CN113188988A - Artificial simulation system and simulation method for silicon rubber aging process in acidic corrosive environment - Google Patents
Artificial simulation system and simulation method for silicon rubber aging process in acidic corrosive environment Download PDFInfo
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- 229920002379 silicone rubber Polymers 0.000 title claims abstract description 87
- 230000002378 acidificating effect Effects 0.000 title claims abstract description 59
- 230000032683 aging Effects 0.000 title claims abstract description 36
- 238000004088 simulation Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000002131 composite material Substances 0.000 claims abstract description 86
- 239000002253 acid Substances 0.000 claims abstract description 74
- 239000000463 material Substances 0.000 claims abstract description 47
- 239000007788 liquid Substances 0.000 claims abstract description 42
- 238000005260 corrosion Methods 0.000 claims abstract description 35
- 230000007797 corrosion Effects 0.000 claims abstract description 35
- 239000004945 silicone rubber Substances 0.000 claims abstract description 32
- 239000012212 insulator Substances 0.000 claims abstract description 31
- 230000005684 electric field Effects 0.000 claims abstract description 14
- 238000002360 preparation method Methods 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 35
- 239000008367 deionised water Substances 0.000 claims description 20
- 229910021641 deionized water Inorganic materials 0.000 claims description 20
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 15
- 229910017604 nitric acid Inorganic materials 0.000 claims description 15
- 239000011521 glass Substances 0.000 claims description 13
- 239000000126 substance Substances 0.000 claims description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 claims description 3
- 239000007795 chemical reaction product Substances 0.000 claims description 3
- 238000002372 labelling Methods 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 3
- 239000003595 mist Substances 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 238000011160 research Methods 0.000 abstract description 11
- 230000007246 mechanism Effects 0.000 abstract description 7
- 238000005530 etching Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 238000003916 acid precipitation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000009194 climbing Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004643 material aging Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
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Abstract
The invention discloses an artificial simulation system and a simulation method for a silicone rubber aging process in an acidic corrosive environment, which comprises the following steps: the voltage generator applies different voltages to the composite silicon rubber material sample to simulate the voltage gradient of the insulator of the operating line; the ultrasonic generator is used for emitting ultrasonic waves to acid solutions with different pH values to atomize the acid solutions and simulate the acid corrosion environment of an operating line; an acid-proof test chamber for placing a composite silicon rubber material sample; the acidic corrosive liquid preparation device is used for preparing acidic corrosive liquids with different pH values; the composite silicon rubber material sample is used for simulating an aging process under an acidic corrosion environment; acid-resistant electrodes, which are used for applying uniform electric fields at two ends of the composite silicon rubber material sample to simulate electric fields at two ends of an insulator string of an operating line; the technical problems that in the prior art, researches on corrosion mechanisms of an acid environment are not clear, but a composite insulator is difficult to obtain a sample in a single acid corrosion environment, so that research work is greatly hindered and the like are solved.
Description
Technical Field
The invention belongs to the technical field of rubber material aging, and particularly relates to an artificial simulation system and a simulation method for a silicone rubber aging process in an acidic corrosive environment.
Technical Field
In recent years, composite insulators, RTV climbing skirts, composite insulating sleeves and the like have been widely used in ac/dc power transmission networks due to their excellent electrical and mechanical properties. The aging problem of the composite insulating material in the application process is a serious challenge to the safe operation of a power grid, and particularly, the aging problem is more prominent under severe environments such as high corrosion, strong ultraviolet and the like. With the increasing environmental pollution, the composite insulator on the power transmission line is corroded by acid rain pollution and increasingly serious acidic chemical substance pollution in industrial cities for a long time, and under the influence of the factors, the overall performance of the umbrella skirt on the surface of the composite insulator is reduced to a certain extent, so that the safe and reliable operation of a power grid is seriously threatened, and therefore, the corrosion mechanism of the composite insulating material in the acidic corrosion environment needs to be researched.
The study on corrosion of composite silicon rubber materials by scholars at home and abroad is still in the initial stage, the study on corrosion mechanism of an acid environment and the like is not clear, but the acquisition of a sample of the composite insulator in a single acid corrosion environment is difficult, and great obstruction is caused to the study work. Therefore, the artificial aging research of the composite silicon rubber material in the acidic corrosion environment is not slow, and a real aging process and a method for simulating the composite insulator running in industrial acidic pollution need to be provided, so that a sample is provided for the research of an acidic corrosion mechanism, and the safe and stable running of a power grid is further ensured.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the system and the method are provided for artificially simulating the silicone rubber aging process in the acidic corrosive environment, and are used for solving the technical problems that in the prior art, researches on the corrosion mechanism of the acidic environment are not clear, but the composite insulator is difficult to obtain a sample in a single acidic corrosive environment, so that the researches are greatly hindered, and the like.
