摘要
变压器局部放电超声波定位中,首要任务是对超声波信号的提取,其准确性将直接影响到定位的实现.EMD方法可以将非线性、非平稳信号分解为不同频率成分的内禀模态函数,从而提取超声波信号.以山西省高压电气设备局部放电定位项目为背景,详细分析了EMD方法的原理、实现过程,并用实例测试仿真,验证了该方法的有效性与准确性.
In the ultrasonic locating of transformer partial discharge, the most important is to extract the ultrasonic signals. Its precision directly affects the accuracy of the locating results. The empirical mode decomposition （EMD） method can decompose the nonlinear and non -stationary signals to intrinsic mode functions （IMF） with different frequencies, then the ultrasonic signals are extracted. Based on the project of high voltage instruments, the paper describes the EMD method algorithm, analyzes the de- tailed processing, and the simulated testing has showed the validity and accuracy of the method.
出处
《西安文理学院学报（自然科学版）》
2009年第4期48-50,共3页
Journal of Xi’an University(Natural Science Edition)
基金
西安市科技计划项目(YF07041)
