CN109283440B - Negative pressure type simulation test analysis platform with controllable environmental conditions - Google Patents

Abstract

The invention discloses a negative pressure type simulation test analysis platform with controllable environmental conditions, wherein the system comprises: the device comprises a simulation device for simulating different environmental conditions and a test analysis device for monitoring tested conductor samples under different simulated environmental conditions; the simulation apparatus includes: the device comprises a combustion chamber, a negative pressure deposition chamber and a control assembly; the test analysis device includes: environmental parameter measuring device, monitoring devices and data analysis platform. By implementing the scheme disclosed by the invention, the controllable simulation environment is realized, and the surface appearance of the wire, the electric precipitation and the corona discharge condition under different simulation conditions are detected and analyzed.

Description

A negative pressure simulation test and analysis platform with controllable environmental conditions

technical field

The invention relates to the technical field of electricity transmission, in particular to a negative pressure simulation test and analysis platform with controllable environmental conditions.

Background technique

In recent years, air pollution has become more and more serious, and transmission lines are directly affected by the atmospheric environment during long-term operation. When the high-voltage transmission line is exposed to the atmospheric environment with airborne particles for a long time, the particles will adhere to the surface of the wire to form contamination, change the surface characteristics of the wire, and then affect the corona characteristics of the wire, making the electromagnetic environment of the transmission line more complex.

With the aggravation of the harsh environment, the polluted particles in the environment adhere to the surface of the wire, which leads to the drop of the corona inception voltage and the increase of the corona loss, and also endangers the safe operation of the transmission line. As a result, analytical testing and follow-up studies on the corona effect of wires after deposition of particulate matter have received increasing attention, mainly including particulate matter generation, particulate matter transport, particulate matter accumulation in a closed container (closed container with electrodes), and subsequent accumulation in the container Conduct relevant tests or remove samples for follow-up research. In general, the relevant tests carried out refer to the tests on the corona effect of the wires after depositing particles, mainly testing the corona discharge initiation voltage, the synthetic electric field at the cage, the ion current density at the cage and the electric field. Corona current pulses produced by corona discharge. The follow-up research refers to the scanning electron microscope observation of the surface morphology and the energy spectrum analysis of the surface composition of the wire samples with deposited particles, and these studies will also be carried out in this application.

At present, according to the inventor of the present application, after a lot of research and investigation, there are three types of platforms in the industry:

1. The first type of platform

The particulate matter is generated by the aerosol generator system, and the particulate matter is transported from the pipeline to the test tube tank through an external gas cylinder.

However, the inventors of the present application found that the amount of particulate matter generated by the aerosol generator is too small in this solution, so in order to maintain a certain concentration, the volume of the closed container is smaller, and the size of the smaller closed container (especially the high-voltage electrode pair The distance between the four walls of the container) cannot meet the electrical insulation design under high voltage, specifically refers to the anti-breakdown design that cannot meet the air gap, and it is easy to cause breakdown of the air gap between the electrode and the four walls of the container when the test voltage is not enough. Therefore, Relevant tests under high voltage cannot be carried out, mainly testing the initial voltage of corona discharge, the synthetic electric field at the cage body, the ion current density at the cage body and the corona current pulse generated by corona discharge.

2. The second type of platform

Particles are generated by combustion or atomizer, and are sprayed into larger closed containers through pipes for relevant tests; however, in order to meet the electrical insulation design of such solutions, the container volume is large, which is likely to lead to the concentration and uniformity of particulate matter in the container. It is difficult to control and adjust, and because the device needs to quantitatively analyze the effect of particle concentration on the corona discharge characteristics of the wire (mainly including corona onset voltage, synthetic electric field, ion current density and corona current) when the particles are uniformly distributed, so If the uniformity of the particles in the container and the quantitative adjustment of the concentration cannot be well controlled, subsequent quantitative analysis will be difficult.

In addition, the inventor of the present application also found that there is a problem in both the first and second types of solutions: the free charges generated by the discharge will accumulate on the four walls of the closed container, which will cause errors in the test of the corona discharge effect. Here The main reason is that the accumulated charges on the four walls will generate an electric field, which will interfere with the original electric field distribution in the container and cause errors in the measurement of corona characteristics. In this regard, the design adopts two methods to avoid the influence of accumulated charge, one is passive shielding by corona cage, and the other is adding anti-static coating on the four walls of the deposition chamber.

3. The third type of platform

A jet mill was used as a particle generator and then diffused into a larger climatic chamber for testing; however, this type of solution uses a jet mill and a larger climatic chamber, both of which are overly bulky. It is not conducive to the convenience of experiment and test development, and it is not movable. Since the price of the jet mill is basically more than 10,000 yuan, its use cost is also relatively expensive.

At the same time, the inventors of the present application have also found through extensive research that none of the above three schemes can control the particle size, which is very important for the test of the corona effect of the wires after the particles are deposited.

SUMMARY OF THE INVENTION

In view of this, in order to solve the above-mentioned technical problems, the embodiment of the present invention proposes a negative pressure simulation test and analysis platform with controllable environmental conditions, which can realize the controllability of the simulation environment, and analyze the surface topography and electrical characteristics of the wire under different simulation conditions. Detection and analysis of dust removal and corona discharge.

