CN115327306A - Particle identification method used in gas insulation environment - Google Patents
Particle identification method used in gas insulation environment Download PDFInfo
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- CN115327306A CN115327306A CN202210883256.6A CN202210883256A CN115327306A CN 115327306 A CN115327306 A CN 115327306A CN 202210883256 A CN202210883256 A CN 202210883256A CN 115327306 A CN115327306 A CN 115327306A
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- 239000002245 particle Substances 0.000 title claims abstract description 89
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000009413 insulation Methods 0.000 title claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 27
- 230000005684 electric field Effects 0.000 claims abstract description 19
- 238000005259 measurement Methods 0.000 claims abstract description 18
- 238000012360 testing method Methods 0.000 claims abstract description 13
- 239000011859 microparticle Substances 0.000 claims description 6
- 229910001369 Brass Inorganic materials 0.000 claims description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 239000010951 brass Substances 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 238000012937 correction Methods 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 238000002789 length control Methods 0.000 claims 1
- 239000002923 metal particle Substances 0.000 abstract description 10
- 230000033001 locomotion Effects 0.000 abstract description 9
- 230000006378 damage Effects 0.000 abstract description 3
- 230000006399 behavior Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
-
- 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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- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- General Physics & Mathematics (AREA)
- Biochemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Dispersion Chemistry (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Acoustics & Sound (AREA)
- Measurement Of Resistance Or Impedance (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention provides a particle identification method used in a gas insulation environment. The method comprises the following steps: acquiring the relation between the surface electric field of the shell of the test sample and the applied voltage according to the gas insulation structure of the test sample; pressurizing the sample by adopting a step-by-step pressure increasing method; carrying out ultrahigh frequency partial discharge measurement and ultrasonic measurement to obtain a partial discharge signal; determining the equivalent size of the particles according to the partial discharge signal; determining the type of the particles according to the equivalent size of the particles; and determining the material of the particles according to the partial discharge signal. The invention can be used for identifying metal particles with different sizes in motion, so as to provide a solution for different degrees of harm caused by the motion of the particles with different sizes.
Description
Technical Field
The application relates to the technical field of electric power engineering, in particular to a particle identification method used in a gas insulation environment, which is suitable for identifying particle defects under gas insulation in the field of electric power engineering.
Background
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 enlarged. However, in the GIS production, assembly and operation processIn (2), metal particles are inevitably generated. The shape, size and material of the metal particles have a significant influence on reducing the original insulation strength of the GIS, and the movement of the particles is an important cause of the breakdown of the metal particles, as shown in fig. 1. Wherein v is u And v d Respectively representing the velocities of the metal particles before and after the collision.
Because the movement behaviors of the particles with different sizes under the operating voltage are different, the collision strength, frequency and position of the particles with different sizes with the GIS shell are different in the movement process; meanwhile, the attenuation rules of the generated collision signals are different. When metal particles with different sizes move and collide between electrodes, the electric field is distorted to different degrees, and therefore breakdown faults of different degrees in the GIS equipment are possibly caused. Therefore, how to establish a corresponding quantitative relation between the collision strength and the collision signal attenuation law of the particles with different sizes and the motion behavior of the particles and realize the estimation of the particle size through the collision strength and the collision signal attenuation law can provide an important basis for the judgment of the harmfulness of the subsequent metal particles.
Disclosure of Invention
In view of the above, the present invention provides a particle identification method for use in a gas-insulated environment, so as to identify metal particles of different sizes that are in motion, so as to provide a solution to the different levels of damage caused by the motion of particles of different sizes.
The technical scheme of the invention is realized in the following way:
a method for particle identification in a gas-insulated environment, the method comprising:
acquiring the relation between the surface electric field of the shell of the test sample and the applied voltage according to the gas insulation structure of the test sample;
pressurizing the test sample by adopting a step-by-step pressure increasing method;
carrying out ultrahigh frequency partial discharge measurement and ultrasonic measurement to obtain a partial discharge signal;
determining the equivalent size of the particles according to the partial discharge signal;
determining the type of the particles according to the equivalent size of the particles;
and determining the material of the particles according to the partial discharge signal.
Preferably, the relationship between the electric field on the surface of the shell of the sample and the applied voltage is as follows: u = kE;
wherein U is applied voltage, E is the surface electric field of the shell, and k is the electric field uniformity correction coefficient.
Preferably, when the sample is pressurized, the voltage frequency is 10 Hz, and the pressurizing step control position is 0.5 kV/m.
Preferably, the partial discharge signal includes:
partial discharge quantity Q, ultrasonic signal amplitude Pm and ultrasonic wave length S.
Preferably, the partial discharge quantity Q is obtained through ultrahigh frequency partial discharge measurement;
and measuring to obtain the amplitude Pm and the ultrasonic wave length S of the ultrasonic signal through ultrasonic measurement.
Preferably, the equivalent size of the particles is calculated using the following formula:
wherein a is the equivalent size of the particles, Q is the partial discharge capacity, U is the surface electric field of the shell of the sample, and k is the conversion coefficient.
