CN113109673B - Method for simulating movement of metal particle defects on surface of GIS insulator - Google Patents
Method for simulating movement of metal particle defects on surface of GIS insulator Download PDFInfo
- Publication number
- CN113109673B CN113109673B CN202110267038.5A CN202110267038A CN113109673B CN 113109673 B CN113109673 B CN 113109673B CN 202110267038 A CN202110267038 A CN 202110267038A CN 113109673 B CN113109673 B CN 113109673B
- Authority
- CN
- China
- Prior art keywords
- metal particle
- particle model
- movement
- electromagnet
- insulator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
- G01R31/1245—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 line insulators or spacers, e.g. ceramic overhead line cap insulators; of insulators in HV bushings
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Management, Administration, Business Operations System, And Electronic Commerce (AREA)
Abstract
The application discloses a method for simulating movement of metal particle defects on the surface of a GIS insulator, and belongs to the field of state sensing of power transmission and transformation equipment. The application comprises the following steps: acquiring simulated metal particle size and shape data, and determining a metal particle model, a cross-sectional area and a mass; the friction coefficient between the metal particle model and the surface of the insulator is calculated according to the movement direction of the metal particle model; the horizontal distance, the current and the direction of the metal particle model and the electromagnet are determined and acquired through the coincidence of the central axis of the electromagnet and the central axis of the metal particle model, voltage is applied to the GIS, the movement distance of the metal particle model is determined, the proportional relation between the current applied by the electromagnet and the movement speed is determined, and the defect movement of the metal particles on the surface of the GIS insulator is simulated according to the movement direction, the movement distance and the movement speed of the metal particles and the applied current of the electromagnet. The application can be widely applied to the simulation movement of the metal particle defects on the surface of the GIS insulator.
Description
Technical Field
The application relates to the field of state sensing of power transmission and transformation equipment, in particular to a method for simulating metal particle defect movement on the surface of a GIS insulator.
Background
The gas-insulated switchgear GIS (Gas Insulated Switchgear) is a key device of the power system, and its main function is to cut off the power system fault and change the system operation mode. With the increase of the power grid scale in China, GIS insulation discharge faults frequently occur, wherein the discharge faults induced by metal particles have the highest proportion which reaches 57%, one of the main reasons is that the movement state of the metal particles in the gas chamber is changed under the action of multiple physical fields such as electric field force, mechanical force and the like during GIS switch operation, so that electric field distortion causes insulation breakdown, and the method mainly comprises two types, namely metal particle movement induction discharge on a GIS metal shell and metal particle movement induction discharge on a GIS insulator.
In order to research the generation and development processes of GIS discharge induced by metal particle movement, how to equivalently simulate the metal particle movement under the action of multiple physical fields such as electric field force, mechanical force and the like is the basis of experimental study. For the metal particle motion induced discharge on the GIS metal shell, a great deal of research has been carried out in the past, because the metal particles on the GIS metal shell easily obtain electric charges through the metal shell under the action of an electric field, under the action of electric field force, the charged metal particles can be moved by continuously improving experimental voltage, the movement direction is always along the direction of the electric field force, the movement speed of the metal particles is controlled by adjusting the voltage, and then the simulation of the movement of the metal particles on the GIS metal shell is realized. However, for the motion induced discharge of metal particles on a GIS insulator, the prior research is less, because the metal particles on the surface of the GIS insulator are difficult to obtain charges from the insulator, the metal particles are difficult to move under the action of electric field force, and other methods for moving the metal particles by externally applying impact vibration have high randomness, the movement direction and movement speed of the particles are difficult to control, the experimental efficiency is extremely low, and the research is difficult to develop.
