A method and device for testing the pollution accumulation characteristics of high-voltage transmission facilities

Abstract

A device and method for testing the pollution accumulation characteristics of high-voltage transmission facilities. The device includes: a pollution accumulation characteristics test chamber (1), an environmental simulation module, a transmission simulation module, a monitoring module, and a connecting pipeline (14); the environmental simulation module is connected to the pollution accumulation characteristics test chamber (1) through the connecting pipeline (14) and is used to simulate the actual atmospheric environment; the transmission simulation module is arranged inside the pollution accumulation characteristics test chamber (1) and is used to simulate the actual operation of the transmission line; the monitoring module is connected to the pollution accumulation characteristics test chamber (1) and is used to monitor environmental parameters and electrical parameters. Parameters such as the aerosol concentration, temperature and humidity, gas flow rate, and air flow direction in the system can be adjusted; by increasing the multiple of the particle concentration of the aerosol generator to the aerosol concentration in the atmospheric environment quality, the pollution accumulation of the transmission facilities is accelerated, and the pollution accumulation characteristics of the high-voltage transmission facilities can be quickly tested.

Description

Technical Field

[0001] The present invention belongs to the technical field of high - voltage power transmission and transformation and power systems, and relates to a method and device for testing the pollution accumulation characteristics of high - voltage power transmission facilities. Background Art

[0002] DC power transmission has become an important part of the construction of China's strong intelligent power grid and UHV AC - DC power grid, and is an extremely important energy transmission artery. However, due to the static - electricity effect with a fixed polarity in DC power transmission, the pollution accumulation on the surface of pole conductors, insulators and DC equipment is more serious than that in AC power transmission. The continuous pollution accumulation on the surface of the transmission pole conductors causes an increase in the surface roughness of the pole conductors, and the corona inception field strength becomes lower and lower, so the corona discharge becomes stronger and stronger. The enhanced corona discharge increases the space charge, and the space - synthesized field strength increases. These two factors lead to an increase in the charge amount of airborne particulate matter. The electrostatic force driving the particulate matter to deposit and accumulate is proportional to the particle charge amount and the electric field strength. Therefore, the electrostatic force driving the particulate matter to electrostatically deposit increases, promoting the enhancement of pollution accumulation. The corona discharge and pollution accumulation promote each other in a vicious cycle, resulting in the continuous aggravation of corona discharge and pollution accumulation with the increase of the operation years. The continuous deterioration of corona discharge is bound to lead to an increase in corona loss. At the same time, electromagnetic environment indicators closely related to corona discharge, such as ion - current density, synthesized field strength, noise, and radio interference, deteriorate continuously.

[0003] DC pollution accumulation also brings two other aspects of harm: one is that the aggravated pollution accumulation on insulators makes the pollution flashover of DC power transmission more difficult to control, seriously threatening the safe operation of the DC power transmission system; the other is that the pollution accumulation causes partial discharge, resulting in the breakdown and damage of components such as porcelain sleeves, DC filters and bushings due to partial discharge. Measures such as increasing the length of the insulator string, repeatedly cleaning the surface dirt of equipment, and applying anti - pollution - flashover coatings increase the construction cost and operation and maintenance cost of external insulation control. Therefore, it is very necessary to evaluate the pollution accumulation characteristics of high - voltage DC power transmission facilities.

[0004] In the field of external insulation control, the detection and analysis of ash density and salt density are adopted to evaluate the pollution accumulation characteristics, providing a basis for the control of external insulation pollution flashover and partial discharge. This method reflects the actual situation of the pollution accumulation on the equipment surface, but it cannot directly evaluate the pollution accumulation amount on the equipment surface and is difficult to evaluate the pollution accumulation speed. Moreover, the natural pollution - accumulation period is long, there are too many and uncontrollable environmental change factors during the evaluation period, it is difficult to identify the inducing factors of pollution accumulation, and it is impossible to selectively evaluate the influence of operation factors. Summary of the Invention

[0005] In order to solve the deficiencies in the prior art, the purpose of the present invention is to provide a method and device for testing the pollution accumulation characteristics of high - voltage power transmission facilities, which can simulate the actual atmospheric environment, with adjustable parameters, strong experimental design, rapid assessment, and short evaluation period.

