结合中值滤波的介损数字化算法

Dielectric Loss Digital Algorithm Combined with Median Filter

针对介损测量用的电压和泄漏电流信号存在脉冲干扰影响介损测量准确性的问题,提出了使用中值滤波算法对信号进行滤波,然后对滤波后信号使用数字化算法计算介损的算法。针对普通中值滤波算法使信号长度减少的情况,提出了一种不改变滤波后信号长度的中值滤波算法。对含脉冲噪声信号的滤波和滤波后信号的计算结果表明,提出的算法能有效抑制信号中的脉冲噪声,滤波后信号计算所得介损的精确度均要高于滤波前。同时,使用改进中值滤波算法避免了因为信号长度变短给介损测量造成误差的可能性。

Aimed at the problem of impulse interference of voltage and leakage current influence the dielectric loss measuring accuracy, an algorithm for dielectric loss measuring was proposed. The algorithm firstly used median filter algorithm to filter impulse interference signal, then the digital algorithm without changing the signal length was proposed to calculate dielectric loss according to the filtered signal. Filter and calculation result of noisy signal indicates that the proposed algorithm not only can suppress impulse interference effectively, but also can improve accuracy of dielectric loss measurement. In the meantime, possibility of dielectric loss measurement error caused by signal length change is avoided by modified median filter algorithm.