Disclosure of Invention
The application provides a method for simulating the movement of metal particle defects on the surface of a GIS insulator, which controls the movement direction and speed of the permanent magnetic metal particles on the surface of the GIS insulator according to the current magnitude, direction and time of an electromagnet outside the GIS shell, and realizes the movement simulation of the metal particle defects on the surface of the GIS insulator, and comprises the following steps:
acquiring simulated metal particle size and shape data, determining a metal particle model according to the size and shape data, and determining the cross-sectional area and the quality of the metal particle model;
placing a metal particle model on the surface of an insulator to enable the metal particle model to move, acquiring the inclination angle of the surface of the insulator and the movement direction of the metal particle model when the metal particle model moves, and acquiring the friction coefficient between the metal particle model and the surface of the insulator according to the inclination angle of the surface of the insulator and the movement direction of the metal particle model;
mounting an insulator with a metal particle model and an electromagnet outside a GIS shell, enabling the central axis of the electromagnet to coincide with the central axis of the metal particle model, and determining the horizontal distance between the metal particle model and the electromagnet;
adjusting the current and direction of the electromagnet, and determining the current when the metal particle model moves towards the center of the insulator along the direction of the central axis;
determining magnetic induction coefficients of the electromagnet and the metal particle model according to the cross section area, the mass, the friction coefficient, the horizontal distance and the current;
placing a metal particle model at a target position in a closed GIS, applying voltage to the GIS, and determining the movement distance of the metal particle model, and the current and the movement speed applied by an electromagnet;
determining the movement distance of the metal particle model, the proportional relation between the current applied by the electromagnet and the movement speed, and determining the movement direction, the movement distance and the movement speed of the metal particle simulation movement and the applied current of the electromagnet according to the proportional relation;
and simulating the defect movement of the metal particles on the surface of the GIS insulator according to the movement direction, movement distance and movement speed of the metal particles during simulation movement and the applied current of the electromagnet.
Optionally, the metal particle model adopts a metal permanent magnet material.
Optionally, the calculation formula of the magnetic induction coefficient is:
k＝(mμ×(1+5d 0 )/S)0.5×5000/I 0 ；
wherein k is the magnetic induction coefficient, m is the mass of the electronic particle model, μ is the friction coefficient, d 0 Is the horizontal distance between the metal particles and the electromagnet, I 0 Is the current when the metal particles move.
Optionally, the proportional relation is calculated as follows:
(kI/5000)2×S/(1+5(d 0 +D))-mμ)+((kI/5000)2×S/(1+5d 0 )-mμ)]×4.9×D＝0.5×m×V 2
wherein I is the current applied by the electromagnet, D is the moving distance of the metal particle model along the axis of the metal particle model, and V is the moving maximum speed.
Optionally, the time of the applied current of the electromagnet is calculated as follows:
T＝2D/V；
wherein D is the movement distance, V is the maximum movement speed.
The application has the advantages of convenient operation and controllable movement direction and movement speed of the metal particles under the action of multiple physical fields of electric field force and mechanical force, and can be widely applied to the simulation of the movement of the metal particle defects on the surface of the GIS insulator.
Drawings
FIG. 1 is a flow chart of a method for simulating the movement of metal particle defects on the surface of a GIS insulator according to the present application;
FIG. 2 is a schematic diagram of simulation of movement of metal particles on the surface of an insulator in a GIS according to the present application;
FIG. 3 is a diagram showing an example of simulation of movement of metal particles under multiple physical fields according to the present application.
Detailed Description
The exemplary embodiments of the present application will now be described with reference to the accompanying drawings, however, the present application may be embodied in many different forms and is not limited to the examples described herein, which are provided to fully and completely disclose the present application and fully convey the scope of the application to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the application. In the drawings, like elements/components are referred to by like reference numerals.
Unless otherwise indicated, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. In addition, it will be understood that terms defined in commonly used dictionaries should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
The application provides a method for simulating the movement of metal particle defects on the surface of a GIS insulator, which is shown in figure 1 and comprises the following steps:
acquiring simulated metal particle size and shape data, determining a metal particle model according to the size and shape data, and determining the cross-sectional area and the quality of the metal particle model;
placing a metal particle model on the surface of an insulator to enable the metal particle model to move, acquiring the inclination angle of the surface of the insulator and the movement direction of the metal particle model when the metal particle model moves, and acquiring the friction coefficient between the metal particle model and the surface of the insulator according to the inclination angle of the surface of the insulator and the movement direction of the metal particle model;
mounting an insulator with a metal particle model and an electromagnet outside a GIS shell, enabling the central axis of the electromagnet to coincide with the central axis of the metal particle model, and determining the horizontal distance between the metal particle model and the electromagnet;
adjusting the current and direction of the electromagnet, and determining the current when the metal particle model moves towards the center of the insulator along the direction of the central axis;
determining magnetic induction coefficients of the electromagnet and the metal particle model according to the cross section area, the mass, the friction coefficient, the horizontal distance and the current;
placing a metal particle model at a target position in a closed GIS, applying voltage to the GIS, and determining the movement distance of the metal particle model, and the current and the movement speed applied by an electromagnet;
determining the movement distance of the metal particle model, the proportional relation between the current applied by the electromagnet and the movement speed, and determining the movement direction, the movement distance and the movement speed of the metal particle simulation movement and the applied current of the electromagnet according to the proportional relation;
and simulating the defect movement of the metal particles on the surface of the GIS insulator according to the movement direction, movement distance and movement speed of the metal particles during simulation movement and the applied current of the electromagnet.
