摘要
一般认为,干式空心电抗器的噪声频谱为谐波电流各频率之间的差频、合频及每个谐波的二倍频,然后实际测试得到的噪声频谱与目前理论分析的结果并不一致。文中以一台小型的干式空心电抗器为例,对噪声测量过程中的干扰现象进行了研究,并结合电磁感应理论对干扰的来源进行了解释和分析。研究结果表明,干式空心电抗器在加载单频的激励电流时,利用传声器测得的噪声频谱中除了电流频率二倍频的噪声分量外,还会出现多个电流整数倍频率的干扰分量。其中单倍频的干扰分量来源于磁场对传声器的影响,其幅值和加载电流成正比;多倍频的干扰分量来源于传声器薄膜振动和磁场的相互耦合,其幅值受磁场和声压共同影响。
It is generally recognized that the noise spectrum of the dry-type air-core reactor is the difference frequency and combined frequency between each frequency of harmonic current as well as double frequency of each harmonic,and the noise spectrum obtained by actual measurement and the result of present theory analysis is not in agreement. In this paper, a set of small dry type air-core reactor is taken as an example, the interference phenomenon in the process of noise measurement is studied and the source of the interference is explained and analyzed in combination with electromagnetic induction theory. The study results show that in case of loading single-frequency excitation current for the dry-type air-core reactor,the multiple interference components with integer frequency of current also occurs in addition to the noise component of current frequency doubled in the noise spectrum measured by the microphone. The single-frequency interference component comes from the influence of the magnetic field on the microphone and its amplitude is proportional to the loading current. While, the multi-frequency interference components come from the mutual coupling between the vibration of the microphone membrane and the magnetic field,and their amplitudes are affected by both the magnetic field and the sound pressure.
作者
陈硕
田杰
梁兆杰
树婷
高璐
CHEN Shuo;TIAN Jie;LIANG Zhaojie;SHU Ting;GAO Lu(Shenzhen Power Supply Co.,Ltd.,Guangzhou Shenzhen 518000,China;State Key Laboratory of Electrical Insulation and Power Equipment,Xi’an Jiaotong University,Xi’an 710049,China)
出处
《高压电器》
CAS
CSCD
北大核心
2023年第2期147-152,共6页
High Voltage Apparatus
基金
南方电网科技项目(0914002019030103YJZL00042)。