Preferably, the type of the particles is determined using the following formula:
H＝a/Pm；
wherein H is a type number, a is the equivalent size of the particle, and Pm is the ultrasonic signal amplitude.
Preferably, when H =1, the kind of the microparticle is determined to be a spherical microparticle;
when H is more than 1 and less than or equal to 1.7, determining the type of the particles as flaky particles;
when H is more than 1.7 and less than or equal to 2.6, the type of the particles is determined to be linear particles.
Preferably, the material of the particles is determined using the following formula:
X＝Pm/S；
wherein X is the material number, pm is the ultrasonic signal amplitude, and S is the ultrasonic wavelength.
Preferably, when X is more than 1.25 and less than or equal to 1.5, the material of the particles is determined to be red copper;
when X is more than 1.5 and less than or equal to 2.5, determining the material of the particles to be stainless steel;
when X is more than 2.5 and less than or equal to 4.5, determining the material of the particles to be brass;
and when X is larger than 4.5, determining the material of the particles to be a conductive paste sheet.
As can be seen from the above, in the method for identifying particles in a gas-insulated environment according to the present invention, since the relationship between the electric field on the surface of the housing of the sample and the applied voltage is obtained according to the gas-insulated structure of the sample, then the sample is pressurized by using the step-by-step voltage-increasing method, and the ultrahigh frequency partial discharge measurement and the ultrasonic measurement are performed to obtain the typical partial discharge signal, and then the equivalent size of the particles is determined according to the partial discharge signal, and the type and material of the particles are further determined, so that the corresponding particles can be accurately identified in the gas-insulated environment.
Drawings
Fig. 1 is a schematic view showing a process of collision of metal particles with an electrode.
Fig. 2 is a flow chart of a method for particle identification in a gas-insulated environment in an embodiment of the present invention.
Fig. 3 is a schematic diagram of a method for particle identification in a gas-insulated environment according to an embodiment of the present invention.
Detailed Description
In order to make the technical scheme and advantages of the invention more apparent, the invention is further described in detail with reference to the accompanying drawings and specific embodiments.
Fig. 2 is a flow chart of a method for particle identification in a gas-insulated environment in an embodiment of the present invention. Fig. 3 is a schematic diagram illustrating the principle of a particle recognition method for use in a gas-insulated environment in an embodiment of the present invention. As shown in fig. 2 and 3, the method for identifying particles in a gas-insulated environment according to the embodiment of the present invention includes the steps of:
and 11, acquiring the relation between the surface electric field of the shell of the test sample and the applied voltage according to the gas insulation structure of the test sample.
For example, the relationship between the electric field on the surface of the shell of the sample and the applied voltage may be: u = kE. Wherein U is applied voltage, E is the surface electric field of the shell, and k is the electric field uniformity correction coefficient.
And step 12, pressurizing the sample by adopting a step-by-step pressure increasing method.
For example, in one embodiment of the present invention, when pressurizing the test article, the voltage frequency may be 10 hertz (Hz) and the pressurizing step control bit may be 0.5 kilovolts/meter (kV/s).
And step 13, carrying out ultrahigh frequency partial discharge measurement and ultrasonic measurement to obtain a partial discharge signal.
For example, in one embodiment of the present invention, the partial discharge signal may include: the partial discharge Q (in pC), the ultrasonic signal amplitude Pm (in dB), and the ultrasonic wave length S (in S).
In addition, as an example, in one specific embodiment of the present invention, the partial discharge amount Q may be obtained by ultrahigh frequency partial discharge measurement.
In addition, as an example, in one specific embodiment of the present invention, the ultrasonic signal amplitude Pm and the ultrasonic wave length S may be measured by ultrasonic measurement.
And step 14, determining the equivalent size of the particles according to the partial discharge signals.
For example, in one embodiment of the present invention, the equivalent size of the particles can be calculated using the following formula:
wherein a is the equivalent size of the particles, Q is the partial discharge capacity, U is the surface electric field of the shell of the sample, and k is the conversion coefficient.
And step 15, determining the type of the particles according to the equivalent size of the particles.
For example, in one embodiment of the present invention, the following formula may be used to determine the type of the particles:
H＝a/Pm (2)
wherein H is a type number, a is the equivalent size of the particle, and Pm is the ultrasonic signal amplitude.
In the aspect of the present invention, the type of the fine particles may be determined based on the type number H calculated as described above.
For example, in one embodiment of the present invention, when H =1, the kind of the microparticle may be determined to be a spherical microparticle; when H is more than 1 and less than or equal to 1.7, the type of the particles can be determined to be flaky particles; when H is more than 1.7 and less than or equal to 2.6, the type of the particles can be determined to be linear particles.
And step 16, determining the material of the particles according to the partial discharge signal.
For example, in one embodiment of the present invention, the following formula may be used to determine the material of the particles:
X＝Pm/S (2)
wherein X is the material number, pm is the ultrasonic signal amplitude, and S is the ultrasonic wavelength.
In the technical solution of the present invention, the material of the fine particles may be determined based on the material number X obtained by the calculation.