Wherein, the metal particle model adopts metal permanent magnet material.
The calculation formula of the magnetic induction coefficient is as follows:
k＝(mμ×(1+5d 0 )/S)0.5×5000/I 0 ；
wherein k is the magnetic induction coefficient, m is the mass of the electronic particle model, μ is the friction coefficient, d 0 Is the horizontal distance between the metal particles and the electromagnet, I 0 Is the current when the metal particles move.
Wherein, the proportional relation, the calculation formula is as follows:
(kI/5000)2×S/(1+5(d 0 +D))-mμ)+((kI/5000)2×S/(1+5d 0 )-mμ)]×4.9×D＝0.5×m×V 2
wherein I is the current applied by the electromagnet, D is the moving distance of the metal particle model along the axis of the metal particle model, and V is the moving maximum speed.
The time of the applied current of the electromagnet is calculated as follows:
T＝2D/V；
wherein D is the movement distance, V is the maximum movement speed.
The specific implementation steps are as follows:
1) According to the size and shape of the metal particles to be simulated, processing a required cylindrical metal particle model by adopting a metal permanent magnet material, measuring the mass m of the metal particle model by a bearing method, measuring the diameter D and the length L of the cross section of the metal particle model by a vernier caliper, and calculating to obtain the cross section area S= 3.1416 × (D/2) 2 of the metal particle model
Wherein, as shown in FIG. 2, the length of the particles is 5mm, the radius is 0.3mm, the sectional area is about 0.3mm < 2 >, and the mass is 0.01g;
2) Placing a metal particle model on an uninstalled insulator inclined plane, arranging a cylindrical metal particle model along the radial direction of an insulator, wherein one end of the cylindrical metal particle model points to a central electrode of the insulator, and the other end of the cylindrical metal particle model points to the edge of the insulator, gradually adjusting the inclination angle of the insulator inclined plane to enable the metal particle model to just start to move along the axial direction, setting the angle at the moment as theta, and obtaining the friction coefficient mu=tan theta of the metal particles and the insulator;
3) The method comprises the steps of mounting an insulator on a GIS, placing a metal particle model at a position to be studied on the horizontal plane of the insulator, arranging the metal particle model along the radial direction of the insulator, enabling one end of the metal particle model to point to a central electrode of the insulator and the other end to point to the edge of the insulator, mounting an electromagnet outside the GIS shell, enabling the central axis of the electromagnet to coincide with the central axis of the metal particle model, and measuring the horizontal distance d0 between the metal particles and the electromagnet;
4) The current and the direction of the electromagnet are gradually adjusted, so that the metal particle model just starts to move towards the center of the insulator along the axis direction, and the current at the moment is I0.
5) The magnetic induction coefficient k of the electromagnet and the metal particle model is estimated according to the measurement quantity, and the calculation method comprises the following steps:
k＝(mμ×(1+5d0)/S)0.5×5000/I0
according to steps 2 to 5, μ=1, i0=1a, d0=1cm, k=90000;
6) Resetting the metal particle model to a position to be studied on the insulator horizontal plane, closing a sealing cover according to a GIS installation process, vacuumizing, filling SF6 gas, and applying voltage to the GIS. Setting the movement distance D of the metal particle model along the axis of the metal particle model, wherein the current applied by an electromagnet is I, the movement maximum speed V is more than or equal to 5L, D is more than or equal to-5L, the movement to the center of the insulator is positive movement, and negative movement is opposite to the positive movement, the current applied direction is the same as I0, and the current applied direction is opposite to the I0 direction;
according to step 6, assuming that the movement distance to be simulated is 1cm and the maximum speed is 0.2mm/ms, the current of the electromagnet can be estimated to be i=1.5a.
7) The relationship between D, I, V can be estimated, and the calculation method is as follows:
[((kI/5000)2×S/(1+5(d0+D))-mμ)+((kI/5000)2×S/(1+5d0)-mμ)]×4.9×D＝0.5×m×V2
when the method is applied, according to the requirements of metal particle motion simulation, the required motion direction, motion distance D and motion maximum speed V of the metal particles are determined, and according to the relation among the three components of 6) D, I, V, the current I applied by the electromagnet is estimated, wherein the time for applying the current is estimated according to the following formula:
T＝2D/V
according to step 7, the electromagnet current application time was 0.1s.