In order to solve the above-mentioned technical problems, the embodiments of the present invention disclose the following technical solutions, including:

In an embodiment of the present invention, a negative pressure simulation test and analysis platform with controllable environmental conditions is disclosed. The platform includes: a simulation device for simulating different environmental conditions and a conductor for monitoring the tested conductors under different simulated environmental conditions Test analysis devices for samples; wherein:

A) The simulation device includes:

Combustion chambers, which are used to create contaminants that simulate the environment;

Negative pressure deposition chamber, with built-in segmented corona cage and tested conductor samples arranged in the corona cage; the negative pressure deposition chamber is used to introduce and make the pollutants in the simulated environment by using the principle of negative pressure deposition on the wire sample under test;

a control assembly, arranged on the communication channel between the combustion chamber and the deposition chamber, for controlling and monitoring the size and flow of the simulated pollutants;

B) The test and analysis device includes:

an environmental parameter measuring device, connected to the deposition chamber, for measuring the simulated environmental parameters in the deposition chamber;

a monitoring device for monitoring the morphology data of the conductor sample and the related data of the corona discharge effect;

The data analysis platform is used to analyze the data related to the corona discharge effect and output the analysis results.

In an optional embodiment, the monitoring device further includes:

The nanovoltmeter is provided with an ion flow plate, and the ion flow plate is arranged on the outside of the corona cage for measuring the ion flow density;

Field grinding, which is provided with a field grinding probe, and the field grinding probe is arranged on the outside of the corona cage and is used to measure the synthetic electric field;

High-voltage power supply to supply power to the conductor sample under test;

A corona current measuring device, connected to the tested conductor sample, is used for measuring the corona current data of the tested conductor sample.

As an optional embodiment, the corona current measuring device further includes:

Measuring capacitance, connecting with the tested conductor sample for voltage division;

a sampling resistor, connected with the measuring capacitor, for converting the corona current signal generated by the corona discharge into a voltage signal;

The acquisition card is connected with the measuring capacitor and the sampling resistor respectively, and is used for measuring the corona current data generated by the tested conductor sample and receiving the voltage signal.

Optionally, based on any of the foregoing embodiments, the data analysis platform includes:

a corona identification module for determining whether corona discharge occurs according to various effects of corona discharge measured by the data measuring device;

The corona analysis module is used to define the corona discharge intensity according to the pulse intensity and frequency of the corona current monitored when it is determined that the corona discharge occurs, so as to realize the detection and analysis of the discharge effect under different conditions;

The surface state analysis module is used to establish the corresponding relationship between the corona discharge intensity and the surface morphology state of the wire sample according to the obtained conductor sample morphology data corresponding to different corona discharge data, and to analyze and obtain the conductor surface contamination on the electrical conductivity. Effects of corona current pulses.

Optionally, based on any of the above-mentioned embodiments, the inner wall of the negative pressure deposition chamber is coated with an anti-static coating, and an observation hole is provided on the wall body, and an external ultraviolet camera or a high-speed CCD (charged) is provided on the observation hole. Coupled device) camera to observe corona discharge and particle deposition in the deposition chamber.

Optionally, based on any of the above embodiments, the negative pressure deposition chamber is configured with a vacuum device for forming a negative pressure in the chamber, so that the airflow simulated by the combustion chamber enters the deposition chamber under the guidance of the negative pressure; The deposition chamber is provided with a side door, and the high-voltage power supply passes through the side door and is connected to the tested conductor sample.

Optionally, based on any of the above embodiments, the tested conductor sample is located on the central axis of the corona cage; two ends of the tested conductor sample are provided with shielding balls, and the shielding balls are connected to the insulating rod, The insulating rod is fixedly connected to the inner wall of the deposition chamber.

Optionally, based on any of the foregoing embodiments, the environmental parameter measurement device includes:

a concentration meter, arranged on the outside of the deposition chamber, for measuring the concentration of pollutants inside the deposition chamber;

an air pressure gauge, arranged outside the deposition chamber, for measuring the air pressure inside the deposition chamber;

A thermo-hygrometer, disposed outside the deposition chamber, is used to measure the temperature and humidity inside the deposition chamber.

Optionally, based on any of the foregoing embodiments, the control component further includes:

a valve, arranged on the communication channel between the combustion chamber and the deposition chamber, for controlling the opening and closing of the pollutant channel;

A particle size filter, arranged at the pollutant inlet, used to control the particle size of the particles passed into the negative pressure deposition chamber;

A tachometer is arranged on the communication channel between the combustion chamber and the negative pressure deposition chamber, and is used for measuring the flow rate of the pollutants.

Optionally, based on any of the above embodiments, the combustion chamber further includes: a first combustion chamber and a second combustion chamber that are stacked on top of each other;

The first and second combustion chambers are respectively communicated with the deposition chamber through first and second communication passages;

The first communication channel is provided with a first valve, a first particle size filter and a first tachometer, and the second communication channel is provided with a second valve, a second particle size filter and a second tachometer.

Optionally, based on any of the above embodiments, the negative pressure simulation test and analysis platform with controllable environmental conditions may further include:

A water-cooling pipe is arranged on the outside of the communication channel between the combustion chamber and the deposition chamber, and the water flow direction in the water-cooling channel is arranged in the opposite direction to the gas flow direction of the communication channel, so as to reduce the flue gas temperature of simulated pollutants and the effect of the heat release of the combustion chamber on the simulated test.

