A multi-cavity cable material aging and electrical performance in-situ measurement device and method

Abstract

The application provides a multi-cavity cable material aging and electrical property in-situ measurement device and method, which comprises a box, a plurality of cavities and a communication area are arranged in the box, and each cavity is independent of each other; a humidity sensor and a temperature sensor are arranged above each cavity; an independent temperature control unit is arranged in each cavity; the communication area is communicated with each cavity respectively, a pressure controller is arranged in the communication area, the pressure controller is connected with each cavity through a pipeline; a humidity controller is further arranged in the communication area, and the humidity controller is used for controlling the humidity in each cavity; an electric current test end, a semi-conductive volume resistivity test end and a breakdown voltage test end are arranged in each cavity respectively; a control device is arranged on the box, and the control device is electrically connected with each sensor and controller. The application can realize the synchronous aging and in-situ measurement test of multiple chambers under the same air pressure and humidity.

Description

Technical Field

[0001] This invention belongs to the field of cable sample aging test technology, and relates to an in-situ measurement device and method for aging and electrical properties of multi-cavity cable materials. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] As cables operate for longer periods, they age under thermal stress, leading to a decline in their electrical and mechanical properties, which can cause safety accidents and affect their stable operation. Therefore, research on the thermal aging performance of cables is of great practical significance.

[0004] Currently, the ovens used for cable sample aging are not dedicated equipment for cable thermal aging tests. Although they can perform thermal aging on samples, they cannot conduct aging of insulation layers, semiconducting layers, and composite sample layers at different temperatures under the same pressure and humidity conditions. Furthermore, they cannot meet the aging requirements of maintaining the internal temperature gradient distribution during sample thermal aging, and the accuracy of test data is affected by changes in environmental factors such as air pressure, temperature, and humidity when the aged samples are removed for testing. Summary of the Invention

[0005] To address the aforementioned problems, this invention proposes an in-situ measurement device and method for the aging and electrical properties of multi-chamber cable materials. This invention can achieve synchronous aging and in-situ measurement tests under the same air pressure and humidity in multiple chambers.

[0006] According to some embodiments, the present invention adopts the following technical solution:

[0007] A multi-cavity cable material aging and electrical performance in-situ measurement device includes a housing, wherein multiple cavities and connected areas are provided inside the housing, and each cavity is independent of the others.

[0008] Each cavity is equipped with a humidity sensor and a temperature sensor.

[0009] Each chamber is equipped with an independent temperature control unit;

[0010] The connecting area is connected to each cavity respectively, and a pressure controller is installed inside. The pressure controller is connected to each cavity respectively through pipelines.

[0011] A humidity controller is also provided in the connected area, which is used to control the humidity in each cavity;

[0012] Each cavity is equipped with a conductivity current test terminal, a semiconducting volume resistivity test terminal, and a breakdown voltage test terminal.

[0013] The box is provided with a control device, which is electrically connected with each sensor and the controller.

[0014] In the above scheme, at least three cavities are provided as insulation sample aging cavities, semi-conductive sample aging cavities and insulation-semi-conductive composite sample aging cavities, and the aging test can be performed in response, each cavity is connected through a communication area, and a humidity controller and a pressure controller are uniformly arranged in the communication area, so that the insulation layer, the semi-conductive layer and the composite sample layer can be aged at different temperatures in the same pressure and humidity environment.

[0015] As an alternative embodiment, a gas detection sensor is arranged in each cavity, and the gas detection sensor is connected with the control device.

[0016] By arranging the gas detection sensor in each cavity, the elements generated after aging of different samples can be analyzed to assist in analyzing the mechanism of thermal aging of the sample.

[0017] As an alternative embodiment, the cavity includes at least three.

[0018] As an alternative embodiment, the temperature control unit of each cavity is arranged in the middle of the cavity.

