摘要
在户外对变压器进行噪声测试时,测试结果往往容易受到外界环境噪声的影响。由于环境噪声类型较为复杂,且其产生与持续时间具有不确定性和非平稳性,大部分的测量仪器无法对其进行有效的处理。因此,为了提高变压器噪声测量的准确性,需要对采集到的原始噪声信号进行预处理。文中提出了一种基于小波分解与谱减法相结合的变压器噪声预处理方法,采用小波包分析算法将变压器声信号时频分解,对分解后的带噪频段小波包信号进行谱减法语音处理。理论分析结果与变电站实测带噪信号分析结果表明,该方法能够有效抑制变电站环境噪声对变压器噪声测量结果的干扰。所提出的方法对于输变电工程噪声检测以及基于噪声检测的变压器运行状态评价具有参考意义。
To suppress the effect of ambient noise on outdoor transformer noise measurement and improve the measurement accuracy,a method for preprocessing the collected noise signal based on the wavelet packet decomposition and spectral subtraction algorithm is proposed. The collected noise signal is decomposed into several bands with different frequency range by means of the wavelet packet analysis. Then,the signals of these bands are further processed by spectral subtraction method.Both theoretical analysis and measured noise signal analysis show that the proposed method is effective in restraining the effect of ambient noise on the transformer noise measurement. The proposed method can be referenced for the noise measurement of power transmission and transformation projects,and for the operation state assessment of transformer based on noise measurement.
作者
彭鹏
吴晓文
陈炜
罗潇
卢铃
曹浩
黄韬
胡胜
PENG Peng;WU Xiaowen;CHEN Wei;LUO Xiao;LU Ling;CAO Hao;HUANG Tao;HU Sheng(State Grid Shanghai Municipal Electric Power Company,Shanghai 200025,China;State Grid Hunan Electric Power Corporation Research Institute,Changsha 410007,China)
出处
《高压电器》
CAS
CSCD
北大核心
2019年第11期177-183,共7页
High Voltage Apparatus
基金
上海市科学技术委员会(18511109402)
国网上海市电力公司科技项目(520970170005,52097018000A)
国家自然科学基金(51877168)~~
关键词
变压器
背景噪声
小波包
谱减法
transformer
ambient noise
wavelet packet
spectral subtraction
