CAJ | 학술논문

在综述现有断路器机械故障振动信号研究方法的基础上，提出了一种经验模态分解（ EMD）和分形理论相结合的方法用于提取低压断路器振动信号的特征量，并以典型的三相合闸不同期性低压断路器故障为对象，研究了EMD结合分形维数的故障振动信号特征分析，且给出以分形维数均方根作为故障特征量的实验仿真数据结果。首先，利用EMD方法对低压断路器的振动信号进行分解，得到若干个本征模态函数（ IMF）；其次，对振动信号以及各IMF分量求分形维数及其均方根，作为低压断路器振动信号的特征量。通过对低压断路器三相合闸不同期性模拟故障振动信号处理，对比其不同状态下的分形维数及其均方根的变化规律，表明该方法不仅可作为低压断路器三相同期性故障诊断的判据，且可应用于断路器其他各类机械故障的振动信号特征的提取分析。
재종술현유단로기궤계고장진동신호연구방법적기출상，제출료일충경험모태분해（ EMD）화분형이론상결합적방법용우제취저압단로기진동신호적특정량，병이전형적삼상합갑불동기성저압단로기고장위대상，연구료EMD결합분형유수적고장진동신호특정분석，차급출이분형유수균방근작위고장특정량적실험방진수거결과。수선，이용EMD방법대저압단로기적진동신호진행분해，득도약간개본정모태함수（ IMF）；기차，대진동신호이급각IMF분량구분형유수급기균방근，작위저압단로기진동신호적특정량。통과대저압단로기삼상합갑불동기성모의고장진동신호처리，대비기불동상태하적분형유수급기균방근적변화규률，표명해방법불부가작위저압단로기삼상동기성고장진단적판거，차가응용우단로기기타각류궤계고장적진동신호특정적제취분석。
By reviewing the existing methods for mechanical fault vibration signal of circuit breaker, a method that combines EMD ( Empirical Mode Decomposition) with fractal theory is presented for extracting feature value from vibration signal of low voltage circuit breaker. Based on the typical object of low voltage circuit breaker for three?phases switching asynchronism, not only the fault vibration signal feature is analyzed by the method of EMD com?bined with fractal dimension, also the fault feature value of experimental and simulation data is provided with the root?mean?square of fractal dimension. Firstly, EMD is used to decompose the vibration signal into a number of in?trinsic mode functions ( IMF) . Secondly, the root?mean?square of fractal dimension is calculated for the vibration signal and it’ s every order IMF as the vibration signal feature value. Finally, the changing rule for the root?mean?square of fractal dimension to simulated failure vibration signals is contrastively analyzed under different states. As a result, the method is effective as fault diagnosis criteria for three?phases switching asynchronous of low voltage cir?cuit breaker, and is effective to extract other kinds of mechanic fault vibration signals for circuit breaker.