For example, in one embodiment of the present invention, when X is more than 1.25 and less than or equal to 1.5, the material of the particles can be determined to be red copper; when X is more than 1.5 and less than or equal to 2.5, the material of the particles can be determined to be stainless steel; when X is more than 2.5 and less than or equal to 4.5, determining that the material of the particles is brass; when X is greater than 4.5, the material of the particles can be determined to be a conductive paste sheet.
Therefore, the above steps 11 to 16 allow the corresponding particles to be accurately identified in the gas-insulated environment.
In summary, in the technical solution of the present invention, a relationship between an electric field on a surface of a housing of a sample and an applied voltage is obtained according to a gas insulation structure of the sample, then the sample is pressurized by a step-by-step voltage boosting method, and ultrahigh frequency partial discharge measurement and ultrasonic measurement are performed to obtain a typical partial discharge signal, and then an equivalent size of a particle is determined according to the partial discharge signal, and a type and a material of the particle are further determined, so that the corresponding particle can be accurately identified in a gas insulation environment.
When the technical scheme of the invention is used, an ultrasonic detector can be adopted to measure the intensity signal and the signal attenuation frequency of the moving particles in the gas insulation environment colliding with the GIS shell, then the collision intensity signal can be converted into the ultrasonic pulse frequency of the ultrasonic detector, the frequency of the particles colliding with the GIS shell can be basically estimated through the ultrasonic pulse frequency, and further the sizes of different particles can be judged. Therefore, by using the technical scheme, metal particles with different sizes moving in the GIS can be identified, so that a solution for different degrees of harm generated by the movement of the particles with different sizes is provided.
In addition, the method is simple and convenient to calculate, has obvious physical significance, and solves the problem that the particle size is difficult to estimate in a gas insulation environment in test and engineering application.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A method for particle identification in a gas-insulated environment, the method comprising:
acquiring the relation between the surface electric field of the shell of the test sample and the applied voltage according to the gas insulation structure of the test sample;
pressurizing the sample by adopting a step-by-step pressure increasing method;
carrying out ultrahigh frequency partial discharge measurement and ultrasonic measurement to obtain a partial discharge signal;
determining the equivalent size of the particles according to the partial discharge signal;
determining the type of the particles according to the equivalent size of the particles;
and determining the material of the particles according to the partial discharge signal.
2. The method of claim 1,
the relation between the surface electric field of the shell of the test article and the applied voltage is as follows: u = kE;
wherein U is applied voltage, E is the surface electric field of the shell, and k is the electric field uniformity correction coefficient.
3. The method of claim 1, wherein:
when the sample is pressurized, the voltage frequency is 10 Hz, and the pressurizing step length control position is 0.5 kV/m.
4. The method of claim 1, wherein the partial discharge signal comprises:
partial discharge quantity Q, ultrasonic signal amplitude Pm and ultrasonic wave length S.
5. The method of claim 4, wherein:
obtaining partial discharge quantity Q through ultrahigh frequency partial discharge measurement;
and measuring to obtain the amplitude Pm and the ultrasonic wave length S of the ultrasonic signal through ultrasonic measurement.
6. The method of claim 4, wherein the equivalent size of the particles is calculated using the following formula:
wherein a is the equivalent size of the particles, Q is the partial discharge capacity, U is the surface electric field of the shell of the test sample, and k is the conversion coefficient.
7. The method of claim 6, wherein the type of particle is determined using the following formula:
H＝a/Pm；
wherein H is a type number, a is the equivalent size of the particle, and Pm is the ultrasonic signal amplitude.
8. The method of claim 7, wherein:
when H =1, determining the kind of the microparticle to be a spherical microparticle;
when H is more than 1 and less than or equal to 1.7, determining the type of the particles as flaky particles;
when H is more than 1.7 and less than or equal to 2.6, the type of the particles is determined to be linear particles.
9. The method of claim 7, wherein the material of the particles is determined using the following formula:
X＝Pm/S；
wherein X is the material number, pm is the ultrasonic signal amplitude, and S is the ultrasonic wavelength.
10. The method of claim 9, wherein:
when X is more than 1.25 and less than or equal to 1.5, determining the material of the particles to be red copper;
when X is more than 1.5 and less than or equal to 2.5, determining the material of the particles to be stainless steel;
when X is more than 2.5 and less than or equal to 4.5, determining the material of the particles to be brass;
and when X is larger than 4.5, determining the material of the particles to be a conductive paste sheet.
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| CN202210883256.6A CN115327306A (en) | 2022-07-26 | 2022-07-26 | Particle identification method used in gas insulation environment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113848442A (en) * | 2021-10-22 | 2021-12-28 | 云南电网有限责任公司电力科学研究院 | Method and device for identifying particle size defects in gas insulation environment |
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| CN113848442A (en) * | 2021-10-22 | 2021-12-28 | 云南电网有限责任公司电力科学研究院 | Method and device for identifying particle size defects in gas insulation environment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113848442A (en) * | 2021-10-22 | 2021-12-28 | 云南电网有限责任公司电力科学研究院 | Method and device for identifying particle size defects in gas insulation environment |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113848442A (en) * | 2021-10-22 | 2021-12-28 | 云南电网有限责任公司电力科学研究院 | Method and device for identifying particle size defects in gas insulation environment |
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