenoid valve of the insulating oil storage tank,

[0197] Step A6: Open the outlet solenoid valve of the micro-variable frequency circulation pump and the micro-variable frequency circulation pump to pump the insulating oil heated and humidified to the set value in the insulating oil storage tank into the simulation terminal, thereby forming an oil flow circulation;

[0198] Step A7: The insulating oil flow sensor and the control module automatically control the output of the micro-frequency conversion circulation pump to output stable high-heat and high-humidity insulating oil;

[0199] Step A8: Turn on the online chromatograph, the online chromatograph inlet solenoid valve, the online chromatograph outlet solenoid valve, and the first micro temperature and pressure sensor, the second micro air temperature sensor, the first micro air pressure sensor, the second micro air pressure sensor, and several micro air wide-angle vision sensors built into the simulation terminal to perform online monitoring of the characteristic gas component content in the insulating oil inside the simulation terminal, the stress cone, the insulating tape, the position and deformation of other internal insulating components, the stress cone temperature, and the interface pressure.

[0200] Step A9: Electrically connecting a high-voltage output device to the simulation terminal. The high-voltage output device is used to provide a certain range of high voltage and high current to the simulation terminal to provide testing conditions for accelerated degradation and miscibility of insulating oil and insulating materials containing a certain amount of moisture inside the simulation terminal under high voltage and high current environments. In particular, for accelerated degradation testing of stress cones, the shunt load and voltage divider load in the high-voltage output device serve to stabilize the high voltage and high current electrical testing of the simulation terminal.

[0201] Step A10: firstly ground the high voltage output device, the primary voltage regulator, the voltage divider load, and the current divider load;

[0202] Step A11: Connect the output insulated cable in parallel to one end of the simulated terminal conductive rod and the shunt load, and connect the loop cable in series to the other end of the conductive rod;

[0203] Step A12: During the operation of high-voltage output equipment, workers must maintain a safe distance from live parts that is sufficient to meet the corresponding voltage level;

[0204] Step A13: Slowly start the primary voltage regulator to boost the voltage, and the high-voltage output device transforms the voltage to high voltage. When the set voltage and current values are reached, stop the primary voltage regulator to boost the voltage and maintain it;

[0205] Step A14: During the monitoring period of the set time, if the characteristic gas component content in the insulating oil, the stress cone overheating or the interface pressure exceeds the standard, or the stress cone, the insulation tape and other internal insulation components move or deform beyond the set value, as long as any of the above indicators exceeds the preset value, the alarm will sound, indicating that the insulation component is unqualified;

[0206] Step A15: After the high-voltage, high-current accelerated degradation test under hot oil and high-humidity conditions is completed, first reduce the voltage of the primary voltage regulator to zero, then use an insulated ground rod to discharge the corresponding part, and then remove the electrical connection between the high-voltage output device and the simulation terminal;

[0207] Step A16: After removing the electrical connection between the high-voltage output device and the simulation terminal, turn off the online chromatograph, the online chromatograph inlet solenoid valve, the online chromatograph outlet solenoid valve, the micro-frequency conversion circulation pump, the first solenoid valve of the simulation terminal, the outlet solenoid valve of the micro-frequency conversion circulation pump, the outlet solenoid valve of the insulating oil storage tank, and the micro-spaced wide-angle vision sensor built into the simulation terminal in sequence;

[0208] Step A17: After all the insulating oil in the simulation terminal flows back to the insulating oil storage tank, close the second solenoid valve of the simulation terminal and the inlet solenoid valve of the insulating oil storage tank;

[0209] Step A18: Remove the connecting pipes, loosen the fastening bolts of the simulation terminal, open the inner cavity of the simulation terminal, remove the conductive rod, stress cone, and insulation tape, and clean the inner cavity of the simulation terminal in preparation for the next test;

[0210] The high heat oxygen accelerated degradation deformation test includes the following steps:

[0211] Step B1: Loosen the fastening bolts of the simulation terminal, open the inner cavity of the simulation terminal, evenly spray the insulating paint to be tested on the inner wall of the inner cavity of the simulation terminal, and dry and solidify;

[0212] Step B2: Assemble the conductive rod, stress cone, insulation tape and other insulation parts into the inner cavity of the simulation terminal. After assembly, close the two halves of the simulation terminal and tighten the fastening bolts.