[0006] The present invention adopts the following technical solutions. A pollution accumulation characteristic test device for high-voltage transmission facilities includes: a pollution accumulation characteristic test chamber, an environment simulation module, a transmission simulation module, a monitoring module, and a connecting pipeline;

[0007] The environment simulation module is connected to the pollution accumulation characteristic test chamber through a connecting pipeline and is used to simulate the actual atmospheric environment;

[0008] The transmission simulation module is arranged inside the pollution accumulation characteristic test chamber and is used to simulate the actual operation of a transmission line;

[0009] The monitoring module is connected to the pollution accumulation characteristic test chamber and is used to monitor experimental parameters.

[0010] Preferably, the environment simulation module includes: an aerosol generator; the aerosol generator is connected to the pollution accumulation characteristic test chamber through a connecting pipeline and is used to regulate the aerosol concentration inside the pollution accumulation characteristic test chamber.

[0011] Preferably, the environment simulation module includes: a temperature and humidity controller; the temperature and humidity controller is connected to the pollution accumulation characteristic test chamber through a connecting pipeline and is used to regulate the air temperature and humidity inside the pollution accumulation characteristic test chamber.

[0012] Preferably, the environment simulation module includes: a fan; the fan is connected to the pollution accumulation characteristic test chamber through a connecting pipeline and is used to regulate the air flow inside the pollution accumulation characteristic test chamber.

[0013] Preferably, the transmission simulation module includes: a pole conductor, a grounding electrode plate, an insulating bracket, and a power supply; the pole conductor is fixed using an insulating bracket and is connected to the output terminal of the power supply through a wire.

[0014] Preferably, the pole conductor is divided into three sections, namely the shielding wire regions on both sides and the middle sampling region, and the lengths of the three regions are not less than the distance between the pole conductor and the grounding electrode plate.

[0015] Preferably, the monitoring module includes: an environmental parameter monitoring system and an electrical parameter monitoring system.

[0016] Preferably, the pollution accumulation characteristic test device for high-voltage transmission facilities further includes: a sampling test piece placed in the middle sampling region of the pole conductor and is used to test and evaluate the influencing factors of the pollution accumulation characteristics of the surface materials of ground power facilities.

[0017] Preferably, the pollution accumulation characteristic test device for high-voltage transmission facilities further includes: a sampling test piece placed on the grounding electrode plate and is used to test and evaluate the influencing factors of the pollution accumulation characteristics of the ground power facilities at the end points of the pole conductor and the middle sampling region.

[0018] The present invention also provides a method for testing the pollution accumulation characteristics of high-voltage transmission facilities using the above-mentioned testing device for the pollution accumulation characteristics of high-voltage transmission facilities, including the following steps: Step 1, place sampling test pieces according to the test items of the power facilities to be experimented;

[0019] Step 2, set environmental simulation parameters, turn on the environmental simulation module, and turn on the monitoring module until the environmental simulation parameters are reached inside the pollution accumulation characteristics test chamber;

[0020] Step 3, set transmission simulation parameters and operation time, turn on the transmission simulation module, and after reaching the operation time, enter Step 4;

[0021] Step 4, measure the pollution accumulation amount of the sampling test pieces to obtain the pollution accumulation characteristics of the transmission power facilities.

[0022] Preferably, Step 1 includes: if testing and evaluating the influencing factors of the pollution accumulation characteristics of the surface materials of ground power facilities, place the sampling test pieces in the middle sampling area of the pole conductor; if testing and evaluating the influencing factors of the pollution accumulation characteristics of the ground power facilities at the pole conductor end points and the middle sampling area, place the sampling test pieces on the grounding plate.

[0023] Preferably, Step 2 includes: according to the actual atmospheric environment to be simulated in the experiment, set the operating parameters of the aerosol generator, temperature and humidity adjuster, and fan, and use the parameter monitoring system to monitor the aerosol concentration, temperature, and humidity inside the pollution accumulation characteristics test chamber until the aerosol concentration, temperature, and humidity are stable.

[0024] Preferably, Step 2 includes: regulating the dust emission amount of the aerosol generator to be in the range of 2 to 100 times the aerosol concentration in the atmospheric environment.

[0025] Preferably, Step 3 includes: turn on the power supply to supply power to the pole conductor, measure the synthetic field strength, ion current density, and corona current generated by the discharge of the pole conductor through the electrical parameter test system, and the power supply supplies stable power for the set time.

[0026] Preferably, Step 4 includes: analyze the pollution accumulation characteristics of the high-voltage transmission facilities by calculating the pollution accumulation amount per unit area.

