CN113848442A - Method and device for identifying particle size defects in gas insulation environment - Google Patents
Method and device for identifying particle size defects in gas insulation environment Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 52
- 239000002245 particle Substances 0.000 title claims abstract description 28
- 230000007547 defect Effects 0.000 title claims abstract description 18
- 238000009413 insulation Methods 0.000 title abstract description 7
- 239000002923 metal particle Substances 0.000 claims abstract description 152
- 239000000463 material Substances 0.000 claims abstract description 28
- 230000005684 electric field Effects 0.000 claims abstract description 24
- 238000005259 measurement Methods 0.000 claims abstract description 16
- 230000006378 damage Effects 0.000 claims abstract description 15
- 230000008569 process Effects 0.000 claims abstract description 15
- 238000004364 calculation method Methods 0.000 claims description 23
- 239000010419 fine particle Substances 0.000 claims description 15
- 239000002184 metal Substances 0.000 claims description 15
- 229910052751 metal Inorganic materials 0.000 claims description 15
- 229910001220 stainless steel Inorganic materials 0.000 claims description 5
- 239000010935 stainless steel Substances 0.000 claims description 5
- 229910001369 Brass Inorganic materials 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 239000010951 brass Substances 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 239000012798 spherical particle Substances 0.000 claims description 4
- 230000033001 locomotion Effects 0.000 description 12
- 230000006399 behavior Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 229910001111 Fine metal Inorganic materials 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1254—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 gas-insulated power appliances or vacuum gaps
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1209—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 using acoustic measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
Abstract
The application discloses a method and a device for identifying particle size defects in a gas insulation environment, wherein the method comprises the following steps: and obtaining a first coefficient value according to the effective values of the electric field and the voltage on the surface of the GIS shell. And pressurizing the GIS by adopting a step-by-step boosting method, and carrying out ultrahigh frequency partial discharge measurement on the GIS all the time in the pressurizing process. And obtaining the local discharge amount, the ultrasonic signal amplitude and the ultrasonic wavelength at any time. And obtaining the equivalent size of the metal particles according to the voltage effective value, the partial discharge amount and the first coefficient value. And obtaining the type of the metal particles according to the equivalent size of the metal particles and the amplitude of the ultrasonic signal. Obtaining the material of the metal particles according to the ultrasonic signal amplitude and the ultrasonic wavelength; and judging the damage degree of the metal particles according to the type of the metal particles and the material of the metal particles. According to the method, the hazard degree of the metal particles moving in the GIS is identified, so that an important basis is provided for the judgment of the hazard of the metal particles.
Description
Technical Field
The invention relates to the technical field of electric power engineering, in particular to a method and a device for identifying particle size defects in a gas insulation environment.
Background
At present, in the rapid development process of high-voltage long-distance large-capacity power transmission technology in China, the application scale of Gas Insulated metal enclosed Switchgear (GIS) is continuously expanding. GIS has obtained extensive application with compact structure, area is little, the reliability is high, the security is strong, adaptability is strong etc. advantage.
However, metal particles are inevitably generated in the GIS production, assembly and operation processes. The metal particles move under the action of the electric field force, when the electric field intensity is larger than a specific value, the metal particles can jump between the grounding shell and the high-voltage conductor, partial discharge occurs, the electric field is distorted in different degrees, and the problem of breakdown faults in different degrees in the GIS equipment is caused. Once a fault occurs, the safe operation of the power system is threatened. The three major factors of the type, the size and the material of the metal particles can obviously influence the reduction of the original insulation strength of the GIS, and because the motion behaviors of the metal particles with different sizes are different in the operation process, the collision strength, the frequency and the position of the metal particles with different sizes with a GIS shell are different in the motion process, and meanwhile, the attenuation rules of generated collision signals are different. In the prior art, a motion diagram library of metal particles is used for analyzing a motion trajectory diagram of the metal particles to obtain form data of the metal particles, and then whether the form data exceeds a hazard boundary is judged, and the metal particles are cleaned according to a judgment result.
Because the field installation condition is complicated, metal particles can be continuously generated due to various reasons, and the existing technology can not ensure that the metal particles can be completely cleaned, so how to establish a certain amount of relation between the collision strength and the collision signal attenuation rule of the metal particles with different sizes and the motion behavior of the metal particles, and how to estimate the size of the metal particles through the collision strength and the collision signal attenuation rule provide an important basis for judging the harmfulness of the subsequent metal particles, and the method is a technical problem to be solved urgently at present.
