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.

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。

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As a result, the limit surface of the polygonal mesh containing the symmetric zonal meshes is the subdivision surface satisfying the curve interpolation constrains.

因此，含有这种对称网格带的多面体网格的细分极限曲面即为满足曲线插值约束的细分曲面。

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