CN113324896B - Experimental device for be used for high tension cable buffer layer electrochemical corrosion research that blocks water - Google Patents
Experimental device for be used for high tension cable buffer layer electrochemical corrosion research that blocks water Download PDFInfo
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- CN113324896B CN113324896B CN202110581906.7A CN202110581906A CN113324896B CN 113324896 B CN113324896 B CN 113324896B CN 202110581906 A CN202110581906 A CN 202110581906A CN 113324896 B CN113324896 B CN 113324896B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/02—Electrochemical measuring systems for weathering, corrosion or corrosion-protection measurement
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/006—Investigating resistance of materials to the weather, to corrosion, or to light of metals
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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- Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables
Abstract
The invention discloses an experimental device for electrochemical corrosion research of a high-voltage cable buffer layer, which comprises a sealed cavity, and an electrode assembly, a voltage regulating assembly and a gas sensor which are arranged on the sealed cavity, wherein the electrode assembly comprises an upper electrode and a lower electrode; the voltage regulating assembly comprises a tray and a matched voltage regulating piece, and the tray is arranged at the top end part of the rod electrode I. The invention fully considers the influence of pressure and current density of the buffer layer on electrochemical corrosion in the actual cable operation, and can perform multi-factor combined corrosion research on the basis of eliminating the measurement error of the hydrogen sensor.
Description
Technical Field
The invention belongs to the technical field of power cables, and particularly relates to an experimental device for researching electrochemical corrosion of a water-blocking buffer layer of a high-voltage cable.
Background
Over the years of development, power cables are also experiencing an increasing voltage level that the cable is capable of withstanding and plays a more important role in the power system power transmission and distribution network. The 110kV high-voltage cable in China is mainly a corrugated aluminum sheath high-voltage cable, and mainly comprises a conductor 1, an inner semiconductive layer 2, an XLPE insulating layer 3, an outer semiconductive layer 4, a water-blocking buffer layer 5, an aluminum sheath 6 and an outer sheath 7 which are sequentially arranged from inside to outside as shown in figure 1; the water-blocking buffer layer is of a semi-conductive structure with longitudinal water blocking and mechanical stress buffering functions and is used for maintaining the outer semi-conductive layer and the aluminum sheath in electrical contact. As shown in fig. 2, the water-blocking buffer layer is mainly composed of a buffer cotton layer (containing carbon black) 8, a water-blocking powder layer (sodium polyacrylate) 9, and a nonwoven fabric layer (containing carbon black) 10.
In recent years, according to the running condition of national network companies, breakdown accidents of a high-voltage cable body caused by failure of a water-blocking buffer layer of the high-voltage cable occur, and the running stability of a power system is seriously threatened. According to the prior data and research, a large amount of white spots and ablation marks are found in the ineffective high-voltage cable water-blocking buffer layer; in some severe areas, the outer semiconductive layer is also corroded to different degrees, and even ablation marks appear in the crosslinked polyethylene main insulation, so that the cable is in an extremely unstable operation state due to the insulation state, and breakdown accidents are easy to occur. However, the current research is rarely performed on the electrochemical corrosion of the water-blocking buffer layer, and only the research is performed under a single electric variable or a single variable. In an actual field operation environment, the failure of the water-blocking buffer layer is often accompanied by the influence of various factors, but at present, no device can conduct multi-variable research on the electrochemical corrosion of the water-blocking buffer layer.
A part of researches show that white spots are precipitated on the surface of the ineffective water-blocking buffer layer and are internal water-blocking powder, but the ineffective water-blocking buffer layer contacts with the aluminum sheathAluminum hydroxide and the like appear on the surface, which indicates that the appearance of white powder is not only precipitation of water-blocking powder, but also accompanied by electrochemical corrosion, and aluminum hydroxide is generated in the corrosion process. A characteristic gas, hydrogen, will be produced during the electrochemical etching process. In the laboratory for detecting characteristic gases, the hydrogen sensor has the principle defect that the hydrogen sensor detects CO and H 2 There is a problem in that simultaneous detection is possible, resulting in inaccurate detection results. Furthermore, there are references indicating that precipitation of white powder is related to environmental factors, but no complete system has been experimentally studied for partial discharge that may occur in the water-blocking buffer layer and electrochemical corrosion of the water-blocking buffer layer by environmental factors.