Disclosure of Invention
The invention provides a method and a device for identifying particle size defects in a gas insulation environment, which are used for solving the problem that metal particles with different sizes move and collide between electrodes to cause distortion of an electric field to different degrees, so that breakdown faults of different degrees in GIS equipment are caused. The invention provides a solution for different degrees of harm generated by movement of metal particles with different sizes by identifying the metal particles with different sizes moving in the GIS.
The invention is realized by the following technical scheme:
in a first aspect, the present application provides a method for identifying particle size defects in a gas-insulated environment, the method comprising:
obtaining a first coefficient value according to the effective values of the electric field and the voltage on the surface of the GIS shell;
pressurizing the GIS by adopting a step-by-step boosting method, and carrying out ultrahigh frequency partial discharge measurement on the GIS all the time in the pressurizing process; obtaining the local discharge amount, the ultrasonic signal amplitude and the ultrasonic wave length at any moment;
obtaining the equivalent size of the metal particles according to the voltage effective value, the partial discharge amount and the first coefficient value;
obtaining the type of the metal particles according to the equivalent size of the metal particles and the amplitude of the ultrasonic signal;
obtaining the material of the metal particles according to the ultrasonic signal amplitude and the ultrasonic wavelength;
and judging the damage degree of the metal particles according to the type of the metal particles and the material of the metal particles.
Further, the first coefficient value:
k＝U/E；
and k is the first coefficient value, U is the effective value of the voltage, and E is the field intensity of the surface of the GIS shell.
Further, the step-by-step boosting method is to adopt a voltage frequency of 10Hz and control the pressurizing step speed to be 0.5 kv/s.
Further, the equivalent size of the metal fine particles:
wherein a is the equivalent size of the metal particles, Q is the partial discharge capacity, U is the effective value of the voltage, and k is the first coefficient value.
Further, the kind of the metal fine particles:
H＝a/Pm；
wherein H is the kind of the metal fine particles, a is the equivalent size of the metal fine particles, PmIs the ultrasonic signal amplitude. Further, the material of the metal fine particles is:
X＝Pm/S；
wherein X is the material of the metal particles, S is the ultrasonic wavelength, PmIs the ultrasonic signal amplitude.
Further, the types of the metal fine particles include spherical fine particles, flake fine particles and linear fine particles.
Furthermore, the metal particles are made of red copper, stainless steel, brass and conductive paste pieces.
In a second aspect, the present application also provides a gas-insulated environment particle size defect identification apparatus, the apparatus comprising:
an acquisition unit: the method comprises the steps of acquiring an electric field and a voltage effective value of the surface of the GIS shell;
the first calculation unit: the device is used for calculating to obtain a first coefficient value according to the effective values of the electric field and the voltage of the surface of the GIS shell obtained by the obtaining unit;
a measurement unit: the device is used for gradually boosting the GIS, and performing ultrahigh frequency partial discharge measurement on the GIS in the boosting process to obtain partial discharge capacity, ultrasonic signal amplitude and ultrasonic wave length;
a second calculation unit: the equivalent size of the metal particles is obtained through calculation according to the first coefficient value, the voltage effective value and the partial discharge amount obtained by the first calculating unit;
a third calculation unit: the ultrasonic signal amplitude value and the equivalent size of the metal particles are obtained according to the second calculation unit, and the types of the metal particles are obtained through calculation;
a fourth calculation unit: the ultrasonic signal amplitude and the ultrasonic wavelength are obtained by the measuring unit, and the material of the metal particles is obtained;
a judging unit: and the damage degree of the metal particles is judged according to the types of the metal particles and the materials of the metal particles obtained by the third calculating unit and the fourth calculating unit.
The invention provides a solution for different degrees of harm generated by movement of metal particles with different sizes by identifying the metal particles with different sizes moving in the GIS. By adopting the scheme, a certain amount of relation can be established between the collision strength and the collision signal attenuation rule of the particles with different sizes and the motion behavior of the metal particles, the estimation of the size of the metal particles is realized through the collision strength and the collision signal attenuation rule, and an important basis is provided for the subsequent judgment of the harmfulness of the metal particles.
The technical scheme of this application mainly adopts ultrasonic detector to measure the intensity signal and the signal attenuation frequency that metal particle collided the GIS shell in the gas-insulated environment, collision intensity signal can turn into ultrasonic detector's ultrasonic pulse frequency, can estimate out the frequency that metal particle collided the shell basically through ultrasonic pulse frequency, and ultrasonic wavelength, partial discharge volume and ultrasonic signal amplitude, and then judge out different metal particle's size, this application calculates portably, and is simple in operation, the problem that metal particle size is difficult to estimate under the gas-insulated environment in experimental and engineering application has been overcome.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.