The application has the advantages of convenient operation and controllable movement direction and movement speed of the metal particles under the action of multiple physical fields of electric field force and mechanical force, and can be widely applied to the simulation of the movement of the metal particle defects on the surface of the GIS insulator.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The scheme in the embodiment of the application can be realized by adopting various computer languages, such as object-oriented programming language Java, an transliteration script language JavaScript and the like.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (5)
1. A method for simulating movement of metal particle defects on the surface of a GIS insulator, the method comprising:
acquiring simulated metal particle size and shape data, determining a metal particle model according to the size and shape data, and determining the cross-sectional area and the quality of the metal particle model;
placing a metal particle model on the surface of an insulator to enable the metal particle model to move, acquiring the inclination angle of the surface of the insulator and the movement direction of the metal particle model when the metal particle model moves, and acquiring the friction coefficient between the metal particle model and the surface of the insulator according to the inclination angle of the surface of the insulator and the movement direction of the metal particle model;
mounting an insulator with a metal particle model and an electromagnet outside a GIS shell, enabling the central axis of the electromagnet to coincide with the central axis of the metal particle model, and determining the horizontal distance between the metal particle model and the electromagnet;
adjusting the current and direction of the electromagnet, and determining the current when the metal particle model moves towards the center of the insulator along the direction of the central axis;
determining magnetic induction coefficients of the electromagnet and the metal particle model according to the cross section area, the mass, the friction coefficient, the horizontal distance and the current;
placing a metal particle model at a target position in a closed GIS, applying voltage to the GIS, and determining the movement distance of the metal particle model, and the current and the movement speed applied by an electromagnet;
determining the movement distance of the metal particle model, the proportional relation between the current applied by the electromagnet and the movement speed, and determining the movement direction, the movement distance and the movement speed of the metal particle simulation movement and the applied current of the electromagnet according to the proportional relation;
and simulating the defect movement of the metal particles on the surface of the GIS insulator according to the movement direction, movement distance and movement speed of the metal particles during simulation movement and the applied current of the electromagnet.
2. The method of claim 1, wherein the metal particle model is made of a metal permanent magnet material.
3. The method of claim 1, wherein the magnetic induction coefficient is calculated by the formula:
k=(mμ×(1+5d 0 )/S)0.5×5000/I 0 ；
wherein k is the magnetic induction coefficient, m is the mass of the electronic particle model, μ is the friction coefficient, d 0 Is the horizontal distance between the metal particles and the electromagnet, I 0 The current sum S when the metal particles move is the cross-sectional area of the metal particle model.
4. The method of claim 1, wherein the proportional relationship is calculated as:
(kI/5000)2×S/(1+5(d 0 +D))-mμ) +((kI/5000)2×S/(1+5d 0 )-mμ)]×4.9×D=0.5×m×V 2
wherein k is the magnetic induction coefficient, I is the current applied by the electromagnet, S is the cross-sectional area of the metal particle model, d 0 The horizontal distance between the metal particles and the electromagnet is given, D is the moving distance of the metal particle model along the axis of the metal particle model, m is the mass of the electronic particle model, mu is the friction coefficient and V is the moving maximum speed.
