新型微机反时限过流保护曲线特性及算法研究

传统反时限过流特性曲线计算微机反时限保护延时时,存在与定时限保护的配合以及计算延时不准等缺陷。该文提出了对反时限特性曲线进行分段计算处理的方法,改进了与定时限的配合,提高了时限的精度。然后针对计算比较困难的一般反时限曲线,介绍了分区查表和泰勒展开法计算时延累加量的算法。

Research on curve characteristics and algorithms of new digital inverse-time overcurrent protection

To calculate the time delay in inverse-time overcurrent protection, the traditional inverse-time overcurrent curve has disadvantages in cooperating with time delay protection and precisely calculating the progressive time. A new inverse-time overcurrent curve is introduced,which is divided into several sections to calculate each curve respectively. As a result, it is improved in cooperating with time delay protection and progressive time precision. To resolve the difficulty of progressive time calculating in normal inverse-time overcurrent curve, two algorithms of zonal table-lookup and Taylor expansion are put forward.