The technical scheme of the invention is as follows:
an artificial simulation system for an aging process of silicon rubber in an acidic corrosive environment comprises:
the voltage generator applies different voltages to the composite silicon rubber material sample according to requirements to simulate the voltage gradient of the insulator of the operating line;
the ultrasonic generator is used for emitting ultrasonic waves to the acid solutions with different pH values to atomize the acid solutions to form tiny water drops which are diffused in the acid-resistant test box and simulate the acid corrosion environment of the operating line;
the acid-resistant test chamber is used for placing the composite silicon rubber material sample;
the acidic corrosive liquid preparation device is used for preparing acidic corrosive liquids with different pH values;
the composite silicon rubber material sample is used for simulating an aging process under an acidic corrosion environment;
and the acid-resistant electrodes are used for applying uniform electric fields at two ends of the composite silicon rubber material sample and simulating electric fields at two ends of the insulator string of the operating line.
The voltage generator comprises a voltage regulator, a transformer, a resistor, a capacitor, a silicon stack and a grounding rod, so that the voltage generator can apply alternating current voltage or direct current voltage to the composite silicon rubber material sample and can be safely grounded after corrosion is finished.
The ultrasonic generator comprises a water tank and a nozzle, wherein the water tank is used for storing acidic corrosive liquid with a certain pH value, and the nozzle is used for spraying water mist of the corrosive liquid; the ultrasonic generator is externally arranged and fixed on the outer wall of the acid-proof test box; the nozzle extends into the acid-proof test box.
The acid-proof test box is a closed cavity with an opening and closing device, and is opened at any time when a composite silicon rubber material sample is placed and taken out, and is closed when the composite silicon rubber material sample is aged in an acid corrosion environment; the side wall of the acid-proof test box is provided with a round hole which can be deep into the pipe and is used for the nozzle pipe of the ultrasonic generator to stretch into; the acid-proof test box does not react with the acid corrosive liquid.
The acid-proof test box is provided with a temperature adjusting device for adjusting the environment temperature in the cavity to simulate the actual operation working condition of the composite insulator, and the temperature adjusting range is not narrower than-10 ℃ to 30 ℃.
The corrosive liquid preparation device comprises deionized water, concentrated nitric acid, concentrated hydrochloric acid, concentrated sulfuric acid, a brown glass bottle, a beaker, a measuring cylinder, a glass rod, a conductivity meter, a pen-type PH meter, a pipettor and a hygrothermograph; the conductivity of the deionized water is less than 20 mu S/cm, the precision of the thermometer is not lower than 1 ℃, the precision of the pen type PH meter is not lower than 0.02pH, and the conductivity of the to-be-prepared acidic corrosive liquid is not lower than 20 mu S/cm.
The acid-resistant electrode does not react with the acidic corrosive liquid, so that the influence of a reaction product on a test result is reduced; the electric field between the acid-proof electrodes is as uniform as possible so as to simulate the electric fields at two ends of an insulator string in an actual power transmission line; the acid-resistant electrode is tightly attached to the composite insulator sample, so that the influence of air gap discharge on the test result is avoided.
The simulation method of the artificial simulation system for the silicone rubber aging process in the acidic corrosive environment comprises the following steps:
s1, preparing sufficient acidic corrosive liquid with different pH values by using an acidic corrosive liquid preparation device;
s2, placing the composite silicon rubber material sample in an acid-resistant test box, and injecting an acid corrosive liquid into a water tank of an ultrasonic generator;
s3, controlling an ultrasonic generator to atomize the acidic corrosive liquid, and after the acid-resistant test box is filled with fog, controlling a voltage generator to apply voltage to the composite silicon rubber material sample to enable the surface of the silicon rubber composite material sample to pass through current and generate discharge;
and S4, after a preset time, closing the voltage generator, safely grounding the electrified system, closing the ultrasonic generator, taking out the composite silicon rubber material sample, observing whether the surface has obvious aging traces, if so, finishing the aging process of the acidic corrosive environment, otherwise, returning to the step S3, and continuing to perform the corrosion process of the acidic environment.