[0213] Step B3, connecting the high-purity and high-heat oxygen module to the simulation terminal;

[0214] Step B4, sequentially turning on the first solenoid valve of the simulation terminal, the oxygen pressure and flow stabilization solenoid valve, the oxygen pressure and flow stabilization sensor, the first micro temperature and pressure sensor in the simulation terminal, the second micro spaced temperature sensor, the first micro spaced pressure sensor, the second micro spaced pressure sensor, and several micro spaced wide-angle vision sensors;

[0215] Step B5: Open the high-pressure high-purity oxygen cylinder valve of the high-purity and high-heat oxygen module and adjust the pressure reducing valve to the set pressure;

[0216] Step B6: Turn on the electric heating tube of the high-purity and high-heat oxygen module to heat the oxygen flowing into the inner cavity of the simulation terminal to a set temperature;

[0217] Step B7: The oxygen pressure and flow stabilization sensor automatically controls the oxygen pressure and flow stabilization solenoid valve to maintain the delivery of oxygen at a stable pressure and flow rate;

[0218] Step B8: When the second micro air-tight pressure sensor in the simulation terminal detects that the pressure reaches the set value, the deflation solenoid valve is opened to an appropriate opening degree to maintain the pressure in the internal cavity of the simulation terminal within the set value range;

[0219] Step B9: Several micro-spaced wide-angle vision sensors built into the simulation terminal respectively perform online monitoring of the position and deformation of the stress cone, insulation tape, and other insulation components inside the simulation terminal;

[0220] Step B10: If any one of the indicators, such as the position and deformation of the stress cone, insulation tape, and other insulating components, exceeds a preset value within the set monitoring period, it indicates that the insulation material is unqualified and an alarm is sounded. Similarly, if the surface temperature or interface pressure of the stress cone exceeds a preset value, it indicates that the stress cone is unqualified and an alarm is sounded.

[0221] Step B11: After the test is completed, turn off the electric heating tube first. After the temperature drops to room temperature, close the high-pressure and high-purity oxygen cylinder valve, the pressure reducing valve, the oxygen pressure and flow stabilizing solenoid valve, the oxygen pressure and flow stabilizing sensor, the micro-spaced pressure sensor in the simulation terminal, the micro-spaced wide-angle visual sensor, the simulation terminal outlet pipe venting solenoid valve, and the first solenoid valve in sequence.

[0222] Step B12: After the inner cavity of the simulation terminal is free of pressure, loosen the fastening bolts of the simulation terminal, open the inner cavity of the simulation terminal, remove the conductive rod, stress cone, insulation tape and other insulation components, and clean the inner cavity of the simulation terminal in preparation for the next test.

Claims

1. Accelerated degradation test device for high-voltage oil-filled cable terminal insulation materials, used for quality inspection of high-voltage oil-filled cable terminals, characterized by: The accelerated degradation test device includes a simulation terminal, insulating oil equipment, high-voltage output equipment, detection equipment and control module; The simulation terminal is a high-voltage cable oil-filled simulation terminal, comprising a terminal body and a conductive component located inside the terminal body. The terminal body has a cavity, and an insulation component to be tested is arranged in the cavity and / or the conductive component. The terminal body is connected to an environmental simulation device with a built-in insulating oil device, and the environmental simulation device is used to input insulating oil or oxygen with preset parameters into the cavity of the terminal body to form a simulated environment; The high-voltage output device is electrically connected to the conductive component, and is used to provide current and voltage within a preset range to the high-voltage cable oil-filled simulation terminal; the detection device is connected to the high-voltage cable oil-filled simulation terminal, and is used to detect the preset parameters of the insulation component to be tested in the high-voltage cable oil-filled simulation terminal; the control module is used to control the opening or closing of the high-voltage output device and / or the environmental simulation device, and to control the operation of the detection device.

2. The accelerated degradation test device for high-voltage oil-filled cable terminal insulation material according to claim 1, characterized in that: The terminal body includes a first cavity and a second cavity which can be detached into two parts, and the first cavity and the second cavity can be fastened and sealed; The conductive component includes a conductive rod, and the insulating component to be tested includes a stress cone and an insulating tape arranged at intervals along the axial direction in the middle of the conductive rod. The conductive component is arranged in a cavity formed by the first cavity and the second cavity, and the two ends of the conductive rod protrude from the terminal body, and the stress cone and the insulating tape are located in the cavity of the terminal body.

