不对称三相同壳母线快速瞬变过程相电压的测量方法

叙述了封闭式组合电器在不对称三相同壳母线结构下，快速瞬变过程三相电压测量的基本原理。在测量中需要3个电容传感器，每个传感器同时受A，B，C三相电压的电场耦合。三相电压与3个电容传感器输出电压之间的关系，可以用一个关系因子矩阵来表达，该矩阵是一个常数矩阵与电场耦合系数矩阵的乘积。通过分析电场耦合系数矩阵，提出了主导电场耦合系数的概念，并得到了它的近似解析表达式。根据电场耦合系数函数的特性，应分别将3个电容传感器安置于A，B，C三相导体在外壳上的近距点处，最后，给出了在一个不对称三相同壳母线模型上的快速瞬变过程三相电压实验测量结果。

Phase Voltage Measurement on Very Fast Transients in Non-Symmetrical Three-Phase Enclosed Gas Insulated Substation

The method to measure the phase voltage on very fast transients in a non symmetrical three phase enclosed gas insulated substation is described. In order to measure three phases voltage, three capacitive sensors are needed and each capacitive sensor is coupled with the electric field of (A,B,and C) three phases voltage. The linear relation between the output of three capacitive sensors and the three phases voltage is established by a factorial matrix, which is equal to the product of a constant matrix and the electric coupling coefficient matrix. As a result of the analysis of the electric coupling coefficient matrix, the dominant electric coupling coefficients are named, which have an approximate analytic expression. Furthermore, according to characteristic of the electric coupling coefficient functions, three capacitive sensors are fixed at the shortest points of phase A, B, and C. Finally, the curves of three phases voltage on very fast transients in a non symmetrical three phase enclosed gas insulated substation bus model are given and discussed.