Compared with the prior art, the technical solutions disclosed in the embodiments of the present invention have the following advantages:

After adopting the technical solution of the embodiment of the present invention, using simulation modeling and analysis, mainly to establish an electrode model of a coaxial cylinder, combined with the principle of negative pressure, to design a simulation device and analysis that can simulate environmental conditions and control the fouling deposition process. The device not only facilitates operation and mobility, but also realizes the integration of the corona discharge characteristic test, which is conducive to the convenient testing of various effects of corona discharge with a set of equipment, and realizes the realization of the discharge effect under different conditions. detection and analysis.

Therefore, the simulation analysis test system disclosed in the embodiment of the present invention can not only detect the corona discharge strength of the wire under different haze concentrations, but also detect the electrostatic precipitator efficiency under different particle concentrations and different electrode structures, and obtain different conditions. The sample of the wire under the bottom, and then the surface state of the wire is obtained.

More features and advantages of the embodiments of the present invention will be described in the following detailed description.

Description of drawings

The accompanying drawings constituting a part of the embodiments of the present invention are used to provide further understanding of the embodiments of the present invention, and the schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the attached image:

1 is a schematic diagram of the composition of a negative pressure simulation test and analysis platform with controllable environmental conditions provided by an embodiment of the present invention;

2 is a schematic diagram of the composition of another negative pressure simulation test and analysis platform with controllable environmental conditions provided by an embodiment of the present invention;

3 is a schematic diagram of a data monitoring process of a negative pressure simulation test and analysis platform with controllable environmental conditions in an embodiment of the present invention;

4 is a schematic diagram of the correspondence between the input and output of a data monitoring object disclosed in an embodiment of the present invention;

5 is a schematic diagram of a data analysis process disclosed in an embodiment of the present invention;

6 is a schematic cross-sectional view of a segmented corona cage in a negative pressure simulation test and analysis platform with controllable environmental conditions according to an embodiment of the present invention; and

7 is a schematic longitudinal cross-sectional view of a segmented corona cage in a negative pressure simulation test and analysis platform with controllable environmental conditions according to an embodiment of the present invention.

Description of reference numerals

100 combustion chamber

100a First combustion chamber

100b second combustion chamber

101 Combustion chamber side door

101a First combustion chamber side door

101b Second combustion chamber side door

102 Connecting Channels

102a The first communication channel

102b Second communication channel

103a First Tachymeter

103b Second Tachymeter

104a First valve

104b Second valve

200 deposition chamber

201 Segmented Corona Cage

202 Vacuuming device

203 nanovoltmeter

204 Field Grinding

205 Deposition chamber side door

206 viewing hole

207 Thermohygrometer

208 Barometer

209 Concentration meter

210 High Voltage Power Supply

211 Corona Cage Bracket

212 Conductor samples

213 Ion flow plate

214 Field Grinding Probe

215 Shield Ball

216 Insulation rod

300 Test Analysis Unit

301 Measuring capacitance

302 Sampling resistor

303 capture card

304 Data Analysis Platform

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

Below in conjunction with accompanying drawing, each embodiment of the present invention is further described:

The present invention designs a negative pressure simulation test and analysis platform with controllable environmental conditions, which is used for particle accumulation simulation with controllable environmental conditions to conduct corona discharge tests. The pressure simulation test and analysis platform will further explain:

The negative pressure simulation test and analysis platform with controllable environmental conditions includes: a simulation device for simulating different environmental conditions and a test and analysis device for monitoring tested conductor samples under different simulated environmental conditions.

In this embodiment, as shown in FIG. 1 , the above-mentioned simulation device further includes: a combustion chamber 100 , a negative pressure deposition chamber 200 and a control component, wherein the combustion chamber 100 is used for producing pollutants in the simulated environment, and the negative pressure deposition chamber 200 is built in There are segmented corona cages 201 and tested conductor samples 212 arranged in the corona cages 201 . The negative pressure deposition chamber 200 is used to introduce contaminants from the simulated environment and deposit them on the wire sample 212 under test by using the principle of negative pressure. The control assembly is arranged on the communication channel 102 between the combustion chamber 100 and the negative pressure deposition chamber 200, and is used for controlling and monitoring the size and flow of the simulated environment particle pollutants.

In this embodiment, as shown in FIG. 1 , the above-mentioned test and analysis device 300 further includes: an environmental parameter measurement device, a monitoring device, and a data analysis platform. Wherein: the environmental parameter measuring device is connected to the negative pressure deposition chamber 200 for measuring the simulated environmental parameters in the deposition chamber 200 . The monitoring device is used to monitor the topographic data of the conductor sample 212 and the related data of the corona discharge effect. The data analysis platform is used to analyze the data related to the corona discharge effect and output the analysis results.

In this embodiment, the negative pressure simulation test and analysis platform with controllable environmental conditions is used to study the influence of different simulation environments on the corona discharge characteristics of the surface-deposited particulate matter wires, and can test the synthetic electric field and ion current under different environmental conditions and structures. Density, corona current, concentration change and surface state can be adjusted to suit different test objects according to different needs.