The simulation method of the artificial simulation system for the silicone rubber aging process in the acidic corrosive environment,
the step S1 of preparing the acid solution specifically includes:
s11, determining the volume of concentrated acid required by an acid solution with a certain pH value to be prepared and the volume of deionized water;
s12, a certain amount of deionized water is taken by a measuring cylinder and poured into a beaker;
s13, measuring a certain amount of concentrated acid volume by using a liquid taking device, slowly pouring the concentrated acid volume into a beaker along the wall of the beaker, and stirring continuously by using a glass rod without touching the wall of the beaker;
s14, measuring the pH value of the prepared solution, storing the solution in a brown glass bottle, labeling the solution, and indicating the solution information.
The volume of the concentrated acid and the deionized water is calculated as follows:
from C1V1＝C2V2E.g. preparing dilute nitric acid, C1The mass fraction of the commercial concentrated nitric acid is 65-68 percent according to the mass concentration of the concentrated nitric acid substances, C1A value of 14.40mol/L, V1Volume of concentrated nitric acid required, C2Is the quantity concentration of the substance of the solution to be prepared, V2Is the volume of the solution to be prepared to obtain V1，V2-V1The volume of the required deionized water is obtained;
the magnitude of the voltage applied by the voltage generator to the silicone rubber composite sample is determined by the following formula:
wherein U is a voltage value (kV) applied to a silicon rubber composite material sample, L is a creepage distance (cm or mm) of the surface of the silicon rubber composite material sample, and lambda is a specified creepage specific distance value (cm/kV or mm/kV) to be met under certain pollution conditions.
The invention has the beneficial effects that:
the device and the method can reflect the aging process of the live-line operation composite insulator in an acid corrosion environment and obtain an acid-etched sample, thereby helping technical and scientific research personnel to deeply research the corrosion mechanism of the acid environment and providing technical support for the safe and stable operation of a power grid; the technical problems that in the prior art, researches on corrosion mechanisms of an acid environment are not clear, but a composite insulator is difficult to obtain a sample in a single acid corrosion environment, so that research work is greatly hindered and the like are solved.
Description of the drawings:
FIG. 1 is a flow chart of a method of the present invention;
FIG. 2 is a schematic view of a sample of compounded silicone rubber material in an embodiment of the present invention;
FIG. 3 is a diagram of the arrangement of the apparatus of the present invention.
The specific implementation mode is as follows:
the invention comprises the following steps:
the voltage generator applies different voltages to the composite silicon rubber material sample according to requirements to simulate the voltage gradient of the insulator of the operating line;
the ultrasonic generator is used for emitting ultrasonic waves to the acid solutions with different pH values to atomize the acid solutions to form tiny water drops which are diffused in the acid-resistant test box and simulate the acid corrosion environment of the operating line;
the acid-resistant test box is used for placing the composite silicon rubber material sample and extending into a nozzle pipe of the ultrasonic generator;
the corrosive liquid preparation device is used for preparing acidic corrosive liquids with different pH values;
the composite silicon rubber material sample is used for simulating an aging process under an acidic corrosion environment;
and the acid-resistant electrodes are used for applying uniform electric fields at two ends of the composite silicon rubber material sample and simulating electric fields at two ends of the insulator string of the operating line.
Further, the composite silicon rubber material sample is directly provided by a composite insulator manufacturer; or
The silicone rubber composite material sample is manufactured according to a formula provided by a composite insulator manufacturer so as to ensure that each physical and chemical property of the silicone rubber composite material sample is consistent with that of the composite insulator applied to the insulation configuration of the power transmission line. In this embodiment, the composite silicone rubber material sample is a rectangular silicone rubber slice provided by a composite insulator manufacturer, the length of the rectangular silicone rubber slice is 150mm, the width of the rectangular silicone rubber slice is 120mm, the thickness of the rectangular silicone rubber slice is 6mm, and the formula of the rectangular silicone rubber slice is consistent with that of an actually-operated composite insulator.
Further, the voltage generator should include necessary devices such as a voltage regulator, a transformer, a resistor, a capacitor, a silicon stack, a ground rod and the like, so as to ensure that the voltage generator can apply alternating current voltage or direct current voltage of a certain magnitude to the composite silicon rubber material sample, and the system can be safely grounded after acid etching is finished. In this embodiment, the voltage applied to the silicone rubber composite material sample by the voltage generator is an alternating voltage, and the arrangement and connection relationship between each circuit element and the composite silicone rubber material sample, the ultrasonic generator, the acid-proof test chamber, and the like are shown in fig. 3, where T is a transformer and R is0In order to protect the resistor, E represents an acid-resistant test chamber, F represents an ultrasonic generator, and the tail end of the composite silicon rubber material sample is connected with a low potential point of the transformer and grounded.