In summary, the high-voltage cable is an important link in the cable system, plays a significant role in the power system, and the electrochemical corrosion principle of researching the failure of the water-blocking buffer layer of the high-voltage cable plays an important role in the safe operation of the high-voltage cable, but the prior art generally only can carry out experimental research on a single variable and cannot eliminate the influence of CO, so that the research and development of the experimental device for multi-factor combined corrosion has a very important meaning in the development of the power cable.
Disclosure of Invention
The invention aims to solve the problems and provide an experimental device for electrochemical corrosion research of a water-blocking buffer layer of a high-voltage cable, which fully considers the influence of pressure, temperature, humidity and current density of the water-blocking buffer layer on electrochemical corrosion in the actual cable operation, can perform single-variable research and multi-factor combined corrosion research, eliminates the measurement error of a hydrogen sensor to a certain extent by improving an electrode structure, and can further perform deep research on the water-blocking buffer layer of the high-voltage cable by combining ultraviolet and infrared detection technologies.
In order to achieve the above purpose, the experimental device for electrochemical corrosion research of the high-voltage cable water-blocking buffer layer provided by the invention comprises a sealing cavity, and an electrode assembly, a voltage regulating assembly and a gas sensor which are arranged on the sealing cavity;
the electrode assembly comprises an upper electrode and a lower electrode, wherein the upper electrode comprises a plate electrode I and a rod electrode I which are integrally formed and have a T-shaped cross section, the lower electrode comprises a plate electrode II and a rod electrode II which are integrally formed and have a T-shaped cross section, the plate electrode I and the plate electrode II are positioned in a sealed cavity and are opposite in position and are arranged in parallel, iron rings are arranged on the opposite surfaces of the plate electrode I and the plate electrode II, a cable sample is placed between the two plate electrodes of the upper electrode and the lower electrode, and the top end parts of the rod electrode I and the rod electrode II extend out of the sealed cavity from the top surface and the bottom surface of the sealed cavity respectively;
the voltage regulating assembly comprises a tray and a plurality of pressure regulating pieces with given weight, wherein the pressure regulating pieces are matched with the tray, and the tray is arranged at the top end part of the rod electrode I.
According to the experimental device for electrochemical corrosion research of the high-voltage cable water-blocking buffer layer, at least one side surface of the sealing cavity is provided with the transparent panel, so that electrical phenomena can be observed in the experimental process, such as ultraviolet rays generated by partial discharge or temperature rise caused by partial heat generation can be measured by using a handheld ultraviolet observer or infrared detector, and non-contact detection can be realized.
According to the experimental device for the electrochemical corrosion research of the high-voltage cable water-blocking buffer layer, the upper electrode and the lower electrode are respectively connected with an alternating-current voltage source for providing high-voltage electricity. Typically, the electrodes (including the upper and lower electrodes) are copper electrodes. The plate electrode I and the plate electrode II are preferably circular plate electrodes, the circular plate electrodes can effectively inhibit corona in an electrical experiment according to international standards, extra factors in the electrical experiment are eliminated, and the sizes of the plate electrodes can be adjusted under the condition of selecting different cable sample sizes for testing so as to achieve the effect of eliminating corona. By additionally arranging an iron ring on the plate electrode, the measurement error of the hydrogen sensor is eliminated by utilizing the adsorption characteristic of CO. The iron ring and the plate electrode I/II are concentric, the outer diameter of the iron ring is smaller than the diameters of the plate electrode I and the plate electrode II, and the inner diameter is equal to the outer diameter of the cable sample.
According to the experimental device for the electrochemical corrosion research of the high-voltage cable water-blocking buffer layer, the pressure applied to the cable sample can be changed by increasing or decreasing the number of the pressure regulating pieces placed on the tray, so that the electrochemical corrosion of the cable water-blocking buffer layer under different pressure conditions can be conveniently researched.
