CN109283440B - Negative pressure type simulation test analysis platform with controllable environmental conditions - Google Patents
Negative pressure type simulation test analysis platform with controllable environmental conditions Download PDFInfo
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- CN109283440B CN109283440B CN201811088142.2A CN201811088142A CN109283440B CN 109283440 B CN109283440 B CN 109283440B CN 201811088142 A CN201811088142 A CN 201811088142A CN 109283440 B CN109283440 B CN 109283440B
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- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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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
Technical Field
The invention relates to the technical field of power transmission, in particular to a negative pressure type simulation test analysis platform with controllable environmental conditions.
Background
In recent years, the air pollution is more serious, and the transmission line is directly influenced by the atmospheric environment in the long-term operation process. When high tension transmission line exposes for a long time in the atmospheric environment that has airborne particulate matter, the particulate matter can adhere to the wire surface and form the long-pending dirt, changes wire surface characteristic, and then influences the corona characteristic of wire for transmission line's electromagnetic environment is more complicated.
Along with the aggravation of the severe degree of the environment, the pollution particles in the environment are attached to the surface of the wire, so that the problems of corona voltage reduction, corona loss increase and the like are caused, and the safe operation of the power transmission line is also damaged. Therefore, there is an increasing interest in the analytical testing and subsequent investigation of the corona effect of the wire after deposition of particulate matter, which mainly includes particulate matter generation, particulate matter transport, particulate matter accumulation in a closed container (closed container holding electrodes) followed by relevant testing in the container or subsequent investigation of samples taken. Generally, the relevant tests performed refer to tests on the corona effect of the wire after deposition of the particulate matter, mainly testing the corona discharge onset voltage, the resultant electric field at the cage, the ion current density at the cage and the corona current pulses generated by the corona discharge. Subsequent studies, which will be described herein, refer to scanning electron microscopy of surface topography and spectroscopy of surface composition on wire samples with particulate matter deposited thereon.
At present, the inventor of the present application has learned through a great deal of research and study that there are three types of platforms in the industry:
1. platform of the first kind
Produce the particulate matter through aerosol generator system, realize the particulate matter from pipeline transportation to test in the pipe socket through external gas cylinder.
However, the inventor of the present application found that this solution results in a smaller volume of the closed container to maintain a certain concentration due to a too small amount of particles generated by the aerosol generator, and the smaller closed container has a size (especially, the distance between the high voltage electrode and the four walls of the container) that cannot satisfy the electrical insulation design under a high voltage, specifically, a penetration prevention design that cannot satisfy an air gap, and easily causes the breakdown of the electrode and the air gap of the four walls of the container when the test voltage is not enough, so that the relevant test under a high voltage, mainly the test of the corona discharge starting voltage, the resultant electric field at the cage, the ion current density at the cage, and the corona current pulse generated by the corona discharge, cannot be performed.
2. Platform of the second kind
Generating particles through a combustion or atomizer, and spraying the particles into a large closed container through a pipeline for relevant tests; however, in order to satisfy the electrical insulation design, the volume of the container is large, which easily causes the concentration and uniformity of the particles in the container to be difficult to control and adjust, and because the concentration of the particles is difficult to control and adjust for the corona discharge characteristics of the conducting wires (mainly including corona onset voltage, resultant electric field, ion current density and corona current) when the particles are uniformly distributed through the quantitative analysis of the device, if the uniformity and the quantitative adjustment of the particles in the container cannot be well controlled, the subsequent quantitative analysis is difficult to perform.
In addition, the inventors of the present application have also found that there is a problem with both the first and second categories of solutions: the free charges generated by the discharge can be accumulated on the four walls of the closed container, so that errors of the corona discharge effect test can be caused, wherein the errors are mainly caused because the charges accumulated on the four walls can generate an electric field, so that the original electric field distribution in the container is interfered, and errors of the corona characteristic measurement are caused. In this respect, the design adopts two ways to avoid the influence of accumulated charges, one is to adopt the corona cage to shield passively, and the other is to add the antistatic coating on the four walls of the deposition chamber.
3. Platform of the third kind
The particles are taken as a particle generating device by a jet mill and then diffused to a larger climate chamber for testing; however, this type of solution uses jet mills and large climatic chambers, both of which are too bulky, not conducive to the convenience of the development of experiments and tests, and not mobile, and the jet mills are expensive to use since they are generally more than ten thousand dollars in price.
Meanwhile, the inventors of the present application have found through extensive investigations that: none of the three designs can control the particle size, which is important for testing the corona effect of the wire after the particles are deposited.
Disclosure of Invention
In view of this, in order to solve the above technical problems, an embodiment of the present invention provides a negative pressure type simulation test analysis platform with controllable environmental conditions, which can realize controllable simulation environment and perform detection and analysis on the surface morphology of a wire, the electric precipitation and the corona discharge under different simulation conditions.