As an optional implementation manner, as shown in FIG. 2 , the monitoring device in the above embodiment further includes: a nanovoltmeter 203 and an ion current plate 213 , a field mill 204 and its probe 214 , a corona current measuring device and a high voltage The power supply 210, wherein: the nanovoltmeter 203 is provided with an ion flow plate 213, and the ion flow plate 213 is arranged outside the corona cage 201 for measuring the ion flow density. The field grinding 204 is provided with a field grinding probe 214, and the field grinding probe 214 is disposed on the outer side of the segmented corona cage 201 for measuring the resultant electric field. The high-voltage power supply 210 supplies power to the conductor sample 212 under test, adopts the method of cable introduction, and uses the insulating layer of the high-voltage cable to achieve the purpose of insulation, so as to avoid introducing high voltage into a small space that requires good air tightness. Discharge nearby, and even lead to breakdown problems. The corona current measuring device is connected to the tested conductor sample 212 for measuring the corona current data of the tested conductor sample 212 .

It should be noted that the corona current measurement device can be changed to high-voltage terminal measurement to improve the measurement accuracy, for example: by canceling the voltage dividing capacitor, placing the measurement device directly connected to the wire, and placing the measurement part in the Faraday cage, through The electro-optical converter and the optical-electrical converter connected by the optical fiber transmit the measurement data to the computer, so as to realize the measurement of the high-voltage terminal. In this way, the interference of the voltage dividing capacitor on the current signal is removed, thereby improving the measurement accuracy.

In addition, according to the size of the deposition chamber and the corona cage, the electrical high-voltage insulation is designed in this embodiment. For example, the radial size of the corona cage in this embodiment can ensure that under the action of the highest applied voltage, no Air gap breakdown; for another example, the length of the guard section adopted in this embodiment can minimize the influence of the distortion of the electric field at the end.

As an optional implementation manner, as shown in FIG. 2 , the corona current measurement device in the above embodiment further includes: a measurement capacitor 301, a sampling resistor 302 and a collection card 303, wherein:

The measuring capacitor 301 is connected with the conductor sample 212 to be measured, and is used to divide the voltage to provide a suitable voltage for the measuring section device;

The sampling resistor 302 is connected to the measuring capacitor 301, and is used to convert the current signal into a voltage signal, which is convenient for the acquisition card to collect data;

The acquisition card 303 is respectively connected with the measuring capacitor 301 and the sampling resistor 302, and is used for measuring the corona current data generated by the conductor sample 212 under test and receiving the voltage signal.

Here, the working process of the simulation test analysis in the above-mentioned embodiment is illustrated with reference to FIG. 3 and the following examples:

S1: Close the deposition chamber, close the valve on the communication channel between the combustion chamber and the deposition chamber, and cut off the connection between the combustion chamber and the deposition chamber;

S2: Start the negative pressure pumping device to pump negative pressure to the deposition chamber, and the temperature in the deposition chamber can be adjusted by the configured heater;

S3: Burn incense in the combustion chamber to generate particulate matter;

S4: Open the valve on the communication channel between the combustion chamber and the deposition chamber, and introduce particulate matter into the deposition chamber;

S5: Wait for the particles to diffuse to uniformity, and complete the accumulation of particles for a certain period of time.

S6: Measure the relevant corona discharge characteristics, such as synthetic electric field, ion current density and corona current, through the monitoring device, analyze the measured data through the data analysis platform, and obtain the corresponding simulated environment for the corona discharge characteristics of the surface deposited particulate matter wire Impact.

As an optional implementation manner, the data analysis platform in the above-mentioned embodiment further includes: a corona identification module, a corona analysis module and a surface state analysis module, wherein: the corona identification module is used to measure the data obtained by the data measurement device. Various effects of corona discharge to determine whether corona discharge occurs. The corona analysis module is used to define the corona discharge intensity according to the pulse intensity and frequency of the corona current monitored when corona discharge is determined, so as to realize the detection and analysis of the discharge effect under different conditions. The surface state analysis module is used to establish the corresponding relationship between the corona discharge intensity and the surface morphology state of the conductor sample according to the obtained conductor sample morphology data corresponding to different corona discharge data, and to analyze the influence of the conductor surface contamination on the corona current pulse. .

Here, with reference to Figure 4 and Figure 5, the data analysis process of the negative pressure simulation test and analysis platform with controllable environmental conditions in the above-mentioned embodiment is described as follows:

In the above embodiment, the data mainly processed by the data analysis platform is the current signal on the sampling resistor. The current signal is derived from the corona current generated by the wire due to corona discharge, a current flowing through the loop formed by the wire, the air gap between the wire and the ground, and the ground. This embodiment designs an integrated and convenient device for corona discharge characteristic test. The main corona characteristic test contents include synthetic electric field, ion current density, and corona current measurement. The wall surface, and its related measurement equipment including electric field tester, nanovoltmeter, etc. are fixedly installed in the device, thereby realizing integration and convenience, which is conducive to testing various effects of corona discharge, and realizing the detection of discharge effects under different conditions. and analyse.

In this embodiment, by monitoring this current and performing data processing, the following objectives can be achieved:

1) Determine whether corona discharge occurs by monitoring whether corona current pulse occurs. Since the accumulation of particles on the surface of the wire is different before and after corona discharge, whether corona discharge can be effectively detected or not? It is important to accurately analyze the correlation between conductor surface contamination and corona current pulses.