The experimental device for the electrochemical corrosion research of the high-voltage cable water-blocking buffer layer is characterized in that the gas sensor is a hydrogen sensor. In addition, in the research of electrochemical corrosion of the water-blocking buffer layer, in order to monitor the environmental temperature and humidity in the sealed cavity conveniently, the experimental device can further comprise a temperature and humidity sensor. The mounting positions of the gas sensor and the temperature and humidity sensor in the sealed cavity can be adjusted according to the actual experimental environment. A detection hole is formed in one side face of the sealed cavity, and a transmission line of the gas sensor and the temperature and humidity sensor can be connected with an upper computer and a direct current power supply through the detection hole formed in the sealed cavity. The upper computer is also connected with a voltmeter and an ammeter which are used for collecting cable sample voltage signals and current signals. The upper computer is used for collecting the temperature, humidity and gas content in the sealed cavity in real time, recording voltage signals and current signals from the cable sample and analyzing the impedance condition of the cable sample. The direct current power supply is used for supplying power to the gas sensor and the temperature and humidity sensor.
For adapting to the installation test of the sensor, preferably, an adjusting knob is further arranged on the rod electrode I or/and the rod electrode II, the adjusting knob is positioned on the outer side of the sealing cavity, and the plate electrode I or/and the plate electrode II are moved up and down through the two adjusting knobs so as to adjust the height of the cable sample in the experimental cavity, so that the sensor can better measure the change of the gas components in the cavity.
The experimental device for the electrochemical corrosion research of the high-voltage cable water-blocking buffer layer is generally manufactured by adopting the insulating material for sealing the cavity and other auxiliary components, and the insulating material can prevent an experimenter from electric shock in the experiment in the electrical experiment. Preferably, the whole sealed cavity is made of epoxy resin, and the transparent panel is an acrylic plate. The tray and the pressure regulating piece are made of epoxy resin. The sealing cavity has a certain constant temperature effect, and can ensure that the electrochemical corrosion research of the water-blocking buffer layer of the high-voltage cable is carried out under the constant temperature condition.
According to the experimental device provided by the invention, the improved electrode with the iron ring is added into the closed cavity, the voltage regulating component is arranged on the electrode, and the multi-variable electrochemical corrosion buffered by the high-voltage cable can be systematically researched by combining with the modern sensor technology. The principle of eliminating CO by using an iron ring is as follows: the CO activity is decomposed when adsorbed on the crystal surface of some substances, of which iron is at the first place, and the CO decomposition mechanism involving iron can be expressed as:
(Fe n ) crystal +CO (gas) →(Fe) Crystal ·(CO) Adsorption of
(Fe) Crystal ·(CO) Adsorption of →(Fe) Crystal C Crystal +CO 2 (gas)
CO (gas) +(Fe) Crystal ·(O) Adsorption of →CO 2 (gas) +(Fe n ) Crystal
The general chemical reaction equation is:
then by adding an iron ring on the copper electrode, the measurement error of the hydrogen sensor is eliminated by utilizing the adsorption characteristic of CO, so that the detection result is more accurate and reliable.
In addition, in order to study electrochemical corrosion of the high-voltage cable water-blocking buffer layer of the cable samples with different humidity, the cable samples can be pretreated to obtain the cable samples with different humidity (namely, the cable samples with different water contents), and then the electrochemical corrosion study is carried out on the cable samples with different humidity by sequentially adopting the experimental device provided by the invention, so as to explore electrochemical corrosion rules of the high-voltage cable water-blocking buffer layer with different humidity.
Compared with the prior art, the experimental device for the electrochemical corrosion research of the high-voltage cable water-blocking buffer layer has the beneficial effects that:
(1) According to the invention, through the sensor arranged on the cavity and the voltage regulating assembly arranged on the electrode, various influence research factors (including pressure, temperature, humidity, voltage and current) are combined through the experimental cavity, so that the experimental device has higher integration level, and can perform univariate research on electrochemical corrosion of the water-blocking buffer layer and complete multivariate influence research.
(2) The invention improves the electrode structure, and CO possibly generated in the experiment passes through the externally added iron ring, and converts or adsorbs the CO by utilizing the physical and chemical characteristics of the CO, thereby eliminating the characteristic gas H of the CO to a certain extent 2 The detection influence of the hydrogen in the cavity is eliminated, and the accuracy of the experimental result is ensured.
(3) The invention has good function expansibility, can realize wired and wireless detection in the aspect of detection modes, can replace different sensors when different environment variables need to be detected, and can realize multi-variable monitoring in the same way.
