To resolve the difficulty of progressive time calculating in normal inverse-timeovercurrent curve, two algorithms of zonal table-lookup and Taylor expansion are put forward.
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。
2
The improved PSO algorithm is tested in two models, to show the effects of improvement and its ability in solving the inverse timeovercurrent relay coordination problem when DG units are connected.