直流绝缘子串电压分布测量方法及其分布特性

提出了一种新型测量直流系统绝缘子串电压分布的静电计式仪器和测量方法．仪器采用振动式探头，把绝缘子的直流电压变成交流信号，处理后，语音直接报出绝缘子的电压值．通过在含有５ 片绝缘子的绝缘子串上的各种试验，研究了绝缘子串电压分布的影响因素及电压分布特征．影响直流系统绝缘子串电压分布的因素与交流系统不同，污秽、空气湿度和电压极性对分布电压都有影响．电压分布是一个动态的过程，随各种因素的变化而变化，绝缘子电压分布有很大的分散性．干燥情况下，直流系统绝缘子串电压分布更加不均匀，导线端绝缘子电压更高．

Novel Method for Measuring Voltage Distribution of HVDC Insulator String and Its Distribution Characteristics

A novel method on the basis of electro static voltmeter theory and a specially designed instrument were introduced. The instrument is made up of an oscillating detector, which converts the distributed voltage of an insulator to ac signal for further treatment, a singlechip microcomputer unit and a speaker system. Characteristics of voltage distribution and some factors influencing on it were also studied. The results show that the contamination, air conditions, surrounding objects and the applied voltage polarity have impact on the voltage distribution and are different from those factors on AC string. The distributed voltage which is a dynamic process varies with the different factors and its value has a great range.It is highly non uniform with the line end insulators bearing a higher voltage than that in an ac insulator string on dry condition.