A simple procedure to estimate series capacitance of a uniform transformer winding from its measured frequency response analysis (FRA) and shunt capacitance is presented. Unlike previously published approaches, this method does not involve any cumbersome and time-consuming curve-fitting nor running optimisation/search algorithms, and neither does it require data of winding geometry. The procedure relies on a property that is observable in the impedance function of a lossless winding, viz., the ratio of the product of squares of open circuit natural frequencies to the product of squares of short circuit natural frequencies bears a special relation to impedance function coefficients. Its feasibility was initially verified by simulation, and then by experiments on small-sized continuous-disk and interleaved-disc windings, followed by a large-sized 33 kV, 3.5 MVA continuous-disc winding, and finally on a 315 kVA 11/13.8 kV transformer. After measuring FRA, the process involves just finding roots of a polynomial, from which the initial impulse voltage distribution constant and series capacitance can directly be determined. Given these attractive features, authors believe that this method is implementable on existing FRA instruments, so that, along with routinely measured FRA, these two important constants of a winding can be displayed.

提出了一种从均匀变压器绕组的实测频率响应分析（FRA）和并联电容估算串联电容的简单程序。与以前发布的方法不同，此方法不涉及任何麻烦且费时的曲线拟合，也不需要运行优化/搜索算法，也不需要绕组几何数据。该程序依赖于在无损绕组的阻抗函数中可观察到的特性，即，开路固有频率的平方乘积与短路固有频率的平方乘积之比与阻抗函数有特殊关系。系数。最初通过仿真验证了其可行性，然后通过小型连续盘和交错盘绕组的实验进行了验证，然后是大型33 kV，3.5 MVA连续盘绕，最后是315 kVA 11 / 13.8 kV变压器。在测量FRA之后，该过程仅涉及找到多项式的根，从中可以直接确定初始脉冲电压分布常数和串联电容。鉴于这些吸引人的特征，作者认为该方法可在现有的FRA仪器上实施，因此，与常规测量的FRA一起，可以显示绕组的这两个重要常数。