In order to solve the above technical problem, the embodiments of the present invention disclose the following technical solutions, including:
in one embodiment of the present invention, a negative pressure type simulation test analysis platform with controllable environmental conditions is disclosed, the platform comprising: 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; wherein:
A) the simulation apparatus includes:
a combustion chamber for creating pollutants for a simulated environment;
the device comprises a negative pressure deposition chamber, a first electrode, a second electrode, a third electrode and a fourth electrode, wherein a segmented corona cage and a conductor sample to be tested are arranged in the negative pressure deposition chamber; the negative pressure deposition chamber is used for introducing pollutants simulating the environment by using a negative pressure principle and depositing the pollutants on a tested lead sample;
the control assembly is arranged on a communication channel between the combustion chamber and the deposition chamber and is used for controlling and monitoring the size and the flow of the simulated pollutants;
B) the test analysis device includes:
the environment parameter measuring device is connected with the deposition chamber and is used for measuring the simulated environment parameters in the deposition chamber;
the monitoring device is used for monitoring the appearance data of the conductor sample and the relevant data of the corona discharge effect of the conductor sample;
and the data analysis platform is used for analyzing the related data of the corona discharge effect and outputting an analysis result.
In an optional embodiment, the monitoring device further comprises:
the nano-volt meter is provided with an ion flow plate, and the ion flow plate is arranged on the outer side of the corona cage and used for measuring the ion current density;
the field mill is provided with a field mill probe, and the field mill probe is arranged on the outer side of the corona cage and used for measuring a synthesized electric field;
the high-voltage power supply supplies power to the conductor sample to be tested;
and the corona current measuring device is connected with the conductor sample to be measured and is used for measuring corona current data of the conductor sample to be measured.
As an optional embodiment, the corona current measuring device further comprises:
the measuring capacitor is connected with the conductor sample to be measured and used for voltage division;
the sampling resistor is connected with the measuring capacitor and is used for converting a corona current signal generated by corona discharge into a voltage signal;
and the acquisition card is respectively connected with the measuring capacitor and the sampling resistor and is used for measuring corona current data generated by the conductor sample to be detected and receiving a voltage signal.
Optionally, based on any one of the above embodiments, the data analysis platform includes:
the corona identification module is used for judging whether corona discharge occurs or not according to various effects of corona discharge measured by the data measuring device;
the corona analysis module is used for defining the corona discharge intensity according to the pulse intensity and the frequency of the monitored corona current when the corona discharge is judged to occur, and realizing the detection and analysis of the discharge effect under different conditions;
and the surface state analysis module is used for establishing the corresponding relation between the corona discharge intensity and the surface topography state of the wire sample according to conductor sample topography data corresponding to the acquired different corona discharge data, and analyzing the influence of the obtained conductor surface area dirt on the corona current pulse.
Optionally, based on any of the above embodiments, the inner wall of the negative pressure deposition chamber is coated with an anti-static coating, the wall body is provided with an observation hole, and an ultraviolet camera or a high-speed CCD (charge coupled device) camera externally connected to the observation hole is used for observing corona discharge and particle deposition conditions in the deposition chamber.
Optionally, according to 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 particulate matter gas flow 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 is arranged on the side door body in a penetrating way and is connected with the detected conductor sample.
Optionally, in accordance with any of the above embodiments, the conductor sample under test is located at a central axis of the corona cage; and shielding balls are arranged at two ends of the tested conductor sample, the shielding balls are connected to the insulating rod, and the insulating rod is fixedly connected to the inner wall of the deposition chamber.
Optionally, based on any one of the above embodiments, the environment parameter measuring device includes:
the concentration meter is arranged outside the deposition chamber and used for measuring the concentration of pollutants inside the deposition chamber;
the barometer is arranged outside the deposition chamber and used for measuring the air pressure inside the deposition chamber;
and the hygrothermograph is arranged outside the deposition chamber and is used for measuring the temperature and the humidity inside the deposition chamber.
Optionally, based on any one of the above embodiments, the control assembly further includes:
the valve is arranged on a communication channel between the combustion chamber and the deposition chamber and is used for controlling the opening and closing of a pollutant channel;
the particle size filter is arranged at the pollutant inlet and used for controlling the particle size of particles introduced into the negative pressure deposition chamber;
and the tachometer is arranged on a communication channel between the combustion chamber and the negative pressure deposition chamber and is used for measuring the flow of the pollutants.
Optionally, according to any one of the above embodiments, the combustion chamber further includes: a first combustion chamber and a second combustion chamber which are stacked up and down;
the first combustion chamber and the second combustion chamber are respectively communicated with the deposition chamber through a first communication channel and a second communication channel;
the first communicating channel is provided with a first valve, a first particle size filter and a first speedometer, and the second communicating channel is provided with a second valve, a second particle size filter and a second speedometer.
Optionally, based on any one of the above embodiments, the negative pressure type simulation test analysis platform with controllable environmental conditions may further include:
the water-cooling pipeline, set up in the combustion chamber with the intercommunication passageway outside of deposit room, just rivers direction in the water-cooling passageway with the gas flow direction of intercommunication passageway is reverse to be set up to be used for reducing the flue gas temperature of simulation pollutant and the influence of the exothermal to simulation test of combustion chamber.