Further, the ultrasonic generator should include necessary devices such as a water tank and a nozzle to ensure that the ultrasonic generator atomizes and sprays the etching solution.
Furthermore, ultrasonic generator adopts external, the water tank is used for storing the acid corrosive liquid that has certain pH value, and the nozzle is used for spouting corrosive liquid water smoke.
Further, the acid-proof test box is a closed cavity with an openable device, and the acid-proof test box can be opened at any time when a composite silicon rubber material sample is placed and taken out, and can be closed when the acid corrosion environment is aged. The acid-proof test box is a round hole with a side wall capable of extending into the pipe, and a nozzle pipe of the ultrasonic generator can extend into the round hole. The acid-proof test chamber should not react with the acidic corrosive liquid. In this embodiment, the acid-proof test chamber is built by the ya keli board.
Furthermore, the acid-proof test box also has the function of adjusting the environmental temperature in the cavity so as to simulate the actual operation condition of the composite insulator, and the temperature adjusting range is not narrower than-10 ℃ to 30 ℃. In this embodiment, the temperature adjustment range of the acid-proof test chamber is-36 ℃ to 40 ℃.
Further, the corrosive liquid preparation device comprises necessary devices such as deionized water, concentrated nitric acid, concentrated hydrochloric acid, concentrated sulfuric acid, a brown glass bottle, a beaker, a measuring cylinder, a glass rod, a conductivity meter, a pen type PH meter, a liquid transfer device, a temperature and humidity meter and the like, the conductivity of the deionized water is less than 20 mu S/cm, the precision of the thermometer is not lower than 1 ℃, the precision of the pen type PH meter is not lower than 0.02pH, and the conductivity of the to-be-prepared acidic corrosive liquid is not lower than 20 mu S/cm. In this example, the conductivity of deionized water was 9.25. mu.S/cm, the thermometer precision was 0.1 ℃ and the pen pH meter precision was 0.02 pH.
Further, the acid-resistant electrode should not react with the acidic corrosive liquid, so that the influence of reaction products on test results is reduced; the electric field between the acid-proof electrodes is as uniform as possible so as to simulate the electric fields at two ends of an insulator string in an actual power transmission line; the acid-resistant electrode is tightly attached to the composite insulator sample, so that the influence of air gap discharge on the test result is avoided. In this embodiment, the electrodes are Ti electrodes, each having a length of 120mm, a width of 12.5mm, a peripheral chamfer radius of 3mm, and a thickness of 0.3 mm.
Correspondingly, as shown in fig. 1, the invention provides a charged aging process and method for a composite silicone rubber material in an acidic corrosive environment, comprising the following steps:
s1, preparing sufficient acidic corrosive liquid with different pH values by using a corrosive liquid preparation device;
s2, placing the composite silicon rubber material sample in an acid-resistant test box, arranging an ultrasonic generator externally, enabling a nozzle pipe of the ultrasonic generator to penetrate into the acid-resistant test box, and injecting an acid corrosive liquid into a water tank of the ultrasonic generator;
s3, controlling an ultrasonic generator to atomize the acidic corrosive liquid, and after the acid-resistant test box is filled with fog, controlling a voltage generator to apply a certain voltage to the composite silicon rubber material sample to enable the surface of the silicon rubber composite material sample to pass through current and generate discharge;
and S4, after a preset time, closing the voltage generator, safely grounding the electrified system, closing the ultrasonic generator, taking out the composite silicon rubber material sample, observing whether the surface of the composite silicon rubber material sample has an obvious aging trace, finishing the aging process of the acidic corrosion environment if the surface of the composite silicon rubber material sample has the obvious aging trace, returning to the step S3 if the surface of the composite silicon rubber material sample does not have the obvious aging trace, and continuously carrying out the acidic environment corrosion process on the composite silicon rubber material sample. In the embodiment, after 8 hours of corrosion, obvious discharge traces appear on the surface of the composite silicon rubber material sample, so that the simulation corrosion process is finished, and the composite silicon rubber material sample is taken out for further research.
