Comparativeness of loss-of-excitation protection setting principle;

Application and setting principle of ring-close switch protection for 110kV electromagnetic ring net;

Adopting special protection setting principle for line switch in small generating set side is proposed,thus it can avoid unnecessary loss of power supply because the reclosure in small power side cannot calibrate synchronization to cause part of grid losses power during instantaneous fault in the parallel-operated lines with super-power and small generating set.

Research of setting method of ground distance zone-Ⅲ protection for 110kV transmission line;

Design principle,constitute,principle of adjust and control method of the device were introduced.

Research purposes: The discussion on karst ground collapse in the engineering construction of the high speed railway is carried out to find out a relatively economic,rational and reliable karst collapse regulation principle.

This paper presents the Bantan s regulation principle which is composed of loosenbombing and regulation by means of the shoal property analysis.

Through comparatively integrated prototype measured data, analysed the water sand condition and variation character of Bantan beach located in the backwater effect region of reservoir head after completion of the Xijin hydropower station on Yujiang, the cause of beach formation of Bantan and its principle of regulation were explored also.