2) After detecting the occurrence of corona current pulse, the intensity of corona discharge can be quantitatively defined according to the intensity and frequency of corona current pulse, such as weak corona, moderate corona, severe corona, etc. In this way, samples of fouled wires under different corona discharge intensities were obtained, and the corona discharge intensities were related to the surface morphology of the wires.

3) At the same time, the influence of contamination on the corona discharge effect of corona current pulse can also be studied by analyzing the intensity and frequency of the corona current pulse.

Here, in conjunction with the following scenarios, the negative pressure simulation test and analysis platform with controllable environmental conditions disclosed in the above-mentioned embodiments is used to illustrate the specific application:

1) Using the negative pressure simulation test and analysis platform with controllable environmental conditions of the above-mentioned embodiment, the influence of some simulated environmental conditions (such as certain temperature and humidity) on the corona characteristics of the wire under the condition of particulate matter can be studied: by adjusting the deposition chamber temperature and humidity, a certain concentration of particulate matter is introduced, and then the corona discharge characteristics of the wire are detected.

2) Using the negative pressure simulation test and analysis platform with controllable environmental conditions of the above embodiment, it is possible to study the effect of some simulated environmental conditions (such as a certain temperature and humidity) on the corona characteristics of the needle electrode discharge in the needle plate electrode under the condition of particulate matter. Influence: By adjusting the temperature and humidity in the deposition chamber, a certain concentration of particulate matter is introduced, and then the corona discharge characteristics of the needle electrode are detected. The process is further explained as follows: Change the electrode type in the device according to the electrode structure. The needle plate electrode is replaced into the device; according to the object to be studied, such as the influence of temperature, the temperature in the device is adjusted to the temperature required by the experiment through a heater or dry ice; then the particulate matter is introduced to adjust the concentration of the particulate matter; then at the current temperature Measure various corona discharge characteristics in the needle plate electrode, including synthetic electric field, ion current density, corona current; repeatedly adjust the temperature and particle concentration, repeat the measurement, and finally obtain the corona discharge characteristics under different particle concentrations. The change of temperature can get the final influence law.

3) Study the influence of environmental conditions (temperature and humidity) on the pollution characteristics of the fouled insulator strings under the condition of particulate matter: by adjusting the temperature and humidity in the deposition chamber, a certain concentration of particulate matter is introduced, and then the pollution characteristics are detected.

4) Study the influence of environmental conditions (temperature and humidity) on the corona characteristics of the wire under the condition of particulate matter: By adjusting the temperature and humidity in the deposition chamber, a certain concentration of particulate matter is introduced, and then the corona discharge characteristics of the wire are detected.

5) Study how the particle deposition changes the surface morphology of the wire under different voltages: By adjusting the voltage on the wire, a certain concentration of particles is introduced to carry out the particle deposition experiment, and then the wire sample is taken out, and the surface morphology is observed by an electron scanning microscope. , to obtain observations and compare them with clean wires.

6) Study how particle deposition changes the surface morphology of the wire under different environmental conditions (temperature and humidity): By adjusting the temperature and humidity in the deposition chamber, a certain concentration of particles is introduced to conduct particle deposition experiments, and then the wire sample is taken out and scanned electronically The microscope is used to observe the surface morphology, and the observation results are obtained and compared with the clean wires.

Therefore, using the negative pressure simulation test and analysis platform with controllable environmental conditions in the above-mentioned embodiment, it can be realized:

1) In different haze weather and under different haze concentrations, the corona discharge characteristics of the wire are analyzed by detecting the strength of the wire corona discharge;

2) Detect the efficiency and effect of electrostatic precipitator under different particle concentrations and different electrode structures; for the current popular electrostatic precipitator structure, parallel line electrode array, by replacing the electrode in the device with a structure with three parallel wires (or more ), pass in a certain amount of particulate matter, measure the initial concentration, then make the wire electrified and generate corona discharge, after a certain period of time, measure the subsequent concentration, and obtain the efficiency of electrostatic precipitator according to the change of the concentration before and after.

3) Obtain wire samples under different conditions, change and detect the surface state of the wire, and then obtain the surface state of the wire under different conditions.

Since the measurement error is mainly due to the electric field generated by the electric charge accumulated on the inner wall of the deposition chamber, it will interfere with the original electric field distribution in the container, thus causing the error in the measurement of corona characteristics. In this regard, two methods can be used to avoid the effect of accumulating charges: one is passive shielding with corona cages, and the other is adding antistatic coating to the four walls of the deposition chamber.

As an optional implementation, in the above embodiment, the inner wall of the negative pressure deposition chamber 200 is coated with an antistatic coating. In the device of this embodiment, due to the possibility of discharge, there will be A large number of space charges will migrate to the four walls of the device under the action of the electric field, and accumulate on the four walls of the device. However, once such charge accumulation occurs, the electric field distribution in the device will be greatly changed. This is because the accumulated charge will also generate a space electric field, which will be superimposed with the original electric field, thus affecting the accuracy of the relevant measurement results. sex. By introducing an anti-static coating, the electrical conductivity of the coating can quickly introduce the accumulated charges into the ground, which can effectively reduce the accumulation of charges, thereby making the measurement results more accurate.