FIG. 1 is a flow chart of a method for identifying particle size defects in a gas insulated environment according to the present application;
FIG. 2 is a schematic diagram of a process of collision of metal particles with an electrode provided herein;
fig. 3 is a schematic structural diagram of a device for identifying particle size defects in a gas insulated environment according to the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying 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.
In the GIS production, assembly and operation process, metal particles are inevitably generated. The metal particles move under the action of the electric field force, when the electric field intensity is greater than a specific value, the metal particles possibly jump between the grounding shell and the high-voltage conductor, partial discharge occurs, the electric field is distorted in different degrees, the problem of breakdown faults in different degrees in the GIS equipment is caused, and once the faults occur, the safe operation of a power system is threatened. Therefore, the method and the device for identifying the particle size defect in the gas insulation environment can realize the estimation of the size of the metal particle according to the certain relation among the collision strength, the collision signal attenuation rule and the motion behavior of the metal particle of different sizes, and provide an important basis for the judgment of the harmfulness of the subsequent metal particle. The technical scheme of the application is explained in detail as follows:
referring to fig. 1, a flow chart of a method for identifying particle size defects in a gas insulated environment according to the present application is shown;
as can be seen from fig. 1, the present application provides a method for identifying particle size defects in a gas insulated environment, the method including:
step S1: obtaining a first coefficient value according to the effective values of the electric field and the voltage on the surface of the GIS shell; the effective voltage value and the electric field strength of the surface of the housing of the gas Insulated metal enclosed switchgear (GIS) can be obtained by measuring the GIS, according to the effective voltage value and the electric field strength obtained by measurement, the effective voltage value is recorded as U, the electric field strength is recorded as E, that is, the relationship between the effective voltage value and the electric field strength is U-kE, and then the first coefficient value k is obtained by calculation.
Step S2: pressurizing the GIS by adopting a step-by-step boosting method, and carrying out ultrahigh frequency partial discharge measurement or ultrasonic measurement on the GIS all the time in the pressurizing process; the two measurement methods can obtain the local discharge amount, the ultrasonic signal amplitude and the ultrasonic wave length at any time; the step-by-step boosting method adopts the voltage frequency of 10Hz and the pressurizing step speed is controlled to be 0.5 kv/s.
Applying alternating voltage to the GIS cavity, when the voltage is applied to a certain degree, the metal particles in the GIS cavity generate discharge, as can be seen from figure 2, the metal particles start to discharge after colliding with the high-voltage electrode HV in the movement and discharge process of the metal particles, and when the metal particles discharge, the partial discharge amount, the ultrasonic signal amplitude and the ultrasonic wavelength of the metal particles can be obtained through ultrahigh frequency partial discharge measurement. In fig. 2, G denotes a ground electrode of the GIS case, Q denotes a partial discharge amount measured by the ultrahigh frequency partial discharge, e denotes an electric field of the ground electrode surface, and HV denotes a high voltage electrode.
The ultrahigh frequency partial discharge measurement has the characteristics of high detection sensitivity and strong anti-interference capability, and is suitable for GIS partial discharge measurement under the field conditions of power plants and substations. The partial discharge phenomenon caused by the GIS comprises the following steps: free metal particle discharge, floating potential body discharge, creeping discharge, air gap discharge inside the insulator, metal point discharge, etc. The present application is directed to techniques for the phenomenon of free metal particle discharge.
Step S3: obtaining the equivalent size of the metal particles according to the voltage effective value, the partial discharge amount and the first coefficient value:
wherein a is the equivalent size of the metal particles, Q is the partial discharge capacity, U is the effective value of the voltage, and k is the first coefficient value.
Step S4: obtaining the type of the metal particles according to the equivalent size of the metal particles and the amplitude of the ultrasonic signal:
H＝a/Pm；
wherein H is the kind of the metal fine particles, a is the equivalent size of the metal fine particles, PmIs the ultrasonic signal amplitude.
The type of the metal particles is calculated according to the formula, and if H is 1, the metal particles are spherical particles; if 1< H < ═ 1.7, flaky particles are obtained; 1.7< H, which is a linear particle.
Step S5: obtaining the material of the metal particles according to the ultrasonic signal amplitude and the ultrasonic wavelength:
X＝Pm/S；
wherein X is the material of the metal particles, S is the ultrasonic wavelength, PmIs the ultrasonic signal amplitude.