[0019] As an alternative embodiment, the conductive current test end includes two columnar electrodes arranged in an upper and lower manner, the sample to be aged is placed between the columnar electrodes, and the temperature control unit is used to control the temperature of the upper and lower columnar electrodes to be different to form a temperature gradient.

[0020] As an alternative embodiment, the semi-conductive volume resistivity test end includes epoxy resin test plates arranged in parallel in an upper and lower manner, each end of the epoxy resin test plates is provided with a power supply electrode, a potential electrode is inserted into the upper epoxy resin test plate, and the temperature control unit is used to set the temperature of the two epoxy resin test plates to be different to form a temperature gradient for aging.

[0021] As an alternative embodiment, the breakdown voltage test end includes a container, the container is provided with two columnar electrodes arranged in an upper and lower manner, the sample to be aged is placed between the columnar electrodes, the container contains silicon oil, and the sample is soaked in the silicon oil, and the temperature control unit is used to control the temperature of the upper and lower columnar electrodes to be different to form a temperature gradient.

[0022] The above electrodes are connected with a voltage source device.

[0023] As a further embodiment, a mechanical vibration device is arranged at the lower end of each test end.

[0024] As an alternative embodiment, a smoke sensor is arranged at the top of each cavity.

[0025] As an alternative embodiment, the box is provided with heat insulation cotton, and the box / cavity is provided with a wire outlet, and the wire outlet is provided with high-temperature-resistant sealing material.

[0026] A working method based on the above device, comprising the following steps:

[0027] According to the different tests of the aging sample, different samples are placed in the corresponding cavities.

[0028] Through the pressure controller and the humidity controller of the communication area, the pressure and humidity in each cavity are ensured to be the same.

[0029] By using the temperature control unit arranged in each cavity, the aging temperature of the upper and lower surfaces of the sample is adjusted, so that there is a gradient temperature difference in the sample.

[0030] The corresponding electrode is turned on to perform the aging test.

[0031] The temperature, humidity, temperature and aging results are recorded, and according to the detection information of the gas detection sensor, the elements generated after the aging of different samples are analyzed, and the mechanism of the thermal aging of the sample is analyzed.

[0032] Compared with the prior art, the beneficial effects of the present application are:

[0033] The present application can perform multi-chamber synchronous aging and in-situ measurement test under the same pressure and humidity. The cavities are mutually sealed, and the aging temperatures of different samples do not affect each other; according to the needs, the multiple sealed cavities can also be communicated, so that the test conditions are completely consistent, and have certain flexibility.

[0034] The present application is provided with a separate temperature control unit in each cavity, which can adjust the aging temperature of the upper and lower surfaces of the aging sample, so that there is a gradient temperature difference in the sample, and the temperature gradient is formed for aging.

[0035] The present application is also provided with a smoke sensor, which realizes automatic alarm and remote control of the aging box to be closed, and prevents safety problems from occurring when unattended.

[0036] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are used for explanation. BRIEF DESCRIPTION OF DRAWINGS

[0037] The drawings accompanying the specification of the present application form part of the present application and are used to provide further understanding of the present application, and the schematic embodiments of the present application and the description thereof are used to explain the present application, and do not constitute improper limitation on the present application.

[0038] Figure 1It is a kind of multi-cavity cable material aging and electrical performance in situ measurement device structure diagram;

[0039] Figure: 1 - outlet, 2 - box, 3 - temperature control unit, 4 - insulation sample aging cavity, 5 - electric current test end, 6 - semi-conductive sample aging cavity, 7 - semi-conductive volume resistivity test end, 8 - insulation-semi-conductive composite sample aging cavity, 9 - breakdown voltage test end, 10 - remote control module, 11 - protector, 12 - temperature setting panel, 13 - switch, 14 - buzzer, 15 - alarm lamp, 16 - humidity controller, 17 - humidity sensor, 18 - smoke sensor, 19 - gas detection sensor, 20 - pressure controller. DETAILED DESCRIPTION

[0040] The application will be further described below with reference to the drawings and examples.