3. The accelerated degradation test device for high-voltage oil-filled cable terminal insulation material according to claim 2, characterized in that: The insulation component to be tested also includes insulation paint sprayed on the inner walls of the first cavity and the second cavity; the stress cone is wrapped around the outside of the connector shielding insulation layer of the conductive rod in the simulation terminal.

4. The accelerated degradation test device for high-voltage oil-filled cable terminal insulation material according to claim 3, characterized in that: The environmental simulation device includes an oxygen supply device, the terminal body includes an inlet and an outlet, the oxygen supply device is connected to the inlet through a first pipe, and the oxygen supply device is used to input oxygen with a preset pressure, preset temperature, and preset flow into the cavity of the terminal body.

5. The accelerated degradation test device for high-voltage oil-filled cable terminal insulation material according to claim 4, characterized in that: The oxygen supply equipment uses a high-purity, high-temperature oxygen module to provide high-pressure, high-temperature oxygen to the simulated environment, and conducts accelerated degradation tests on the internal components of the simulated terminal. The high-purity, high-temperature oxygen module outputs high-purity, high-temperature oxygen into the inner cavity of the simulated terminal; A vent solenoid valve is provided at the outlet pipe of the simulation terminal to adjust the pressure in the simulation terminal cavity and to discharge the oxygen in the simulation terminal cavity after the test is completed; The high-purity and high-heat oxygen module includes: a high-pressure high-purity oxygen cylinder, a pressure reducing valve, a pressure and flow stabilizing solenoid valve, a pressure and flow stabilizing sensor, an electric heating tube, a third temperature sensor, a third solenoid valve, and a gas release solenoid valve; The outlet of the high-pressure and high-purity oxygen cylinder is connected in sequence with a pressure reducing valve, a pressure and flow stabilizing solenoid valve, a pressure and flow stabilizing sensor, an electric heating tube, a first small tube solenoid valve, a first small tube, and an inner cavity of a simulation terminal; The pressure and flow stabilization sensor is installed on the pipe between the pressure and flow stabilization solenoid valve and the electric heating tube. It is used to sense the flow and pressure of the output oxygen online and transmit the data to the control module. The control module controls the pressure and flow stabilization solenoid valve to output stable oxygen according to the set pressure and flow value. The third temperature sensor is installed at the outlet of the electric heating tube to control the output oxygen to be heated to a set temperature value.

6. The accelerated degradation test device for high-voltage oil-filled cable terminal insulation material according to claim 3, characterized in that: The detection equipment is a monitoring device connected to a simulated power high-voltage oil-filled cable terminal test device to monitor changes in the simulated environment; The detection equipment includes an air-to-air wireless monitoring and transmission device, which includes multiple temperature sensors, multiple pressure sensors and multiple visual sensors. Some temperature sensors are arranged on the inner walls of the first cavity and the second cavity, and the remaining temperature sensors are arranged on the outer wall of the stress cone; some pressure sensors are arranged on the inner walls of the first cavity and the second cavity, and the remaining pressure sensors are arranged on the outer wall of the stress cone; multiple visual sensors are arranged at intervals on the inner walls of the first cavity and the second cavity, multiple temperature sensors are used to collect temperature data of the simulated environment, multiple pressure sensors are used to collect pressure data of the simulated environment, and multiple visual sensors are used to collect appearance image data of the insulating components to be tested.

7. The accelerated degradation test device for high-voltage oil-filled cable terminal insulation material according to claim 3, characterized in that: The environmental simulation equipment also includes an insulating oil device. The terminal body includes an inlet and an outlet. One end of the insulating oil device is connected to the inlet through a second pipe, and the other end is connected to the outlet through a third pipe. The insulating oil device is used to fill the cavity of the terminal body with insulating oil of preset temperature and humidity.

