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一、引言三相电流不平衡时负序电流的计算问题,在理论上早已解决。由于计算比较麻烦,因此,国内外一些著作给出了各种近似计算法和图解法[文献1～6]。诚然,这些方法在不同程度上简化了计算过程。但是,在某些场合,例如根据发电机不平衡的三相电流计算负序电流值以确定发电机的允许运行时间,则仍然存在着一些困难问题。因此,进一步探讨这个问题是有现实意义的。本文的目的在于:1.给出一个在特定情况下用以计算负序电流的近似公式;2.从贯彻部颁《关于补充规定同期发电机和同期调相机不平衡电流允许值的技术通
I. INTRODUCTION The calculation of negative sequence current when the three-phase current is unbalanced has long been theoretically solved. Due to the calculation is too much trouble, therefore, some domestic and foreign books give a variety of approximate calculation and graphic method [References 1 ~ 6]. Admittedly, these methods simplify the calculation to varying degrees. However, in some cases, such as calculating the negative sequence current value based on unbalanced three-phase current of the generator to determine the allowable running time of the generator, there are still some difficult problems. Therefore, to further explore this issue is of practical significance. The purpose of this paper is to: 1. Give an approximate formula for calculating the negative sequence current under certain conditions; 2. From the implementation of the Ministry of "on the provisions of the same period generator and synchronous camera unbalance current allowable value of technology