[0027] The beneficial effects of the present invention are that, compared with the prior art, it simulates the actual atmospheric environment, the parameters are adjustable, the experimental designability is strong, the rapid assessment is carried out, and the evaluation period is short. Specifically, it includes: putting the experimental samples of the high-voltage transmission facilities into the pollution accumulation acceleration assessment device with pole conductors and grounding plates to assess the pollution accumulation characteristics of the experimental samples and their influencing factors, and the parameters such as the aerosol concentration, temperature, humidity, gas flow rate, and gas flow direction in the pollution accumulation acceleration assessment experimental device system can be adjusted; by increasing the multiple of the particle concentration of the aerosol generator to the aerosol concentration in the atmospheric environment quality, the pollution accumulation of the transmission facilities is accelerated, and the pollution accumulation characteristics of the high-voltage DC transmission facilities are rapidly assessed. Description of the Drawings

[0028] Figure 1 It is a schematic diagram of a test device for the pollution accumulation characteristics of high - voltage transmission facilities;

[0029] Figure 2 It is a flowchart of a test method for the pollution accumulation characteristics of high - voltage transmission facilities.

[0030] In the figure:

[0031] 1 - Pollution accumulation characteristics test chamber;

[0032] 2 - Pole conductor;

[0033] 3 - Grounding electrode plate;

[0034] 4 - Insulating support;

[0035] 5 - Shielded wire area;

[0036] 6 - Intermediate sampling area;

[0037] 7 - Sampling coupon;

[0038] 8 - Aerosol generator;

[0039] 9 - Temperature and humidity controller;

[0040] 10 - Power supply;

[0041] 11 - Fan;

[0042] 12 - Environmental parameter monitoring system;

[0043] 13 - Electrical parameter monitoring system;

[0044] 14 - Connecting pipeline. Detailed Implementation Modes

[0045] The present application will be further described below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and cannot be used to limit the protection scope of the present application.

[0046] As Figure 1 shown, the present invention provides a test device for the pollution accumulation characteristics of high - voltage transmission facilities, including: a pollution accumulation characteristics test chamber 1, an environmental simulation module, a transmission simulation module, a monitoring module, and a connecting pipeline 14. The environmental simulation module is connected to the pollution accumulation characteristics test chamber 1 through the connecting pipeline 14 and is used to simulate the actual atmospheric environment; the transmission simulation module is arranged inside the pollution accumulation characteristics test chamber 1 and is used to simulate the actual operation of the transmission line; the monitoring module is connected to the pollution accumulation characteristics test chamber 1 and is used to monitor the experimental parameters.

[0047] It can be understood that those skilled in the art can arbitrarily manufacture the size specifications of the pollution accumulation characteristic test chamber 1 according to the actual operating conditions to be simulated in the experiment. A preferred but non-limiting implementation is that the size of the pollution accumulation characteristic test chamber 1 is a box with a length of 3000 mm, a width of 1500 mm, and a height of 1500 mm, which is processed from 10-mm-thick plexiglass.

[0048] The environment simulation module includes: an aerosol generator 8, a temperature and humidity controller 9, and a fan 11. The aerosol generator 8 is connected to the pollution accumulation characteristic test chamber 1 through a connecting pipeline 14 and is used to regulate the aerosol concentration inside the pollution accumulation characteristic test chamber 1. It should be noted that those skilled in the art can regulate the dust emission amount of the aerosol generator 8 to be in the range of 2 to 100 times the aerosol concentration in the atmospheric environment, so as to shorten the pollution accumulation time of the experimental sample and accelerate the assessment speed.

[0049] The temperature and humidity controller 9 is connected to the pollution accumulation characteristic test chamber 1 through a connecting pipeline 14 and is used to regulate the air temperature and humidity inside the pollution accumulation characteristic test chamber 1.

[0050] The fan 11 is connected to the pollution accumulation characteristic test chamber 1 through a connecting pipeline 14 and is used to regulate the air flow inside the pollution accumulation characteristic test chamber 1.

[0051] The connecting pipeline 14 connects the fan, the pollution accumulation characteristic test chamber 1, the aerosol generator 8, the temperature and humidity controller 9, etc., to realize gas circulation or discharge to the outdoor atmosphere, regulate the multiple of the dust emission amount of the aerosol generator 8 to the aerosol concentration in the atmospheric environment, shorten the pollution accumulation time of the experimental sample, and accelerate the assessment speed.