Optionally, in the above embodiment, the corona cage is provided with a corona cage. The traditional corona cage without protective section will have serious electric field distortion at both ends, and such distortion will bring great errors to the results of the intermediate measurement section. The use of protective sections can effectively smooth and Suppress the electric field distortion at both ends, reduce the influence of this distortion on the middle measurement section, and make the measurement result more accurate. Therefore, by using a corona cage with a protective section and an anti-static coating, the influence of the electric field generated by the accumulated charges on the four walls of the container on the electric field generated by the wires can be shielded, and the influence of the accumulated charges on the deposition chamber wall on the output test can be prevented.

In an optional embodiment, an observation hole 206 is formed on the wall of the deposition chamber, and an ultraviolet camera or a high-speed CCD (Charge Coupled Device) camera is externally connected to the observation hole 206 for observing the inside of the deposition chamber 200 . Corona discharge and particle deposition.

As an optional implementation, in the above embodiment, the negative pressure deposition chamber 200 is configured with a vacuum device 202 for forming a negative pressure in the chamber, so that the airflow simulated by the combustion chamber 100 enters the deposition chamber under the guidance of the negative pressure within 200. In this embodiment, in order to solve the problem of particle transmission, that is, how to transfer the particles in the combustion chamber to the deposition chamber, this embodiment adopts the method of pumping negative pressure, that is, firstly cutting off the connection between the combustion chamber and the deposition chamber, and pumping the air in the deposition chamber. The pressure of the combustion chamber is higher than that of the deposition chamber, and then the combustion chamber and the deposition chamber are connected to achieve the purpose of spreading the particles along the air pressure difference. Therefore, in this embodiment, the particle flow is realized by means of pumping negative pressure, which not only improves the convenience of practical operation, but also avoids an external gas cylinder to guide the particle flow, and simplifies the structure of the device. In addition, this method does not require an external gas cylinder, which improves the safety of the device and the simplicity of the structure.

Optionally, the thickness of the wall of the deposition chamber 200 can be increased to achieve a lower negative pressure, thereby facilitating the guidance of particles and increasing the flow rate.

Here, it should be noted that, for the safety of negative pressure extraction, the present embodiment relates to the extraction air pressure according to the size of the combustion chamber, and conducts a safety analysis during the design process. Examples are as follows:

For the device disclosed in this embodiment, the maximum air extraction volume is the volume of the combustion chamber 100. After calculation, the air equivalent to the volume of the combustion chamber 100 is extracted from the negative pressure deposition chamber 200 to reduce the air pressure in the negative pressure deposition chamber 200 by 10%. % of standard atmospheric pressure. At the same time, in the actual production of the device of this embodiment, the thickness of the four walls can reach 2cm, and each wall is equipped with reinforcing ribs to provide additional support, which can fully withstand the pressure brought by 10% standard atmospheric pressure.

In an optional embodiment, the deposition chamber 200 is provided with a side door 205 of the deposition chamber, and the high-voltage power supply 210 can be disposed through the side door 205 and connected to the conductor sample 212 under test.

As an optional implementation, in the above embodiment, the tested conductor sample 212 is located on the central axis of the corona cage 201 ; both ends of the tested conductor sample 212 are provided with shielding balls 215 , and the shielding balls 215 are connected to the insulating rod 216 , the insulating rod 216 is fixedly connected to the inner wall of the deposition chamber 200 .

As an optional implementation manner, in the above embodiment, the environmental parameter measurement devices include: a thermo-hygrometer 207, a barometer 208, and a concentration meter 209, wherein the thermo-hygrometer 207 is disposed outside the deposition chamber 200 for measuring deposition For the temperature and humidity inside the chamber 200 , a barometer 208 is installed outside the deposition chamber 200 to measure the air pressure inside the deposition chamber, and a concentration meter 209 is installed outside the deposition chamber 200 to measure the concentration of pollutants inside the deposition chamber 200 . It should be noted that, in this embodiment, more data can be obtained by adjusting the data of the measurement ports, increasing the number of test devices, and/or installing them in different positions, thereby improving the accuracy of the data.

As an optional implementation manner, in the above embodiment, the control assembly further includes: a valve, a particle size filter and a tachometer, wherein: the valve is arranged on the communication channel 102 between the combustion chamber 100 and the deposition chamber 200 for controlling Contaminant channel switch. The particle size filter is disposed at the pollutant inlet, and is used to control the particle size of the particles introduced into the negative pressure deposition chamber 200 . The tachometer is arranged on the communication channel between the combustion chamber 100 and the negative pressure deposition chamber 200 to measure the flow rate of pollutants.

In an optional embodiment, filter papers with different properties are installed at the particle inlet, and filter papers with different properties are used as particle size filters, so that the particle size of the particles entering the deposition chamber can be controlled, ensuring that subsequent tests can be based on controllable. The particle size is targeted.