Further, the preparing the acid solution in the step S1 specifically includes:
s11, determining the volume of concentrated acid required by an acid solution with a certain pH value to be prepared and the volume of deionized water;
s12, a certain amount of deionized water is taken by a measuring cylinder and poured into a beaker;
s13, measuring a certain amount of concentrated acid volume by using a liquid taking device, slowly pouring the concentrated acid volume into a beaker along the wall of the beaker, and meanwhile, continuously stirring by using a glass rod, wherein the glass rod does not touch the wall of the beaker;
s14, measuring the pH value of the prepared solution, storing the solution in a brown glass bottle, labeling the solution, and indicating the solution information.
The volume of the concentrated acid and the deionized water in the preparation step S11 is calculated as follows:
from C1V1＝C2V2E.g. preparing dilute nitric acid, C1The mass fraction of the commercial concentrated nitric acid is 65-68 percent, and the mass fraction is C1A value of about 14.40mol/L, V1Volume of concentrated nitric acid required, C2Is the quantity concentration of the substance of the solution to be prepared, V2V is obtained as the volume of the solution to be prepared1，V2-V1I.e. the volume of deionized water required. In this example, 1L, C nitric acid having pH of 1 was prepared1＝14.40mol/L，C2＝0.1mol/L,V21L, then V16.9 μ L, volume V of deionized water required2-V1About 1L.
Further, the magnitude of the voltage applied to the silicone rubber composite sample by the voltage generator in the step S3 is determined by the following formula:
wherein U is a voltage value (kV) applied on a silicone rubber composite material sample, L is a creepage distance (cm or mm) of the surface of the silicone rubber composite material sample, and lambda is a specified creepage specific distance value (cm/kV or mm/kV) to be met under certain pollution conditions, and the creepage specific distance value can be known by GB/T26218.3,2011 and DL/T810-. In the present embodiment, as shown in fig. 2, the unit in the figure: mm. HV represents the connection of a high-voltage end, and GND represents grounding; the acid-resistant electrodes are clamped at two ends of the silicon rubber composite material sample, and the width of each electrode is 12.5mm, so that the creepage distance L of the silicon rubber composite material sample is 125mm, the creepage specific distance value lambda under the specified medium-pollution condition is 34.7mm/kV, and the calculated U is 3.6 kV.
Claims (10)
1. An acid corrosion environment silicone rubber aging process artificial simulation system is characterized in that: it includes:
the voltage generator applies different voltages to the composite silicon rubber material sample according to requirements to simulate the voltage gradient of the insulator of the operating line;
the ultrasonic generator is used for emitting ultrasonic waves to the acid solutions with different pH values to atomize the acid solutions to form tiny water drops which are diffused in the acid-resistant test box and simulate the acid corrosion environment of the operating line;
the acid-resistant test chamber is used for placing the composite silicon rubber material sample;
the acidic corrosive liquid preparation device is used for preparing acidic corrosive liquids with different pH values;
the composite silicon rubber material sample is used for simulating an aging process under an acidic corrosion environment;
and the acid-resistant electrodes are used for applying uniform electric fields at two ends of the composite silicon rubber material sample and simulating electric fields at two ends of the insulator string of the operating line.
2. The system for artificially simulating the aging process of the silicone rubber in the acidic corrosive environment according to claim 1, wherein: the voltage generator comprises a voltage regulator, a transformer, a resistor, a capacitor, a silicon stack and a grounding rod, so that the voltage generator can apply alternating current voltage or direct current voltage to the composite silicon rubber material sample and can be safely grounded after corrosion is finished.
3. The system for artificially simulating the aging process of the silicone rubber in the acidic corrosive environment according to claim 1, wherein: the ultrasonic generator comprises a water tank and a nozzle, wherein the water tank is used for storing acidic corrosive liquid with a certain pH value, and the nozzle is used for spraying water mist of the corrosive liquid; the ultrasonic generator is externally arranged and fixed on the outer wall of the acid-proof test box; the nozzle extends into the acid-proof test box.
4. The system for artificially simulating the aging process of the silicone rubber in the acidic corrosive environment according to claim 1, wherein: the acid-proof test box is a closed cavity with an opening and closing device, and is opened at any time when a composite silicon rubber material sample is placed and taken out, and is closed when the composite silicon rubber material sample is aged in an acid corrosion environment; the side wall of the acid-proof test box is provided with a round hole which can be deep into the pipe and is used for the nozzle pipe of the ultrasonic generator to stretch into; the acid-proof test box does not react with the acid corrosive liquid.