[0052] It should be noted that those skilled in the art can arbitrarily configure the units generating environmental factors in the environment simulation module according to the actual atmospheric environment to be simulated in the experiment. The aerosol generator 8, the temperature and humidity controller 9, and the fan 11 are only a preferred but non-limiting implementation for constructing the environment simulation module. Using more or less, or only using one or two of the aerosol generator 8, the temperature and humidity controller 9, and the fan 11, or other types of units generating environmental factors all fall within the inventive concept of the present invention and within the scope of the technical solution of the present invention.

[0053] The power transmission simulation module includes: a pole conductor 2, a grounding plate 3, an insulating support 4, and a power supply 10. The pole conductor 2 is fixed using the insulating support 4 and is connected to the output terminal of the power supply 10 through a wire.

[0054] It should be noted that those skilled in the art can arbitrarily configure the number, size specifications, etc. of the pole conductors 2, grounding plates 3, insulating brackets 4, and power supplies 10 according to the transmission line to be simulated in the experiment. A preferred but non-limiting embodiment is that the pole conductor 2 is made of an aluminum metal wire with a diameter of 2 mm and a length of 1500 mm, the grounding plate 3 is made of a stainless steel plate with a length of 2000 mm, a width of 1500 mm, and a thickness of 5 mm, and the insulating bracket 4 made of a 40 mm polyethylene rod is used to fix the pole conductor 2, and the distance between the pole conductor 2 and the grounding plate 3 is 500 mm.

[0055] It should be noted that the transmission simulation module can be either a DC transmission simulation module or an AC transmission simulation module. When testing the pollution accumulation characteristics of high-voltage DC transmission facilities, the DC transmission simulation module is selected. When testing the pollution accumulation characteristics of high-voltage AC transmission facilities, the AC transmission simulation module is selected.

[0056] The pole conductor 2 is divided into three sections, namely the shielding wire regions 5 on both sides and the middle sampling region 6, and the lengths of the three regions are not less than the distance between the pole conductor 2 and the grounding plate 3. It can be understood that those skilled in the art can arbitrarily configure the size specifications of the three sections according to the transmission line to be simulated in the experiment. A preferred but non-limiting embodiment is that if the pole conductor 2 is made of an aluminum metal wire with a diameter of 2 mm and a length of 1500 mm, and the distance between the pole conductor 2 and the grounding plate 3 is 500 mm, then the shielding wire region 5 of the pole conductor 2 is 500 mm, and the middle 500 mm region of the pole conductor 2 is the sampling region 6.

[0057] The high-voltage transmission facility pollution accumulation characteristic testing device further includes: a sampling test piece 7. When testing and evaluating the influencing factors of the pollution accumulation characteristics of the surface materials of ground power facilities, the sampling test piece 7 is placed in the middle sampling region 6 to overcome the influence of edge effects; when testing and evaluating the influencing factors of the pollution accumulation characteristics of the ground power facilities at the endpoints of the pole conductor 2 and the middle sampling region 6, the sampling test piece 7 is placed on the grounding plate 3. A preferred but non-limiting embodiment is that the sampling test piece 7 is a metal plate or ceramic plate with a thickness of 0.1 - 2 mm, or an aluminum sheet with a length of 40 mm, a width of 40 mm, and a thickness of 0.5 mm.

[0058] The monitoring module includes: an environmental parameter monitoring system 12 and an electrical parameter monitoring system 13. The environmental parameter monitoring system 1 is used for the aerosol concentration, temperature, humidity and air pressure in the pollution accumulation characteristic test chamber 1, and the electrical parameter monitoring system 13 is used for monitoring voltage, synthetic field strength, ion current, etc. It can be understood that corresponding to the configuration environment simulation module and the power transmission simulation module, those skilled in the art can configure the environmental parameter monitoring system 12 and the electrical parameter monitoring system 13 for the types of units configured in the environment simulation module and the power transmission simulation module to obtain the environmental parameters and electrical parameters inside the pollution accumulation characteristic test chamber 1.

[0059] As Figure 2 shown, the present invention also provides a method for testing the pollution accumulation characteristics of high-voltage power transmission facilities, including the following steps:

[0060] Step 1, place the sampling test piece 7 according to the test items of the power facilities to be experimented; specifically include: if testing and evaluating the influencing factors of the pollution accumulation characteristics of the surface materials of the ground power facilities, place the sampling test piece 7 in the sampling area 6 in the middle of the pole conductor 2; if testing and evaluating the influencing factors of the pollution accumulation characteristics of the ground power facilities at the endpoints and in the middle of the pole conductor 2, place the sampling test piece 7 on the grounding electrode plate 3.