[0041] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0042] It should be noted that the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, they refer to the presence of a feature, step, operation, device, component, and / or combination thereof.

[0043] As shown in Figure 1 A multi-cavity cable material aging and electrical performance in situ measurement device includes a box 2, the box 2 is provided with an insulation sample aging cavity 4, a semi-conductive sample aging cavity 6, and an insulation-semi-conductive composite sample aging cavity 8, and the three aging cavities are placed for thermal aging of different samples.

[0044] In this embodiment, the insulation sample aging cavity 4, the semi-conductive sample aging cavity 6, and the insulation-semi-conductive composite sample aging cavity 8 are arranged side by side at the bottom of the box 2 and are separated from each other by a cavity wall.

[0045] Above the insulation sample aging cavity 4, the semi-conductive sample aging cavity 6, and the insulation-semi-conductive composite sample aging cavity 8, a communication area is provided in the box 2.

[0046] In this embodiment, the communication area and each aging cavity are in communication. The humidity controller 16 and the pressure controller 20 are provided in the communication area to control the humidity and pressure inside the three cavities to be the same value, which can reduce the environmental error of the test.

[0047] Of course, in order to ensure the sealing of the good experimental environment, in this embodiment, the pressure controller 20 and the humidity controller 16 can be extended into each aging chamber through the pipeline, and the connection between the pipeline and the wall surface of the aging chamber is provided with a sealing device.

[0048] The temperature control of each aging chamber is controlled by the temperature control unit in the chamber. The pressure and humidity control is that the controller is connected to the three aging chambers through the pipeline, the sealing device is arranged at the interface between the pipeline and the wall surface, the one-way valve is arranged in the pipeline, and the three aging chambers are independent of each other.

[0049] In each aging chamber, a gas detection sensor 19, a smoke sensor 18 and a humidity sensor 17 are arranged.

[0050] In each aging chamber, an independent temperature control unit 3 is matched, which can adjust the aging temperature of the upper and lower surfaces of the aging sample, so that there is a gradient temperature difference in the sample.

[0051] In this embodiment, the first chamber is an insulation sample aging chamber 4, which is used for testing the leakage current performance of the insulation sample. The conductive current test end 5 is two columnar electrodes. The sample to be aged is placed between the two electrodes. The temperature between the upper and lower electrodes can be set by the temperature control unit 3 respectively, so that the temperature gradient is formed for aging.

[0052] The second chamber is a semi-conductive sample aging chamber 6, which is used for testing the volume resistivity performance of the semi-conductive sample. The semi-conductive volume resistivity test end adopts four-electrode method. The sample is placed between the two semi-conductive volume resistivity test ends with power supply electrodes at the ends. The semi-conductive volume resistivity test end is a high-temperature epoxy resin plate for aging. The upper epoxy resin plate is inserted into the potential electrode, and the upper and lower high-temperature epoxy resin plates can be set to different temperatures by the temperature control unit 3 respectively, so that the temperature gradient is formed for aging.

[0053] The third chamber is an insulation-semi-conductive composite sample aging chamber 8, which is used for testing the breakdown performance of the insulation-semi-conductive composite sample. The breakdown voltage test end 9 adopts two columnar electrodes. The sample to be aged is placed between the two electrodes. The temperature between the upper and lower electrodes can be set by the temperature control unit 3 respectively, so that the temperature gradient is formed, and the sample is immersed in silicone oil. The silicone oil can be contained in a container and needs to be immersed in the sample to prevent air breakdown during testing.

[0054] The connecting lines of the test ends in the three chambers are made of high-temperature resistant materials (such as high-purity PVDF). The test lines are led out of the box through the outlet 1 and connected to the test equipment, and then the outlet 1 is sealed with heat insulation sealing material.