5. The system for artificially simulating the aging process of the silicone rubber in the acidic corrosive environment according to claim 1, wherein: the acid-proof test box is provided with a temperature adjusting device for adjusting the environment temperature in the cavity to simulate the actual operation working condition of the composite insulator, and the temperature adjusting range is not narrower than-10 ℃ to 30 ℃.
6. The system for artificially simulating the aging process of the silicone rubber in the acidic corrosive environment according to claim 1, wherein: the corrosive liquid preparation device comprises deionized water, concentrated nitric acid, concentrated hydrochloric acid, concentrated sulfuric acid, a brown glass bottle, a beaker, a measuring cylinder, a glass rod, a conductivity meter, a pen-type PH meter, a pipettor and a hygrothermograph; the conductivity of the deionized water is less than 20 mu S/cm, the precision of the thermometer is not lower than 1 ℃, the precision of the pen type PH meter is not lower than 0.02pH, and the conductivity of the to-be-prepared acidic corrosive liquid is not lower than 20 mu S/cm.
7. The system for artificially simulating the aging process of the silicone rubber in the acidic corrosive environment according to claim 1, wherein: the acid-resistant electrode does not react with the acidic corrosive liquid, so that the influence of a reaction product on a test result is reduced; the electric field between the acid-proof electrodes is as uniform as possible so as to simulate the electric fields at two ends of an insulator string in an actual power transmission line; the acid-resistant electrode is tightly attached to the composite insulator sample, so that the influence of air gap discharge on the test result is avoided.
8. The simulation method of the artificial simulation system for the aging process of the silicone rubber in the acidic corrosive environment according to claim 1, which comprises the following steps:
s1, preparing sufficient acidic corrosive liquid with different pH values by using an acidic corrosive liquid preparation device;
s2, placing the composite silicon rubber material sample in an acid-resistant test box, and injecting an acid corrosive liquid into a water tank of an ultrasonic generator;
s3, controlling an ultrasonic generator to atomize the acidic corrosive liquid, and after the acid-resistant test box is filled with fog, controlling a voltage generator to apply voltage to the composite silicon rubber material sample to enable the surface of the silicon rubber composite material sample to pass through current and generate discharge;
and S4, after a preset time, closing the voltage generator, safely grounding the electrified system, closing the ultrasonic generator, taking out the composite silicon rubber material sample, observing whether the surface has obvious aging traces, if so, finishing the aging process of the acidic corrosive environment, otherwise, returning to the step S3, and continuing to perform the corrosion process of the acidic environment.
9. The simulation method of the artificial simulation system for the aging process of the silicone rubber in the acidic corrosive environment according to claim 8, wherein the simulation method comprises the following steps:
the step S1 of preparing the acid solution specifically includes:
s11, determining the volume of concentrated acid required by an acid solution with a certain pH value to be prepared and the volume of deionized water;
s12, a certain amount of deionized water is taken by a measuring cylinder and poured into a beaker;
s13, measuring a certain amount of concentrated acid volume by using a liquid taking device, slowly pouring the concentrated acid volume into a beaker along the wall of the beaker, and stirring continuously by using a glass rod without touching the wall of the beaker;
s14, measuring the pH value of the prepared solution, storing the solution in a brown glass bottle, labeling the solution, and indicating the solution information.
10. The simulation method of the artificial simulation system for the aging process of the silicone rubber in the acidic corrosive environment according to claim 9, wherein: the volume of the concentrated acid and the deionized water is calculated as follows:
from C1V1＝C2V2E.g. preparing dilute nitric acid, C1The mass fraction of the commercial concentrated nitric acid is 65-68 percent according to the mass concentration of the concentrated nitric acid substances, C1A value of 14.40mol/L, V1Volume of concentrated nitric acid required, C2Is the quantity concentration of the substance of the solution to be prepared, V2Is the volume of the solution to be prepared to obtain V1，V2-V1The volume of the required deionized water is obtained;
the magnitude of the voltage applied by the voltage generator to the silicone rubber composite sample is determined by the following formula:
wherein U is a voltage value (kV) applied to a silicon rubber composite material sample, L is a creepage distance (cm or mm) of the surface of the silicon rubber composite material sample, and lambda is a specified creepage specific distance value (cm/kV or mm/kV) to be met under certain pollution conditions.
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| CN202110502170.XA CN113188988A (en) | 2021-05-08 | 2021-05-08 | Artificial simulation system and simulation method for silicon rubber aging process in acidic corrosive environment |
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