Compared with the prior art, the technical scheme disclosed by the embodiment of the invention has the following advantages:
after the technical scheme of the embodiment of the invention is adopted, simulation modeling analysis is utilized, a coaxial cylindrical electrode model is mainly established, and a simulation device and an analysis device which can realize the simulation of environmental conditions and the controllable pollution deposition process are designed by combining a negative pressure principle, so that the operation convenience and the mobility are realized, the integration of corona discharge characteristic test is also realized, the convenience and the mobility of a set of equipment are facilitated, the various effects of corona discharge can be conveniently tested, and the detection and the analysis of the discharge effect under different conditions are realized.
Therefore, the simulation analysis test system disclosed by the embodiment of the invention can detect the corona discharge strength of the wire under the condition of different haze concentrations, can also detect the electric precipitation efficiency under the conditions of different particulate matter concentrations and different electrode structures, and can obtain wire samples under different conditions so as to obtain the surface state condition of the wire.
Further features and advantages of embodiments of the present invention will be described in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the invention, are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic composition diagram of a negative pressure type simulation test analysis platform with controllable environmental conditions according to an embodiment of the present invention;
fig. 2 is a schematic composition diagram of another negative pressure type simulation test analysis platform with controllable environmental conditions according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a data monitoring process of a negative pressure type simulation test analysis platform with controllable environmental conditions according to an embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating a corresponding relationship between input and output of a data monitoring object according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a data analysis process disclosed in an embodiment of the present invention;
FIG. 6 is a schematic cross-sectional view of a segmented corona cage in a negative pressure type simulation test analysis platform with controllable environmental conditions according to an embodiment of the present invention; and
fig. 7 is a schematic longitudinal sectional view of a segmented corona cage in a negative pressure type simulation test analysis platform with controllable environmental conditions according to an embodiment of the present invention.
Description of the 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 communicating channel
102a first communication path
102b second communication passage
103a first speedometer
103b second speedometer
104a first valve
104b second valve
200 deposition chamber
201 sectional type corona cage
202 vacuum pumping device
203 nano volt meter
204 field mill
205 side door of deposition chamber
206 observation hole
207 hygrothermograph
208 barometer
209 concentration meter
210 high voltage power supply
211 corona cage support
212 conductor sample
213 ion flow plate
214 field grinding probe
215 shielding ball
216 insulating rod
300 test analysis device
301 measuring capacitance
302 sampling resistor
303 acquisition card
304 data analysis platform
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the features of the embodiments and examples of the present invention may be combined with each other without conflict.
Embodiments of the invention are further described below with reference to the following drawings:
the invention designs a negative pressure type simulation test analysis platform with controllable environmental conditions, which is used for the accumulation simulation of particulate matters with controllable environmental conditions to carry out corona discharge test, and the negative pressure type simulation test analysis platform with controllable environmental conditions provided by the invention is further explained by combining with the embodiment:
this controllable negative pressure formula simulation test analysis platform of environmental condition includes: 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.
In this embodiment, as shown in fig. 1, the simulation apparatus further includes: combustion chamber 100, negative pressure deposition chamber 200 and control assembly, wherein: the combustion chamber 100 is used for producing pollutants simulating the environment, and the negative pressure deposition chamber 200 is internally provided with a segmented corona cage 201 and a tested conductor sample 212 arranged in the corona cage 201. The negative pressure deposition chamber 200 is used for introducing the pollutants simulating the environment by using the negative pressure principle and depositing the pollutants on the tested lead wire sample 212. The control assembly is arranged on a communication channel 102 of the combustion chamber 100 and the negative pressure deposition chamber 200 and is used for controlling and monitoring the size and the flow of the simulated environmental particle pollutants.
In this embodiment, as shown in fig. 1, the test analysis apparatus 300 further includes: environmental parameter measuring device, monitoring devices and data analysis platform. Wherein: the environmental parameter measuring device is connected with the negative pressure deposition chamber 200 and is used for measuring the simulated environmental parameters in the deposition chamber 200. The monitoring device is used for monitoring the topographic data of the conductor sample 212 and relevant data of the corona discharge effect of the conductor sample. And the data analysis platform is used for analyzing the related data of the corona discharge effect and outputting an analysis result.
In this embodiment, controllable negative pressure formula simulation test analysis platform of environmental condition is used for studying the influence of different simulated environment to surface deposition particulate matter wire corona discharge characteristic, can realize testing synthetic electric field, ion current density, corona current, concentration variation and surface state under different environmental condition and the structure, to different demands, adjusts the different test object of adaptation.
As an alternative implementation, as shown in fig. 2, the monitoring device in the above embodiment further includes: a nano-volt meter 203 and an ion flow plate 213, a field mill 204 and a probe 214 thereof, a corona current measuring device and a high voltage power supply 210, wherein: the nanovoltmeter 203 is provided with an ion current plate 213, and the ion current plate 213 is provided outside the corona cage 201 for measuring ion current density. The field mill 204 is provided with a field mill probe 214, the field mill probe 214 being provided outside the segmented corona cage 201 for measuring the resultant electric field. The high voltage power supply 210 supplies power to the tested conductor sample 212, adopts a cable leading-in mode, and utilizes the insulating layer of the high voltage cable to realize the purpose of insulation, thereby avoiding the problem that when the high voltage is led into a small space which needs good air tightness, the high voltage is easy to cause discharge near an interface and even cause breakdown. The corona current measuring device is connected with the tested conductor sample 212 and is used for measuring corona current data of the tested conductor sample 212.
