摘要
自由金属微粒是影响气体绝缘组合电器(GIS)绝缘可靠性的主要威胁之一,常具有潜伏性和随机性,而GIS振动可激励微粒起跳并诱发绝缘击穿,但相关研究鲜有报道。该文建立了特高压GIS中工频电压叠加正弦振动条件下自由金属微粒的荷电、受力和运动仿真计算模型,研究了不同外施电压和振动参数对微粒运动特性的影响规律,并获得不同条件下微粒的超声飞行时间谱图。研究结果表明:初始时刻,在壳体加速度作用下,微粒起跳场强随振幅的增加逐渐降低,微粒半径对起跳场强影响随振幅的增加逐渐减小。微粒运动过程中,相邻两次碰撞间最大飞行高度与碰撞瞬间恢复速度及电压相位有关,且与微粒飞行时间呈正相关。与仅施加工频电压相比,外施振动激励条件下,微粒飞行时间图谱在电压幅值较低时即呈现明显的三角脉冲,且微粒飞行时间图谱呈山峰状,与带状飞行图谱相比具有明显差异,具有较高的识别性。
Free metal particles are one of the main threats to the reliability of gas insulated metalenclosed 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.
作者
李杰
李晓昂
吕玉芳
吴治诚
赵科
张乔根
Li Jie;Li Xiaoang;LüYufang;Wu Zhicheng;Zhao Ke;Zhang Qiaogen(State Key Laboratory of Electrical Insulation and Power Equipment Xi’an Jiaotong University,Xi’an 710049 China;State Grid Jiangsu Electric Power Research Institute,Nanjing 210000 China)
出处
《电工技术学报》
EI
CSCD
北大核心
2021年第21期4580-4589,4597,共11页
Transactions of China Electrotechnical Society
基金
国家电网有限公司科技项目资助(5500-202018080A-0-0-00)。
关键词
气体绝缘组合电器(GIS)
自由金属微粒
工频电压
正弦振动
起跳场强
超声飞行图谱
Gas insulated metal-enclosed switchgear(GIS)
free metal particles
power frequency voltage
sinusoidal vibration
take-off electric field strength
acoustic flight pattern
