使用粉尘图法测量交流电压下GIS绝缘表面电场电荷分布的影响因素研究

Research on the Influence Factor of the Dust Figure Used for the Measurement of the Surface Charge and Electric Field Distribution of GIS Insulator Under AC Voltage

粉尘图法是一种常用的绝缘表面电场电荷分布的测量方法,但其在应用时仍然存在一些局限性,且目前对于影响其使用效果的因素的研究也存在不足。本论文在实际的GIS支柱绝缘子模型上对粉尘图法的各项可能的影响因素进行了研究,并针对离线情况下使用粉尘图法时存在的不足,提出了在带电情况下使用粉尘图法测量绝缘表面电场电荷分布的方法。研究结果表明,交流电压下粉尘图法的作用效果受到粉尘种类、外施电压大小、绝缘气体种类和压强等多种因素的影响,在使用时必须严格控制实验变量;在带电情况下使用粉尘图法能够有效地反映绝缘表面的电场分布情况,具有重要的研究和应用价值。

The dust figure is widely used in measurement of the distribution of insulator surface charge and electric field.However,some disadvantages can be found on this method which limit its application,and more research should be done on the influence factor when it is applied.In this paper,several factors which may affect the results of the dust figure is investigated on the actual GIS post insulator,and the new method using the dust figure to measure the distribution of the insulator surface charge and electric field while the AC voltage is being applied is proposed,aimed on the disadvantages of the dust figure when used without the AC voltage being applied.The results indicate that the effect of the dust figure is influenced by several factors,including the sort of the dust,the intensity of the applied voltage,and the sort and pressure of the insulating gas.Thus,the experiment condition must be strictly controlled when it is applied.Besides,it is found that using the dust figure while the AC voltage is being applied can effectively show the distribution of the electric field on insulator surface,leading to its strong investigation and application value.