It should be noted that the corona current measuring device can be changed into a high-voltage end measurement to improve the measurement accuracy, for example: by canceling the voltage-dividing capacitor, the measuring equipment is placed and directly connected with the wire, the measuring part is placed in the Faraday cage, and the electro-optic converter which are connected through the optical fiber transmit measuring data to the computer, so that the high-voltage end measurement is realized, the interference of the voltage-dividing capacitor on current signals is eliminated, and the measuring precision is improved.
In addition, the design of electric high-voltage insulation is carried out according to the sizes of the deposition chamber and the corona cage, for example, the radial size of the corona cage in the embodiment can ensure that no air gap breakdown occurs under the action of the highest applied voltage; for another example, the length of the guard segment used in the present embodiment can minimize the distortion effect of the electric field at the end portion.
As an alternative implementation, as shown in fig. 2, the corona current measuring device in the above embodiment further includes: measuring capacitor 301, sampling resistor 302 and acquisition card 303, wherein:
the measuring capacitor 301 is connected with the measured conductor sample 212 and used for dividing voltage and providing proper voltage for the equipment at the measuring section;
the sampling resistor 302 is connected with the measuring capacitor 301 and is used for converting a current signal into a voltage signal so as to facilitate the acquisition of data by an acquisition card;
the acquisition card 303 is connected to the measurement capacitor 301 and the sampling resistor 302, respectively, and is configured to measure corona current data generated by the conductor sample 212 to be measured and receive a voltage signal.
Here, the working procedure of the simulation test analysis in the above embodiment is illustrated with reference to fig. 3 and the following example:
s1: closing the deposition chamber, closing a valve on a communication channel between the combustion chamber and the deposition chamber, and cutting off the communication between the combustion chamber and the deposition chamber;
s2: starting a negative pressure pumping device to pump negative pressure to the deposition chamber, and adjusting the temperature in the deposition chamber through a configured heater;
s3: burning incense in the combustion chamber to generate particles;
s4: opening a valve on a communication channel between the combustion chamber and the deposition chamber, and introducing particles into the deposition chamber;
s5: and (5) waiting for the particulate matters to be uniformly diffused, and finishing the particulate matters accumulation for a certain time.
S6: relevant corona discharge characteristics such as a synthetic electric field, ion current density and corona current are measured through the monitoring device, and measured data are analyzed through the data analysis platform to obtain the influence of a corresponding simulation environment on the corona discharge characteristics of the surface deposition particulate matter conducting wire.
As an optional implementation manner, the data analysis platform in the foregoing embodiment further includes: corona identification module, corona analysis module and surface condition analysis module, wherein: the corona identification module is used for judging whether corona discharge occurs according to various effects of the corona discharge measured by the data measuring device. And the corona analysis module is used for defining the corona discharge intensity according to the pulse intensity and the frequency of the monitored corona current when the corona discharge is judged to occur, so that the discharge effect under different conditions can be detected and analyzed. The surface state analysis module is used for establishing a corresponding relation between the corona discharge intensity and the surface shape state of the lead sample according to the conductor sample shape data corresponding to the obtained different corona discharge data, and analyzing to obtain the influence of the surface dirt of the conductor on the corona current pulse.
Here, with reference to fig. 4 and fig. 5, a data analysis process of the negative pressure type simulation test analysis platform with controllable environmental conditions according to the above 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 a corona current generated by the wire due to corona discharge, a current flowing through the wire, a loop formed by an air gap between the wire and the ground. This embodiment designs a convenient device integrates of corona discharge characteristic test, main corona characteristic test content, including synthetic electric field, ion current density, corona current measurement, its relevant interface is fixed at the wall of device with the mode of wiring plug, and its relevant measuring equipment includes electric field tester, the equal fixed mounting such as nanovolt table in the device, and then realizes integrating with convenient, is favorable to testing corona discharge's multiple effect, realizes the detection and the analysis to the effect of discharging under the different conditions.
In this embodiment, by monitoring this current and performing data processing, the following objectives can be achieved:
1) whether corona current pulse occurs or not is monitored, whether corona discharge occurs or not is judged, and the gathering condition of particles on the surface of the conductor is different before and after the corona discharge, so that whether the corona discharge occurs or not can be detected effectively, and the correlation between the surface contamination of the conductor and the corona current pulse is very important to be analyzed accurately.
2) After the corona current pulse is detected, the intensity of corona discharge, such as weak corona, moderate corona, severe corona and the like, can be quantitatively defined according to the intensity and frequency of the corona current pulse, so that the fouling wire samples under different corona discharge intensities can be obtained, and the corona discharge intensity and the surface morphology of the wire are related.
3) Meanwhile, the influence of the dirt accumulation on the corona current pulse, namely the corona discharge effect, can be researched by analyzing the conditions of the strength and the frequency of the corona current pulse.