[0061] Step 2, set the environmental simulation parameters, turn on the environmental simulation module, turn on the monitoring module until the environmental simulation parameters are reached in the pollution accumulation characteristic test chamber 1; specifically include: according to the actual atmospheric environment to be simulated in the experiment, set the operating parameters of the aerosol generator 8, the temperature and humidity adjuster 9 and the fan 11, and use the parameter monitoring system 12 to monitor the aerosol concentration and temperature and humidity in the pollution accumulation characteristic test chamber 1 until the aerosol concentration and temperature and humidity are stable.

[0062] Step 3, set the power transmission simulation parameters and the running time, turn on the power transmission simulation module, and after reaching the running time, enter Step 4; specifically include: turn on the power supply 10 to supply power to the pole conductor, measure the synthetic field strength, ion current density and corona current generated by the discharge of the pole conductor 2 through the electrical parameter test system 13, and the power supply 10 supplies power stably for 0.5 - 12 hours, and the length of time depends on the pollution accumulation speed, depends on the size of the aerosol concentration, and depends on the accuracy and resolution of the weighing instrument. It is expressed by the following formula (1),

[0063]

[0064] In the formula:

[0065] t is the pollution accumulation sampling time (s);

[0066] m is the minimum scale of the weighing instrument (g);

[0067] V is the aerosol deposition speed (m / s);

[0068] S is the area of the sampling piece (m 2 );

[0069] C is the aerosol concentration (g / m 3 ).

[0070] Step 4: Measure the pollution accumulation amount of the sampling test piece to obtain the pollution accumulation characteristics of the transmission power facilities; specifically, it includes analyzing the pollution accumulation characteristics of the high-voltage transmission facilities by calculating the pollution accumulation amount per unit area.

[0071] The beneficial effects of the present invention are as follows. Compared with the prior art, the present invention provides a method and device for testing the pollution accumulation characteristics of high-voltage transmission facilities, that is, putting the experimental samples of high-voltage DC or AC transmission facilities into the pollution accumulation acceleration test device with a polar wire and a grounding electrode plate to evaluate the pollution accumulation characteristics of the experimental samples and their influencing factors, and the parameters such as aerosol concentration, temperature and humidity, gas flow rate and gas flow direction in the pollution accumulation acceleration test device system can be adjusted. And it can accelerate the pollution accumulation of transmission facilities by increasing the multiple of the particle concentration of the aerosol generator to the aerosol concentration in the atmospheric environment quality, so as to quickly evaluate the pollution accumulation characteristics of high-voltage transmission facilities.

[0072] The applicant of the present invention has made a detailed description and illustration of the embodiments of the present invention in combination with the accompanying drawings of the specification. However, those skilled in the art should understand that the above embodiments are only the preferred implementation schemes of the present invention, and the detailed description is only to help readers better understand the spirit of the present invention, rather than a limitation on the protection scope of the present invention. On the contrary, any improvement or modification based on the spirit of the present invention should fall within the protection scope of the present invention.

Claims

1. A device for testing the pollution accumulation characteristics of high-voltage power transmission facilities, comprising: Pollution accumulation characteristic test experimental box (1), environment simulation module, power transmission simulation module, monitoring module and connecting pipeline (14); characterized in that, The environment simulation module is connected to the pollution accumulation characteristic test experimental box (1) through the connecting pipeline (14) and is used to simulate the actual atmospheric environment; the environment simulation module includes: an aerosol generator (8); the aerosol generator (8) is connected to the pollution accumulation characteristic test experimental box (1) through the connecting pipeline (14) and is used to regulate the aerosol concentration inside the pollution accumulation characteristic test experimental box (1); The power transmission simulation module is arranged inside the pollution accumulation characteristic test experimental box (1) and is used to simulate the actual operation of the power transmission line; the power transmission simulation module includes: a pole conductor (2), a grounding electrode plate (3), an insulating support (4) and a power supply (10); the pole conductor (2) is fixed by the insulating support (4) and is connected to the output end of the power supply (10) through a wire; The monitoring module is connected to the pollution accumulation characteristic test experimental box (1) and is used to monitor experimental parameters.

2. The high-voltage power transmission facility pollution accumulation characteristic test device according to claim 1, characterized in that: The environment simulation module includes: a temperature and humidity controller (9); the temperature and humidity controller (9) is connected to the pollution accumulation characteristic test experimental box (1) through the connecting pipeline (14) and is used to regulate the air temperature and humidity inside the pollution accumulation characteristic test experimental box (1).