[0055] In some embodiments, in order to avoid air circulation and reduce processing difficulty, the connecting lines of the three cavities are respectively led out of the corresponding cavities, and then a same outlet 1 is adopted.

[0056] In some embodiments, the connecting lines of each cavity can also be respectively led out of the box body 2 through a same outlet 1.

[0057] The device can not only heat the sample, but also use a voltage source device to apply long-time voltage to the electrodes of each test terminal, so that the sample is in an electric-thermal combined aging environment.

[0058] In some embodiments, a mechanical vibration device can also be added at the bottom of each test terminal to realize electric-thermal-mechanical combined accelerated aging.

[0059] A gas detection sensor 19 is installed in each cavity, and the detection information can be directly uploaded, which is convenient for analyzing the elements generated after the aging of different samples and assisting in analyzing the mechanism of sample thermal aging.

[0060] The box body 2 is provided with a smoke sensor 18.

[0061] The smoke sensor 18, the temperature control unit 3, the humidity controller 16, the temperature sensor and the humidity sensor 17, and the gas detection sensor 19 can be connected to the remote control module 10 arranged outside the box body 2.

[0062] The box body 2 is also provided with a temperature setting panel 12 for connecting and transmitting corresponding control instructions to each temperature control unit 3, and is also provided with a switch 13 for controlling the operation of the entire device. The switch 13 can manually control the operation and shutdown of the aging box, and the safety of the operation of the aging box is considered.

[0063] The smoke sensor 18 and the remote control module 10 are also connected to a buzzer 14 and an alarm lamp 15. If overheating combustion occurs, the alarm lamp 15 and the buzzer 14 will issue an alarm, and the remote control module 10 will also send alarm information to the control end.

[0064] In some embodiments, a temperature sensor is also installed in each cavity.

[0065] The temperature control unit 3 and the remote control module 10 are connected, and are provided with a protector 11 which will actively disconnect the power supply when the temperature is out of control.

[0066] The remote control module 10 is mainly used to realize automatic alarm and remote control of the aging box to prevent safety problems when unattended.

[0067] The device has a plurality of box doors, and the box doors are closed by heat insulation cotton and high-temperature-resistant sealing materials, so that a fully-closed space is formed in the cavity of the aging box.

[0068] When the aging test sample is started, the temperature control units 3 are connected to the upper and lower electrodes of the sample respectively, to provide different temperatures for the electrodes, so that the temperature of the sample is distributed in a gradient. The temperature of each temperature control unit 3 can be set through the temperature setting panel 12.

[0069] When the aging of the insulating sample is completed, the leakage current of the aged insulating sample is directly tested by the conductive current test end 5. When the aging oven is installed, the high-temperature-resistant wires are used to connect the electrodes. The upper electrode is connected to the high-voltage end, and the lower electrode is connected to the ground. The connecting wires are led out from the outlet 1 and connected to the voltage source and the device for testing the leakage current.

[0070] The volume resistivity of the semi-conductive sample is tested by the semi-conductive volume resistivity test end 7. When the aging oven is installed, the high-temperature-resistant wires are used to connect the electrodes. The connecting wires are led out from the outlet 1 and connected to the semi-conductive volume resistivity tester.

[0071] The breakdown voltage of the insulating-semi-conductive composite sample is tested by the breakdown voltage test end 9. When the aging oven is installed, the high-temperature-resistant wires are used to connect the electrodes. The upper electrode is connected to the high-voltage end, and the lower electrode is connected to the ground. The connecting wires are led out from the outlet 1 and connected to the breakdown voltage tester.

[0072] A gas detection sensor 19 is installed in each test cavity to detect the elements in the gas generated after thermal aging, to assist in analyzing the mechanism of thermal aging of the sample.

[0073] Although the specific embodiments of the present application are described above with reference to the accompanying drawings, the description is not a limitation on the scope of protection of the present application. Those skilled in the art should understand that various modifications or variations can be made to the technical solutions of the present application without creative labor, and such modifications or variations are still within the scope of protection of the present application.