Here, the negative pressure type simulation test analysis platform with controllable environmental conditions disclosed in the above embodiments is used to exemplify specific applications in combination with the following scenarios:
1) by adopting the negative pressure type simulation test analysis platform with controllable environmental conditions, the influence of certain simulated environmental conditions (such as certain temperature and humidity) on the corona characteristic of the wire under the particulate matter condition can be researched: the temperature and humidity in the deposition chamber are adjusted, particles with certain concentration are introduced, and then the corona discharge characteristic of the wire is detected.
2) The negative pressure type simulation test analysis platform with controllable environmental conditions of the embodiment can be used for researching the influence of certain simulated environmental conditions (such as certain temperature and humidity) on the corona characteristics of needle electrode discharge in a needle plate electrode under the condition of particulate matters: the process is further explained by adjusting the temperature and humidity in the deposition chamber, introducing particles with certain concentration and then detecting the corona discharge characteristic of the needle electrode as follows: the electrode type in the device is changed according to the electrode structure, so that the needle plate electrode is firstly changed into the device; adjusting the temperature in the device to the temperature required by the experiment through a heater or dry ice according to the object to be researched, such as the influence of the temperature; then introducing particles and adjusting the concentration of the particles; then, measuring various corona discharge characteristics in the pin plate electrode at the current temperature, wherein the characteristics comprise a synthetic electric field, ion current density and corona current; and repeatedly adjusting the temperature and the concentration of the particles, repeatedly measuring, and finally obtaining the change condition of the temperature of each corona discharge characteristic under different concentrations of the particles to obtain the final influence rule.
3) The influence of environmental conditions (temperature and humidity) on the pollution characteristics of the fouling insulator string under the particulate matter condition is researched: the pollution characteristics are detected by adjusting the temperature and humidity in the deposition chamber and introducing particles with certain concentration.
4) The effect of environmental conditions (temperature and humidity) on the wire corona characteristics under particulate conditions was studied: the temperature and humidity in the deposition chamber are adjusted, particles with certain concentration are introduced, and then the corona discharge characteristic of the wire is detected.
5) Study on how particulate matter deposition changes the surface morphology of the wire at different voltages: through adjusting the voltage that the wire takes, let in the particulate matter of certain concentration, carry out the particulate matter deposition experiment, take out the wire sample afterwards, carry out the observation of surface morphology through the electron scanning microscope, obtain the observation result and compare with clean wire.
6) Study on how particulate matter deposition changes the wire surface topography under different environmental conditions (temperature and humidity): through adjusting the humiture in the deposit room, let in the particulate matter of certain concentration, carry out the particulate matter deposit experiment, take out the wire sample afterwards, carry out the observation of surface morphology through the electron scanning microscope, obtain the observation result and compare with clean wire.
Therefore, the negative pressure type simulation test analysis platform with controllable environmental conditions in the embodiment can be adopted to realize that:
1) under the conditions of detecting different haze concentrations in different haze weathers, the corona discharge characteristic of the lead is analyzed by detecting the intensity of the corona discharge of the lead;
2) detecting the efficiency and effect of electric precipitation under the conditions of different particle concentrations and different electrode structures; to present popular electric precipitation structure, parallel line electrode array, through the electrode change in with the device for three wire parallel structure (or more), let in a certain amount of particulate matter, measure the initial concentration, make the wire electrified and take place corona discharge after then, treat after the certain time, concentration after the measurement, according to the change of concentration around to obtain the efficiency of electrostatic precipitation.
3) And obtaining lead samples under different conditions, and changing and detecting the surface state of the lead so as to obtain the surface state conditions of the lead under different conditions.
The measurement error is mainly caused by the fact that the electric field generated by the charges accumulated on the inner wall of the deposition chamber interferes with the original electric field distribution in the container, and therefore the measurement error of the corona characteristic is caused. In this regard, the effects of accumulated charge can be avoided in two ways: firstly, a corona cage is adopted for passive shielding, and secondly, antistatic coatings are added on the four walls of a deposition chamber.
In the above embodiment, the inner wall of the negative pressure deposition chamber 200 is coated with the antistatic coating, and in the apparatus of the present embodiment, a large amount of space charges may exist in the space due to the possibility of discharge, and under the action of the electric field, the charges migrate to and accumulate on the four walls of the apparatus. However, once such charge accumulation occurs, the electric field distribution in the device will be greatly changed, because the accumulated charge will also generate a spatial electric field, which will be superimposed with the original electric field, thereby affecting the accuracy of the related measurement result. Through introducing the antistatic coating, because the electric conductivity of coating can be fast with the leading-in earth of accumulation electric charge, can effectual reduction electric charge's accumulation to make the measuring result more accurate.
Optionally, in the above embodiment, the corona cage is provided with a corona cage. Traditional corona cage without protection section can take place serious electric field distortion at its both ends, and such distortion can bring very big error for the result of middle measurement section, and the use of protection section can be effectual level and smooth and restrain the electric field distortion at both ends, reduces the influence of this kind of distortion to middle measurement section for measuring result is more accurate. Therefore, by using the corona cage with the protective section and the antistatic coating, the influence of an electric field generated by the accumulated charges on the four walls of the container on an electric field generated by the lead can be shielded, and the influence of the accumulated charges on the inner wall of the deposition chamber on an output test can be prevented.