8. The accelerated degradation test device for high-voltage oil-filled cable terminal insulation material according to claim 7, characterized in that: The insulating oil equipment includes an insulating oil storage tank, a heating block for heating the insulating oil is provided outside the insulating oil storage tank, the outlet of the terminal body is connected to the inlet end of the insulating oil storage tank through a third pipe, and the inlet of the terminal body is connected to the outlet end of the insulating oil storage tank through a second pipe; A micro variable frequency circulation pump and an insulating oil flow sensor are provided on the second pipeline. The flow sensor is used to detect the real-time flow in the second pipeline and feed back the detection results to the control module. The control module adjusts the open circuit size of the circulation pump according to the preset flow value.

9. The accelerated degradation test device for high-voltage oil-filled cable terminal insulation material according to claim 8, characterized in that: The insulating oil storage tank is also provided with an agitator, which includes a stirring motor and a stirring blade. The stirring blade is located in the cavity of the insulating oil storage tank. The stirring motor drives the stirring blade to rotate to stir the insulating oil in the insulating oil storage tank.

10. The accelerated degradation test device for high-voltage oil-filled cable terminal insulation material according to claim 8, characterized in that: The insulating oil storage tank is also provided with a sprayer and an online trace moisture meter. The sprayer is used to spray high-purity deionized water into the insulating oil storage tank, and the online trace moisture meter is used to detect the trace water content of the insulating oil in the insulating oil storage tank.

11. The accelerated degradation test device for high-voltage oil-filled cable terminal insulation material according to claim 7, characterized in that: Testing equipment also includes online chromatograph; A first small tube is provided at the sample outlet of the online chromatograph, and a second small tube is provided at the sample inlet; The top of the online chromatograph is provided with an injection port, which is sequentially connected to a chromatograph inlet solenoid valve, a second micro solenoid valve, a second small tube, and an inner cavity of the simulation terminal; A sample outlet is installed on one side of the online chromatograph, and the sample outlet is sequentially connected to the chromatograph outlet solenoid valve, the inlet of the micro-variable frequency circulation pump, the outlet solenoid valve of the micro-variable frequency circulation pump, the first small tube solenoid valve, the first small tube, and the inner cavity of the simulation terminal; The online chromatograph is connected to the insulating oil in the simulation terminal cavity through the first small tube and the second small tube to sample the insulating oil and detect changes in the insulating oil in the simulation environment.

12. The accelerated degradation test device for high-voltage oil-filled cable terminal insulation material according to any one of claims 1 to 11, characterized in that: The voltage output end of the high-voltage output device is provided with a primary voltage regulator, a high-voltage output device, and an output insulated cable; the high-voltage output device also includes a loop insulated cable, a shunt load, and a voltage divider load; the shunt load and the voltage divider load are grounded; The high voltage output device and the current divider load device are electrically connected to one end of the conductive component respectively, and the voltage divider load device is electrically connected to the other end of the conductive component; The output insulated cable is respectively connected to the lower end of the simulated terminal conductive rod and the shunt load, and the loop insulated cable is respectively connected to the upper end of the conductive rod and the voltage divider load. The shunt load and the voltage divider load are both grounded.

13. A method for accelerating degradation testing of insulation materials for high-voltage oil-filled cable terminals, using the accelerated degradation testing apparatus for insulation materials for high-voltage oil-filled cable terminals according to any one of claims 1 to 12, characterized in that: The test method is used for quality inspection of an oil-filled terminal of a power high-voltage cable with a conductive rod installed in the inner cavity and a stress cone wrapped around the insulating shielding layer of the conductive rod joint, and comprises the following steps: Deploying a simulation environment, i.e., setting up a simulation environment containing a detachable high-voltage cable oil-filled simulation terminal; assembling the high-voltage cable oil-filled simulation terminal, wherein the high-voltage cable oil-filled simulation terminal includes a terminal body and a conductive component located within the terminal body, the terminal body having a cavity, and the insulation component to be tested is disposed within the cavity; Inputting insulating oil or oxygen with preset parameters into the cavity of the terminal body to form a simulated environment; Adjust the simulation environment, and then monitor the surface temperature and pressure changes of the stress cone remotely to accelerate the degradation of the insulating oil, insulation material and stress cone used in the oil-filled terminal of the high-voltage cable to identify their quality; Check for structural damage to other components inside the oil filling terminal; Provide current and voltage within the preset range to the high voltage cable oil-filled simulation terminal; Detect the preset parameters of the insulation components to be tested in the high-voltage cable oil-filled simulation terminal and obtain test data.

