三次滤波器中三次谐波电流的流向及滤波效果  

Flow Direction and Filtering Efficiency of Triple-Frequency Harmonic Current in Triple-Frequency Harmonic Filter

作　　者：夏华 

机构地区：[1]马鞍山钢铁设计研究院,马鞍山市243005

出　　处：《冶金动力》1994年第5期1-4,共4页Metallurgical Power

摘　　要：由于三次谐波电流Ｉ３具有零序性质，即а、ｂ、с三相同相位，而三次滤波器Ｈ３一般采用不接地星形结线，且三相设备参数一致，可看成三相平衡电路。于是不少人对Ｈ３中Ｉ３的流通产生疑问；另外，在对Ｈ３进行在线测量时，往往发现Ｉ３被“放大”，由此而对Ｈ３的滤波效果或设计的正确性产生争议。一种常用的解释是吸收了系统中的Ｉ３，本文用对称分量法分析Ｈ３中Ｉ３的流向及滤波效果，提出另一种解释，供滤波装置设计和考核时参考。Triple-frequency harmonic current I3 has zero-sequence character,i. e. a, b,c phases have same phases, while triple- frequency harmonic filter H3 usually use sung rounded star connection. Parameters of the three-phase machine are the same. It can be considered as three-phase balancing circuit. According to the above mentioned some people doubted about circulation of I3 in H3. In addition, it was found that I3 was 'enlarged' as H3 was measured in-situ. Therefore , there are disputes about filtering or design correctness of H3. An ordinary explaination is that I3 in system was adsorbed. This paper analyze flow di- rection and filtering efficiency of I3 in H3 with symmetrical component method. About this the paper proposed another explaination. The explaination may be valuable for design and in- spection of filters.

关 键 词：三次谐波电流 滤波器 效果 

分 类 号：TN713[电子电信—电路与系统]