(4) The invention can also add an external circuit to realize continuous real-time study of voltage, current and impedance characteristics, which is important for electrical experiments.
(5) The invention is easy to use, can make corresponding adjustment to different experimental requirements, and has the characteristics of easy function expansion on the device and on-line monitoring control realization.
Drawings
FIG. 1 is a schematic view of a high voltage cable;
FIG. 2 is a block diagram of a water-blocking buffer layer of a high voltage cable;
FIG. 3 is a schematic structural diagram of an experimental device for electrochemical corrosion study of a water-blocking buffer layer of a high-voltage cable;
FIG. 4 is a schematic view of the structure of the upper electrode;
fig. 5 is a schematic application diagram of an experimental device for electrochemical corrosion study of a water-blocking buffer layer of a high-voltage cable in an embodiment.
Reference numerals illustrate: 1-conductors; 2-an inner semiconductive layer; a 3-XLPE insulating layer; 4-an outer semiconductive layer; 5-a water-blocking buffer layer; 6-aluminum sheath; 7-an outer sheath; 8-a buffer cotton layer; 9-a water-blocking powder layer; 10-a non-woven fabric layer; 11-sealing the cavity; 1101-detecting hole; 12-an electrode assembly; 1201-upper electrode; 1201 a-plate electrode I;1201 b-rod electrode I;1201 c-an iron ring; 1202-a lower electrode; 1203-adjust knob; 13-a tray; 14-a hydrogen sensor; 15-a temperature and humidity sensor; 16-STM32 singlechip; 17-an ac voltage source; 18-ammeter; 19-a first protection resistor; 20-voltmeter; 21-a direct current power supply; 22-a second protection resistor; 23-upper computer.
Detailed Description
In order to clearly and fully describe the technical solutions of the various embodiments of the invention, reference should be made to the accompanying drawings, it is apparent that the described embodiments are only some embodiments of the invention, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden on the person of ordinary skill in the art based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 3, the experimental device for electrochemical corrosion study of a high-voltage cable water-blocking buffer layer provided in this embodiment includes a sealed cavity 11, an electrode assembly 12, a voltage regulating assembly, a hydrogen sensor 14, and a temperature and humidity sensor 15.
As shown in fig. 3, the sealed cavity 11 has a rectangular parallelepiped shape, and one side surface thereof is a transparent panel. The whole sealed cavity is made of epoxy resin, wherein the transparent panel is an acrylic plate. A detection hole 1101 is formed in the center of the transparent panel. The hydrogen sensor 14 and the temperature and humidity sensor 15 are mounted near the position of the detection hole 1101 by an epoxy plate.
The electrode assembly 12 includes an upper electrode 1201 and a lower electrode 1202 that are identical in structure. The upper electrode 1201 and the lower electrode 1202 are both copper electrodes. As shown in fig. 4, the upper electrode 1201 includes a plate electrode i 1201a and a rod electrode i 1201b which are integrally formed and have a T-shaped cross section; similarly, the lower electrode 1202 includes a plate electrode II and a rod electrode II integrally formed and T-shaped in cross section. The plate electrode I and the plate electrode II are positioned in the sealed cavity 11 and are opposite and parallel to each other, and iron rings (such as 1201 c) are arranged on opposite surfaces of the plate electrode I and the plate electrode II. The plate electrode I and the plate electrode II are circular plate electrodes, an iron ring is concentric with the plate electrode I/plate electrode II, the outer diameter of the iron ring is smaller than the diameters of the plate electrode I and the plate electrode II, and the inner diameter of the iron ring is equal to the outer diameter of a cable sample. The cable sample is placed between plate electrodes I and ii. The top end parts of the rod electrode I and the rod electrode II extend out of the sealing cavity from the top surface and the bottom surface of the sealing cavity respectively. And the rod electrode I and the rod electrode II are both provided with an adjusting knob (1203), the adjusting knob (1203) is positioned on the outer side of the sealed cavity, and the plate electrode I and the plate electrode II are enabled to move up and down through the adjusting knob so as to adjust the position of the cable sample in the sealed cavity.