As an optional implementation manner, in the above embodiment, the combustion chamber 100 further includes: a first combustion chamber 100a and a second combustion chamber 100b that are stacked on top of each other. The first combustion chamber 100a communicates with the deposition chamber 200 through the first communication passage 102a, and the second combustion chamber 100b communicates with the deposition chamber 200 through the second communication passage 102b. The first communication channel 102a is provided with a first valve 104a, a first particle size filter and a first velocimeter 103a, and the second communication channel 102b is provided with a second valve 104b, a second particle size filter and a second velocimeter 103b. Based on the design requirements of electrical insulation, in this embodiment, two combustion chambers are arranged to form a larger combustion chamber, so that the existing size is compact and moderate, which is not only conducive to the concentration of suspended particles, but also meets the requirements of electrical insulation, which is conducive to the development of Experimental studies at high voltages can improve the efficiency of environmental simulations.

It should be pointed out that in this embodiment, the size and shape of the combustion chamber and/or the deposition chamber can be adjusted. The number of chambers, the placement of the replacement combustion chamber and the deposition chamber can meet different actual space requirements and test analysis requirements. Therefore, this embodiment describes the positional relationship of each device of the above-mentioned negative pressure simulation test and analysis platform with controllable environmental conditions. And the connection relationship does not limit the uniqueness.

In an optional embodiment, in the above-mentioned embodiment, the position of the air inlet can also be adjusted, and/or the inlet diameter of the communication channel can be increased to achieve greater flow through.

As an optional implementation, the negative pressure simulation test and analysis platform with controllable environmental conditions in the above embodiment may further include: a water-cooled pipe, the water-cooled pipe is arranged outside the communication channel 102 between the combustion chamber 100 and the deposition chamber 200, In addition, the water flow direction in the water cooling channel and the gas flow direction of the communication channel 102 are set in the opposite direction, which helps to reduce the flue gas temperature of the simulated pollutants during transmission, and reduces the influence of the heat release of the combustion chamber 100 on the simulated test.

To sum up, the above-mentioned embodiments are aimed at the problems of the first type of solutions and the second type of solutions in the prior art. By burning, such as burning cigarettes or burning incense tablets, a continuous and sufficient amount of particulate matter is generated, and simulation is used. Modeling analysis is mainly to establish a coaxial cylinder electrode model, determine the electric field strength distribution and size of the cage section and both ends under different cage radii and lengths, and design a more suitable enclosure that meets the electrical insulation conditions. Vessel size to ensure that air gap breakdown does not occur.

6 and 7, the electrode model of the coaxial cylinder is expanded and explained, and the three-dimensional electrode model of the coaxial cylinder is established in a two-dimensional axisymmetric manner. Figures 6 and 7 respectively show the corresponding actual segmented Corona cage structure, where a is the distance from the outer end of the segmented corona cage to the center of the cage body, and b is the distance from the inner end of the segmented corona cage to the center of the cage body:

In Figure 6, a voltage is applied to the wire in the center, and then the electric field distribution is calculated according to different a and b lengths (the xoy coordinate system is established at the center of symmetry), and the changes in the electric field at the ends are analyzed to determine the appropriate cage length. . During the experiment, the maximum voltage is 100kV, while the breakdown field strength of the extremely uneven air gap in engineering is 5kV/cm. The length of the air gap here (ie the cage radius of 0.36m) can withstand the applied voltage of 180kV, thus ensuring no Breakdown of the air gap occurs.

In addition, in view of the problem of the third type of solution in the prior art, the size of the device can be optimized by designing, for example: in an optional embodiment, the length of the corona cage can be 0.78m, and the radius of the cage can be 0.78m. It is 0.36m, which not only ensures the requirements of electrical insulation, but also makes the device volume suitable, thereby realizing the convenience and mobility of operation. According to the size of b.a mentioned above, when b/a is greater than 0.6 and less than 0.8, the protection section can effectively reduce the electric field distortion at the end, so that the electric field variation along the line of section b fluctuates within 0.1%. The actual length of the cage depends on the size of the device itself. If the length, width and height of the device itself are 1m, considering the convenience of wiring and installation, it is recommended to take the length of the cage as 0.78m, and the radius of the cage should be determined according to the extreme unevenness. The breakdown field strength of the air gap is estimated, and the minimum cannot be less than 20cm. In fact, in order to leave a margin for the future experimental voltage and ensure the safety of the experiment to the greatest extent, considering the convenience of wiring and installation, take the cage The body radius is 0.36m.

At the same time, this embodiment also improves the method of transferring the particles in the combustion chamber to the deposition chamber. In order to solve the problem of particle transmission, a negative pressure method is adopted, that is, the connection between the combustion chamber and the deposition chamber is first cut off, and the deposition The air pressure in the chamber is pumped, causing the air pressure in the combustion chamber to be higher than that in the deposition chamber, and then the combustion chamber and the deposition chamber are connected to achieve the purpose of propagating the particles along the air pressure difference. This method does not require an external gas cylinder, which improves the safety of the device and the simplicity of the structure.

The above description is only an embodiment of the present invention, and is not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. within.