14. The accelerated degradation test method for high-voltage oil-filled cable terminal insulation material according to claim 13, characterized in that: Before performing the accelerated degradation test, the stress cone is covered with insulating material and assembled in a simulation terminal. Insulating oil is then filled in. The accelerated degradation test is monitored under set time and conditions. The monitoring data is recorded and used as a standard for comparison. The accelerated degradation test is a high voltage, high current accelerated degradation test under hot oil and high humidity conditions, or a high heat and oxygen accelerated degradation deformation test.

15. The accelerated degradation test method for high-voltage oil-filled cable terminal insulation material according to claim 13, characterized in that: The step of inputting the insulating oil with preset parameters into the cavity of the terminal body comprises: filling the cavity of the terminal body with insulating oil with preset temperature and humidity.

16. The accelerated degradation test method for high-voltage oil-filled cable terminal insulation material according to claim 13, characterized in that: The inputting of oxygen with preset parameters into the cavity of the terminal body includes: inputting oxygen with a preset pressure, a preset temperature, and a preset flow rate into the cavity of the terminal body.

17. The accelerated degradation test method for high-voltage oil-filled cable terminal insulation material according to claim 13, characterized in that: Providing current and voltage within a preset range to the high-voltage cable oil-filled simulation terminal includes: electrically connecting a high-voltage output device to a conductive component; the high-voltage output device is used to provide voltage and current within a preset range to the high-voltage cable oil-filled simulation terminal.

18. The accelerated degradation test method for high-voltage oil-filled cable terminal insulation material according to claim 13, characterized in that: Detecting preset parameters of the insulation component to be tested in the high-voltage cable oil-filled simulation terminal and obtaining detection data includes: setting the insulation component to be tested on the inner wall of the cavity and / or the outer wall of the conductive component; and obtaining the preset parameters of the insulation component to be tested through the detection equipment.

19. The accelerated degradation test method for high-voltage oil-filled cable terminal insulation material according to claim 18, characterized in that: The detection equipment includes multiple temperature sensors, multiple pressure sensors, and multiple visual sensors. Some temperature sensors are arranged on the inner walls of the first cavity and the second cavity, and the remaining temperature sensors are arranged on the outer wall of the stress cone; some pressure sensors are arranged on the inner walls of the first cavity and the second cavity, and the remaining pressure sensors are arranged on the outer wall of the stress cone; multiple visual sensors are arranged at intervals on the inner walls of the first cavity and the second cavity; The temperature sensor is used to collect temperature data of the simulated environment. The pressure sensor is used to collect pressure data of the simulated environment. The visual sensor is used to collect appearance change data of the tested samples in the simulated environment.

20. The accelerated degradation test method for high-voltage oil-filled cable terminal insulation material according to claim 19, characterized in that: The detection equipment also includes a chromatograph, which connects the insulating oil in the cavity with the first small tube and the second small tube to sample the insulating oil and detect changes in the insulating oil in the simulated environment.

21. The accelerated degradation test method for high-voltage oil-filled cable terminal insulation material according to claims 13-20, characterized in that: After the steps of detecting preset parameters of the components to be tested in the high-voltage cable oil-filled simulation terminal and obtaining detection data, the method further includes: issuing an alarm when the obtained detection data is greater than a threshold value.

22. The accelerated degradation test method for high-voltage oil-filled cable terminal insulation material according to claim 14, characterized in that: When performing a high-voltage, high-current accelerated degradation test, the insulating paint to be tested is sprayed onto the inner wall of the cavity of the terminal body and dried and cured. The insulating assembly to be tested of the test sample is placed in the inner cavity. The insulating assembly to be tested includes a conductive rod, a stress cone of the conductive rod, an insulating tape, and an insulating cable for electrical connection. The insulating assembly to be tested includes a stress cone and an insulating tape spaced axially in the middle of the conductive rod. The lower end of the conductive rod is connected to the insulating cable. After completing the test environment layout, perform high voltage and high current accelerated degradation tests, or perform high heat and oxygen accelerated degradation deformation tests.

Images