To decrease the reordering computational complexity,spectral band grouping algorithm is introduced to divide hyperspectral images into several groups according to the correlation coefficient between each adjacent bands,then each group is reordered by using the best reverse reordering algorithm based on the performance analysis of several reordering algorithms.

In order to limit tap operating times of transformer in a period of time, a strategy for substation voltage & reactive power control based on combined sections of active, reactive load and system voltage is proposed in this paper.

Transfer function of transformer s sectional winding can be used for the evaluation and localization of partial discharges(PD),but the estimation of the winding parameters is difficult when not knowing the sectional winding voltages.