3. The high-voltage power transmission facility pollution accumulation characteristic test device according to claim 1, characterized in that: The environment simulation module includes: a fan (11); the fan (11) is connected to the pollution accumulation characteristic test experimental box (1) through the connecting pipeline (14) and is used to regulate the air flow inside the pollution accumulation characteristic test experimental box (1).

4. The high-voltage power transmission facility pollution accumulation characteristic test device according to claim 1, characterized in that: The pole conductor (2) is divided into three sections, namely the shielding wire areas (5) on both sides and the middle sampling area (6) in the middle, and the lengths of the three areas are not less than the distance between the pole conductor (2) and the grounding electrode plate (3).

5. The high-voltage power transmission facility pollution accumulation characteristic test device according to any one of claims 1 to 4, characterized in that: The monitoring module includes: an environmental parameter monitoring system (12) and an electrical parameter monitoring system (13).

6. The high-voltage power transmission facility pollution accumulation characteristic test device according to any one of claims 1 to 4, characterized in that: The high-voltage power transmission facility pollution accumulation characteristic test device further includes: a sampling test piece (7) placed in the middle sampling area (6) of the pole conductor (2) and is used to test and evaluate the influencing factors of the pollution accumulation characteristics of the surface materials of ground power facilities.

7. The high-voltage power transmission facility pollution accumulation characteristic test device according to any one of claims 1 to 4, characterized in that: The high-voltage power transmission facility pollution accumulation characteristic test device further includes: a sampling test piece (7) placed on the grounding electrode plate (3) and is used to test and evaluate the influencing factors of the pollution accumulation characteristics of the ground power facilities at the end points of the pole conductor (2) and the middle sampling area (6).

8. A method for testing the pollution accumulation characteristics of high-voltage transmission facilities using the high-voltage transmission facility pollution accumulation characteristic testing device according to any one of claims 1 to 7, characterized in that, Including the following steps: Step 1, place the sampling test piece (7) according to the test items of the power facility to be experimented. Step 2, set the environmental simulation parameters, turn on the environmental simulation module and the monitoring module until the environmental simulation parameters are reached inside the pollution accumulation characteristic test chamber (1). Step 3, set the transmission simulation parameters and the operation time, turn on the transmission simulation module, and after reaching the operation time, proceed to Step 4. Step 4, measure the pollution accumulation amount of the sampling coupon (7) to obtain the pollution accumulation characteristics of the transmission power facilities.

9. The method for testing the pollution accumulation characteristics of high-voltage transmission facilities according to claim 8, wherein: Step 1 includes: if testing and evaluating the influencing factors of the pollution accumulation characteristics of the surface material of the ground power facilities, place the sampling coupon (7) in the middle sampling area (6) of the overhead conductor (2); if testing and evaluating the influencing factors of the pollution accumulation characteristics of the ground power facilities at the end points and the middle sampling area (6) of the overhead conductor (2), place the sampling coupon (7) on the grounding plate (3).

10. The method for testing the pollution accumulation characteristics of high-voltage transmission facilities according to claim 8, wherein: Step 2 includes: according to the actual atmospheric environment to be simulated in the experiment, set the operating parameters of the aerosol generator (8), the temperature and humidity adjuster (9) and the fan (11), and use the parameter monitoring system (12) to monitor the aerosol concentration and temperature and humidity inside the pollution accumulation characteristic test chamber (1) until the aerosol concentration, temperature and humidity are stable.

11. The method for testing the pollution accumulation characteristics of high-voltage transmission facilities according to claim 10, wherein: Step 2 includes: adjusting the dust emission amount of the aerosol generator (8) to be in the range of 2 to 100 times the aerosol concentration of the atmospheric environment.

12. The method for testing the pollution accumulation characteristics of high-voltage transmission facilities according to claim 8, wherein: Step 3 includes: turn on the power supply (10) to supply power to the overhead conductor (2), measure the synthetic field strength, ion current density and corona current generated by the discharge of the overhead conductor (2) through the electrical parameter monitoring system (13), and the power supply (10) supplies power stably for a set time.

13. The method for testing the pollution accumulation characteristics of high-voltage transmission facilities according to claim 12, wherein: Step 4 includes: analyzing the pollution accumulation characteristics of the high-voltage transmission facilities by calculating the pollution accumulation amount per unit area.

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