In an alternative embodiment, the wall of the deposition chamber is provided with a viewing hole 206, and an ultraviolet camera or a high-speed CCD (Charge Coupled Device) camera is disposed outside the viewing hole 206 for observing the corona discharge and particle deposition in the deposition chamber 200.
In an alternative embodiment, the vacuum deposition chamber 200 is provided with a vacuum 202 for creating a negative pressure in the chamber, so that the particle flow simulated by the combustion chamber 100 enters the deposition chamber 200 under the guidance of the negative pressure. In this embodiment, in order to solve the particle transmission problem, that is, how to transfer the particles in the combustion chamber into the deposition chamber, the embodiment adopts a negative pressure pumping manner, that is, the connection between the combustion chamber and the deposition chamber is firstly cut off, and air pressure is pumped in the deposition chamber, so that the air pressure in the combustion chamber is higher than that in the deposition chamber, and then the combustion chamber and the deposition chamber are communicated, so as to achieve the purpose that the particles are spread along the air pressure difference. Therefore, this embodiment realizes the particulate matter drainage through the mode that adopts the negative pressure of taking out, has not only improved actual operation's convenience, still can avoid external gas cylinder guide granule to flow, has simplified the structure of device. In addition, the mode does not need an external gas cylinder, and the safety of the device and the simplicity of the structure are improved.
Alternatively, a lower negative pressure may be achieved by increasing the wall thickness of the deposition chamber 200, thereby facilitating particle guidance and increasing the flow rate.
Here, it should be noted that, regarding the safety of the negative pressure extraction, the present embodiment relates to the extraction air pressure according to the size of the combustion chamber, and the safety analysis is performed in the design process, for example, as follows:
for the apparatus disclosed in this embodiment, the maximum pumping amount is the volume of the combustion chamber 100, and the air pressure in the negative pressure deposition chamber 200 is reduced by 10% of the standard atmospheric pressure by calculating the pumping amount of air equivalent to the volume of the combustion chamber 100 from the negative pressure deposition chamber 200. Meanwhile, when the device of the embodiment is actually manufactured, the thickness of the four walls can reach 2cm, and reinforcing ribs are arranged on all the wall surfaces to provide extra support, so that the device can completely bear the pressure brought by 10% of standard atmospheric pressure.
In an alternative embodiment, the deposition chamber 200 is provided with a deposition chamber side door 205, and a high voltage power source 210 can be disposed through the side door 205 and connected to the conductor sample 212 to be tested.
In an alternative embodiment, in the above embodiment, the conductor sample 212 to be tested is located at the central axis of the corona cage 201; the two ends of the tested conductor sample 212 are provided with shielding balls 215, the shielding balls 215 are connected to an insulating rod 216, and 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 environment parameter measuring device includes: hygrothermograph 207, barometer 208 and concentration meter 209, wherein: the thermo-hygrometer 207 is disposed outside the deposition chamber 200 for measuring the temperature and humidity inside the deposition chamber 200, the barometer 208 is disposed outside the deposition chamber 200 for measuring the pressure inside the deposition chamber, and the concentration meter 209 is disposed outside the deposition chamber 200 for measuring the concentration of contaminants inside the deposition chamber 200. It should be noted that, the present embodiment can obtain more data and improve the accuracy of the data by adjusting the data of the measurement port, increasing the number of the test devices, and/or installing the test devices at different positions.
As an optional implementation manner, in the above embodiment, the control component further includes: valve, particle size filter and tachymeter, wherein: the valve is arranged on a communication channel 102 of the combustion chamber 100 and the deposition chamber 200 and is used for controlling the opening and closing of the pollutant channel. The particle size filter is arranged at the pollutant inlet and is used for controlling the particle size of particles introduced into the negative pressure deposition chamber 200. The tachometer is arranged on a communication channel between the combustion chamber 100 and the negative pressure deposition chamber 200 and is used for measuring the flow of pollutants.
In an optional embodiment, filter paper with different properties is installed at the particle inlet, and the filter paper with different properties is used as a particle size filter, so that the particle size of particles introduced into the deposition chamber is controllable, and the subsequent test can be carried out in a targeted manner based on the controllable particle size.
As an alternative implementation, in the above embodiment, the combustion chamber 100 further includes: a first combustion chamber 100a and a second combustion chamber 100b which are stacked one on another. The first combustion chamber 100a communicates with the deposition chamber 200 through a first communication passage 102a, and the second combustion chamber 100b communicates with the deposition chamber 200 through a second communication passage 102 b. The first communicating channel 102a is provided with a first valve 104a, a first particle size filter and a first speedometer 103a, and the second communicating channel 102b is provided with a second valve 104b, a second particle size filter and a second speedometer 103 b. This embodiment is based on electrical insulation's design requirement, through setting up two combustion chambers, forms a great combustion chamber for current size is compact moderate, not only is favorable to concentrating and contains the suspended particles, accords with electrical insulation's requirement moreover, is favorable to developing the experimental study under the high voltage, can improve environmental simulation's efficiency.