5. The method of claim 1, wherein the time of the applied current of the electromagnet is calculated as:
T=2D/V；
wherein D is the movement distance, V is the maximum movement speed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110267038.5A CN113109673B (en) | 2021-03-10 | 2021-03-10 | Method for simulating movement of metal particle defects on surface of GIS insulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110267038.5A CN113109673B (en) | 2021-03-10 | 2021-03-10 | Method for simulating movement of metal particle defects on surface of GIS insulator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113109673A CN113109673A (en) | 2021-07-13 |
| CN113109673B true CN113109673B (en) | 2023-09-22 |
Family
ID=76711085
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110267038.5A Active CN113109673B (en) | 2021-03-10 | 2021-03-10 | Method for simulating movement of metal particle defects on surface of GIS insulator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113109673B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106199360A (en) * | 2016-08-31 | 2016-12-07 | 国家电网公司 | A kind of GIS disc insulator surface defect model |
| WO2018042690A1 (en) * | 2016-08-31 | 2018-03-08 | 株式会社東芝 | Gas-insulated switchgear and method for capturing metal impurities inside gas-insulated switchgear |
| CN207123592U (en) * | 2017-09-14 | 2018-03-20 | 国家电网公司 | A kind of particle discharge defect model suitable for GIS analogue means |
| CN108919064A (en) * | 2018-04-26 | 2018-11-30 | 中国电力科学研究院有限公司 | It is a kind of for reappearing the system and method for GIS disc insulator typical defect partial discharge test |
| CN209086371U (en) * | 2018-04-26 | 2019-07-09 | 中国电力科学研究院有限公司 | It is a kind of for reappearing the system of GIS disc insulator typical defect partial discharge test |
| CN112415344A (en) * | 2020-11-14 | 2021-02-26 | 国网电力科学研究院武汉南瑞有限责任公司 | GIS partial discharge comprehensive defect analogue means with adjustable |
-
2021
- 2021-03-10 CN CN202110267038.5A patent/CN113109673B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106199360A (en) * | 2016-08-31 | 2016-12-07 | 国家电网公司 | A kind of GIS disc insulator surface defect model |
| WO2018042690A1 (en) * | 2016-08-31 | 2018-03-08 | 株式会社東芝 | Gas-insulated switchgear and method for capturing metal impurities inside gas-insulated switchgear |
| CN207123592U (en) * | 2017-09-14 | 2018-03-20 | 国家电网公司 | A kind of particle discharge defect model suitable for GIS analogue means |
| CN108919064A (en) * | 2018-04-26 | 2018-11-30 | 中国电力科学研究院有限公司 | It is a kind of for reappearing the system and method for GIS disc insulator typical defect partial discharge test |
| CN209086371U (en) * | 2018-04-26 | 2019-07-09 | 中国电力科学研究院有限公司 | It is a kind of for reappearing the system of GIS disc insulator typical defect partial discharge test |
| CN112415344A (en) * | 2020-11-14 | 2021-02-26 | 国网电力科学研究院武汉南瑞有限责任公司 | GIS partial discharge comprehensive defect analogue means with adjustable |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113109673A (en) | 2021-07-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102841129B (en) | Gravitational field simulation device and method for geotechnical engineering model test | |
| Schindl | Space charge | |
| Shipman | Experimental study of DC vacuum breakdown and application to high-gradient accelerating structures for CLIC | |
| Huege | Theory and simulations of air shower radio emission | |
| US10871188B2 (en) | Control method and control device for magnetic bearing | |
| CN113109673B (en) | Method for simulating movement of metal particle defects on surface of GIS insulator | |
| JP2015111401A (en) | Analysis device | |
| Ge et al. | Movement behavior and partial discharge of the single metallic particle in GIS at operated voltage | |
| Wu et al. | Simulation and analysis on motion behavior of metal particles in AC GIL | |
| CN104215504B (en) | Charging operation composite material electric pole vibration fatigue test device | |
| Cao et al. | SF6 decomposition components under different metallic free‐conducting wire‐type particles in positive DC partial discharge | |
| CN106529100B (en) | One kind being based on finite element analysis solenoid superconducting magnet coil magnetic field emulation mode | |
| Wu et al. | Towards the surface flashover in DC GIL/GIS: the electric field distribution and the surface charge accumulation | |
| CN115290281A (en) | Superconducting magnet testing method and system and processor assembly | |
| CN109214101B (en) | High-voltage switch arc simulation method based on logic judgment | |
| Roger et al. | A method to reduce partial discharges in motor windings fed by PWM inverter | |
| Li et al. | A novel particle trap in compressed air insulated transmission line | |
| Zhu et al. | Electromagnetic mechanism property analysis for spacecraft despinning | |
| CN112147430A (en) | Vibration fatigue test device and method for composite insulating cross arm of distribution network | |
| Anggraita et al. | Beam tracking simulation in the central region of a 13 MeV PET cyclotron | |
| Mahmoodi et al. | Effect of accumulated surface charges on DC flashover of SiR insulators under pollution and aging conditions | |
| CN117589976B (en) | Method and device for measuring moisture of silicone rubber of cable terminal | |
| Cao et al. | Design and simulation of Voice Coil Motor for the micro-electric load simulator | |
| SU1688291A1 (en) | Magnetizing device | |
| CN116718849A (en) | Material static electrification testing device and method in plasma environment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |