高压电器2018，Vol.54Issue(8)：133-138,146,7.DOI:10.13296/j.1001-1609.hva.2018.08.021
城市变电站主要设备噪声特性与直流偏磁分析
Analysis of Noise Characteristics and DC Bias of Major Equipment in Urban Substation
摘要
Abstract
In order to master the noise characteristics of main equipment in urban substation, the sound source position, noise level and spectrum characteristics of main equipment in 110 kV～500 kV substation are tested by acoustic camera. The results of noise spectrum measurement are further analyzed. The results show that the noise source of the equipment is the main transformer itself, the cooling fan and the tank surface. The noise energy is mainly concentrated in the frequency range of 100～1 000 Hz and the proportion of the fundamental frequency of the transformer with different capacity is different. In addition, in the measurement of the noise of the main equipment of 500 kV substation, it is found that a large number of high harmonics appear in the spectrum due to the DC bias phenomenon. In this paper, the detection method of the degree of DC bias is discussed by using wavelet analysis in terms of energy, which provides a reference for substation noise control and DC bias suppression.关键词
主变噪声/声源定位/频谱/直流偏磁/小波Key words
main transformer noise/sound source location/spectrum/DC bias/wavelet引用本文复制引用
寇晓适,钱诗林,蔡永平,娄建勇..城市变电站主要设备噪声特性与直流偏磁分析[J].高压电器,2018,54(8):133-138,146,7.基金项目
国网河南省电力公司重点科技项目 (5217A0170019) （5217A0170019）
国家自然科学基金 (50807042).Project Supported by Key Technical Project of State Grid Henan Electric Power Company(5217A0170019),National Natural Science Foundation of China(50807042). （50807042）