It should be noted that, in this embodiment, the size and the shape of the combustion chamber and/or the deposition chamber may be adjusted, and optionally, the embodiment may further implement different actual space requirements and test analysis requirements by modifying or adjusting the positional relationship between the apparatuses in the system, for example, by changing the number of the combustion chambers, and replacing the arrangement of the combustion chambers and the deposition chambers, so that the embodiment does not make a unique limitation on the positional relationship and the connection relationship of each apparatus of the negative pressure simulation test analysis platform with controllable environmental conditions.
In an alternative embodiment, the above embodiment may also achieve a larger through-flow by adjusting the position of the air inlet and/or increasing the inlet caliber of the communication channel.
As an optional implementation manner, the negative pressure type simulation test analysis platform with controllable environmental conditions in the foregoing embodiment may further include: the water-cooling pipeline is arranged outside the communication channel 102 of the combustion chamber 100 and the deposition chamber 200, and the water flow direction in the water-cooling channel and the gas flow direction of the communication channel 102 are reversely arranged, so that the flue gas temperature of simulated pollutants in transmission is reduced, and the influence of heat release of the combustion chamber 100 on simulation test is reduced.
In summary, the above embodiments are directed to the problems of the first and second schemes in the prior art, and generate a sufficient amount of continuous particles by burning, for example, burning cigarettes or burning incense pieces, and utilize simulation modeling analysis, mainly establish a coaxial cylindrical electrode model, determine the distribution and size of electric field intensity at the cross section and both ends of a cage body under different cage body radiuses and lengths, and design a suitable closed container size under the condition of satisfying the electrical insulation condition, so as to ensure that the breakdown of an air gap does not occur.
In the following, with reference to fig. 6 and 7, a coaxial cylindrical electrode model is developed and explained, and a coaxial cylindrical three-dimensional electrode model is established in a two-dimensional axisymmetric manner, where fig. 6 and 7 respectively show a corresponding actual segmented corona cage structure, where a is a distance from an outer end of the segmented corona cage to a center of the cage, and b is a distance from an inner end of the segmented corona cage to the center of the cage:
in fig. 6, a voltage is applied to the central wire, then the electric field distribution is calculated according to different a and b lengths (the xoy coordinate system is established at the symmetrical center), and the variation of the electric field at the end part is analyzed to determine the proper cage body length. In the experiment, the highest voltage is 100kV, the breakdown field strength of the engineering extremely-uneven air gap is 5kV/cm, and the length of the air gap (namely the radius of the cage body is 0.36m) can bear the applied voltage of 180kV, so that the breakdown of the air gap can be ensured not to occur.
In addition, the problem of the third type of solution in the prior art can be solved by optimally designing the size of the device, such as: in an alternative embodiment, the length of the corona cage body can be 0.78m, and the radius of the corona cage body can be 0.36m, so that the requirement of electrical insulation is ensured, the device is appropriate in size, and convenience and mobility of operation are further realized. According to the size of b.a mentioned above, when b/a satisfies more than 0.6 and less than 0.8, the protective segment can effectively reduce the distortion of the end electric field, so that the electric field variation along the line of the b segment fluctuates within 0.1%. The actual length of the cage depends on the size of the device, if the length, width and height of the device are 1m, the length in the cage is recommended to be 0.78m in consideration of the convenience of wiring and installation, the radius of the cage is estimated according to the breakdown field intensity of the extremely-uneven air gap and can not be less than 20cm at least, in fact, the radius of the cage is 0.36m in consideration of the convenience of wiring and installation in order to reserve a margin for the later experimental voltage and guarantee the safety of the experiment to the maximum extent.
Meanwhile, the embodiment also improves the mode of transferring the particles in the combustion chamber into the deposition chamber, and in order to solve the problem of particle transmission, a negative pressure pumping mode is adopted, namely, the connection between the combustion chamber and the deposition chamber is firstly cut off, air pressure is pumped in the deposition chamber, so that the air pressure of the combustion chamber is higher than that of the deposition chamber, and then the combustion chamber and the deposition chamber are communicated, so that the purpose of spreading the particles along the air pressure difference is achieved. The mode does not need an external gas cylinder, and the safety of the device and the simplicity of the structure are improved.
The above description is only exemplary of the present invention and should not be taken as limiting the invention, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a controllable negative pressure formula simulation test analysis platform of environmental condition which characterized in that, this platform includes: 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; wherein:
A) the simulation apparatus includes:
a combustion chamber for creating pollutants for a simulated environment;
the device comprises a negative pressure deposition chamber, a first electrode, a second electrode, a third electrode and a fourth electrode, wherein a segmented corona cage and a conductor sample to be tested are arranged in the negative pressure deposition chamber; the negative pressure deposition chamber is used for introducing pollutants simulating the environment by using a negative pressure principle and depositing the pollutants on a tested lead sample;
the control assembly is arranged on a communication channel between the combustion chamber and the deposition chamber and is used for controlling and monitoring the size and the flow of the simulated pollutants;
B) the test analysis device includes:
the environment parameter measuring device is connected with the deposition chamber and is used for measuring the simulated environment parameters in the deposition chamber;
the monitoring device is used for monitoring the appearance data of the conductor sample and the relevant data of the corona discharge effect of the conductor sample;
and the data analysis platform is used for analyzing the related data of the corona discharge effect and outputting an analysis result.