As shown in fig. 3, the pressure regulating assembly comprises a tray 13 and a number of pressure regulating members of given weight for use therewith. The tray 13 is made of epoxy resin. The pressure regulating part is a weight made of epoxy resin. The tray is mounted on the tip end portion of the rod electrode i 1201a, and the pressure applied to the cable sample is changed by increasing or decreasing the number of pressure regulators placed on the tray.
In the embodiment, the adopted hydrogen sensor is an MQ-8 hydrogen sensor, and the hydrogen sensor is controlled and data are read through being connected with an STM32 singlechip. The operations such as sensor warm-up are performed according to a conventional manual.
The experimental device principle for electrochemical corrosion research of the water-blocking buffer layer of the high-voltage cable is provided in the embodiment, and is shown in fig. 5. The anode of the alternating voltage source 17 is connected to the rod electrode I of the upper electrode through the ammeter 18 and the first protection resistor 19 in sequence, and the cathode is grounded to the rod electrode II of the lower electrode; one end of the voltmeter 20 is connected with the rod electrode I of the upper electrode, and the other end of the voltmeter is connected with the negative electrode of the alternating-current voltage source; the ammeter and the voltmeter are respectively in communication connection with the upper computer 23; the signal input end and the signal output end of the hydrogen sensor 14 and the signal input end and the signal output end of the temperature and humidity sensor 15 are respectively connected with the corresponding signal output end or the signal input end of the STM32 singlechip 16, and are used for controlling the hydrogen sensor and the temperature and humidity sensor and reading data; the other signal output end of the STM32 singlechip 16 is connected with the upper computer 23; the direct current power supply 21 is connected in series with the second protection resistor 22 and then is connected in parallel to the power interfaces of the STM32 singlechip 16, the hydrogen sensor 14 and the temperature and humidity sensor 15, so as to supply power for the STM32 singlechip 16, the hydrogen sensor and the temperature and humidity sensor. In this embodiment, a PC is used as the host computer. In this embodiment, the cable sample is electrically tested using ac power, and the ac voltage source selects a single-phase voltage regulator to control the current and voltage in the circuit. The voltmeter and the ammeter transmit real-time data back to the upper computer in a communication mode, and the upper computer records the real-time data so as to analyze and process the follow-up data. The first protection resistor can prevent the cable sample water-blocking buffer layer from damaging the experimental device due to high current in the loop after ablation breakdown occurs. The second protection resistor can enable the direct-current power supply to meet the normal working condition requirement of the singlechip.
The practical application of the present invention will be described below by taking the study of the influence of moisture content on electrochemical corrosion of a water-blocking buffer layer of a high-voltage cable as an example. The cable sample selects water-blocking buffer layer sample pieces with different moisture contents (the water content is treated by dripping water with equal area), the actual running environment is restored by using the sandwich structure of aluminum sheet-water-blocking buffer layer-semi-conductive layer, and the aluminum sheet, the water-blocking buffer layer sample pieces and the outer semi-conductive layer all adopt wafer shapes to adapt to the plate electrode.
The method for testing the cable sample by adopting the experimental device for the electrochemical corrosion research of the high-voltage cable water-blocking buffer layer provided by the embodiment comprises the following steps: placing a cable sample between two plate electrodes of an upper electrode and a lower electrode, and placing a plurality of pressure regulating parts with given weight on a tray so as to ensure the pressure condition of the tested sample; the positions of the upper electrode and the lower electrode are adjusted through an adjusting knob, so that the cable sample is positioned at the lower half part in the sealed cavity, and then the adjusting knob is screwed to fix the cable sample; a hydrogen sensor and a temperature and humidity sensor are arranged at the upper position in the sealed cavity, and the whole cavity is sealed by sealant, so that the hydrogen sensor can measure the change of the hydrogen content in the sealed cavity; the method comprises the steps of preheating a hydrogen sensor, applying high-voltage power with given frequency and amplitude to a cable sample by utilizing an alternating-current voltage source, sending a hydrogen concentration value measured by the hydrogen sensor to an STM32 singlechip, connecting the STM32 singlechip with an upper computer, carrying out real-time communication, sending real-time data to the upper computer in a serial port mode, and calculating impedance characteristics of the sample by utilizing an ohm law while recording current and voltage data by the upper computer to obtain the impedance change condition of the cable sample.
