【摘要】 在GIS三相同壳母线VFT电压测量中,每个传感器同时受A、B、C三相电压的电场耦合,必须通过解耦,才能得到每相的VFT电压。利用主导电场耦合系数,就可以根据三个电容传感器的输出电压,直接得到具有足够精度的三相VFT电压波。通过对一个与三相同壳母线具有相同几何参数的偏心圆的电场分析,可以得到主导电场耦合系数的近似解析表达式。该文着重分析了主导电场耦合系数与三相同壳母线GIS几何参数之间的关系,并得到了主导电场耦合系数的工程化计算方法。这对GIS三相同壳母 线模型的设计,以及在实验现场环境下定量分析GISVFT电压波特性非常重要。更多还原

【Abstract】 In order to measure the VFT phase voltage in three-phase enclosed GIS, 3 capacitive sensors are needed. Each capacitive sensor is coupled with the electric field of (A、B and C)three phase voltages. The elements at diagonal of electric coupling coefficient matrix are much larger than the other ones, which are called the dominant electric coupling coefficients and can be calculated approximately by an analytic expression with enough accuracy. When 3 capacitive sensors are located at the 憇hortest point?of phase A, B, and C, respectively, each phase VFT voltage (VA or VB or VC) can be directly obtained by the dominant electric coupling coefficients. This paper analyses the relation between the dominant electric coupling coefficients and the geometrical parameters of the three-phase enclosed GIS, and a simplified method to calculate the dominant electric coupling coefficients is gained which is especially suitable to the experimental site.更多还原