2. The negative pressure type simulation test analysis platform with controllable environmental conditions according to claim 1, wherein the monitoring device further comprises:
the nano-volt meter is provided with an ion flow plate, and the ion flow plate is arranged on the outer side of the corona cage and used for measuring the ion current density;
the field mill is provided with a field mill probe, and the field mill probe is arranged on the outer side of the corona cage and used for measuring a synthesized electric field;
the high-voltage power supply supplies power to the conductor sample to be tested;
and the corona current measuring device is connected with the conductor sample to be measured and is used for measuring corona current data of the conductor sample to be measured.
3. The negative pressure type simulation test analysis platform with controllable environmental conditions according to claim 2, wherein the corona current measuring device further comprises:
the measuring capacitor is connected with the conductor sample to be measured and used for voltage division;
the sampling resistor is connected with the measuring capacitor and is used for converting a corona current signal generated by corona discharge into a voltage signal;
and the acquisition card is respectively connected with the measuring capacitor and the sampling resistor and is used for measuring corona current data generated by the conductor sample to be detected and receiving a voltage signal.
4. The negative pressure type simulation test analysis platform with controllable environmental conditions according to claim 3, wherein the data analysis platform comprises:
the corona identification module is used for judging whether corona discharge occurs or not according to various effects of the corona discharge measured by the monitoring device;
the corona analysis module is used for defining the corona discharge intensity according to the pulse intensity and the frequency of the monitored corona current when the corona discharge is judged to occur, and realizing the detection and analysis of the discharge effect under different conditions;
and the surface state analysis module is used for establishing the corresponding relation between the corona discharge intensity and the surface topography state of the wire sample according to conductor sample topography data corresponding to the acquired different corona discharge data, and analyzing the influence of the obtained conductor surface area dirt on the corona current pulse.
5. The negative pressure type simulation test analysis platform with controllable environmental conditions according to claim 4, wherein:
the inner wall of the negative pressure deposition chamber is coated with an anti-static coating, the wall body is provided with an observation hole, and an ultraviolet camera or a high-speed charge coupled device CCD camera externally connected with the observation hole is used for observing the corona discharge and particle deposition conditions in the deposition chamber; and/or the presence of a gas in the gas,
the negative pressure deposition chamber is provided with a vacuum-pumping device for forming indoor negative pressure, so that the particulate matter 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 is arranged on the side door body in a penetrating way and is connected with the detected conductor sample.
6. The negative pressure type simulation test analysis platform with controllable environmental conditions according to claim 4, wherein the conductor sample to be tested is positioned on the central axis of the corona cage; and shielding balls are arranged at two ends of the tested conductor sample, the shielding balls are connected to the insulating rod, and the insulating rod is fixedly connected to the inner wall of the deposition chamber.
7. The negative pressure type simulation test analysis platform with controllable environmental conditions according to claim 4, wherein the environmental parameter measuring device comprises:
the concentration meter is arranged outside the deposition chamber and used for measuring the concentration of pollutants inside the deposition chamber;
the barometer is arranged outside the deposition chamber and used for measuring the air pressure inside the deposition chamber;
and the hygrothermograph is arranged outside the deposition chamber and is used for measuring the temperature and the humidity inside the deposition chamber.
8. The negative pressure type simulation test analysis platform with controllable environmental conditions according to any one of claims 1 to 7, wherein the control assembly further comprises:
the valve is arranged on a communication channel between the combustion chamber and the deposition chamber and is used for controlling the opening and closing of a pollutant channel;
the particle size filter is arranged at the pollutant inlet and used for controlling the particle size of particles introduced into the negative pressure deposition chamber;
and the tachometer is arranged on a communication channel between the combustion chamber and the negative pressure deposition chamber and is used for measuring the flow of the pollutants.
9. The negative pressure type simulation test 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 which are stacked up and down;
the first combustion chamber is communicated with the deposition chamber through a first communication channel;
the second combustion chamber is communicated with the deposition chamber through a second communication channel;
the first communicating channel is provided with a first valve, a first particle size filter and a first speedometer, and the second communicating channel is provided with a second valve, a second particle size filter and a second speedometer.
10. The negative pressure type simulation test analysis platform with controllable environmental conditions according to claim 8, further comprising:
the water-cooling pipeline, set up in the combustion chamber with the intercommunication passageway outside of deposit room, just rivers direction in the water-cooling passageway with the gas flow direction of intercommunication passageway is reverse to be set up to be used for reducing the flue gas temperature of simulation pollutant and the influence of the exothermal to simulation test of combustion chamber.
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| CN113311300B (en) * | 2021-05-27 | 2023-10-20 | 华北电力大学（保定） | Sewage accumulation saturation characteristic test platform |
| CN113721118B (en) * | 2021-09-26 | 2023-05-30 | 华北电力大学 | Ultraviolet imaging simulation experiment device for surface burr type defect discharge of wire |
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| CN101614783B (en) * | 2009-07-31 | 2011-02-09 | 西安交通大学 | Gap discharging test device for manually simulating strong wind and sand storm and test method |
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| CN102608394B (en) * | 2012-04-01 | 2014-02-12 | 华北电力大学 | Line corona current measurement system and method |
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