In the experiment, the local temperature rise condition in the cable sample can be observed by using an infrared detector, so that more experimental phenomena can be known.
Those of ordinary skill in the art will recognize that the embodiments described herein are for the purpose of aiding the reader in understanding the principles of the present invention and should be understood that the scope of the invention is not limited to such specific statements and embodiments. Those of ordinary skill in the art can make various other specific modifications and combinations from the teachings of the present disclosure without departing from the spirit thereof, and such modifications and combinations remain within the scope of the present disclosure.
Claims (3)
1. An experimental device for be used for high tension cable buffer layer electrochemical corrosion research that blocks water, its characterized in that: the device comprises a sealed cavity, and an electrode assembly, a pressure regulating assembly, a hydrogen sensor and a temperature and humidity sensor which are arranged on the sealed cavity;
the electrode assembly comprises an upper electrode and a lower electrode, wherein the upper electrode comprises a plate electrode I and a rod electrode I which are integrally formed and have a T-shaped cross section, the lower electrode comprises a plate electrode II and a rod electrode II which are integrally formed and have a T-shaped cross section, the plate electrode I and the plate electrode II are positioned in a sealed cavity and are opposite in position and are arranged in parallel, iron rings are arranged on the opposite surfaces of the plate electrode I and the plate electrode II, a cable sample is placed between the two plate electrodes of the upper electrode and the lower electrode, and the top end parts of the rod electrode I and the rod electrode II extend out of the sealed cavity from the top surface and the bottom surface of the sealed cavity respectively; the rod electrode I and the rod electrode II are respectively provided with an adjusting knob for adjusting the vertical position of the cable sample in the sealing cavity, and the adjusting knobs are positioned at the outer side of the sealing cavity;
the voltage regulating assembly comprises a tray and a plurality of matched voltage regulating pieces with given weight, and the tray is arranged at the top end part of the rod electrode I;
the upper electrode and the lower electrode are respectively connected with an alternating-current voltage source, the positive electrode of the alternating-current voltage source is connected with a rod electrode I of the upper electrode through an ammeter and a first protection resistor in sequence, and the negative electrode is grounded with a rod electrode II of the lower electrode; one end of the voltmeter is connected with the rod electrode I of the upper electrode, and the other end of the voltmeter is connected with the negative electrode of the alternating current voltage source; the voltmeter and the ammeter are respectively in communication connection with the upper computer, and are used for collecting voltage signals and current signals of the cable samples; the signal input end and the signal output end of the hydrogen sensor and the signal input end and the signal output end of the temperature and humidity sensor are respectively connected with the corresponding signal output end or the signal input end of the singlechip, and are used for controlling the hydrogen sensor and the temperature and humidity sensor and reading data; the other signal output end of the singlechip is connected with the upper computer; the direct current power supply is connected in series with a second protection resistor and then connected in parallel to power interfaces of the singlechip, the hydrogen sensor and the temperature and humidity sensor, so as to supply power to the singlechip, the hydrogen sensor and the temperature and humidity sensor.
2. The experimental device for electrochemical corrosion study of a water-blocking buffer layer of a high voltage cable according to claim 1, wherein: at least one side surface of the sealing cavity is a transparent panel.
3. The experimental device for electrochemical corrosion research of a water-blocking buffer layer of a high-voltage cable according to claim 1 or 2, wherein: the plate electrode I and the plate electrode II are circular plate electrodes, the iron ring is concentric with the plate electrode I/the plate electrode II, the outer diameter of the iron ring is smaller than the diameters of the plate electrode I and the plate electrode II, and the inner diameter is equal to the outer diameter of the cable sample.
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| CN113791170B (en) * | 2021-09-07 | 2023-11-03 | 国网北京市电力公司 | Device and method for simulating ablation transfer characteristics of cable buffer layer |
| CN114299798A (en) * | 2021-11-29 | 2022-04-08 | 国网北京市电力公司 | True type cable fault simulation system |
| WO2024003333A1 (en) * | 2022-07-01 | 2024-01-04 | Hempel A/S | A system and a method for sensing a condition of a component |
| CN115078594A (en) * | 2022-07-28 | 2022-09-20 | 西安交通大学 | High-voltage cable buffer layer ablation fault diagnosis method and system based on gas detection |
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