Motion Characteristics of Free Metal Particles in GIS under Sinusoidal Vibration
Li Jie1, Li Xiaoang1, Lü Yufang1, Wu Zhicheng1, Zhao Ke2, Zhang Qiaogen1
1. State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong University Xi'an 710049 China; 2. State Grid Jiangsu Electric Power Research Institute Nanjing 210000 China
Abstract：Free metal particles are one of the main threats to the reliability of gas insulated metal-enclosed switchgear (GIS) insulation. They have the character of latent and random. The vibration of GIS can excite particles to taken off and induced insulation breakdown, but related research was rarely reported. This paper established a simulation calculation model for the charging, force, and motion of free metal particles under the power frequency voltage superimposed sinusoidal vibration in UHV GIS. Researching the influence of voltage and vibration parameters on the particle motion characteristics and obtained particles' acoustic flight patterns under different conditions. The results show that under the vibration of the shell acceleration at the initial moment. The take-off electric field strength of particles gradually decreases with the increase of the amplitude. The effect of the particle radius on the take-off electric field strength gradually decreases with the amplitude's growth. During the movement, the maximum flight height of particles between two adjacent collisions is related to the collision recovery speed and the instantaneous voltage phase of the collision. And the maximum flight height is positively related to particle flight time. Under the power frequency voltage superimposed sinusoidal vibration, the acoustic flight pattern shows an evident triangular pulse with a higher recognition when the voltage amplitude is low. The acoustic flight pattern is mountain-shaped, significantly different from the band flight pattern under the power frequency voltage application.
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