Claims

1. A device for in-situ measurement of aging and electrical properties of multi-cavity cable materials, characterized in that, The enclosure includes a housing, which contains multiple cavities and communicating areas, with each cavity being independent of the others. Each cavity is equipped with a humidity sensor and a temperature sensor. Each chamber is equipped with an independent temperature control unit; The connecting area is connected to each cavity respectively, and a pressure controller is installed inside. The pressure controller is connected to each cavity respectively through pipelines. A humidity controller is also provided in the connected area. The humidity controller is used to control the humidity in each cavity. The humidity controller is connected to each cavity through pipes. Each cavity contains a conductivity current test terminal, a semiconducting volume resistivity test terminal, and a breakdown voltage test terminal. The conductivity current test terminal includes two columnar electrodes arranged vertically, with the sample to be aged placed between them. The semiconducting volume resistivity test terminal includes an epoxy resin test plate arranged vertically and horizontally, with a power supply electrode at each end of the epoxy resin test plate, and a potential electrode inserted into the upper epoxy resin test plate. The breakdown voltage test terminal includes a container containing two columnar electrodes arranged vertically, with the sample to be aged placed between them. The container contains silicone oil, and the sample is immersed in the silicone oil. The enclosure is equipped with a control device, which is electrically connected to each sensor and controller.

2. The in-situ measurement device for aging and electrical properties of multi-cavity cable materials as described in claim 1, characterized in that, Each cavity is equipped with a gas detection sensor, which is connected to a control device.

3. The in-situ measurement device for aging and electrical properties of multi-cavity cable materials as described in claim 1, characterized in that, The cavity includes at least three chambers, and the temperature control unit of each chamber is located in the middle of the chamber.

4. The in-situ measurement device for aging and electrical properties of multi-cavity cable materials as described in claim 1, characterized in that, The temperature control unit in the cavity containing the conductivity current test terminal is used to control the temperature difference between the upper and lower columnar electrodes to form a temperature gradient.

5. The in-situ measurement device for aging and electrical properties of multi-cavity cable materials as described in claim 1, characterized in that, The temperature control unit in the cavity containing the semiconducting volume resistivity test terminal is used to set the temperature on the two epoxy resin test plates respectively, forming a temperature gradient for aging.

6. The in-situ measurement device for aging and electrical properties of multi-cavity cable materials as described in claim 1, characterized in that, The temperature control unit in the cavity containing the breakdown voltage test terminal is used to control the temperature difference between the upper and lower columnar electrodes to form a temperature gradient.

7. The in-situ measurement device for aging and electrical properties of multi-cavity cable materials as described in any one of claims 4-6, characterized in that, All electrodes are connected to a voltage source device; a mechanical vibration device is installed at the lower end of each test terminal.

8. The in-situ measurement device for aging and electrical properties of multi-cavity cable materials as described in claim 1, characterized in that, Each cavity is equipped with a smoke sensor at the top.

9. The in-situ measurement device for aging and electrical properties of multi-cavity cable materials as described in claim 1, characterized in that, The enclosure is equipped with heat insulation cotton, and the enclosure / cavity is provided with a cable outlet, which is provided with high-temperature resistant sealing material.

10. A method of operating the apparatus based on any one of claims 1-9, characterized in that, Includes the following steps: Depending on the type of aging test, different samples are placed in the corresponding chambers. The pressure and humidity controllers in the connected areas ensure that the pressure and humidity are the same in each cavity; By using the temperature control unit set in each cavity, the aging temperature of the upper and lower surfaces of the sample is adjusted to create a gradient temperature difference inside the sample. Turn on the corresponding electrodes and conduct an aging test; Record temperature, humidity, temperature and aging results, and analyze the elements produced after aging of different samples based on the detection information of the gas detection sensor, and analyze the mechanism of thermal aging of the samples.

Images