The material of the metal particles is red copper if 1.25< X < 1.5 according to the formula; brass if 1.5< X < ═ 2.5; 2.5< X < ═ 4.5, stainless steel; 4.5< X, which is a conductive paste sheet.
Step S6: and judging the damage degree of the metal particles according to the type of the metal particles and the material of the metal particles.
And when the type of the metal particles calculated according to the equivalent size of the metal particles is any one of spherical particles, flaky particles and linear particles, the metal particles are high in damage degree and need to be immediately manually cleaned. If the metal particles are made of stainless steel and conductive paste pieces, the metal particles are safe, and time and labor are not wasted for cleaning and finding the positions of the metal particles.
This application through produced after free metal particle discharges the partial discharge volume ultrasonic signal amplitude with ultrasonic wavelength calculates metal particle's equivalent dimension, and then calculates metal particle's kind with metal particle's material, the rethread obtains metal particle's material judges metal particle's harm degree.
FIG. 3 is a schematic structural diagram of a particle size defect recognition apparatus in a gas insulated environment according to the present application;
as can be seen from fig. 3, the present application provides a device for identifying particle size defects in a gas-insulated environment, the device comprising:
the acquisition unit 11: the method comprises the steps of acquiring an electric field and a voltage effective value of the surface of the GIS shell; the electric field intensity of the surface of the GIS shell is related to the size of GIS equipment and the effective voltage value, so that the electric field intensity and the effective voltage value can be obtained through measurement.
The first calculation unit 12: the device is used for obtaining a first coefficient value through calculation according to the electric field and the voltage effective value of the GIS shell surface obtained by the obtaining unit 11;
k＝U/E；
and k is the first coefficient value, U is the effective value of the voltage, and E is the field intensity of the surface of the GIS shell.
The measurement unit 13: the device is used for gradually boosting the GIS, and performing ultrahigh frequency partial discharge measurement on the GIS in the boosting process to obtain the partial discharge capacity, the ultrasonic signal amplitude and the ultrasonic wavelength. The step-by-step boosting method adopts the voltage frequency of 10Hz and the pressurizing step speed is controlled to be 0.5 kv/s.
The second calculation unit 14: the equivalent size of the metal particles is obtained through calculation according to the first coefficient value, the voltage effective value and the partial discharge amount obtained by the first calculating unit 12;
wherein a is the equivalent size of the metal particles, Q is the partial discharge capacity, U is the effective value of the voltage, and k is the first coefficient value.
The third calculation unit 15: the ultrasonic signal amplitude and the equivalent size of the metal particles are obtained by the second calculation unit 14, and the type of the metal particles is obtained by calculation;
H＝a/Pm；
wherein H is the kind of the metal fine particles, a is the equivalent size of the metal fine particles, PmIs the ultrasonic signal amplitude.
The fourth calculation unit 16: the ultrasonic signal amplitude and the ultrasonic wavelength obtained by the measuring unit 13 are used for obtaining the material of the metal particles;
X＝Pm/S；
wherein X is the material of the metal particles, S is the ultrasonic wavelength, PmIs the ultrasonic signal amplitude.
The judgment unit 17: for determining the damage degree of the metal particles according to the type of the metal particles and the material of the metal particles obtained by the third calculating unit 15 and the fourth calculating unit 16.
The determination means 17 determines the degree of damage of the fine metal particles from the type of the fine metal particles and the material of the fine metal particles. The final result can be in various combinations, the equivalent sizes of different metal particles correspond to different types of metal particles and different materials of the metal particles, and when the type of the metal particles calculated according to the equivalent sizes of the metal particles is any one of spherical particles, flaky particles and linear particles, if the material of the metal particles is red copper or brass, the harm degree of the metal particles is high, and manual cleaning is required immediately. That is, the final judgment is finally made based on the material of the fine metal particles. If the metal particles are made of stainless steel and conductive paste pieces, the metal particles are safe, and time and labor are not wasted for cleaning and finding the positions of the metal particles.
The invention is used for calculating and judging the metal particles causing the GIS internal fault, wherein the metal particles generally enter GIS equipment in the production process or the transportation process and can be generated due to machine abrasion in the equipment operation. Because the metal particles can cause the internal failure of the GIS equipment, and the normal operation of a power system is influenced, the application provides the method and the device for identifying the particle size defects in the gas insulated environment, which are used for calculating and judging parameters such as the equivalent size of the metal particles, the types of the metal particles and the material of the metal particles in the GIS equipment, further judging the damage degree of the metal particles to the GIS equipment, providing reference for maintainers, reducing the workload, improving the working efficiency and providing guarantee for the efficient and stable operation of the GIS equipment.
