Metal particles,difficult to be eliminated in gas-insulated metal-enclosed switchgear(GIS),can cause GIS discharge and breakdown between electrodes,or flashover on the insulator surface.It influences the development o...Metal particles,difficult to be eliminated in gas-insulated metal-enclosed switchgear(GIS),can cause GIS discharge and breakdown between electrodes,or flashover on the insulator surface.It influences the development of ultra-high voltage(UHV)projects.Therefore,the work optimised the model of metal particle movement under AC voltage,studying the metal particle movement and distribution characteristics between ball-plane electrodes through experiment and simulation.Under AC voltage,the particle jumps on a small scale on the plane surface.With the increase of voltage,the jump amplitude increases.However,the collision frequency decreases until the particle collides with the ball electrode.When the initial phase angle of power changes,the particle-moving pattern is symmetrical in the angle ranging from 0 to 180°,and from 180 to 360°.The collision frequency changes slightly with the increase of jump amplitude when the angel ranges from 0 to 120°.展开更多
The large leakage current of the roof arrester caused by the high‐frequency resonant overvoltage on the high‐speed train occurs intermittently,which will cause the arrester to overheat locally.In this work,the overh...The large leakage current of the roof arrester caused by the high‐frequency resonant overvoltage on the high‐speed train occurs intermittently,which will cause the arrester to overheat locally.In this work,the overheating issue of the arrester under Ultra Harmonics Overvoltage is studied.Then,the relationship between the active power and the voltage(including amplitude and frequency)of the arrester is investigated,and the impact mechanism of the harmonic voltage on the overheating fault of the arrester is analysed based on experiments in this work.It is found that the total leakage current of the arrester is proportional to the amplitude and frequency of the applied voltage.The internal resistance of the arrester is independent of the amplitude of the voltage,but it will decrease with the increase of the frequency.The main reason that leads to thermal breakdown of the arrester valve under high‐frequency harmonic voltage is the heating power elevation of the arrester valve.The research study can provide theoretical basis and data support for the design,type selection and monitoring of the high‐speed train roof arrester.展开更多
基金the Fundamental Research Funds for the Central Universities(E18JB00070,E17JB00020)Science and Technology Foundation of State Grid Corporation of China(B342GY160015).
文摘Metal particles,difficult to be eliminated in gas-insulated metal-enclosed switchgear(GIS),can cause GIS discharge and breakdown between electrodes,or flashover on the insulator surface.It influences the development of ultra-high voltage(UHV)projects.Therefore,the work optimised the model of metal particle movement under AC voltage,studying the metal particle movement and distribution characteristics between ball-plane electrodes through experiment and simulation.Under AC voltage,the particle jumps on a small scale on the plane surface.With the increase of voltage,the jump amplitude increases.However,the collision frequency decreases until the particle collides with the ball electrode.When the initial phase angle of power changes,the particle-moving pattern is symmetrical in the angle ranging from 0 to 180°,and from 180 to 360°.The collision frequency changes slightly with the increase of jump amplitude when the angel ranges from 0 to 120°.
基金supported by the Fundamental Research Funds for the Central Universities(2021JBM025)the National Natural Science Foundation of China(51907003).
文摘The large leakage current of the roof arrester caused by the high‐frequency resonant overvoltage on the high‐speed train occurs intermittently,which will cause the arrester to overheat locally.In this work,the overheating issue of the arrester under Ultra Harmonics Overvoltage is studied.Then,the relationship between the active power and the voltage(including amplitude and frequency)of the arrester is investigated,and the impact mechanism of the harmonic voltage on the overheating fault of the arrester is analysed based on experiments in this work.It is found that the total leakage current of the arrester is proportional to the amplitude and frequency of the applied voltage.The internal resistance of the arrester is independent of the amplitude of the voltage,but it will decrease with the increase of the frequency.The main reason that leads to thermal breakdown of the arrester valve under high‐frequency harmonic voltage is the heating power elevation of the arrester valve.The research study can provide theoretical basis and data support for the design,type selection and monitoring of the high‐speed train roof arrester.
