CN113933664A - Artificial pollution test method for composite cross arm structure - Google Patents
Artificial pollution test method for composite cross arm structure Download PDFInfo
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- CN113933664A CN113933664A CN202111181462.4A CN202111181462A CN113933664A CN 113933664 A CN113933664 A CN 113933664A CN 202111181462 A CN202111181462 A CN 202111181462A CN 113933664 A CN113933664 A CN 113933664A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1245—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of line insulators or spacers, e.g. ceramic overhead line cap insulators; of insulators in HV bushings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/003—Environmental or reliability tests
Abstract
According to the artificial pollution test method for the composite cross arm structure, the mixed powder which is easily and uniformly distributed on the outer surface of the composite cross arm structure and is easily cleaned is electrostatically sprayed on the outer surface of the composite cross arm structure, the hydrophobicity of the composite cross arm structure is temporarily reduced, the pollution is coated on the composite cross arm structure, the difficulty of the pollution coating is lower, the working strength of experimenters can be effectively reduced, and the working efficiency is high; the mixed powder is formed by mixing kaolin, straw powder and plant ash according to a ratio, the raw materials are wide in source, easy to obtain and strong in practicability, and the mixed powder obtained by mixing is extremely easy to uniformly distribute on the outer surface of the composite cross arm structure under the action of jet force and electrostatic force and is extremely easy to clean, more convenient to use and strong in operability; the smeared composite cross arm can be directly used for a pressurization experiment.
Description
Technical Field
The invention relates to the technical field of artificial pollution tests, in particular to an artificial pollution test method for a composite cross arm structure.
Background
In the field of electric power facilities, a composite insulating cross arm for a transmission line is an important matched structural member, one end of the composite insulating cross arm is connected with a transmission tower through fixing equipment such as hardware fittings, and the other end of the composite insulating cross arm is connected with a transmission lead. The silicon rubber umbrella skirt on the insulating cross arm has the functions of increasing the creepage distance and improving the insulating level of the composite cross arm. The cross arm comprises an early fuse wire cross arm, a solid core rod composite insulating cross arm and a hollow filling type composite insulating cross arm. The early fuse wire insulation cross arm is made of wood or iron, but the problems of insulation level reduction, wide power transmission corridor, large influence of wind swing and the like can occur in the long-term operation process. The hollow filling type composite insulating cross arm mainly comprises a hollow core tube, a filling material and an umbrella skirt, is small in mass and convenient to transport, has the difficult problems of neck clamping such as the filling material is not too close, and cannot meet the requirement of the inner insulating sealing performance of the hollow filling type composite insulating cross arm when being used outdoors. At present, solid core rods are mostly adopted in composite insulating cross arms with larger market share. The solid core rod is prepared from glass fiber and matrix resin through a pultrusion process. The composite cross arm of the glass fiber core rod is limited by the defects of mechanical properties, high temperature resistance and corrosion resistance of glass fibers, and the glass fiber core rod composite cross arm is easy to cause the occurrence of grounding short circuit faults due to the fact that the end part of the glass fiber core rod composite cross arm is often subjected to overlarge displacement when bearing load, and is short in service life in a damp and hot environment or an acidic environment.
For the artificial pollution test of the composite cross arm structure, due to the structural complexity, the complete pollution test of the composite cross arm structure is relatively complex, the workload such as pollution coating is involved, and because the insulator on the composite cross arm structure has stronger hydrophobicity, the composite cross arm structure also has certain hydrophobicity, and the pollution coating difficulty is higher. In the manual pollution test of the composite cross arm structure, a layer of pollution is coated on the surface of an insulator by a manual method, the insulator is wetted in steam fog, voltage is applied to the insulator to enable the insulator to flashover, and the flashover formed by the deposition of the pollution in the running condition of the insulator in the power transmission line which actually runs is simulated, so that a larger test data volume can be obtained in a short time.
Aiming at the problems that the composite cross arm is complex in structure, and the composite cross arm structure also has strong hydrophobicity and higher smearing difficulty, the invention reasonably designs a manual pollution test method to reduce the working strength of experimenters.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide the artificial pollution test method of the composite cross arm structure, which has the advantages of simple experimental method, low operation difficulty and high working efficiency.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: an artificial pollution test method for a composite cross arm structure comprises the following steps:
step S1, cleaning: washing the composite cross arm with tap water, and drying to obtain a cleaned composite cross arm;
step S2, electrostatic spraying:
s21, adding 5-7 wt% of rice straw powder and 6-9 wt% of plant ash into kaolin, and uniformly mixing to obtain mixed powder;
s22, spraying the mixed powder prepared in the step S21 by using an electrostatic powder spray gun, and adsorbing the mixed powder with negative charges onto the cleaned composite cross arm under the action of spraying force and electrostatic force to obtain an electrostatic spraying composite cross arm;
step S3, adsorption: removing mixed powder on the electrostatically sprayed composite cross arm by using a dust collector to obtain a composite cross arm to be used;
step S4, smearing: coating dirt on the composite cross arm to be used by adopting a quantitative brushing method to obtain a stained composite cross arm;
step S5, wetting and pressurizing experiment: and putting the smeared composite cross arm into steam fog for wetting, and applying voltage to perform a pressurization experiment.
Further, in the step S1, the composite cross arm is washed clean with running tap water, and dried under the conditions of ventilation drying and the temperature of 35 to 40 ℃, so as to obtain the cleaned composite cross arm.
Further, in the step S21, 6 to 7 weight percent of rice straw powder and 7 to 9 weight percent of plant ash are added to kaolin, and the mixture is uniformly mixed to obtain mixed powder.
Further, the particle size of the mixed powder in step S21 is 15 to 35 mm.
Further, the particle diameter of the mixed powder in the step S21 is 25 to 35 mm.
Further, in the step S22, the electrostatic powder spray gun sprays the mixed powder prepared in the step S21 at a temperature of 15 to 20 ℃, and the negatively charged mixed powder is adsorbed to the cleaned composite cross arm under the action of the spraying force and the electrostatic force, so as to obtain the electrostatically sprayed composite cross arm.
Further, in the step S4, dirt is coated on the composite cross arm to be used by a quantitative brushing method, so as to obtain a smeared composite cross arm; specifically, NaCl was used to simulate soluble substances in the contaminated material, and diatomaceous earth was used to simulate insoluble substances in the contaminated material.
In step S4, soluble substances in the contaminated material are simulated by chemically pure NaCl, and insoluble substances in the contaminated material are simulated by chemically pure diatomaceous earth.
Further, in the step S5, the smeared composite cross arm is placed in steam fog to be moistened, a voltage is applied at the same time, and a constant voltage lifting method is used for testing, wherein the voltage level difference in the constant voltage lifting method is 5%, the testing time is 1h, and the effective testing times are 10-12 times.
Further, in the step S5, the smeared composite cross arm is placed in steam fog to be affected with damp, voltage is applied at the same time, and a uniform boost method is used for testing, wherein the steam fog in the uniform boost method is wetted for 20min, the pressure is applied to flashover every 5min, the boost speed is 2.7kV/S, and the flashover frequency is 5-7 times.
The invention has the beneficial effects that: according to the artificial pollution test method for the composite cross arm structure, the characteristic that the hydrophobicity of the composite cross arm structure is strong and weak in time due to the influence of the hydrophobicity of the insulator on the same composite cross arm structure along with the difference of the running time is utilized, the outer surface of the composite cross arm structure is electrostatically sprayed with the mixed powder which is easily and uniformly distributed to the outer surface of the composite cross arm structure and is easily cleaned, the hydrophobicity of the composite cross arm structure is temporarily reduced, then the composite cross arm structure is coated with the pollution, the pollution difficulty is lower, the working intensity of experimenters can be effectively reduced, and the working efficiency is high; the mixed powder is formed by mixing kaolin, straw powder and plant ash according to a ratio, the raw materials are wide in source, easy to obtain and strong in practicability, and the mixed powder obtained by mixing is extremely easy to uniformly distribute to the outer surface of the composite cross arm structure under the action of the injection force and the electrostatic force and is extremely easy to clean, the use is more convenient, and the operability is high.
Drawings
Fig. 1 is a partially enlarged view of a flashover process in embodiment 1 of the artificial pollution test method for a composite cross arm structure according to the present invention.
Detailed Description
The following examples may help one skilled in the art to more fully understand the present invention, but are not intended to limit the invention in any way.
The invention relates to an artificial pollution test method of a composite cross arm structure, which adopts a T-shaped cross arm of 35X 73X 1860 as a test object. According to the GBT-775.2-2003 insulator test method, part two: the electric test method covers the range of different pollution degrees as far as possible in the area under the same pollution condition. For different pollution areas, the test pollution degrees are selected to have different pollution levels, from the pollution levels of b-light pollution, c-medium pollution and the like, the pollution degrees of d-heavy pollution areas are respectively selected to be (0.05)/0.25 mg/cm), (0.1/0.5 mg/cm), (0.15/0.75 mg/cm) and (0.2/1.0 mg/cm) (NaCl/diatomite/cm) for testing of 4 pollution degrees. The staining method adopts a quantitative brushing method and adopts clean steam mist to wet a stain layer. The drying time is selected to be 20-25 h. Meanwhile, the drying time is 5 days when strong hydrophobicity is tested. For the different pressurization methods, according to the literature, the voltage obtained by using the up-down method is lower than the pollution flashover voltage obtained by the boost method, and therefore, testing mainly by using the up-down method will yield reliable test data. Different smearing methods include a dirt soaking method, a spraying method, a quantitative brushing method and the like, the dirt soaking method obtains lower test voltage than the quantitative brushing method, and the quantitative brushing method is easier to operate, so the quantitative brushing method is selected in the test.
Artificial pollution test parameters
| Test conditions | Parameter(s) |
| Test method | Constant pressure method |
| Artificial fog | Steam fog |
| Smearing mode | Quantitative brushing method |
| Drying time | 20-25h |
| Soluble salt | Chemical purity of NaCl |
| Inert waste | Chemical pure diatomite |
| Altitude (H) level | 13.4-29.5 m |
The invention relates to an artificial pollution test method of a composite cross arm structure, wherein the pressurizing modes of a pressurizing test in the artificial pollution test mainly comprise a constant-pressure lifting method and a uniform pressure boosting method, and the 2 methods have advantages and disadvantages respectively. The constant voltage lifting method is more consistent with the actual operation working condition of the polluted insulator, is a method recommended by national standards, has small data dispersion, but has long test period. The test time of the uniform boosting method is short, but the method has larger difference with the actual working condition and large data dispersity, and is not taken as a standard recommended method. The test mainly adopts a constant voltage lifting method and a uniform voltage boosting method to quickly search for an initial voltage value. In the constant voltage rising and falling method, the voltage level difference is 5%, the test time is 1h, and the effective test times are 10-12. The uniform voltage boosting method is that steam fog is wetted for 20min, pressure is applied to flashover every 5min, the voltage boosting speed is 2.7kV/s, the flashover frequency is 5-7 times, and the average value and the relative standard deviation of flashover voltage are calculated.
The invention relates to an artificial pollution test method for a composite cross arm structure, which is characterized in that the arc characteristic of a composite cross arm in a pollution flashover process is shot, and an ultraviolet camera is erected at a position close to an artificial pollution test power supply on the ground of an experiment site to ensure the whole process from arc occurrence to flashover of the composite cross arm after shooting. For convenience of shooting, the arc development process is shot by using a uniform boost method. The boosting speed is 2.7kV/s, the boosting time is 2-3 min, the recording time of the high-speed camera is 10s, and the shooting is started immediately before the flashover.
Example 1
An artificial pollution test method for a composite cross arm structure comprises the following steps:
step S1, cleaning: washing the composite cross arm with flowing tap water, and drying under the conditions of ventilation drying and 35 ℃ to obtain a cleaned composite cross arm;
step S2, electrostatic spraying:
s21, adding 5 wt% of rice straw powder and 6 wt% of plant ash into kaolin, and uniformly mixing to obtain mixed powder; the grain diameter of the mixed powder is 15 mm;
s22, under the condition that the temperature is 15 ℃, the electrostatic powder spray gun sprays the mixed powder prepared in the step S21, and the mixed powder with negative charges is adsorbed to the cleaned composite cross arm under the action of the spraying force and the electrostatic force to obtain the electrostatically sprayed composite cross arm;
step S3, adsorption: removing mixed powder on the electrostatically sprayed composite cross arm by using a dust collector to obtain a composite cross arm to be used;
step S4, smearing: coating dirt on the composite cross arm to be used by adopting a quantitative brushing method to obtain a stained composite cross arm; specifically, NaCl is used for simulating soluble substances in the sewage, and diatomite is used for simulating insoluble substances in the sewage;
step S5, wetting and pressurizing experiment: and putting the smeared composite cross arm into steam fog for wetting, and applying voltage to perform a pressurization experiment.
In step S2, 38 g of the consumed mixed powder is electrostatically sprayed, wherein 5.83 g of the mixed powder is dispersed in the air, and the remaining 32.17 g of the mixed powder is uniformly coated on the composite cross arm; 32.12 g of the mixed powder adsorbed in step S3, and it can be seen that the mixed powder on the composite cross arm can be cleaned in step S3 in consideration of natural loss; the experimenter also performed comparative experiments, and the experimental contents were: whether the mixed powder is electrostatically sprayed before smearing or not. The experimental result shows that the outer surface of the composite cross arm structure is smeared after being electrostatically sprayed with the mixed powder, so that the smearing difficulty is lower, and the working strength of experimenters can be effectively reduced; referring to the partial enlarged view of the flashover process of the pressurization experiment when the pollution degree of the composite cross arm is 0.05/0.25mg/cm, as the voltage rises, more sporadic point-like discharge appears in the lower half part of the middle of the composite cross arm, the partial amplification of the spartic point-like discharge gradually changes from the point-like discharge in the middle of the composite cross arm to arc discharge, the partial arc discharge is tightly attached to the surface of the composite insulator and mainly located at the lower part of the composite cross arm, and the high-voltage end forms obvious arc discharge.
Example 2
An artificial pollution test method for a composite cross arm structure comprises the following steps:
step S1, cleaning: washing the composite cross arm with flowing tap water, and drying under the conditions of ventilation drying and 40 ℃ to obtain a cleaned composite cross arm;
step S2, electrostatic spraying:
s21, adding 7 wt% of rice straw powder and 9 wt% of plant ash into kaolin, and uniformly mixing to obtain mixed powder; the particle size of the mixed powder is 35 mm;
s22, under the condition that the temperature is 20 ℃, the electrostatic powder spray gun sprays the mixed powder prepared in the step S21, and the mixed powder with negative charges is adsorbed to the cleaned composite cross arm under the action of the spraying force and the electrostatic force to obtain the electrostatically sprayed composite cross arm;
step S3, adsorption: removing mixed powder on the electrostatically sprayed composite cross arm by using a dust collector to obtain a composite cross arm to be used;
step S4, smearing: coating dirt on the composite cross arm to be used by adopting a quantitative brushing method to obtain a stained composite cross arm; specifically, NaCl is used for simulating soluble substances in the sewage, and diatomite is used for simulating insoluble substances in the sewage;
step S5, wetting and pressurizing experiment: and putting the smeared composite cross arm into steam fog for wetting, and applying voltage to perform a pressurization experiment.
In step S2, 39.1 g of the consumed mixed powder was electrostatically sprayed, wherein 6.77 g of the mixed powder dispersed in the air and the remaining 32.33 g of the mixed powder were uniformly coated on the composite cross arm; 32.28 g of the mixed powder adsorbed in step S3, and considering natural loss, it can be seen that the mixed powder on the composite cross arm can be cleaned in step S3; the experimenter also performed comparative experiments, and the experimental contents were: whether the mixed powder is electrostatically sprayed before smearing or not. The experimental result shows that the outer surface of the composite cross arm structure is smeared after being electrostatically sprayed with the mixed powder, so that the smearing difficulty is lower, and the working strength of experimenters can be effectively reduced; referring to the partial enlarged view of the flashover process of the pressurization experiment when the pollution degree of the composite cross arm is 0.05/0.25mg/cm, as the voltage rises, more sporadic point-like discharge appears in the lower half part of the middle of the composite cross arm, the partial amplification of the spartic point-like discharge gradually changes from the point-like discharge in the middle of the composite cross arm to arc discharge, the partial arc discharge is tightly attached to the surface of the composite insulator and mainly located at the lower part of the composite cross arm, and the high-voltage end forms obvious arc discharge.
Example 3
An artificial pollution test method for a composite cross arm structure comprises the following steps:
step S1, cleaning: washing the composite cross arm with flowing tap water, and drying under the conditions of ventilation drying and 38 ℃ to obtain a cleaned composite cross arm;
step S2, electrostatic spraying:
s21, adding 6 wt% of rice straw powder and 7 wt% of plant ash into kaolin, and uniformly mixing to obtain mixed powder; the grain diameter of the mixed powder is 25 mm;
s22, under the condition that the temperature is 17 ℃, the electrostatic powder spray gun sprays the mixed powder prepared in the step S21, and the mixed powder with negative charges is adsorbed to the cleaned composite cross arm under the action of the spraying force and the electrostatic force to obtain the electrostatically sprayed composite cross arm;
step S3, adsorption: removing mixed powder on the electrostatically sprayed composite cross arm by using a dust collector to obtain a composite cross arm to be used;
step S4, smearing: coating dirt on the composite cross arm to be used by adopting a quantitative brushing method to obtain a stained composite cross arm; specifically, NaCl is used for simulating soluble substances in the sewage, and diatomite is used for simulating insoluble substances in the sewage;
step S5, wetting and pressurizing experiment: and putting the smeared composite cross arm into steam fog for wetting, and applying voltage to perform a pressurization experiment.
In step S2, 38.5 g of the consumed mixed powder was electrostatically sprayed, wherein 6.02 g of the mixed powder was dispersed in the air, and the remaining 32.48 g of the mixed powder was uniformly coated on the composite cross arm; 32.29 g of the mixed powder adsorbed in step S3, and considering natural loss, it can be seen that the mixed powder on the composite cross arm can be cleaned in step S3; the experimenter also performed comparative experiments, and the experimental contents were: whether the mixed powder is electrostatically sprayed before smearing or not. The experimental result shows that the outer surface of the composite cross arm structure is smeared after being electrostatically sprayed with the mixed powder, so that the smearing difficulty is lower, and the working strength of experimenters can be effectively reduced; referring to the partial enlarged view of the flashover process of the pressurization experiment when the pollution degree of the composite cross arm is 0.05/0.25mg/cm, as the voltage rises, more sporadic point-like discharge appears in the lower half part of the middle of the composite cross arm, the partial amplification of the spartic point-like discharge gradually changes from the point-like discharge in the middle of the composite cross arm to arc discharge, the partial arc discharge is tightly attached to the surface of the composite insulator and mainly located at the lower part of the composite cross arm, and the high-voltage end forms obvious arc discharge.
Comparative example 1
An artificial pollution test method for a composite cross arm structure comprises the following steps:
step S1, cleaning: washing the composite cross arm with flowing tap water, and drying under the conditions of ventilation drying and 35-40 ℃ to obtain a cleaned composite cross arm;
step S2, smearing: coating dirt on the cleaned composite cross arm by adopting a quantitative coating method to obtain a coated composite cross arm; specifically, NaCl is used for simulating soluble substances in the sewage, and diatomite is used for simulating insoluble substances in the sewage;
step S5, wetting and pressurizing experiment: and putting the smeared composite cross arm into steam fog for wetting, and applying voltage to perform a pressurization experiment.
Referring to the partial enlarged view of the flashover process of the pressurization experiment when the pollution degree of the composite cross arm is 0.05/0.25mg/cm, as the voltage rises, more sporadic point-like discharge appears in the lower half part of the middle of the composite cross arm, the partial amplification of the spartic point-like discharge gradually changes from the point-like discharge in the middle of the composite cross arm to arc discharge, the partial arc discharge is tightly attached to the surface of the composite insulator and mainly located at the lower part of the composite cross arm, and the high-voltage end forms obvious arc discharge.
From the experimental results of the examples 1 to 3 and the comparative example 1, it can be seen that the change conditions of the flashover voltage values of the examples 1 to 3 and the comparative example 1 are highly consistent, so that whether the mixed powder is electrostatically sprayed before smearing does not affect the experimental result of the pressurization experiment, and the experimental results of the examples 1 to 3 and the comparative example 1 are highly consistent, so that the experimental method of the present invention has high reproducibility and strong operability; compared with the existing determination method, the method utilizes the characteristic that the hydrophobicity of the same composite cross arm structure is strong and weak in time due to the influence of the hydrophobicity of the insulator on the same composite cross arm structure along with the operation time, and the outer surface of the composite cross arm structure is electrostatically sprayed with the mixed powder which is easily and uniformly distributed to the outer surface of the composite cross arm structure and is easily cleaned, so that the hydrophobicity of the composite cross arm structure is temporarily reduced, the composite cross arm structure is coated with dirt, the dirt coating difficulty is lower, the working strength of experimenters can be effectively reduced, and the working efficiency is high; the mixed powder is formed by mixing kaolin, straw powder and plant ash according to a ratio, the raw materials are wide in source, easy to obtain and strong in practicability, and the mixed powder obtained by mixing is extremely easy to uniformly distribute to the outer surface of the composite cross arm structure under the action of the injection force and the electrostatic force and is extremely easy to clean, the use is more convenient, and the operability is high.
Although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. An artificial pollution test method for a composite cross arm structure is characterized by comprising the following steps:
step S1, cleaning: washing the composite cross arm with tap water, and drying to obtain a cleaned composite cross arm;
step S2, electrostatic spraying:
s21, adding 5-7 wt% of rice straw powder and 6-9 wt% of plant ash into kaolin, and uniformly mixing to obtain mixed powder;
s22, spraying the mixed powder prepared in the step S21 by using an electrostatic powder spray gun, and adsorbing the mixed powder with negative charges onto the cleaned composite cross arm under the action of spraying force and electrostatic force to obtain an electrostatic spraying composite cross arm;
step S3, adsorption: removing mixed powder on the electrostatically sprayed composite cross arm by using a dust collector to obtain a composite cross arm to be used;
step S4, smearing: coating dirt on the composite cross arm to be used by adopting a quantitative brushing method to obtain a stained composite cross arm;
step S5, wetting and pressurizing experiment: and putting the smeared composite cross arm into steam fog for wetting, and applying voltage to perform a pressurization experiment.
2. The artificial pollution test method of the composite cross arm structure according to claim 1, wherein the composite cross arm is cleaned by flowing tap water in the step S1, and the cleaned composite cross arm is obtained by drying the composite cross arm under the conditions of ventilation drying and the temperature of 35-40 ℃.
3. The artificial pollution test method of the composite cross arm structure according to claim 1, wherein in the step S21, 6-7 wt% of straw powder and 7-9 wt% of plant ash are added into kaolin, and the mixture is uniformly mixed to obtain mixed powder.
4. The artificial pollution test method of the composite cross arm structure according to claim 1, wherein the grain size of the mixed powder in the step S21 is 15-35 mm.
5. The artificial pollution test method of the composite cross arm structure according to claim 4, wherein the grain size of the mixed powder in the step S21 is 25-35 mm.
6. The artificial pollution test method of a composite cross arm structure according to claim 1, wherein in the step S22, under the condition that the temperature is 15-20 ℃, the electrostatic powder spray gun sprays the mixed powder prepared in the step S21, and the mixed powder with negative charges is adsorbed to the cleaned composite cross arm under the action of the spraying force and the electrostatic force, so as to obtain the electrostatically sprayed composite cross arm.
7. The artificial pollution test method of the composite cross arm structure according to claim 1, wherein in the step S4, a quantitative painting method is adopted to paint pollutants on the composite cross arm to be used, so as to obtain a painted composite cross arm; specifically, NaCl was used to simulate soluble substances in the contaminated material, and diatomaceous earth was used to simulate insoluble substances in the contaminated material.
8. The composite cross arm structure artificial pollution test method according to claim 7, wherein soluble substances in the pollution are simulated by chemical pure NaCl and insoluble substances in the pollution are simulated by chemical pure diatomite in the step S4.
9. The artificial pollution test method of the composite cross arm structure according to claim 1, wherein in the step S5, the smeared composite cross arm is placed in steam fog to be affected with damp, and is applied with voltage, and is tested by using a constant voltage lifting method, wherein the voltage level difference in the constant voltage lifting method is 5%, the test time is 1h, and the effective test times are 10-12 times.
10. The artificial pollution test method of the composite cross arm structure according to claim 1, wherein the step S5 is to place the smeared composite cross arm in steam fog to be wetted, and apply voltage simultaneously, and perform the test by using a uniform boost method, wherein the steam fog is wetted for 20min, pressurized to flashover every 5min, the boosting speed is 2.7kV/S, and the flashover frequency is 5-7 times.
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