The invention provides a solution for different degrees of harm generated by movement of metal particles with different sizes by identifying the metal particles with different sizes moving in the GIS. By adopting the scheme, a certain amount of relation can be established between the collision strength and the collision signal attenuation rule of the particles with different sizes and the motion behavior of the metal particles, the estimation of the size of the metal particles is realized through the collision strength and the collision signal attenuation rule, and an important basis is provided for the subsequent judgment of the harmfulness of the metal particles.
The technical scheme of this application mainly adopts ultrasonic detector to measure the intensity signal and the signal attenuation frequency that metal particle collided the GIS shell in the gas-insulated environment, collision intensity signal can turn into ultrasonic detector's ultrasonic pulse frequency, can estimate out the frequency that metal particle collided the shell basically through ultrasonic pulse frequency, and ultrasonic wavelength, partial discharge volume and ultrasonic signal amplitude, and then judge out different metal particle's size, this application calculates portably, and is simple in operation, the problem that metal particle size is difficult to estimate under the gas-insulated environment in experimental and engineering application has been overcome.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (9)
1. A method for identifying particle size defects in a gas-insulated environment, the method comprising:
obtaining a first coefficient value according to the effective values of the electric field and the voltage on the surface of the GIS shell;
pressurizing the GIS by adopting a step-by-step boosting method, and carrying out ultrahigh frequency partial discharge measurement on the GIS all the time in the pressurizing process; obtaining the local discharge amount, the ultrasonic signal amplitude and the ultrasonic wave length at any moment;
obtaining the equivalent size of the metal particles according to the voltage effective value, the partial discharge amount and the first coefficient value;
obtaining the type of the metal particles according to the equivalent size of the metal particles and the amplitude of the ultrasonic signal;
obtaining the material of the metal particles according to the ultrasonic signal amplitude and the ultrasonic wavelength;
and judging the damage degree of the metal particles according to the type of the metal particles and the material of the metal particles.
2. The method of claim 1, wherein the first coefficient value is:
k＝U/E；
and k is the first coefficient value, U is the effective value of the voltage, and E is the field intensity of the surface of the GIS shell.
3. The method for identifying particle size defects in a gas-insulated environment as claimed in claim 1, wherein the step-up voltage method is applied with a voltage frequency of 10Hz and the step-up voltage speed is controlled to be 0.5 kv/s.
4. The method of claim 1, wherein the equivalent size of the metal particles is:
wherein a is the equivalent size of the metal particles, Q is the partial discharge capacity, U is the effective value of the voltage, and k is the first coefficient value.
5. The method of claim 1, wherein the metal particles are of the following types:
H＝a/Pm；
wherein H is the kind of the metal fine particles, a is the equivalent size of the metal fine particles, PmIs the ultrasonic signal amplitude.
6. The method of claim 1, wherein the metal particles are selected from the group consisting of:
X＝Pm/S；
wherein X is the material of the metal particles, S is the ultrasonic wavelength, PmIs the ultrasonic signal amplitude.
7. The method of claim 1, wherein the metal particles are selected from the group consisting of spherical particles, flake particles, and wire particles.
8. The method of claim 1, wherein the metal particles are selected from the group consisting of copper, stainless steel, brass, and conductive paste.
9. A gas insulated environment particle size defect identification apparatus, the apparatus comprising:
an acquisition unit: the method comprises the steps of acquiring an electric field and a voltage effective value of the surface of the GIS shell;
the first calculation unit: the device is used for calculating to obtain a first coefficient value according to the effective values of the electric field and the voltage of the surface of the GIS shell obtained by the obtaining unit;
a measurement unit: the device is used for gradually boosting the GIS, and performing ultrahigh frequency partial discharge measurement on the GIS in the boosting process to obtain partial discharge capacity, ultrasonic signal amplitude and ultrasonic wave length;
a second calculation unit: the equivalent size of the metal particles is obtained through calculation according to the first coefficient value, the voltage effective value and the partial discharge amount obtained by the first calculating unit;
a third calculation unit: the ultrasonic signal amplitude value and the equivalent size of the metal particles are obtained according to the second calculation unit, and the types of the metal particles are obtained through calculation;
a fourth calculation unit: the ultrasonic signal amplitude and the ultrasonic wavelength are obtained by the measuring unit, and the material of the metal particles is obtained;
a judging unit: and the damage degree of the metal particles is judged according to the types of the metal particles and the materials of the metal particles obtained by the third calculating unit and the fourth calculating unit.
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