Claims (10)

1. a negative pressure simulation test and analysis platform with controllable environmental conditions, is characterized in that, this platform comprises: the simulation device for simulating different environmental conditions and for monitoring the test analysis of tested conductor samples under different simulated environmental conditions device; wherein: A) The simulation device includes: Combustion chambers, which are used to create contaminants that simulate the environment; Negative pressure deposition chamber, with built-in segmented corona cage and tested conductor samples arranged in the corona cage; the negative pressure deposition chamber is used to introduce and make the pollutants in the simulated environment by using the principle of negative pressure deposition on the wire sample under test; a control assembly, arranged on the communication channel between the combustion chamber and the deposition chamber, for controlling and monitoring the size and flow of the simulated pollutants; B) The test and analysis device includes: an environmental parameter measuring device, connected to the deposition chamber, for measuring the simulated environmental parameters in the deposition chamber; a monitoring device for monitoring the morphology data of the conductor sample and the related data of the corona discharge effect; The data analysis platform is used to analyze the data related to the corona discharge effect and output the analysis results. 2. The negative pressure simulation test and analysis platform with controllable environmental conditions according to claim 1, wherein the monitoring device further comprises: The nanovoltmeter is provided with an ion flow plate, and the ion flow plate is arranged on the outside of the corona cage for measuring the ion flow density; Field grinding, which is provided with a field grinding probe, and the field grinding probe is arranged on the outside of the corona cage and is used to measure the synthetic electric field; High-voltage power supply to supply power to the conductor sample under test; A corona current measuring device, connected to the tested conductor sample, is used for measuring the corona current data of the tested conductor sample. 3. The negative pressure simulation test and analysis platform with controllable environmental conditions according to claim 2, wherein the corona current measuring device further comprises: Measuring capacitance, connecting with the tested conductor sample for voltage division; a sampling resistor, connected with the measuring capacitor, for converting the corona current signal generated by the corona discharge into a voltage signal; The acquisition card is connected with the measuring capacitor and the sampling resistor respectively, and is used for measuring the corona current data generated by the tested conductor sample and receiving the voltage signal. 4. The negative pressure simulation test analysis platform with controllable environmental conditions according to claim 3, wherein the data analysis platform comprises: a corona identification module, used for determining whether corona discharge occurs according to various effects of corona discharge measured by the monitoring device; The corona analysis module is used to define the corona discharge intensity according to the pulse intensity and frequency of the corona current monitored when it is determined that the corona discharge occurs, so as to realize the detection and analysis of the discharge effect under different conditions; The surface state analysis module is used to establish the corresponding relationship between the corona discharge intensity and the surface morphology state of the wire sample according to the obtained conductor sample morphology data corresponding to different corona discharge data, and to analyze and obtain the conductor surface contamination on the electrical conductivity. Effects of corona current pulses. 5. The negative pressure simulation test and analysis platform with controllable environmental conditions according to claim 4, is characterized in that: The inner wall of the negative pressure deposition chamber is coated with an anti-static coating, and an observation hole is provided on the wall body. An external ultraviolet camera or a high-speed charge-coupled device CCD camera is connected to the observation hole for observing the corona in the deposition chamber. Discharge and particle deposition conditions; and/or, The negative pressure deposition chamber is equipped with a vacuum device for forming a negative pressure in the chamber, so that the airflow simulated by the combustion chamber enters the deposition chamber under the guidance of the negative pressure; the deposition chamber is provided with a side door, and the high-voltage power supply Pass through the side door and the door body is connected to the tested conductor sample. 6. The negative pressure simulation test and analysis platform with controllable environmental conditions according to claim 4, wherein the tested conductor sample is located on the central axis of the corona cage; The end is provided with a shielding ball, the shielding ball is connected to an insulating rod, and the insulating rod is fixedly connected to the inner wall of the deposition chamber. 7. The negative pressure simulation test and analysis platform with controllable environmental conditions according to claim 4, wherein the environmental parameter measurement device comprises: a concentration meter, arranged on the outside of the deposition chamber, for measuring the concentration of pollutants inside the deposition chamber; an air pressure gauge, arranged outside the deposition chamber, for measuring the air pressure inside the deposition chamber; A thermo-hygrometer, disposed outside the deposition chamber, is used to measure the temperature and humidity inside the deposition chamber. 8. The negative pressure simulation test and analysis platform with controllable environmental conditions according to any one of claims 1 to 7, wherein the control assembly further comprises: a valve, arranged on the communication channel between the combustion chamber and the deposition chamber, for controlling the opening and closing of the pollutant channel; A particle size filter, arranged at the pollutant inlet, used to control the particle size of the particles passed into the negative pressure deposition chamber; A tachometer is arranged on the communication channel between the combustion chamber and the negative pressure deposition chamber, and is used for measuring the flow rate of the pollutants. 9 . The negative pressure simulation test and analysis platform with controllable environmental conditions according to claim 8 , wherein the combustion chamber further comprises: a first combustion chamber and a second combustion chamber that are stacked on top of one another; 10 . the first combustion chamber communicates with the deposition chamber through a first communication channel; the second combustion chamber communicates with the deposition chamber through a second communication channel; The first communication channel is provided with a first valve, a first particle size filter and a first tachometer, and the second communication channel is provided with a second valve, a second particle size filter and a second tachometer. 10. The negative pressure simulation test and analysis platform with controllable environmental conditions according to claim 8, wherein the platform further comprises: A water-cooling pipe is arranged on the outside of the communication channel between the combustion chamber and the deposition chamber, and the water flow direction in the water-cooling channel is arranged in the opposite direction to the gas flow direction of the communication channel, so as to reduce the flue gas temperature of simulated pollutants and the effect of the heat release of the combustion chamber on the simulated test.

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