在分析差动平衡法和极性鉴别法抗电磁干扰性能的基础上，提出了定向耦合差动平衡法；论述了该方法的基本原理和特点通过模拟和带电试验，分析了该系统的线性度和抗干扰能力，从而证明了这种方法的有效性及应用前景。

在介绍小波包变换算法的基础上，将小波包变换用于白噪声干扰下的气体绝缘组合电器（GIS）局部放电信号提取。对模拟的局部放电信号进行了小波包分解与重构的计算机仿真研究，分析了不同的局部放电波形、噪声水平及采样率对去噪结果的影响，最后对GIS内置传感器实测波形进行了小波包变换去噪。

根据人工气候室内的试验结果，分析了覆冰量、覆冰水电导率及覆冰状态对10kV合成绝缘子交流冰闪电压的影响，提出了合成绝缘子的冰闪过程。研究结果表明：由于冰凌桥接裙间空气间隙，短接爬电路径，其冰闪电压将明显降低；在覆冰状态下，间歇性局部电弧烧伤表面，从而使其憎水性难以完全恢复性丧失。这是合成绝缘子冰闪电压降低的主要原因之一。

Electroporation (i.e., reversible electrical breakdown) has been used for biomedicine such as electroporation therapy, transdermal drug delivery, cellular drug carrier systems, and gene transfer therapy. However, little research on the biological effect of irreversible electrical breakdown has been published. In this paper, the killing and inhibiting effects of pulsed electric field, whose rising edge is 100ns level (we call it steep pulsed electric field, SPEF), to target cancer cell and solid tumor were successfully observed. The SPEF consists of two parts: the rising process containing ample high-frequency components, and the falling process containing lots of low-frequency components. Cell exposed to the pulse presented multiple changes: destructed membrane, swollen nucleus, disintegrated karyotheca, and cavitated, swollen mitochondria in histological and ultrastructure observations. SPEF blocked cell transition from G0/G1 phase to S+G2/M phase in flow cytometry analysis, and tumor growth retardation was observed in tumor-bearing mice. These experimental results show SPEF have a certain function to generate irreversible electrical breakdown in tumor cells, and might provide a new promising therapeutic approach for tumor treatment.